Well I have a 03 mach1 but it has a cobra tank and pumps with 80 lbs injectors and jms bap. The car is a 76mm turbo car with forged low compression shortblock and built c4. My problem is on the dyno during a pull the fuel pressure stays flat in the 43-45 psi range until it gets into boost good then it drops straight down to 13-15 psi. Lucky we were able to let off the throttle in time to not hurt anything. I ran the car with stock motor and turbo on 11#'s and didn't have this issue with cobra pumps and 39lbs injectors. Has anyone ever had a issue like this before. I know the cobra pumps are not ideal but thought it would be OK on low boost with jms. Any input would be great! Going to drop tank friday and see if there is anything that stands out.
fuel pressure drop issue?
- Thread starter 4.6pimp
- Start date
Sounds like you need bigger pumps. On my car and a friends cobra we ran out of pump close to 550rwhp and we both had the BAP's. Didn't the tuner tell you that? What was you duty cycle on the 39's.
Duty cycle with the 39 lbs injectors was damn near 100% if not 100%. 526 @ the wheels.
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