STealthwerx Performance

STealthwerx Performance STealthwerx was born out of a lifelong passion for cars and performance. What makes us different? Our relentless pursuit of perfection.

NORWICH, NORFOLK

Ford, VAG, BMW, MINI , Mercedes and more
Servicing
Diagnostics
Paintwork
Detailing
Modifications - Supply + Fit
Custom software solutions with TRS Performance We always try and achieve the best results for each car in every aspect, not just peak numbers on a dyno, but how the car feels to the individual. We are now able to offer custom TRS Performance Software, meaning we can fin

e tune further each car in conjunction with their calibration engineer with immediate support

Ford, VAG, Mercedes and BMW are catered for with full datalogging capability for each brand at an indepth level. With a combined 25 years of overall experience working on cars,

We are dealers for -
TRS Performance
Airtec Motorsport
Milltek
Forge Motorsport
VMaxx,
EBC
Remus
BC Racing,
Motul
ITG
GFB
SuperPro

Myself and Dom took our S280A track car and my own personal S270A ST out at Snetterton this afternoon for some playtime!...
17/06/2026

Myself and Dom took our S280A track car and my own personal S270A ST out at Snetterton this afternoon for some playtime!

Back tomorrow of course and I'll respond to the messages and emails during the course of the day 🙏🏻

A very busy week and these are just some of the cars we have had come into the workshop!Tom's blue ST in for S280 upgrad...
13/06/2026

A very busy week and these are just some of the cars we have had come into the workshop!

Tom's blue ST in for S280 upgrade, previously X49RS but he is going more track biased for this car.

Whilst there was nothing wrong with the old unit, the proven track record of the Turbo Technics unit and scope for more power long term makes it a far better option for hard track use.

Its a fairly basic set up, with the usual Airtec Induction/full height cooler, Scorpion sports cat, and this one is still using the stock actuator.

We dropped the boost level down compared to the hybrid before , but it was still transformed with that meaty and punchy 280 feel, set at a very sensible 1.55 bar until further upgrades are made (cooler thermostat, upgraded actuator and injectors) it still did a very respectable 300bhp @6800 rpm.

We also had his and hers services for Tylers black ST and his girlfriends white example, these are both very well looked after cars and a credit to them with how immaculately they were presented.

Onto another blue ST, Sam's car had new brakes up front with EBC bluestuff pads, new upper engine mount, boost control solenoid and rocker cover gasket replacement.

A poorly Focus ST250 also came in for an engine healthcheck, lower compression on No.1 and the presence of oil in the cylinder and signs of det on the piston crown, combined with the owner not knowing the car was sold to him as mapped meant classic LSPI ringland failure 😞

Also a nice and easy Powerflex beam bush replacement on George's Zetec-S which must have handled like a wet sponge with the amount of play in the pins!



Contact us on 👇🏼

☎️ 0759232320
📧 [email protected]
📍 STealthwerx, Unit 15 Drayton industrial estate, Taverham Road, Drayton, Norwich, Norfolk, NR86RL

📌 Performance Parts and Fitting
📌 Servicing, Diagnostics and Repairs
📌 Full 360 degree Health Checks
📌 In-depth datalog analysis
📌 Custom calibrations with TRS Performance
📌 EGR, DPF & Adblue solutions

June availability!We have the following dates available in the latter half of June mainly , with the odd day sooner due ...
07/06/2026

June availability!

We have the following dates available in the latter half of June mainly , with the odd day sooner due to cancellations -

Monday 15th
Thursday 18th
Tuesday 23rd
Wednesday 24th
Thursday 25th
Friday 26th
Monday 29th
Tuesday 30th

If you need something sooner its a case of squeezing you in!

Best way to contact as ever is via Whatsapp, Email and then phone but please leave a voicemail if you do call rather than leaving 10 missed calls in a row.

Picture for attention of the weather I want in June so it sorts its bloody act out for the rest of the month.

Turn it up please.So we did.But you know its never that simple.Previous owner of the car Matt visited us in November las...
06/06/2026

Turn it up please.

So we did.

But you know its never that simple.

Previous owner of the car Matt visited us in November last year with his S280 powered track prepared ST for an overboost condition.

At the time, this was down to a failed boost control solenoid.

