Originally Posted by DinavaWRX
I just put a new boost controller in my 05 wrx and everytime i hit higher than about 18-19 psi my check engine light comes on and the engine cuts out. How do i remove that limiting function of the ECU? Thanks let me know asap.
Why you'd even want to do this is beyond me, but here goes.
You can do this with aftermarket engine management. Another way to do this would be to install the FCD from HKS. TurboXS makes one too. This will allow you to control the onset of fuel cut. This is something that someone with a good amount of tuning experience would use, not someone that isn't very familiar with the ECU and what it does.
I'll give you the short and sweet on what happened and why it did.
You experienced fuel cut. Fuel cut is cessation of fuel delivery and spark generation by the ECU. It is a pre-programmed response designed to save the turbocharger from utter destruction in the event of a catastrophic wastegate malfunction.
I'll add this as well. Your car is not set up to run at those boost levels. You're not gaining any more power by running that much boost on the stock turbo, fuel system, etc.. You're more than likely losing power if anything. This would be due to pulled timing from knock/detonation. You should really have some type of engine management/logging tools to see what you're actually doing instead of just throwing a boost cotroller on there and twisting it up.
I would tell you to take the mbc off the car and let some aftermarket EM control boost for you.
Well, unless you want to blow your engine up.