10/27/2025
This one is a long story; this client came in to confirm his suspicions that something on the car wasn’t right, so he wanted to get the car on the dyno and see what it does and get my opinion on what it could be and what can be done to improve it, so after a very disappointing dyno pulls, it very obviously the many things were not right, starting by just looking and the power graf and seeing how boost spikes ( dangerous on stock rods) and the drops in it face, besides that the client hated how the car je**ed consistently during cruising around 50-60 mph, a car that should be fun to drive was kept in the garage because of the issues.
Just by looking at everything we saw many red flags, horrible vacuum hose routings, many plastic tees with huge restrictions delaying one of the most important sensors for a turbo car, the map sensor, which can be seen on the photos, also a kinked hose due to the wrong way routed for the boost gauge which delayed the boost control actuation and gauge readings.
Another mistake was using the manifold pressure to feed the boost control selenoid when it is 5 feet away delaying the waste gate action further when there is an boost outlet provided in the Borg Warner EFR turbo 6 inches away from the waste gate.
So the client gave me the go ahead and fix everything, so we installed a simple yet very effective vacuum block to get manifold pressure signals everywhere without delaying its response, the only tee used is a copper barbed tee with 3/8 diameter not restricting anything.
Another one i am not going to pass on it is that I spent hours on the tune figuring out which MAP sensor this car had since the customer didn’t know, so by the looks of it had a stock sensor which shouldn’t be because its a boosted car, the map sensor sits between the back of the intake manifold and the fire wall so it is not easy to reach it or see it, so i tried putting a 3 bar map sensor scaling on the tune and it was very close, so i decided to remove the sensor, to my surprise the sensor was not connected, the map sensor harness was cutted and a GM 3 bar map sensor was wired to it, why would you do that when 3 bar map sensors that bolt up directly to the stock location and connector exists!
Anyway, we went ahead and tuned the car giving it a safer torque output with more power at less boost than what it had on the previous tune, you can definitely see the difference on both before and after on the dyno graph, no more jerking during cruising speeds, very responsive, linear and controlable power, the customer was exited that he got his fun car back, there is a 4 minute video him enjoying his car and thanking us for our work and knowledge!
Please public, stop using china spark plug coils, not good!