Gripone Aziendale, Via Euridia Bergianti 10B, Medicina (2026)

22/07/2026

"Stealth" Integration in Restomod Engineering: Thermodynamic Validation and Reliability with Gubelog-03

Introduction: The Aesthetic Paradox and the Engineering Challenge
The Restomod market (the extreme restoration and modernization of classic cars) has transformed vintage motoring into an ultra-high-end engineering sector. Vehicles that often exceed €200,000 in value fuse the aesthetics of the '60s or '70s with modern powertrains capable of delivering three or four times the power of the original chassis.

This generates a massive engineering discrepancy: inserting a modern V8 engine (such as an LS3 or a Coyote) or a high-compression 6-cylinder boxer into engine bays originally designed to dissipate only a fraction of today's thermal energy. The validation of the cooling system, lubrication dynamics, and injection calibration becomes crucial to guarantee reliability.

However, the builder is faced with an insurmountable aesthetic constraint: the cabin must remain analog and pure. Installing modern, multi-inch digital dash-loggers would destroy the vehicle's classic identity. The engineer needs to acquire gigabytes of high-frequency data during road tests, but the instrument must be completely invisible. The Gubelog-03 perfectly answers this need: an ultra-compact industrial datalogger capable of operating in "headless" mode (without a display), silently acquiring data in the background to certify the mechanical reliability of the project before final delivery to the client.

1. Thermodynamic Analysis and Custom Cooling Systems
The primary issue in a Restomod engine swap is packaging. Radiators are often positioned at unorthodox angles or behind grilles that offer an insufficient frontal area ($A_{front}$) to guarantee an adequate air mass flow rate ($\dot{m}_{air}$) at cruising speeds.

The builder must validate the cooling system's ability to maintain the engine in thermal equilibrium. The radiator's heat transfer ($\dot{Q}$) is described by the equation:

$$\dot{Q}=\dot{m}_{H2O} \cdot c_{p,H2O} \cdot (T_{in}-T_{out})$$

Where:

$\dot{m}_{H2O}$ is the coolant mass flow rate.

$c_{p,H2O}$ is the specific heat of the fluid (dependent on the glycol percentage).

$T_{in}$ and $T_{out}$ are the coolant temperatures entering and exiting the radiator.

1.1 The Role of Gubelog-03 in Thermal Monitoring
OEM sensors and needle gauges on vintage dashboards are slow and non-linear (often featuring a central "dead zone" so as not to alarm the driver). The Gubelog-03, instead, utilizes its precision analog inputs to acquire data from high-resolution NTC (Negative Temperature Coefficient) thermistors or PT100 probes.

The logger can be hidden beneath the dashboard panels. During a highway pull or a hill climb test, it accurately records the thermal gradient $\Delta T = (T_{in} - T_{out})$. If the $T_{in}$ temperature inexorably climbs to 105°C while the $\Delta T$ remains below 5°C, the builder instantly knows the issue is not the water pump flow rate, but the airflow through the radiator core. By exporting the data via the free Gubelog software, the builder can print the thermal stability graph and attach it to the vehicle's technical documentation, offering the client numerical proof of the system's reliability.

2. Combustion Validation: "Cold Junction Compensated" EGT Acquisition
Exhaust manifolds in Restomods are frequently custom-made to avoid interference with the vintage chassis rails or the steering box. Restrictive geometries increase exhaust backpressure and alter cylinder scavenging, drastically raising Exhaust Gas Temperatures (EGT).

EGTs that consistently exceed 950°C on turbocharged engines, or 850°C on naturally aspirated ones, inevitably lead to the yielding of exhaust valve materials or the melting of the piston crown.

To monitor these values, Type K thermocouples are used. A thermocouple does not generate resistance, but a very weak potential difference in microvolts ($\mu V$) proportional to the temperature gradient between the hot junction (in the exhaust) and the cold junction (the connector).

