Strange car?

[wangboy925]

I got my evo3 16g, FP2s cams, 16 psi, stock 450cc inj, stock FPR, and unknown fuel pump. Well I did a WOT run while having a friend look at my datalogger and he saw no counts of knock while keeping 10.00 on the wideband O2. I know I could push the car up to 18psi without any problems but I dont wanna risk blowing something up. Could my stock fuel system (with unknown fuel pump) run this much psi and still be in the 10s A/F ratio? I feel like the whole car is being weird on me and tricking me or something.


p.s. on SAFC WOT throttle points throughout the whole RPM all read below 5%

 

[1stGenTSi]

Have you checked for boost leaks? Where is the wideband o2 sensor mounted?

 

[anteversion]

first, 10;1 is way too rich and make your fuel system to inject more fuel than necessary at any rpm during a wot operation, which will cause you to hit fuel cut before you were supposed to do. Tune it to get around 11.5 at 12:1.

 

[wangboy925]

No boost leaks b/c I hold 15-16 psi real steady and the wideband sensor is about 3 feet from the turbo.

 

[->PrOjEcTGS<-]

No boost leaks b/c I hold 15-16 psi real steady and the wideband sensor is about 3 feet from the turbo.

That is no way to tell if you have boost leaks or not. Your turbo is more than capable of keeping your boost level at 15-16psi with a couple of leaks. If you do in fact have a couple of leaks though you will be running rich like you are and taxing your intercooler's efficiency.

Also I bet you are running out of fuel up in the higher RPMs.

 

[wangboy925]

But do you guys think its possible to run 15-16psi on an evo3 16g on stock fuel system without maxing anything out. I heard 14psi is the limit with stock 14b and stock fuel. But with my car I think my fuel system can go further. But I dont even think just a fuel pump upgrade can net me over 16psi.

 

[90laserRSfwd]

I have a log somewhere @ 21 psi(have to check the laptop).. 14b turbo, stock 450's, wally 190 pump. The inj. duty cycle logged (dsmlink) was 123%

 

[spyderturbo007]

first, 10;1 is way to rich and make your fuel system to inject more fuel than necessary at any rpm during a wot operation, wich will cause you to hit fuel cut before you were supposed to do. Tune it to get around 11.5 at 12:1.

Yep, great idea, tune for an AFR of 12:1.

Running just pump gas with a 12:1 AFR and your car might last for a week. DSM's like to run an AFR right around 11:1.

Can you post up one of your logs along with your SAFC correction factors? Right now the injectors are going to be the weak link. The key here is going to be knock and IDC. With cams, you're going to be flowing more air than someone running stock cams, so your boost pressure is going to have to be lower.

 

[propeine]

I have a log somewhere @ 21 psi(have to check the laptop).. 14b turbo, stock 450's, wally 190 pump. The inj. duty cycle logged (dsmlink) was 123%

That means your injectors were never closed. Extremely hard on injectors and being over %100 percent means that really you weren't injecting the amount of fuel that the computer thinks you were. I would definitely like to see that log.

 

[->PrOjEcTGS<-]

Take a look at your fuel trims and tell me what they are:

LOW
MID
HIGH

That will give me an idea as to whether you have a boost leak or not.

 

[wangboy925]

Ill see what I have for fuel trims and IDC tomorrow.