E38 Hard Limits? Hitting a brick wall at 7059RPM???

[Meister]

2010 Camaro
Whipple Supercharger @ 9psi
Custom Cam w/ Necessary Valvetrain Upgrade
Necessary Fuel System Upgrades

For diagnostic purposes I have turned off the rev limiters, torque management, speed limits, maxed out the diagnostic parameters for MAF, MAP, ETC and right at 7059rpm the engine hits a brick wall. The car is currently in maf only mode making 657RWHP on my MD

Any thoughts?

[GMPX]

How is it limiting? Fuel, Spark, ETC?

[swingtan]

normal first response.... post a log and the tune.....

[Meister]

I will shortly.....it is ETC related. I have turned off EVERYTHING I can

[GMPX]

Are you seeing the throttle position close when it hits the limiter?

[Meister]

I will post up the log....yes, right when this happens the throttle seems to be closing. With the delays in the logs it may be right when I do lift off.

[swingtan]

Sounds like TPS vs airflow rationality checks may be coming in to play. Are there any DTC's ?

Simon

[Meister]

Sounds like TPS vs airflow rationality checks may be coming in to play. Are there any DTC's ?

Simon

No DTC's. Where is the TPS .vs. airflow setting? I may have already maxed this all out

[swingtan]

C0803, C0804, C0805, C0806

these will trigger "reduced power" mode, especially on throttle close.

Simon

[Meister]

C0803, C0804, C0805, C0806

these will trigger "reduced power" mode, especially on throttle close.

Simon
That is what I thought.....those are all maxed out. This happens before lifting off the throttle. I stay in it and the engine just hits a brick wall. See the end of the run. This is with rev limit and everything else removed. Right at the end you can see it hit a brick wall while I am still on the throttle. Look at the other ETC values as it seems the throttle is closing

10932

[GMPX]

Is it the same in all gears? Or are you maybe hitting a speed limiter?

[kangsta]

in frame 604 just before the throttle starts closing, your MAF g/sec reads 655.35. It could be just the PID topping out at 0xFFFF or maybe an internal calculation limit. Did you try running mafless and see if it still does it?

[swingtan]

Also, the MAP data is locked on 120kPA, what is B8034 set to?

The MAF frequency is only at 10,500 HZ so it should be within range there, but kangsta's views on the actual gm/Sec values may be something. I'd want to check the max MAP values though. 120kPA is standing out and I think there is another thread about that value.

Simon

[gmh308]

What is the torque number when you hit the wall?

And did you touch B2501?

[68sstt]

My car was doing the same but at lower revs and set b0517 to no fixed most of my issues.

[Meister]

in frame 604 just before the throttle starts closing, your MAF g/sec reads 655.35. It could be just the PID topping out at 0xFFFF or maybe an internal calculation limit. Did you try running mafless and see if it still does it?

I will have to try this....someone suggested it but I really did not want to and dont feel I have to

[Meister]

Also, the MAP data is locked on 120kPA, what is B8034 set to?

The MAF frequency is only at 10,500 HZ so it should be within range there, but kangsta's views on the actual gm/Sec values may be something. I'd want to check the max MAP values though. 120kPA is standing out and I think there is another thread about that value.

Simon

That may be it....It is set to 105KPA but I have never had an issue on a blower car with this setting. To my understanding I have a error threshold of 22kpa

[Meister]

My car was doing the same but at lower revs and set b0517 to no fixed most of my issues.
This is already disabled

[Meister]

What is the torque number when you hit the wall?

And did you touch B2501?
This is set proper. The car is making like 580rwtq

[SPi]

What did you figure out on this Torq

[Meister]

Seemed to have fix it with a few cars pulling well beyond 7500. Will report shortly