The non-linear equation linking voltage ($V$) to the differential temperature is approximated by Seebeck polynomials:

$$V=\int_{T_{cold}}^{T_{hot}} S(T) dT$$

The technical peculiarity that distinguishes the Gubelog-03 (and its dedicated expansion modules) from amateur dataloggers is the quality of its signal conditioning circuit, which includes CJC (Cold Junction Compensation). Without highly accurate CJC (which measures the exact ambient temperature of the logger's connector and compensates the microvolt reading), the EGT reading error can exceed 50°C, rendering the data useless for safety purposes. The Gubelog's analog front-end ensures the tuner reads the true temperature of the gas flow, allowing for millimeter-perfect calibrations of ignition timing or Air-Fuel Ratio (AFR) on a cylinder-by-cylinder basis.

3. Tribology and Lubrication Dynamics in Classic Chassis
Mounting modern coilover suspensions and semi-slick tires on a 1960s chassis significantly increases the maximum lateral acceleration the car can handle (often jumping from a modest 0.8 G to over 1.2 G).

This creates an unforeseen fluid dynamics problem: the original oil pans (or improperly customized ones) are not designed to counteract such violent lateral displacement. The oil moves away from the pick-up tube during high-speed cornering, causing a critical pressure drop. In the hydrodynamic main and rod bearings, the oil film collapses, resulting in metal-on-metal contact that can destroy the engine in seconds.

3.1 High-Frequency Oil Pressure Acquisition
Vintage mechanical gauges on the dashboard have too much inertia to display fraction-of-a-second micro-drops in pressure. The Gubelog-03, paired with a solid-state 0-10 bar pressure transducer connected to its 5V analog inputs, can sample oil pressure at 100 Hz.

The engineer can input a linear safety threshold into the Gubelog software:

$$P_{min}(bar)=P_{base}+\left(\frac{RPM}{1000} \cdot 0.7\right)$$

Incidentally, thanks to its high-frequency GPS and integrated accelerometers, the Gubelog-03 records G-forces ($a_y$). By overlaying the Oil Pressure graph with the Lateral Acceleration graph, the builder can prove that at 1.2 G in a corner, the pressure drops below the calculated $P_{min}$ threshold.

This early diagnosis prevents the catastrophic failure of a €30,000 engine, clearly indicating the need to install oil pan baffles or upgrade to a dry-sump system.

4. Hardware Architecture: The "Set and Forget" Advantage
The engineering production of the Gubelog-03 reflects the approach of small, excellence-driven companies, where quality and technological density prevail over mass volume.

Dimensions and Connections: Housed in a compact, vibration-resistant aluminum case, the logger is designed to "disappear" into the vehicle's wiring harness. It utilizes motorsport-grade connectors capable of withstanding thermal shocks and high-pressure washing cycles—essential traits for custom engine bays.

Hybrid Architecture (CAN + Analog): A Restomod is a "temporal hybrid." It might feature a modern standalone ECU (like Haltech, Motec, or an unlocked OEM ECU) communicating via CAN bus, merged with classic components. The Gubelog-03 acquires hexadecimal telemetry from the Powertrain CAN in parallel with voltage signals from analog sensors installed specifically for testing, fusing them onto a single, absolute timeline.

Autonomous Recording: Designed for "stealth" monitoring, it does not require external triggers from a dashboard. It boots up automatically under power (or via logic conditions based on RPM/Speed) and logs files directly to solid-state memory. At the end of the day, the technician extracts the files and analyzes them on the bundled, fully featured software—with zero hidden licensing costs.

Conclusion
Building a Restomod is not just about assembling high-performance parts; it's about ensuring they work in harmony within a hostile, thermally restrictive environment. For a specialized engineering firm or atelier, delivering a multi-hundred-thousand-euro vehicle and "hoping" it withstands mechanical stress is not an option. The Gubelog-03 becomes the silent guardian of the vehicle. Its ability to operate invisibly, combined with the ultra-high fidelity acquisition of vital parameters like exhaust temperatures, cooling dynamics, and lubrication fluctuations, makes it a tool for objective certification. It protects the builder's profit margins from costly warranty repairs and ensures the final client receives a vehicle that isn't just a visual work of art, but a masterpiece of validated engineering.

