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redross17 Total posts: 3600
Brian Ross2004 Grand Prix GTP CompG Joined: 11 Dec 2003 Location: Buffalo Age: 48 |
 Posted: Tue Jul 05, 2005 11:21 pm Post subject: Yet another A/F tuning thread |
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Ok, so I have my DHP 1.5 code (via Powrtuner), 180* t-stat, -1 heat range plugs, 3.4" pulley, and an open cone.
I've been collecting scans over the past few days, and tried to neaten them up a little bit:
HTML:
http://www.golfandbeer.org/files/GPscanlogs/html/20050630-0919.html
http://www.golfandbeer.org/files/GPscanlogs/html/20050630-1645.html
http://www.golfandbeer.org/files/GPscanlogs/html/20050630-2005.html
http://www.golfandbeer.org/files/GPscanlogs/html/20050705-0849.html
http://www.golfandbeer.org/files/GPscanlogs/html/20050705-1710.html
CSVs: http://www.golfandbeer.org/files/GPscanlogs
Thoughts? Most importantly, is there any call for major changes before hitting the track tonight? 
I like the KR, at least for not having fine-tuned anything. I understand that the O2 readings should be ~20-30mv lower @WOT, and the LTFTs somewhat higher while cruising. Both should be affected (in a desirable fashion) by dropping my MAF g/sec or, injector flow rate msec/g in the PCM, correct? Is one table preferred over the other? I have an AFC-to-g/sec converter (thanks for that cartechpr thread, Shawn!), so that might be easier. And I'm a little confused as to why my LTFTs jump negative when advancing in gears...
Thanks!
Brian
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2018 Acadia
Retired: 2014 ATS, 2004 GTP |
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| 2fast4U Total posts: 1113
Gary2001 Regal GS Joined: 28 Dec 2004 Location: Niagara Falls, NY Age: 53 |
| Posted: Wed Jul 06, 2005 5:18 am Post subject: |
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damn Brian - that looks even richer than mine was! What is your PE base vesus ECT set to? You can lean it out in SMALL amounts using the Add vs RPM table under PE.
I wouls really like to see some screen caps of your tune...Any chance you could grab some and email them to me?
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| Larry Total posts: 2201
Larry H.2001 Grand Prix GTP Joined: 01 Oct 2003 Location: Rochester, NY Age: 47 |
| Posted: Wed Jul 06, 2005 7:35 am Post subject: |
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| Why is the injector pulse width so high during WOT? |
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| redross17 Total posts: 3600
Brian Ross2004 Grand Prix GTP CompG Joined: 11 Dec 2003 Location: Buffalo Age: 48 |
| Posted: Wed Jul 06, 2005 7:36 am Post subject: |
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| 2fast4U wrote: | | damn Brian - that looks even richer than mine was! What is your PE base vesus ECT set to? You can lean it out in SMALL amounts using the Add vs RPM table under PE. |
-40*F: 9.65
-22: 11.14
-4: 11.6
14: 11.6
32: 11.6
50: 11.6
68: 11.95
The above is stock, then at 86*F and up, it's 11.8. |
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| Greystar Total posts: 1313
Pat2002 Other Car Joined: 04 Feb 2004 Location: NC Age: 93 |
| Posted: Wed Jul 06, 2005 10:21 am Post subject: |
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| You need to dial in your fuel. Your LTFT's are way out of whack. Have you been putting the motor in SD mode when you scan? |
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| redross17 Total posts: 3600
Brian Ross2004 Grand Prix GTP CompG Joined: 11 Dec 2003 Location: Buffalo Age: 48 |
| Posted: Wed Jul 06, 2005 11:00 am Post subject: |
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| Greystar wrote: | | Have you been putting the motor in SD mode when you scan? |
SD mode? |
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| Greystar Total posts: 1313
Pat2002 Other Car Joined: 04 Feb 2004 Location: NC Age: 93 |
| Posted: Wed Jul 06, 2005 11:39 am Post subject: |
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| redross17 wrote: | | Greystar wrote: | | Have you been putting the motor in SD mode when you scan? |
SD mode? |
Sorry, Speed Density. Disabling the MAF and letting the computer run the motor using the MAP sensor instead of the MAF. It makes for more accurate logging (with LS1's at least, I can't see it being any different with the L67). |
