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Thread: Bank to Bank Injector Base Pulswidth difference in open loop

  1. #1
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    Default Bank to Bank Injector Base Pulswidth difference in open loop

    Has anyone else seen this in their logs? Or are your Bank 1/Bank 2 identical? I am seeing up to 2msec bank to bank difference in OLSD.
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    2017 Camaro SS, 2014 Ram 2500 4x4 Cummins 6.7L, 2004 Chevy Avalanche Z71 4̶X̶4̶(now 2WD), 5870lb race weight, 10.93@ 124, Twin TVS1900s, Twin Throttle, 429 LSX, 4L80E, custom 14 bolt rear, V2, R̶o̶a̶d̶R̶u̶n̶n̶e̶r̶(dead), COS3......
    Gettin' the Groceries

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    I found an old log on here from back when I was using my Roadrunner PCM and different injectors .... the IBPW values were always identical in that log. That was before the RR went wonky and started doing odd things with fuel and timing. Maybe I have a third bad PCM? (The factory one died during a flash.) Going through a lot of licenses.

    Looking at some other logs I posted on here in 2011(https://forum.efilive.com/showthread...ght=roadrunner), it appears that the IBPW values have been non-identical at least since I've had the ID1000 injectors. So this has occurred with 2 different PCMs.
    Last edited by DrX; May 26th, 2015 at 01:04 AM.
    2017 Camaro SS, 2014 Ram 2500 4x4 Cummins 6.7L, 2004 Chevy Avalanche Z71 4̶X̶4̶(now 2WD), 5870lb race weight, 10.93@ 124, Twin TVS1900s, Twin Throttle, 429 LSX, 4L80E, custom 14 bolt rear, V2, R̶o̶a̶d̶R̶u̶n̶n̶e̶r̶(dead), COS3......
    Gettin' the Groceries

  3. #3
    Joe (Moderator) joecar's Avatar
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    Do you have a spare PCM to try on...?

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    Yes, I have a spare I can license. Will be testing this tomorrow.
    2017 Camaro SS, 2014 Ram 2500 4x4 Cummins 6.7L, 2004 Chevy Avalanche Z71 4̶X̶4̶(now 2WD), 5870lb race weight, 10.93@ 124, Twin TVS1900s, Twin Throttle, 429 LSX, 4L80E, custom 14 bolt rear, V2, R̶o̶a̶d̶R̶u̶n̶n̶e̶r̶(dead), COS3......
    Gettin' the Groceries

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    Did not bother to license another PCM today because the IBPW values were identical for a change. Only changes to the tune were some VE tweaks.
    2017 Camaro SS, 2014 Ram 2500 4x4 Cummins 6.7L, 2004 Chevy Avalanche Z71 4̶X̶4̶(now 2WD), 5870lb race weight, 10.93@ 124, Twin TVS1900s, Twin Throttle, 429 LSX, 4L80E, custom 14 bolt rear, V2, R̶o̶a̶d̶R̶u̶n̶n̶e̶r̶(dead), COS3......
    Gettin' the Groceries

  6. #6
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by DrX View Post
    Did not bother to license another PCM today because the IBPW values were identical for a change. Only changes to the tune were some VE tweaks.
    Ok, so it is not the PCM...

    but somehow it was calculating differently across banks, and now you threatened it with replacement so it is now conforming...

    Do you have any NBO2 connected (front or rear) even if not being used...?

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    Quote Originally Posted by joecar View Post
    you threatened it with replacement so it is now conforming...

    Do you have any NBO2 connected (front or rear) even if not being used...?
    Fronts are still connected. I have thought about unplugging them.
    2017 Camaro SS, 2014 Ram 2500 4x4 Cummins 6.7L, 2004 Chevy Avalanche Z71 4̶X̶4̶(now 2WD), 5870lb race weight, 10.93@ 124, Twin TVS1900s, Twin Throttle, 429 LSX, 4L80E, custom 14 bolt rear, V2, R̶o̶a̶d̶R̶u̶n̶n̶e̶r̶(dead), COS3......
    Gettin' the Groceries

  8. #8
    Joe (Moderator) joecar's Avatar
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    I'm wondering this: even tho CL/LTFT/trimming is disabled, does PCM find some reason to read the NBO2's (does it jump into some special mode)...?

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    Well, that didn't last....back to different fueling on each bank with Bank 1 richer than Bank 2 even though the Bank 1 IBPW is usually lower than Bank 2. At WOT with Bank 2 at commanded AFR of 10.84(NGK AFX), Bank 1 is 9's(LC1). Same thing with heat soaked idle... If Bank 1 is at commanded, Bank 2 is way lean or vice versa. Going to have to find some better injectors anyway because the duty cycle is maxed out on the ID 1000s if I shift at higher than stock shift points. I am also exceeding 512g/s on my 50% scaled tune.

    You will see in the log that I had to back off the throttle on launch because the transbrake wouldn't release. So, bad day at the track, but at least I collected some data.
    Here's the video that syncs with this log file. Stock shift points on this pass. If I run 6500 RPM shift points it shifts at 6800-7000 and crosses the line at the top of second.
    Attached Files Attached Files
    Last edited by DrX; July 12th, 2015 at 04:10 AM.
    2017 Camaro SS, 2014 Ram 2500 4x4 Cummins 6.7L, 2004 Chevy Avalanche Z71 4̶X̶4̶(now 2WD), 5870lb race weight, 10.93@ 124, Twin TVS1900s, Twin Throttle, 429 LSX, 4L80E, custom 14 bolt rear, V2, R̶o̶a̶d̶R̶u̶n̶n̶e̶r̶(dead), COS3......
    Gettin' the Groceries

  10. #10
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    Dropped off the injectors to be tested today.






    100-200 miles and a few passes on these plugs. All on VP110.






    2017 Camaro SS, 2014 Ram 2500 4x4 Cummins 6.7L, 2004 Chevy Avalanche Z71 4̶X̶4̶(now 2WD), 5870lb race weight, 10.93@ 124, Twin TVS1900s, Twin Throttle, 429 LSX, 4L80E, custom 14 bolt rear, V2, R̶o̶a̶d̶R̶u̶n̶n̶e̶r̶(dead), COS3......
    Gettin' the Groceries

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