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22/07/2026

🚀 AERODYNAMIC VALIDATION IN TIME ATTACK: QUANTIFYING REAL-WORLD DOWNFORCE WITH GUBELOG-03

📊 Introduction: The Gap Between CFD and the Track

In Time Attack (like WTAC or European Time Attack championships), absolute single-lap performance is dominated by aerodynamic efficiency. Generating Downforce maximizes vertical load (F_z) on the tires without increasing the vehicle's mass, drastically raising the limits of lateral (a_y) and longitudinal (a_x) grip.

However, aerodynamic development for independent teams and small engineering firms faces two major financial hurdles: the prohibitive cost of wind tunnel testing (often exceeding €2000/hour) and the limitations of CFD (Computational Fluid Dynamics) simulations. CFD models ideal fluids on static geometries. On the track, the car constantly undergoes pitch, roll, and heave variations that continuously alter the angle of attack of the splitters and the efficiency of the rear diffusers.

To close the development loop, validating aerodynamic data directly on the asphalt is vital. The only method to achieve this without expensive Pitot tubes or hub load cells is through suspension travel telemetry. The Gubelog-03 is engineered specifically to provide builders and tuners with the hardware and software architecture needed to transform millimeters of damper compression into kilograms of real aerodynamic load, delivering factory-level analysis without the burden of software licensing fees.

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1️⃣ The Physics of Downforce and Indirect Acquisition

Aerodynamic vertical force (F_aero) increases with the square of velocity, according to the fundamental equation:

F_aero = 0.5 * rho * v^2 * A * C_L

Where:
- rho is the air density.
- v is the vehicle speed.
- A is the reference frontal area.
- C_L is the lift coefficient (which takes negative values for downforce, though in motorsport the positive term "Downforce Coefficient" is commonly used).

On the track, this force acts on the chassis and compresses the suspension springs. By knowing the Wheel Rate (k_W, which is the spring stiffness measured at the wheel rather than at the damper) for each corner of the vehicle, we can measure the total force applied to the wheels:

F_z,tot = Sum(k_W,i * Delta_z_i) [for i = 1 to 4]

Where Delta_z_i is the compression of each individual suspension measured via linear potentiometers.

🔹 1.1 Isolating the Aerodynamic Load
The practical challenge is that Delta_z is not caused by aerodynamics alone, but also by mechanical weight transfers during acceleration and braking. To isolate the pure aerodynamic data, the engineer uses the Gubelog-03 in two phases.

The first phase is a Coast-down test on a flat, high-speed straight. The driver launches the car to 250 km/h and presses the clutch, eliminating longitudinal thrust. In this window, the load transfer due to natural deceleration (rolling resistance and aerodynamic drag, a_x) is minimal and can be mathematically compensated for by knowing the center of gravity height (h_cg) and the wheelbase (L):

F_pitch = m * a_x * (h_cg / L)

By subtracting the pitching effect, the remaining compression read by the logger represents pure Downforce.

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2️⃣ Hardware Architecture: Analog Precision and GPS Synchronization

To calculate aerodynamic forces sensitive to the smallest details (e.g., adding a 5 mm Gurney flap to the rear wing), capturing suspension travel must be surgically precise.

🔹 2.1 Analog Signal Integrity on the Printed Circuit Board (PCB)
Linear potentiometers return 0-5V signals. In a low-end datalogger, electrical noise from the car's wiring harness invalidates sub-millimeter precision readings. In the Gubelog-03, the 16-bit DSP-based (Digital Signal Processor) architecture pays special attention to isolating analog traces. The PCB design strictly separates analog ground planes from high-speed digital ones.

