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View Full Version : 2000 SS CALC.VET Tune - Running Scary Lean at WOT



kmracer
April 23rd, 2018, 04:37 PM
All,

I am working on tuning my 2000 SS. Car has a lid, stock MAF, FAST 92/92, Stock injectors, MS3 Cam, 1 3/4" kooks into 3" True Duals. I am running an AEM 30-0300 via the analog input. Getting the car running right has been a challenge - it had been sitting for 6 or 7 years. I've done a ton of mechanical to ensure the car is running how it should - fuel filter, plugs, fixed airbox issues, tightened intake bolts, all fluids, compression test, etc.

Worth mentioning that I could not get the AEM AFR pid to match the AFR displayed on the gauge, I found the voltage at EXT.1 to be .45v off of the displayed voltage, so I edited the CLC-00-050 formula to reflect that. Now AEM AFR matches.

So here's where I am at:

Before getting started with WOT tuning, I've noticed WOT AFR's to be high - between 13.4 and 14.0:1. I've done RAFIG tuning to cure much of the stalling and bucking, but it still needs work, which I am hoping CALC.VET process can help with. In any case, I haven't been beating on the car as a result of WOT AFR being so far off. I've also done all preliminary tuning - changing fan speeds, eliminating CEL's, egr, etc. I also followed the guide, editing the B0701 through B3609. As you can see in my Calc.pid file, my OS doesn't have GM.DYNAIRTMP_DMA, so I am using CALC.B4901 in my calculations instead.

I went to log calc.vet and things seemed to be going well until I did a WOT pull, which can be found at 18:22:50, and I saw AFR's shoot up to 16-17:1. Somewhat baffled, I went in and changed PE settings from setting all rows to 1.16 to the stock table, which is what is found in the tune now. I did another pull and found AFR's to still be high, between 13.4 and 14:1.

How do I make sure I don't burn up the motor during the tuning process? Why did AFR's go so lean when changing the PE settings as suggested in the guide? Also, can y'all help ensure I'm not missing anything else obvious in the tune?

I've included my tune, calc.pids file, log file, and a couple of screen shots of the dashboard filtered on WOT which show ARF's for the two WOT pulls.

Thank you all for help in advance.

joecar
April 24th, 2018, 04:29 AM
Are you running from MAF or VE...?

Did you disable VE (by setting B0120 to zero)...?

joecar
April 24th, 2018, 04:31 AM
In your calc_pids.txt, did you take the B4901 data from your tune file...?

I'll look thru your files.

kmracer
April 24th, 2018, 06:28 AM
B0120 is set to 400 RPM's, so yes, I suppose VE is disabled.

kmracer
April 24th, 2018, 06:29 AM
And yes, i took b4901 data from my tune file. Thank you for the quick reply Joe!

kmracer
April 25th, 2018, 02:54 PM
As an FYI I added 5% fuel to the PE table and got it down to 12.7-13.1 AFR's. It was a little lean down in the 3000-3750 range, so I added a little more fuel there and will retest and log tomorrow.

I found several threads to be helpful:

https://forum.efilive.com/showthread.php?2613-Power-enrichment-mode-explained-Please-)

https://forum.efilive.com/showthread.php?15461-Clarification-on-PE-enable&highlight=b3606

and of course, the notes thread:

https://forum.efilive.com/showthread.php?14188-Summary-Notes


Here are log and tune files:

22046

22047

joecar
April 25th, 2018, 03:19 PM
...
Here are log and tune files:

22046

22047I'll look thru your files later tonite...

joecar
April 25th, 2018, 03:24 PM
Which wideband are you using...?

joecar
April 25th, 2018, 03:25 PM
ok, VE table is not right...

kmracer
April 25th, 2018, 03:58 PM
Im using an AEM 30-0300. I added 5% to the VE at 90 KPa, and >3000 RPM just to ensure that I have fuel, but I now realize I didn't need to do that because im running on MAF only right now.

kmracer
April 25th, 2018, 04:03 PM
Are there other issues you see with the VE table? It's also all over the place because I haven't done much blending at this point. My next steps are to do a long calc.vet log focusing on hitting as many data points as possible. This is my first time runing the calc.vet process so there's a bit of a learning curve.

Here is another file with the stock VE table.

22048

joecar
April 26th, 2018, 03:50 AM
Ok, AEM 30-0300 connected in analog manner to FSV2, using offset-corrected CALC.AEM1 (from your calc_pids.txt posted above).

I'll take a look at your new tune.

A few quick questions:
- did you measure rail pressure....?
- do you have returnless system (FPR near fuel pump) or return system (FPR at rail)...?
- do you have stock injectors (ah, I see this posted above).