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Thread: Throttle Cracker Tuning Question {B4309}

  1. #91
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    Yep I wouldn't expect this thing to drive exactly like a factory car. The improvements made so far are very impressive!

    I got a log. Again it's driving quite well. There was a bit of inconsistent surging/bucking around frames 4,926-5,070. Other that that the drive was good.

    I blipped the throttle at the end of the log as follows:
    Blip 1, no headlights: Frames 13,717-13,752
    Blip 2, no headlights: Frames 13,754-13,790
    Blip 3, headlights: Frames 13,851-13,885
    Blip 4, headlights: Frames 13,892-13,936
    Blip 5, headlights: Frames 13,948-13,990

    I've attached the log below. Let me know what your thoughts are or the next step. The help has been amazing, thank you!

    Log:
    GTO April 17 2019 IBC to home.efi

  2. #92
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    My thoughts are that we can still make your tune a bit better... so the next step is for you to do another log.

    Do some really small throttle blips this time... that's where things are not quite right.
    Last edited by statesman; May 2nd, 2019 at 12:27 AM.

  3. #93
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    Got it! Things are still improving. There are a few spots where there is some slight bucking, but there weren't any spots that were very high amplitude. Any bucking was fairly subtle, so definitely getting better.

    I did a bunch of throttle blips at the end of the log as follows:

    No headlights, blips during frames 13,467-13,673
    Headlights, blips during frames 13,703-13,988

    There wasn't anything that really stuck out to me. Let me know what you think, if there is anything specifically that you need me to do let me know.

    Thank you!

    Log:
    GTO April 22 2019 IBC to home.efi

  4. #94
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    I'm almost happy with that log. This time for part of the log try to back off the throttle earlier and slower than you normally would, so you get some really mild decelerations... and for the rest of the time drive like you normally do.
    Last edited by statesman; May 2nd, 2019 at 12:28 AM.

  5. #95
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    Sweet, almost there! I got the log, overall the car seems to continue to improve. There were a couple areas of bucking, nothing crazy though. I got lucky and didn't run into much traffic, so I was able to do the mild deceleration you described. Hopefully the data I got is good, if not let me know what I can improve on and I can get another log.

    A few spots where I got the mild deceleration captured are as follows:
    Frames 2,321-3,307
    Frames 3,645-4,022
    Frames 5,633-6,014
    Frames 7,518-8,156

    I did some throttle blips at the end as well as follows:
    Headlights off, frames 13,417-13,611
    Headlights on, frames 13,616-13,808

    For about half the drive, I think starting around frame 8,500, I had my headlights on. It was a bit rainy and got pretty dark during the drive. The last tweaks seemed to make a big difference with the idle staying more stable with the headlights on.

    I've attached the log below. If you need me to try anything else let me know. Thanks again for the massive help!

    Log:
    GTO April 25 2019 IBC to home.efi

  6. #96
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    Quote Originally Posted by pinstripebob View Post
    There were a couple areas of bucking, nothing crazy though.
    I can see where it's happening. There's only a little bit of bucking in places now, but we'll still try to get rid of the last of it.

    Quote Originally Posted by pinstripebob View Post
    Thanks again for the massive help!
    I can tell that you're genuinely grateful... you thank me every time you post.


    This time I'd like you to do a throttle position sensor reset and then do a log the same like you did last time.
    Last edited by statesman; May 2nd, 2019 at 12:45 AM.

  7. #97
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    I did a TPS reset and got a log. There was a little more traffic on my drive, but I managed to get some more mild decelerations like last time in case that helps. A good one is frames 3,100-3,528.

    The only bad instance of bucking was during that portion of the log and frames 4,923-4,986. Other than that it's still improving.

    I did some throttle blips at the end as well, information as follows:
    Headlights off, frames 15,004-15,150
    Headlights on, frames 15,198-15,390

    It does seem to have a more stable idle overall. And yes I am genuinely grateful for your help!

    Let me know if there's anything else I can check or log. I've attached this log below.

    Log:
    GTO May 1 2019 IBC to home.efi

  8. #98
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    I tried tweaking your transients in the last update and I'm not really happy with the results... so I'm putting them back to what they were.

    Most things are where they should be now. I've only got one card left up my sleeve... if this update doesn't fix the bucking, then you're probably going to have to just live with an occasional bit of bucking.

    Log the same as you've been logging.
    Last edited by statesman; May 2nd, 2019 at 12:46 AM.

  9. #99
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    I got another log with this latest tune. Regarding driveability, it has absolutely improved. If I'm holding steady around 40-45kmh with light throttle it will still buck a bit. That sort of behavior is what made me beat up my throttle cracker table in the first place and then start this thread. Frames 4,496-5,205 show some of this bucking, it is mostly very light with a few seconds of the gnarly stuff. That speed has been pretty consistent for bucking, but with this last tune it's definitely better.

    I did some more of the low throttle mild deceleration around frames 2,212-2,664. I also did the end-of-log throttle blips as follows:
    Headlights off: Frames 13,051-13,183
    Headlights on: Frames 13,243-13,419

    I wouldn't expect to have stock-like driveability. Your help has been great, and I'm still very appreciative of it! Let me know what your thoughts are. If need me to do anything or try anything, just say the word! I think we're near the end of our road though which is awesome!

    Log: GTO May 9 2019 IBC to home.efi

  10. #100
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    pinstripebob, remind me which intake manifold you have...

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