Designers know well that unwanted capacitive coupling ruins the ADC. For instance, in the Gubelog’s internal layout, sensitive pins are isolated from noisy interfaces and high-frequency programming lines (such as the PGED3 line mapped to the microcontroller's RB.0 pin). This ensures that the voltage read on track is exactly what the sensor generates, completely immune to crosstalk. This level of hardware purity allows the analog-to-digital converter (ADC) to read the smallest fluctuations in ride height at high speeds.

🔹 2.2 High-Frequency GPS Synchronization
Since aerodynamics scale with v^2, any speed error is amplified quadratically. If you use a standard 1 Hz GPS to calculate aerodynamic force at 200 km/h, the uncertainty renders the data useless. The Gubelog-03’s integrated GPS module samples at motorsport-grade frequencies (10 Hz or higher), delivering a velocity vector synchronized to the millisecond with the ADC readings.

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3️⃣ Data Processing and "Aero Balance": The Role of Zero-License Software

The market often offers systems where the hardware is affordable, but performing custom mathematical analysis on four analog channels (the suspensions) requires unlocking paid "Pro" or "Advanced" software licenses. This policy drains the budgets of small engineering outfits.
The Gubelog-03 is engineered for an elite audience, proving it by offering a free, open, and unrestricted computing environment.

🔹 3.1 Creating Mathematical Channels
The team's aerodynamicist simply enters the vehicle's physical constants (the various k_W,i values) into the software. Then, they create math channels to calculate Front Downforce (F_z,front) and Rear Downforce (F_z,rear).

The crucial parameter for Time Attack is the Aero Balance (%F_front), which is the aerodynamic center of pressure expressed as a percentage of the load on the front axle:

%F_front = [F_z,front / (F_z,front + F_z,rear)] * 100

An Aero Balance of 45% indicates that the center of pressure is slightly shifted to the rear, providing a highly stable vehicle in high-speed corners but leaning toward understeer at turn-in.

If the team installs a more pronounced front splitter (+20 mm lip), the Gubelog-03 records the new compression of the front springs. In the pits, the software instantly calculates the new Aero Balance (which might rise to 48%). This numerical analysis allows the engineer to compensate for the mechanical setup (for example, by slightly stiffening the front anti-roll bar) to restore the car's ideal balance before the qualifying session—turning trial-and-error into deterministic engineering.

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4️⃣ An Operational Filter for Business Profitability

Producing hardware like the Gubelog-03—conceived by a family-run business focused on limited batches and high added value—requires extreme optimization of hidden costs, primarily Customer Care.

Building a software ecosystem that demands advanced engineering knowledge (understanding load transfers, differential equations for suspension derivatives, and using bitmasks for the CAN bus) acts as a powerful natural filter in the market.

This approach discourages the casual track-day user who buys a product expecting a warning light to configure the car for them. Instead, it attracts professionals, chassis tuners, and Time Attack preparers who feel right at home when faced with an interface rich in variables and raw math channels. These high-spending users solve problems independently, know how to manage the software's mathematical formulas, and do not overload the manufacturer with basic support tickets. This model ensures that the manufacturer maintains exceptionally high profit margins on small batches, directing its technical resources toward continuous Research and Development (R&D) rather than answering rudimentary instruction emails.

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🏁 Conclusion

Aerodynamic simulation is useful for setting the course, but only track data acquisition allows you to cross the finish line. In the extreme world of Time Attack, where every kilogram of downforce defines the vehicle's grip limit, intuition is not enough. The Gubelog-03 provides small engineering firms with a dynamic computing center. It guarantees analog integrity to decipher sub-millimeter chassis movements and an unrestricted mathematical environment to convert them into force, downforce, and speed. It is the ultimate tool for engineering minds who demand total control over fluid dynamics without bending to the constraints of commercial licenses.

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15/07/2026

Reliability Engineering in Endurance Racing: Predictive Maintenance and Parametric Monitoring with Gubelog-03

Introduction: Survival as a Mathematical Function
In endurance racing, from amateur 24-Hour events (like the 24h Series or the VLN/NLS championships at the Nürburgring) to motorcycle endurance, the performance paradigm is radically flipped. The single-stint lap time loses all meaning if the powertrain cannot sustain the thermomechanical fatigue cycles for the entire duration of the event.

