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See attached log. This is going lean on tip out, rich on tip in. How would you fix it?126056126057

Scott:
I am running a cam with 8 degrees of overlap (228/232 .600/.612 111+3) in a 2000 C5 M6 with 243 heads, LS6 intake, long tubes, vararam, etc. This cam is a custom grind from Cam Motion but...

Suggest that you increase the Proportional Idle O2 Error. Mine starts a 1.0 and increases to 2.0 (the max permitted value). Increasing the value makes the ECM vary the fuel more dramatically at idle...

Hi Bill: Any update on when you expect a fix to be in place? I don't want to permanently stop updates from Windows. Thanks.

Thanks Matt. I will have a go at it and post results back. Will be about 10 days until then, on the the road at the moment.

Anyone?

I should add that in the second KR sequence (27:30) the timing is at 19.1 degrees when the KR kicks in, this is not during a shift, just a WOT pull in 3rd. In Matt's revised timing tables this would...

Thanks Matt. Most interesting is that in the peak torque cells (4400 - 4800 rpm, max cyl airmass) you have increased the timing from 18 to 22 degrees. I am trying to understand... In viewing in the...

2000 C5 Corvette M6, 228/232 111 +3 cam, LT headers, FAST 36 lb injectors. I think I am getting close with the tune but am still battling some KR at WOT.

See attached log at around 13:30 and again...

Mass Airflow is what the MAF is measuring as the actual airflow through the engine. Dynamic airflow blends in the VE table value with the MAF input when dynamic airflow is enable. Base running...

As a start increase the Base Running Airflow (Idle Airflow) across the board by about 1 g/s and be prepared to increase it more if required. Decrease idle timing (Idle spark advance) to the mid 20...

Just curious why there wouldn't be active KR if there was too much timing?

I think you are going to need larger injectors. Log shows up to 125% injector duty cycle. Normal recommended limit is 80%. Might be ok if just using on the street, but if you do HPDE, etc then you...

Finally realized that the most of the knock was occurring at 50kPa MAP (only loosely coupled to RPM and cyl airmass). So increased the Knock Sensor Global Gain at 50kPA from 1.25 to 2.00 (thus...

New tune file.

Interesting about the GMT530. I don't think this was changed since I went back and checked a stock 2000 Corvette tune file and it was set as GMT530. Not sure if the stock file I have is corrupted or...

Updated tune with revised timing. We shall see how this works on the dyno today.

AF dialed in best I can at this point. Still have some issues with lean/rich oscillation of AF ratio when shifting, and rich on 0% throttle decel (not so worried about this). I think the lean/rich...

Also, this is running on 91 octane gas from Costco. It is advertised as 0% ethanol.

2000 M6 Corvette with 228/232 111LSA +3 cam, LT's, 243 heads and 0.040" head gaskets (approx. 10.8 comp), FAST 36 lb injectors using GTP data. Tune and log attached. Getting knock in multiple...

A few things jump out at me:
- main spark tables are disabled at a very low speed (engine, spark, base, max speed). Not sure why you would want this. Suggest setting this value to something high...

A few things jump out at me:
- main spark tables are disabled at a very low speed (engine, spark, base, max speed). Not sure why you would want this. Suggest setting this value to something high...

Thanks Kevin. Yes, DFCO could be used to cut fuel aggressively by adjusting MAP and RPM enter/exit levels. I was hoping for a more elegant solution? I am intrigued by your "mostly normal" comment -...

Tune and log files attached. Going lean/rich/lean with each upshift. And goes rich on deceleration. Any other issues that you see?

2000 M6 Corvette with cam, CAI, LT's, FAST 36 lb injectors.
...

May have found the issue. In the VE Tune file the LTFT are disabled, but the Min ECT to enable LTFT learning is set above the Max ECT to enable LTFT learning. This may have confused the PCM as the...