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Go Back   3800Pro.com Forum > Electronics > PCM's & Tuning

PCM's & Tuning Discussions regarding PCM's and tuning

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Old 12-13-2005, 04:01 PM
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Exclamation Tunning GURU's Needed **SCAN**

Okay guys, for a while I have been having some KR issues with my 3.4, i will try to keep it as short as possible.

1. My car will have anywere from 3-7* of KR at WOT with the 02's well in the 950+ range
2. I also have the stock timing table in my .bin right now
3. IPW look ok, anywere from 17-19 at WOT at speeds around 80mph
4. ITS FRICKEN WINTER IN WISCONSIN = I SHOULD NOT HAVE KR
5. Tried race gas (Torco) and it showed a max of 1* of KR, so yes it is real
6. Tried loading stock .bin file & had similar results.

I will try to get a scan up tonight, and will be more than happy to send anybody my current .bin & scan that would be interested in helping me out. Thanks Much!

~Biggie

Last edited by PacesettersPerformance; 12-14-2005 at 03:07 AM.
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Old 12-13-2005, 04:38 PM
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Can you post up the scan?
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Old 12-14-2005, 03:08 AM
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Here's the scan guys.
http://www.badongo.com/file.php?file...BIGGIESCAN.csv
~Biggie

Last edited by PacesettersPerformance; 12-14-2005 at 03:13 AM.
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Old 12-14-2005, 02:11 PM
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I'm by no means a tuning guru, but I'll offer up my $.02.

I see that you list a miniAFC in your mods. Are you presently using it to skew the MAF? With the HPT I'd think that you'd be able to remove it from the mix.

Where have you done most of your fueling tweaks so far? I'd think that your IFR table would be fine left stock and maybe just some minor adjustments to the upper end of the MAF table to account for the ported TB. Have you lowered your PE enable threshold? Stock is around 45% for RPMs below 4000 and you may benefit from getting into PE sooner. If you edit the PE enable table, don't forget to scale back the PE adder vs TPS table as well (don't want to go too lean when you enter PE). After that, I'd take a closer look at the PE vs. RPM vs. time table. By referencing your scan data (and knowing when and how long you've been running in PE) you can increase fuel delivery for 'problem areas' in your run (this is where scanning the commanded AFR is helpful).

Which timing (high octane) table are you using (stock, DHP, Intense)? If you are still getting some KR after the fuel tweaks, you could drop the timing back a degree.

The LTFT's look to vary a bit in your scan (high negatives with light throttle and high positives at WOT). Is this behavior about normal for your car?

One last item to note about the scan, avoid going WOT when the engine is not up to temp (>160). You don't want to risk damaging the engine unnecessarily. The first two WOT runs in the log show no KR at all, but once the engine temp got above 160, it showed up.

You may also want to add MAF Freq (Hz) to your scanner and maybe commanded AFR.

Hope this info is of some help.
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Old 12-14-2005, 03:07 PM
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I would throw a 160 t-stat in and re-scan. Your upper end MAF skew is messing with the commanded PE AFR for sure. You need to lower your PE target to get your LTFT's at 0.
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Old 12-14-2005, 04:07 PM
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Thanks for the help & advice guys, I will try to anwser as many questions as I can

I am not actually using my AFC any more, I havn't since I got my PEMs about 3+ months ago, sorry for the confusion. The majority of my fueling tweaking has been done in the PE vs. RPM table, and some within the MAF just to help the ported tb best I can,

Quote:
Have you lowered your PE enable threshold? Stock is around 45% for RPMs below 4000 and you may benefit from getting into PE sooner. If you edit the PE enable table, don't forget to scale back the PE adder vs TPS table as well (don't want to go too lean when you enter PE). After that, I'd take a closer look at the PE vs. RPM vs. time table.
I have not lowered my PE enable threshold (not sure what to change it to), I also have not scaled back the PE adder vs. TPS table, I have been trying for many months on trying to figure out how to tune, but I'm not getting the hang or knowledge of it yet . . . I have been told that my LTFT is the main part of my problem and that i need to get them closer to 0, once agian, not sure how to do it, I have tried many times to log the AFR via HPTuners, and it never works, and never has.

If you would like to take a look at my current .bin file I would be more than happy to send it to ya,
~Biggie
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Old 12-14-2005, 05:24 PM
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Sure. Host it up and I'll look it over.
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Old 12-14-2005, 05:58 PM
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I would definately address the lean condition when you're getting knock. Check the fuel system first to make sure all the hardware/parts are right before going and tuning something in. Fuel filter changed recently? FPR good? vacuum leak? things like that. just food for thought.
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Old 12-14-2005, 06:40 PM
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The fuel system is good, i just got done (within last 2 months) replacing the fuel filter & putting in a Walbro, I tested the fuel pressure and it read 52psi, at the time of that scan I didn't have a vacuum leak, (i do know, it will be fixed later this week) I know that i didn't have one then but do know, because one of my vacuum lines accidently got broken off when I was working on the car. . .

Heres my .bin file
http://www.badongo.com/file.php?file...-14_101395.bin

~Biggie
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