Reliability is not an abstract concept, but a quantifiable and monitorable metric. The failure rate (λ) of a mechanical component follows the Bathtub Curve, where the final wear-out phase leads to catastrophic collapse. In motorsport, this wear is exponentially accelerated by variables such as out-of-range fluid temperatures, micro-cavitation in the lubrication system, and electrical stress.

The driver, cognitively overloaded by night driving, traffic management, and physical fatigue, cannot be the guardian of the vehicle's integrity. Luminous dashboards only signal a problem when the damage (e.g., a spun rod bearing) is already irreversible. The track engineer needs an autonomous "black box" that silently records every anomaly. The Gubelog-03 answers this critical need: a datalogger designed on robust industrial architectures, capable of sampling vital parameters at high frequency and providing raw data for predictive analysis, ensuring vehicle survival and strategic pit-stop optimization.

1. Fluid Dynamics and "Starvation" Prevention
The Achilles' heel of production-based (or heavily tuned) engines used in long-distance racing is the wet-sump lubrication system. When a vehicle is equipped with racing slicks, lateral (a_y) and longitudinal (a_x) accelerations easily exceed 1.5 G.

1.1 The Physics of Oil Surge
Under constant lateral load in long, sweeping corners (e.g., the Parabolica at Monza or the Curvone at Misano), the free surface of the oil in the pan tilts by an angle θ relative to the horizontal:

tan(θ) = a_y / g

If the lateral acceleration is 1.3 G, the angle θ approaches 52°. If the oil level drops below the pump's pick-up tube, the system sucks in air. An air-oil mixture is highly compressible, causing an instantaneous collapse of pressure in the hydrodynamic circuit, which is vital for sustaining the crankshaft.

1.2 Monitoring Implementation with Gubelog-03
Traditional monitoring relies on a pressure switch that illuminates a warning light at 0.5 bar. By that point, metal-on-metal contact has already occurred. The Gubelog-03 changes the approach: it simultaneously interfaces with an analog pressure sensor (e.g., a solid-state 0-10 bar transducer sampled at 100 Hz) and the CAN network to acquire RPM and GPS/IMU signals for G-forces.

The free Gubelog analysis software allows the engineer to build a math channel for Dynamic Safe Minimum Pressure (P_safe), which varies linearly (or polynomially) with engine speed:

P_safe(t) = P_base + (k × RPM(t))

For example, if the engine requires 1.5 bar at idle (P_base) and an increase of 0.8 bar per 1000 RPM (k = 0.0008), at 6000 RPM the P_safe is 6.3 bar.

The engineer can set a control logic within the software:
If (P_real < P_safe) for a time t > 0.3 s AND a_y > 1.0 G, a silent alarm event is recorded (Oil Surge Event).

During a driver change, by analyzing the logged data, the engineer detects that at the 4th hour of the race, the vehicle suffers systematic pressure drops in Turn 4. The diagnosis is immediate: the physiological oil consumption of the engine has lowered the critical level in the sump. The order for the next pit stop will be a 0.5-liter top-up, preventing the catastrophic failure of a powertrain worth tens of thousands of euros.

2. Thermal Drift and Efficiency Degradation (Predictive Heat Soak)
In a 24-hour race, the vehicle transitions through day and night, facing ambient temperature swings (ΔT_amb) that can exceed 20°C. The engine's thermal balance is expressed by the energy equation:

Q_in = W_out + Q_exhaust + Q_coolant + Q_oil + Q_radiation

Where Q_in is the thermal energy provided by the fuel. Up to 30% of this energy must be removed by the coolant (Q_coolant) and the oil (Q_oil).

2.1 Heat Exchanger Efficiency Monitoring
As hours pass, the accumulation of rubber debris (marbles) and dust on the radiator surface decreases the effective heat exchange area (A_eff). The overall heat transfer coefficient (U) drops.