Sadly, this consistent boost level had stressed the engine, with the emergence of cracks in a couple of cylinders, but not at the stage of losing compression or affecting coolant.

The choice was made to turn it down to a more sensible level to preserve it, sitting at 1.55 bar and reduced timing.

Not long after, he sold the car to Ellis at ESM.

Needless to say, he hasn't been gentle on the car, and recently did 14 laps of the ring.

Remarkably, it showed no signs of further determination internally!

But he wanted it turning up.

Since its last visit it was clear the car wasn't the same as it was, with boost very slow to build across the board.

In order to get the car at a higher boost level, we had to solve the reason why first.

We didn't have any leaks, nor codes.

We did have a compromised actuator rod angle as it appears the compressor housing has been rotated slightly, not ideal for the already weak stock actuator which cracked the moment pressure was applied.

To fix, a spare A actuator was fitted, and an angle added to the clevis arm to improve on the angle - Not perfect, but better.

The Forge recirc valve was removed, inspected and hose routing reconfigured as it was rather messy before.

These changes made a difference, but it still wasn't right.

The only other potential cause was the not long replaced genuine boost control solenoid.

New one fitted, log completed, and we had what we wanted - Perfect boost control, perfect response, no rail dips with the higher boost, and only a knackered LP in the tank as a weak point, I have advised this to be changed.

Why did the solenoid fail? Not exactly sure, it failed the opposite way of the last one, and it could simply be the heat from heavy track use that contributed, as well as the actuator angle.

Being Essex, Ellis wanted it dyno'ed.

Back to Joey at Autoculture Tuning - AC Tuning to use his MAHA and it did a 340bhp @7300 rpm - Cannot argue with that, considering its not perfect in some areas , we can only do the best we can with whats presented to us and the customer budget/time constraints.

As you can see, its never straightforward..

Revisiting Stage 2!My own personal car has been a bit of a testbed the 5 years I've had it. Various hybrids, S280 paired...
06/06/2026

Revisiting Stage 2!

My own personal car has been a bit of a testbed the 5 years I've had it.

Various hybrids, S280 paired with Turbosmart and CP actuators, and its final form , S280A with development actuator and larger injectors.

With our own track car taking over on the S280 side, I decided to revisit Stage 2, to see how good we could get it.

Retaining the Stage 3 hardware consisting of -

ITG full induction
Pro400 Gen2 Intercooler
GFB DV+ valve
Milltek turbo back system

Stock coldside remains, with the sound symposer still on (you know, the one that always leaks boost 🤨)

Airtec 50mm hotside refitted as the TT unit uses its own.

Software - TRS Performance STG2 with optimisation to timing and actuator settings

And the key component, the biggest age/mileage related variable which affects power, we used the lowest mileage stock turbo we could find, with mileage around 35k and a slight nip to the base preload.

A very strong 246bhp was the end result!

Whilst I would not guarantee you would see the same on every car, it is possible to achieve solid power if the turbo is performing efficiently, its not going to do this if the wastegate arm bushing has worn oval, and actuator adjustment/stronger actuators will help but not eliminate the wear - If you want it perfect, you'll need a refurbished turbo.

That comes at a cost , and for some it might be justifiable if you are happy with how a Stage 2 car can perform when its at full potential, but for others, the case the upgrade to Stage 3 is very tempting for not much more - That's where the S270 comes in, and is the next step for this car.

Dyno video in comments

Dyno testing carried out on a MAHA MSR500 at Autoculture Tuning - AC Tuning

Kristian's very clean 2016 Fiesta ST in for TRS Performance STG1 tuning with ITG Air Filters Induction kit, but as alway...
05/06/2026

Kristian's very clean 2016 Fiesta ST in for TRS Performance STG1 tuning with ITG Air Filters Induction kit, but as always, we check em first, no matter how straight the car looks!

No horrors. Everyone gets slightly anxious with an engine healthcheck, the same as they would going to the doctors.

The plugs came out a little too easily though, because they were loose, and that was the cause of the ticking noise up top and a slight smell of fuel on arrival...

But the engine was as clean as the rest of the car, so after some visual checks over the rest of it, we did a stock log first.

This revealed an excellent base for tuning, with all the parameters spot on for a standard car.