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| 2fast4U Total posts: 1113
Gary2001 Regal GS Joined: 28 Dec 2004 Location: Niagara Falls, NY Age: 53 |
| Posted: Wed Jul 06, 2005 5:01 pm Post subject: |
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| Greystar wrote: | | redross17 wrote: | | Greystar wrote: | | Have you been putting the motor in SD mode when you scan? |
SD mode? |
Sorry, Speed Density. Disabling the MAF and letting the computer run the motor using the MAP sensor instead of the MAF. It makes for more accurate logging (with LS1's at least, I can't see it being any different with the L67). |
I have been at it ALL day. I finally got all of the LTFT's between -1 & +2, right up until I reconect the MAF. Then it all goes to hell in a handbasket! They all go back to -19, -12, so forth...Do I have to scale the maf table in some manner in order to keep the LTFT's in line? |
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| Greystar Total posts: 1313
Pat2002 Other Car Joined: 04 Feb 2004 Location: NC Age: 93 |
| Posted: Wed Jul 06, 2005 10:32 pm Post subject: |
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| 2fast4U wrote: | | I have been at it ALL day. I finally got all of the LTFT's between -1 & +2, right up until I reconect the MAF. Then it all goes to hell in a handbasket! They all go back to -19, -12, so forth...Do I have to scale the maf table in some manner in order to keep the LTFT's in line? |
It sounds to me like you're never entering SD mode, so your numbers are skewed. Instead of just unplugging the MAF, go in and under your general general diagnostics set your MAF Sensor Fail Frequency to 0 (in hptuners anyways, but any other editor should have a that option although it may be in another place). |
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| redross17 Total posts: 3600
Brian Ross2004 Grand Prix GTP CompG Joined: 11 Dec 2003 Location: Buffalo Age: 48 |
| Posted: Thu Jul 07, 2005 12:08 am Post subject: |
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Well I think after tonight I'm going to split my PCM code to my daily-driver version, and a race-version. The first difference being the absence of ALL torque management in the race-version. The DD version will have it to save the car from me being stupid. Tonight, my LTFTs at WOT were mostly -4.7 until (apparently) timing was pulled by TQM (when going to 3rd gear), at which point it would jump to -11.7. I'd like to see what happens w/o TQM. Scans will come later.
Of course I didn't scan my best run, but I do have one for my second best run, which was my first of the night: 14.461@95.90, 2.175 60' (88RH, 78*F).
My best run was 14.367@96.17, 2.165 60' (100RH, 73*F). I might need a helmet if I can do a little more tweaking and drop that 60' under 2.0.  |
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| Greystar Total posts: 1313
Pat2002 Other Car Joined: 04 Feb 2004 Location: NC Age: 93 |
| Posted: Thu Jul 07, 2005 12:35 pm Post subject: |
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| redross17 wrote: | Well I think after tonight I'm going to split my PCM code to my daily-driver version, and a race-version. The first difference being the absence of ALL torque management in the race-version. The DD version will have it to save the car from me being stupid. Tonight, my LTFTs at WOT were mostly -4.7 until (apparently) timing was pulled by TQM (when going to 3rd gear), at which point it would jump to -11.7. I'd like to see what happens w/o TQM. Scans will come later.
Of course I didn't scan my best run, but I do have one for my second best run, which was my first of the night: 14.461@95.90, 2.175 60' (88RH, 78*F).
My best run was 14.367@96.17, 2.165 60' (100RH, 73*F). I might need a helmet if I can do a little more tweaking and drop that 60' under 2.0. |
Ahh! That explains it. See I didn't realize that your car had Torque management. Disable it for tuning purposes. |
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| redross17 Total posts: 3600
Brian Ross2004 Grand Prix GTP CompG Joined: 11 Dec 2003 Location: Buffalo Age: 48 |
| Posted: Thu Jul 07, 2005 1:49 pm Post subject: |
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| There's that, and I found something regarding the PE_RPM_vs_TIME_A/F table that I'm going to try. |
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