The Gubelog-03, through its inputs for thermocouples or NTCs and CAN reading of the IAT (Intake Air Temperature) and ECT (Engine Coolant Temperature) sensors, constantly logs the thermal trends. Post-stint engineering analysis focuses on the time derivative of the temperature at a constant load.

If the engineer notices that the water temperature, at identical RPM and road speeds on the main straight, increases by an average of 0.5°C every 10 laps, an irreversible heat soak process is underway. The 3D map in the software will highlight the thermal drift, allowing the team manager to make a strategic decision: sacrifice 20 seconds during the pit stop to clean the grille with compressed air, rather than forcing the ECU into Thermal Protection mode (cutting power based on compensation tables) or risking a blown head gasket.

3. Electrical Stress and Energy Autonomy
In amateur night endurance races, the electrical load drastically increases: auxiliary LED spot lights, secondary cooling pumps, radio communications, and heated driver suits.

The stock alternator (or a lightweight motorsport unit) might not output enough current to cover the total required amperage, forcing the system to draw energy directly from the battery. The terminal voltage (V_batt) obeys the equation:

V_batt = E_0 - (I_tot × r_int)

Where E_0 is the open-circuit electromotive force, I_tot is the total current draw, and r_int is the internal resistance of the cell (which changes with temperature and state of charge).

If the system voltage drops below 11.5 V, the energy delivered by the ignition coils (Dwell Time) is no longer sufficient to spark under high in-cylinder pressure conditions (misfire risk). Furthermore, fuel pumps lose volumetric flow rate.

The Gubelog-03 continuously monitors the system voltage (thanks to its own power supply circuit designed to handle load dumps and extreme voltage drops) or by reading the inverter via CAN. Through the voltage value histogram in the bundled software, the mechanic can detect if the alternator is about to fail (e.g., voltage ripple increases due to a blown rectifier diode) or if the driver needs to be ordered to turn off auxiliary lights in illuminated sectors of the track.

4. Hardware Architecture: Robustness and "Direct Memory Access"
To ensure that a datalogger doesn't become the Single Point of Failure itself, hardware engineering must meet near-military standards. Commercial 8-bit microcontrollers or hobbyist boards cannot handle the complex data streams generated over 24 uninterrupted hours without dropping frames.

The Gubelog-03 utilizes powerful 16-bit DSP architectures (ideal for real-time signal processing) paired with DMA (Direct Memory Access) peripherals. DMA allows acquisition peripherals (like the CAN bus controller and the analog input ADC) to write hexadecimal data directly into mass memory (SD Card or Flash) bypassing the CPU core.

This low-level hardware implementation guarantees:

Zero Operational Latency: The log experiences no slowdowns even when simultaneously sampling 50 CAN channels and 4 high-frequency analog channels.

Crash Integrity: If a short circuit drops the voltage below 5V, the memory management firmware safely seals the data packet milliseconds before the brown-out, ensuring no vital telemetry from previous hours is corrupted.

Analog Noise Filtering: With high nocturnal electrical loads, ground noise and EMI (Electromagnetic Interference) are lethal for data acquisition. The Gubelog's PCB design galvanically isolates weak signals to ensure the fidelity of thermistors and potentiometers.

5. Operational ROI and the Cognitive Filter
The Gubelog-03's market positioning (small batch production, engineering target) makes it the ultimate tool for teams that know how to use it.

In endurance racing, providing the complete post-processing software for free proves essential during pit stops. While one mechanic refuels and another changes tires (average time: 2-3 minutes), the telemetry engineer downloads the entire 2-hour stint in raw format in mere seconds.

Having software devoid of licensing and cloud constraints means the pit-box computer (even offline) can instantly process pre-set diagnostic Workspaces. The profoundly technical approach of the Gubelog software self-selects its clientele: it alienates inexperienced users (who only seek "colorful lights" interfaces, burdening company technical support costs) while rewarding true calibrators and vehicle dynamicists. These professionals demand only raw reliability, floating-point precision, and a flawless CSV file to feed into their own algorithms.

