Can't turn up boost? too rich maybe?

[Gamble97]

So, I've had my car at 11-12psi for a while for the break-in. I tried to turn up the boost, but if I turn it up any say 15psi and I get into boost the car sounds like it's spitting spark, or that it's wayyyyy too rich. My uego is not working at the moment so, how can I figure out what it would be?
I have dsmlink and I would think that if you turn up the boost that the ecu would adjust if it sees more air.
Anyone else have this problem?

 

[oldman]

I have dsmlink and I would think that if you turn up the boost that the ecu would adjust if it sees more air.

It's not the ECU that make adjustments to fuel delivery under boost, it's the 1:1 rise rate fpr. Are you knocking? What size injector, which turbo, airflow reading and IDC when problem happens?

 

[Gamble97]

They are 850cc injectors, I have the full throttle speed fpr. I have dsmlink set to blink the CEL light if knock is over 3degrees and it doesn't come one. Turbo is a gt3561.
I don't have a log of when it does that, but I can tomorrow.
It wouldn't be any type of boost leak, would it?

Also, how do you know that your fpr is a 1:1. I know they are all made for that, but is there a way to check? Also, for fuel I have a walbo 255, SBR fuel feed line and new OEM fuel filter.

 

[oldman]

It wouldn't be any type of boost leak, would it?

I like teaching smart students. With 850s at 15psi, you shouldn't see more than 50-60% IDC, If your IDC is way high, it would be a clear indication of boost leaks.

Also, how do you know that your fpr is a 1:1. I know they are all made for that, but is there a way to check? Also, for fuel I have a walbo 255, SBR fuel feed line and new OEM fuel filter.

The FTS fpr is an 1:1 fpr. To check if it's rising 1:1 properly, power up the fuel pump via Link - miscellaneous - fuel pump, disconnect the fpr vacuum line from the intake manifold, apply pressure air to this line (assuming your boost gauge is also tapped to this line, compare your boost gauge to your fuel gauge, make sure that for every 1 psi increase on the boost gauge results in 1 psi increase on your fuel gauge. If you didn't taflon your fpr vacuum fitting and adjustment rod, they are probably leaking.

 

[Gamble97]

I like teaching smart students. With 850s at 15psi, you shouldn't see more than 50-60% IDC, If your IDC is way high, it would be a clear indication of boost leaks.


The FTS fpr is an 1:1 fpr. To check if it's rising 1:1 properly, power up the fuel pump via Link - miscellaneous - fuel pump, disconnect the fpr vacuum line from the intake manifold, apply pressure air to this line (assuming your boost gauge is also tapped to this line, compare your boost gauge to your fuel gauge, make sure that for every 1 psi increase on the boost gauge results in 1 psi increase on your fuel gauge. If you didn't taflon your fpr vacuum fitting and adjustment rod, they are probably leaking.

Last I checked my IDC's were not higher than 60-62%. Thanks for the tip on the FPR, I will try that. I did not use teflon tape on the FPR for the gauge, it's not leaking, at least to to the naked eye. I think I used some blue lock tight though. Would teflon tape be better?

I know that I have my base fpr set as close to 43.5 w/o vacuum, but these gauges are terrible, they don't have very distince lines per 5psi.

edit: I will try to do a boost leak test tomorrow, and post up my findings.

 

[oldman]

I did not use teflon tape on the FPR for the gauge, it's not leaking, at least to to the naked eye. I think I used some blue lock tight though. Would teflon tape be better?

I'm not talking about the gauge, gauge is connected to the fuel chamber of the FPR, I'm talking about the boost reference fitting and the adjustment rod, which are connected to the air chamber of the fpr.