Power Enrichment Delay Issue
Power Enrichment Delay Issue I've done a bunch of searching and I can't seem to figure out what would cause this....
I have a 2004 Corvette with MS3 cam, PRC Stage 2.5 ported LS6 Heads, LS6 intake, full exhaust. Well, when you floor the car, the throttle position goes directly to 100%, but the car still holds a 14.7 AFR or so for about a second after being at full throttle (this happens at all RPMs as well, no matter whether 1500 or 5000). You can physically feel the car pull 3 times harder once the enrichment enters and the AFR goes to 12.8. I have a wideband as well and it can be seen on there as well.
I made some changes to the tune last night with hopes they would help, but they did not. I can post up a tune and a log after work, but what I'm describing is exactly what it is doing. O2 will continue oscillation (100-900 mv) for about 1 second after throttle position is 100%. Power Enrichment settings are:
Power Enrichment Enable MAP: 70 kPa
MAP Hysteresis: 5 KPA
Delay RPM: 100
RPM Hysteresis: 10
Enable Torque: 100%
Torque Hysteresis: 15%
My throttle position enable is even lowered to 45% from 1K RPM to 3.8K RPM, then one 33% block, and then 22% after that.
Enrichment rate is 1.7500 (but 1.000-4.000 all should enrich at an instant rate correct???). I tried 1, 2 , 3, and 4 with no change.....
I'm just lost. Everything is there and Power Enrichment is still delayed. I also have an 04 GTO with the same power enrichment setting and it instantly goes into PE.
I have a 2004 Corvette with MS3 cam, PRC Stage 2.5 ported LS6 Heads, LS6 intake, full exhaust. Well, when you floor the car, the throttle position goes directly to 100%, but the car still holds a 14.7 AFR or so for about a second after being at full throttle (this happens at all RPMs as well, no matter whether 1500 or 5000). You can physically feel the car pull 3 times harder once the enrichment enters and the AFR goes to 12.8. I have a wideband as well and it can be seen on there as well.
I made some changes to the tune last night with hopes they would help, but they did not. I can post up a tune and a log after work, but what I'm describing is exactly what it is doing. O2 will continue oscillation (100-900 mv) for about 1 second after throttle position is 100%. Power Enrichment settings are:
Power Enrichment Enable MAP: 70 kPa
MAP Hysteresis: 5 KPA
Delay RPM: 100
RPM Hysteresis: 10
Enable Torque: 100%
Torque Hysteresis: 15%
My throttle position enable is even lowered to 45% from 1K RPM to 3.8K RPM, then one 33% block, and then 22% after that.
Enrichment rate is 1.7500 (but 1.000-4.000 all should enrich at an instant rate correct???). I tried 1, 2 , 3, and 4 with no change.....
I'm just lost. Everything is there and Power Enrichment is still delayed. I also have an 04 GTO with the same power enrichment setting and it instantly goes into PE.
Its just a commanded rate. .0001 being slowest enrichment and 1 supposed to be instant. Applies to all RPMs. I have used a little bit of delayed PE in Speed Density tunes before for cars that were a fuzz fat on the transient fueling.
There is not in HPTuners unless I'm completely missing something. There is a pedal position table, then MAP enable, and RPM delay (below that RPM, PE is delayed for the time specified delay rate in the scalar).
Guess that is one more reason to go on my growing list of why EFILive is better than HPTuners... The table I am talking about is exactly your problem - I am attaching a screen shot of the table from a 2004 vette - you can see it is set at 1 second...
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I ended up finding the issue though. I got a P1637 on the way home from work last night for an Generator L Circuit failure code. Alternator never died or acted up though. Well, I wanted to make sure all wires were good so I popped the computer out and tested continuity in the wiring harness, checked out good....
So I was putting the PCM back in and found a vacuum line just dangling with nothing on it. So I fixed that and so far everything has been good. I get ~200 ms reaction time, but I would call that normal with this cam. I don't feel a stumble at all anymore at low RPMs either.
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Verdad Gallardo Glad you figured it out! Just so you know - the table I posted was a stock table - we always change it from 1 second to bring PE in instantly (when the other parameters are met)... I have always hated the differences in table labeling between software programs - makes things confusing in an environment like this.