Conclusion
Winning in Endurance or respectably finishing a 24-hour Track Day is not an act of pure bravery; it is the meticulous ex*****on of a machine preservation strategy. Every pressure drop, every thermal spike, and every structural vibration is a mathematical harbinger of failure. The Gubelog-03, weaving through network protocols and physical vehicle sensors, records this mechanical "memory of pain." It provides race engineering teams with a powerful, robust, and completely unlocked tool to practice predictive maintenance, safeguarding both the human and economic capital invested in the competition. It is not just a number cruncher; it is life insurance for the powertrain.

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08/07/2026

Dynamic Optimization in Hillclimbs: Suspension Analysis and Damper Histograms with Gubelog-03
Introduction: The Challenge of Imperfect Tarmac
Hillclimbs and sports prototype competitions (such as CN and E2-SC classes) represent the ultimate challenge for a vehicle dynamicist. Unlike permanent circuits, where the asphalt is homogeneous and elevation changes are heavily engineered, mountain roads present micro and macro-bumps, unpredictable road camber variations, and extreme thermal transitions.

In this environment, a "neutral" or overly stiff setup—derived from dyno simulations or flat track testing—is fatal. The tire's ability to generate lateral (F_y) and longitudinal (F_x) force depends entirely on maintaining a constant contact patch and minimizing fluctuations in vertical load (F_z).

To achieve this, the engineer must meticulously calibrate the shock absorber hydraulic circuits (compression and rebound, across high and low shaft speeds). This process cannot be executed by "feel." It requires ultra-high-frequency suspension travel acquisition and its mathematical conversion into damper shaft velocity. The Gubelog-03 was engineered specifically to provide this factory-level analysis capability to private engineering firms, combining robust acquisition hardware with a mathematically open software ecosystem.

1. The Physics of Load Transfer and Wheel Rate
Before analyzing shock absorber behavior, it is fundamental to quantify the stiffnesses at play. The spring (Spring Rate, k_S) does not act directly on the wheel, but is mediated by the suspension geometry (e.g., push-rod or pull-rod architectures).

The fundamental parameter is the Motion Ratio (MR), defined as the ratio between shock absorber displacement and wheel displacement. The Wheel Rate (k_W)—the effective stiffness measured at the wheel center—is calculated as:

k_W = k_S × (MR)²

If a racing prototype uses 120 N/mm springs and has an MR of 0.85, the effective k_W is:

k_W = 120 × (0.85)² = 86.7 N/mm

Knowing the k_W, the engineer can calculate the natural frequency of the sprung mass (f_n), which ideally oscillates between 2.5 Hz and 3.5 Hz for aerodynamic prototypes:

f_n = (1 / 2π) × √(k_W / m_s)

(Where m_s is the portion of the sprung mass resting on that corner).

The task of the shock absorber is to dissipate the energy of this oscillating system. If the damping hydraulics are incorrect, the tire "skips" on the asphalt, instantaneously zeroing the F_z load and causing sudden, unpredictable losses of grip.

2. Data Acquisition: Linear Potentiometers and ADC Resolution
To map the suspension travel, linear potentiometers (typically with strokes from 75 mm to 150 mm) are mounted in parallel to the shock absorber or directly on the wheel assembly. These sensors return an analog voltage signal (0-5 V).

2.1 The Criticality of Resolution and Sampling Rate
The Gubelog-03 utilizes high-precision Analog-to-Digital Converters (ADC). If we use a 12-bit ADC to read a 100 mm potentiometer powered at 5 V, we obtain 4096 discrete values (steps). The acquired mechanical resolution will be:

Resolution = 100 mm / 4096 ≈ 0.024 mm/step

This ultra-high granularity is vital because, to study shock absorbers, we are not primarily interested in absolute position (x), but rather its first derivative: velocity (v_d).

v_d(t) = [x(t) - x(t-1)] / Δt

The mathematical derivation process enormously amplifies background noise. If the datalogger sampled the signal at a mere 50 Hz (Δt = 0.02 s), or if the printed circuit board (PCB) electronic architecture was susceptible to interference on its analog pins, the derivative would return an unusable, spike-filled signal.