On the tuning side, even when they are running 99 fuel like this one, we will factor in the stock intercooler which in hotter weather is marginal, whilst this is no issue for the software to handle (it will reduce load once it exceeds 40-45c) it does mean it is also unlikely to hit a higher ignition target as a result, so asking for less makes things cleaner and less messy.

Load was perfect, so it was certainly making decent torque of around 370nm (depending on the dyno) and bhp in the mid to high 220's, it would only take a better intercooler to see more and it will then handle some more ignition to pin the top end up where the stock turbo runs out of puff.

Not a 5 minutes flash and dash, it doesn't matter how good you think your car is, we will find something we can improve on whilst its here - A quick little car for very little expense relative to the gains achieved.

Probably the most popular car we tune other than Fords and for good reason - we have brilliant software for the VAG plat...
05/06/2026

Probably the most popular car we tune other than Fords and for good reason - we have brilliant software for the VAG platform!

Leo's Golf GTi 230ps in for TRS Performance Stage 1 calibration.

Leo wanted to use 95 ron for now, and he was also aware on these manual variants that the clutch is the weak point, so effectively this is the lowest we can go in terms of worthwhile gains at a Stage 1 level.

Torque is capped , but it's still not lacking a significant gain over stock, with logs showing 462nm, less than the 500nm you can easily do, but sensible until the clutch is upgraded.

Mass air flow again showed a decent gain, boost exactly as requested with around 290bhp, all this with perfect timing across the board and zero pull.

I actually really like these with a 'stick shift', and you can tell there is more left on the table, the delivery is strong and effortless , it's just a shame VW underspecced the clutch!

Would you like your VAG car tuning? Contact us for more details!

Chris in yesterday with his Stage 3 Fiesta ST, changing from X47R to Turbo Technics S280A and bigger injectors!Chris has...
03/06/2026

Chris in yesterday with his Stage 3 Fiesta ST, changing from X47R to Turbo Technics S280A and bigger injectors!

Chris has been lucky if you judge the reputation of hybrids in recent times, as they have become increasingly unreliable and inconsistent in quality, a shame as they used to be a solid choice.

He had done around 30k on the unit and its still in good shape, but he wanted more from the car, so that's what we gave him!

S280A with development actuator to our spec.
Bosch Larger injectors

Boost level retained as before at 1.65 bar peak

TRS calibration optimised to suit the S280A and stronger actuator, rescaled for injectors.

Everything else remained the same, with Airtec Stage 3 intercooler and induction, Forge recirc valve etc.

I will stress we did not push this to the limit - We could add more boost, but for his track work we kept it sensible.

End result - A solid 335bhp @ 7000rpm, still going! The long pulls on the Maha are harsh, and it was particularly humid in the workshop at Autoculture Tuning - AC Tuning, so to keep the stress and heat down, we stopped the run a little early.

A slightly cooler day and revved out to the rev limit, there's a 340bhp in the bag but that doesn't matter, a stunning torque curve and a significant increase in performance over the hybrid unit without lots of boost and timing, it simply backs up our approach we apply to all our cars.

A great customer with expectations exceeded, that's what we like!

If your engine looks like this, we won't tune it.It's disappointing for the customer , and it's disappointing for us tur...
30/05/2026

If your engine looks like this, we won't tune it.

It's disappointing for the customer , and it's disappointing for us turning a car away.

But honesty is the best policy.

This one turned up on Friday for Stage 2 tuning.

Not only did it have cracks in no.2 and 3, compression was low in no.4, the rocker cover gasket was pouring out into the spark plug wells, a breather pipe was split, heat shields missing , and suspiciously high coolant level were all red flags that could not be ignored.

We take a deposit on all jobs, and in this case , it covered our time to healthcheck the car before we tuned it.

We still lost out. It's business . It's how it goes.

But the customer is now aware his recent purchase is not really economical or viable long term, and is unlikely to be throwing money at the car and ending up in a worse situation.

It sucks . I have to be the one to break the news and I hate it, but we won't be making things worse by tuning to a higher level. Integrity above all else.

Address

Unit 15 Drayton Industrial Park, Taverham Road
Norwich
NR86RL

Opening Hours

Monday 8:30am - 5pm
Tuesday 8:30am - 5pm
Wednesday 8:30am - 5pm
Thursday 8:30am - 5pm
Friday 8:30am - 5pm

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