Chris32
07-05-2016, 04:38 AM
Hello,
I have a Nissan S14a with SR20DET (T28 turbo, 2.5" exhaust, FMIC, horsham stage 1, walbro 255).
The problem is that the boost drops from around 5700 rpm from 1 bar to around 0.7 ar redline (the car was holding 1.1 until 7500 rpm before).
I checked until now for boost leaks, FPR, changed knock sensor, hard wired the fuel pump (this made a small difference), checked AFM, lambda, timing, still the same problem. There is no smoke on the exhaust. I am thinking of replacing the fuel pump next.
Also the problem is kind of intermitent. On rare occasions, the car is running fine.
Before hard wiring the fuel pump, I had a injector duty cycle of 107%, after that it dropped to 98% (it reaches these values for a fraction of a second just when it hits full boost, not when the boost is starting to drop).
What else could it be? Any ideas are welcomed :)
Thanks!
I have a Nissan S14a with SR20DET (T28 turbo, 2.5" exhaust, FMIC, horsham stage 1, walbro 255).
The problem is that the boost drops from around 5700 rpm from 1 bar to around 0.7 ar redline (the car was holding 1.1 until 7500 rpm before).
I checked until now for boost leaks, FPR, changed knock sensor, hard wired the fuel pump (this made a small difference), checked AFM, lambda, timing, still the same problem. There is no smoke on the exhaust. I am thinking of replacing the fuel pump next.
Also the problem is kind of intermitent. On rare occasions, the car is running fine.
Before hard wiring the fuel pump, I had a injector duty cycle of 107%, after that it dropped to 98% (it reaches these values for a fraction of a second just when it hits full boost, not when the boost is starting to drop).
What else could it be? Any ideas are welcomed :)
Thanks!