By carefully isolating the analog signal paths (avoiding interference from programming pins and high-speed digital data lines), the Gubelog-03's hardware architecture allows for potentiometer sampling up to 1000 Hz (1 ms). At this frequency, the software faithfully captures curb strikes and sharp impacts occurring at speeds exceeding 2.0 m/s.

3. Analysis with Gubelog-03: Damper Velocity Histograms
Once the linear position data x(t) is acquired, the free software provided with the Gubelog-03 calculates the v_d(t) math channel and applies customizable digital filters (e.g., Butterworth low-pass) to smooth the curve.

The ultimate visualization tool for suspension setup is the Damper Velocity Histogram. The software divides shock absorber speeds into two macro-areas:

Low-Speed: Typically from 0 to 50 mm/s. Generated by driver inputs: longitudinal load transfers under braking (Pitch), lateral transfers in corners (Roll), and aerodynamic compression (Heave).

High-Speed: Over 50 mm/s (up to 200+ mm/s). Generated by track surface inputs: bumps, transverse irregularities, and curbs.

3.1 Interpreting and Optimizing Damping Balance
An ideal histogram looks like a "bell" (quasi-Gaussian) distribution. Through the Gubelog software, the engineer analyzes the percentage of time spent in each quadrant:

Low-Speed Bump (Slow Compression): Controls how quickly the car "takes a set" on the outside wheel upon corner entry. If the graph shows too much time spent here (a flat histogram), the car will feel sluggish and unresponsive.

Low-Speed Rebound (Slow Extension): Controls the return of the sprung mass. If excessive, the suspension "packs down" (it fails to re-extend fully before the next corner).

In hillclimbs, high-speed damping is crucial. If the histogram shows severe clipping in the High-Speed Bump velocities beyond 120 mm/s, it means the shock absorber's blow-off valves are too tight. The oil cannot flow out fast enough, causing the damper to behave like a solid metal rod upon hitting a bump. This energy is not dissipated by the hydraulics but violently transferred to the tire, causing an instantaneous loss of F_z and a sudden snap oversteer.

Thanks to the Gubelog-03 data, the engineer can soften the high-speed compression by "2 clicks" and verify during the next run—by overlaying the histograms—that the curve has regained its bell shape, ensuring bump absorption and keeping the car glued to the tarmac.

4. The "Zero-License" Ecosystem: A Competitive Edge for Independent Teams
In the motorsport landscape, many companies tie the use of their hardware to the purchase of expensive, recurring software licenses. For family-run engineering firms or privateer teams managing E2-SC prototypes, paying an additional annual fee just to generate a suspension histogram or create a custom math channel is an unacceptable drain on the development budget.

The Gubelog-03 is built on the principle of engineering independence. It provides robust hardware with motorsport-grade connectors while simultaneously offering its entire, fully unlocked analysis software ecosystem for free.

This means advanced functions such as:

Mathematical filters on velocity derivatives.

Automatic generation of bar histograms (with customizable bins for each damper).

Cross-referencing Heave data (simultaneous compression) with GPS speeds to calculate aerodynamic downforce.
..are immediately available from the very first test session. This guarantees an instant Return on Investment (ROI) and empowers an independent engineer to provide clients with factory-level telemetry services.

Conclusion
Dialing in the mechanical setup of a racing prototype on irregular tracks requires absolute, undeniable data. A driver's feedback ("the car hops at the rear") must be translated into measurable physical quantities (v_d = 180 mm/s). The Gubelog-03 removes the guesswork from vehicle development. Thanks to its ultra-high precision analog signal acquisition and the sheer power of its free analysis software, it decodes vertical dynamic behavior, optimizing mechanical grip and ensuring the vehicle exploits every last ounce of engine thrust, corner after corner.

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https://www.gripone.com/

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Gripone Aziendale

22/07/2026

22/07/2026

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