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Type: Posts; User: thehemi

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    Data collection for LTFTs

    It's often suggested to drive 50, 100 or whatever miles for the PCM to learn the LTFTs after a re-tune.

    Is it necessary for this to be a single session or, for instance, would (5) 20 mile drives =...
  2. Fair enough! I'm attaching my current tune and...

    Fair enough! I'm attaching my current tune and yesterday's data log.

    Thanks,
    Scott
  3. After adjusting the throttle cable, idle is...

    After adjusting the throttle cable, idle is 785-815 (commanded 800) and IAC is 36. I think that's perfect.

    I went on a test drive to check on the RPM surge and the car is actually driving great. ...
  4. Thanks for the advice/suggestions, everyone. I...

    Thanks for the advice/suggestions, everyone.

    I do appear to be throttle cable limited instead of the throttle stop. This is a 2001 Camaro SS. Let me work on addressing that first and see if I...
  5. No, I'm trying to figure out what I need to...

    No, I'm trying to figure out what I need to adjust for the larger TB.

    I just find it odd it runs fine with the A/C on, but not with A/C off.

    Thanks,
    Scott
  6. RPM Surge (except with A/C) with FAST 102 + 102mm TB

    Background: Mostly stock LS1 with FAST LSXR 102, 102mm TB and 100mm MAF

    I'm currently doing all this testing in SD mode with MAF disabled. In case it matters.

    In gear while cruising, it'll...
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    For what it's worth, I think I may have...

    For what it's worth, I think I may have discovered what is the problem.

    Someone reviewing one of my logs noticed the MAP was reading 75 kPa all the time. Even when it wasn't running.

    I pulled...
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    OK, I attempted a few more things. - I...

    OK, I attempted a few more things.

    - I disabled the MAF
    - It throws P0103 and runs super rich
    - I reenabled the MAF
    - I disabled Closed Loop (I believe)
    - It idles reasonable for ~10...
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    No, just the intake manifold, TB and MAF. ...

    No, just the intake manifold, TB and MAF.

    Thanks,
    Scott
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    I assume I can just unplug the MAF to run in MAF...

    I assume I can just unplug the MAF to run in MAF failed mode?

    Thanks,
    Scott
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    I changed more than just the MAF -- FAST LSXR 102...

    I changed more than just the MAF -- FAST LSXR 102 intake, 102 TB and 100 MAF.

    Thanks,
    Scott
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    I'm attaching my pre LSXR tune (baseline), post...

    I'm attaching my pre LSXR tune (baseline), post LSXR tune (MAFx1.33) and recent cold start data log.

    I can get a longer data capture if I can find out why it's running so rich. It's pegging my...
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    Are we talking about the tune or a data log? I...

    Are we talking about the tune or a data log?

    I will get a data log collected today and post both.

    Thanks,
    Scott
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    Tune for LS1 with FAST 102 and 100 MAF

    I just installed a FAST 102 and 100 MAF on my nearly stock LS1 (only other mod is LTs).

    Even updating the MAF table, it's too unstable to be able to drive to a shop for a tune. Something in the...
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    Equinox "Service Stabilitrak"

    My 2015 Equinox has the "Service Stabilitrak" warning nowadays. There's no DTCs per my HPT Scanner.

    Should my HPTuners be able to tell me what's wrong with the Stabilitrak? Or do I need...
  16. Stumble when Stabbing the Throttle (4.3 w/ bigger injectors)

    Setup: Stock '99 4.3 with Marine MPFI intake and MotoTron 60# injectors
    Issue: Stumble when stabbing the throttle. If too quick, it can backfire. Same in Park or loaded.

    I'm running stock exhaust...
  17. It sounds like California needs some automotive...

    It sounds like California needs some automotive "Right to Repair" legislation! I can certainly understand requiring vehicles to pass an emissions sniff test. I imagine no one can realistically argue...
  18. California Will Start Testing for ECU Tunes During Smog Checks

    California Will Start Testing for ECU Tunes During Smog Checks Starting Next Week
    https://www.roadandtrack.com/news/a37022836/california-ecu-tune-during-smog-checks/



    How would the smog checks...
  19. Bingo! I was not aware there was an Advanced...

    Bingo! I was not aware there was an Advanced view. I'm good to go now.

    Thanks!
    Scott
  20. Disabling SD for MAF tuning on 2001 Camaro SS

    I unplugged my MAF so I could do the SD (VE) tuning. How do I disable SD so I can do the MAF tuning?

    It seems every video/article covering this has tables which my tune does not have (e.g....
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    Tuning an LS1 with Long Tube Headers

    I'm thinking about putting Long Tube Headers on my LS1 Camaro. The only drivetrain upgrade other than SLP Lid.

    It's my understanding I will need a tune adjustment after installing the LTs. Is it...
  22. 2020 Chevrolet Corvette to get an 'un-tunable' ECU?

    https://www.autoblog.com/2019/06/01/2020-chevy-corvette-c8-tuner-proof-ecu/



    Interesting. Where there's a will...
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    I installed the marine MPFI intake manifold and...

    I installed the marine MPFI intake manifold and MotoTron 60# fuel injectors.

    Does the 0411 PCM upgrade allow for a 2 bar MAP sensor? I could use that. (And perhaps 3 bar next...)
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    No, it's not a vacuum leak, it's the tune. ...

    No, it's not a vacuum leak, it's the tune. Sounds like an emissions thing. I think it's most annoying with manual transmissions.
    ...
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    I will work on pulling it down. It's the factory...

    I will work on pulling it down. It's the factory tune, though.

    Thanks,
    Scott
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