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Thread: New Member 'need to become a tuner' - LT1 based Rock Buggy

  1. #1
    Carb and Points!
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    New Member 'need to become a tuner' - LT1 based Rock Buggy

    Hey guys. My name is Paul - pretty much anything with wheels that rumbles is cool to me.

    Most recently me and my friends have been working a project to build a go fast rock racer. Nearly the whole buggy is custom built out of my garage. Drivetrain is based on LT1 lifted from a 94 b-body. Previous owner had motor rebuilt and unfortunately (or fortunately) was not able to put it back together enough to run the upgraded motor.

    We lifted out the engine/trans/wire harness and confirmed all was well by running prior to starting the project to build around it. Transmission has been rebuilt and now drivetrain is ready to come back to life for some fun.

    Fast forward a year (one Saturday at a time) or so and we now have our buggy built around the drivetrain, engine runs but needs initial cleanup/tune....how I came to find this site.

    I look forward to enjoying/learning from your projects and hopefully can draw from the experiences of the members.

    Initially I am working to get basics up and running and once settled in tune for our specific needs.

    Look forward to spending some time here...Paul

  2. #2
    Welcome Paul.

    As someone that is around Ultra 4 a lot... I can say tuning for that is very very different than street/strip style application. As much as go fast offroad is in and out of the throttle, you need to have everything very accurate and realize a small series of drag races is not the way to think about it.

    Just did what started as a COPO LS 427 this weekend. Its now a 447 and a bit more pissed. No IAC on this setup. You could call it go fast off road.
    https://www.facebook.com/Team208Moto...4210722099353/
    https://www.facebook.com/Team208Moto...3844065469352/
    https://www.facebook.com/Team208Moto...4341525419606/

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  4. #4
    Fuel Injected! steveo's Avatar
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    lt1, right up our alley!

    for an lt1 with offroad/race config, i'd run it naked to eliminate failure points. baseline it on o2s and knock sensor (if you still have any) without a maf, then yank the knock sensor, o2 sensors, anything like that and hand tune it. none of that crap matters on a race engine.

    i even run my street cars open loop speed density now, the fine tuning ability you have for fueling is awesome....

    definitely do try eehack, run it in 'f-body' mode (even though it's a b-body engine), you can try messing with coarse adjustments to timing advance while you're driving

  5. #5
    I'd run speed density but keep the O2s. Any minor changes in the fuel system will want feed back. I do believe in running it as simple as possible though. Seen too many MAFs fail due to off road conditions.

    LT1 wise, Steveo is the man. I'm just speaking from my experience.

  6. #6
    Carb and Points!
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    Awesome work and awesome ride! That baby's got come kick and sounds even better! I agree - matches my definition of go fast off road! Thanks for the welcome and nice to know there are some others working it. I checked out your site - cool. I appreciate your thoughts and insight very much. Paul

  7. #7
    Carb and Points!
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    Cool - thanks for the welcome & and out of the gate thoughts steveo. With the thoughts from you guys I'm pretty fired up to get connected and going.

    I see that EEhack is your fine work - congratulations - quite a package! I have a copy now and tonight when I get home ill see if I can get it all connected. Gotta get that first step going....

    Paul

  8. #8
    Carb and Points!
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    Thanks Dave for the welcome and reading materials.....ill get going on it.

    Paul

  9. #9
    Fuel Injected! steveo's Avatar
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    Quote Originally Posted by PaulF View Post
    Cool - thanks for the welcome & and out of the gate thoughts steveo. With the thoughts from you guys I'm pretty fired up to get connected and going.

    I see that EEhack is your fine work - congratulations - quite a package! I have a copy now and tonight when I get home ill see if I can get it all connected. Gotta get that first step going....

    Paul
    if it works well, and you use my eex xdf file, you'll pretty much have everything you need to get 'er going.

  10. #10
    Carb and Points!
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    Quote Originally Posted by steveo View Post
    if it works well, and you use my eex xdf file, you'll pretty much have everything you need to get 'er going.

    Ill go grab those in prep for when it works well :)

    Last night tho I ran into an issue. To ensure it was not computer/setup I tested on 2 Windows 10s & 1 XP computers, brand new cable, new FTDI VCP drivers with adjusted latency at 1ms yielded error (below) - feels like its on the buggy side from the wiring harness work but in case you have seen before thought id post.

    It definitely connected as initial information from the ECM is displaying on the dashboard which is pretty cool.

    SERIAL: READ =010031000051000000000000000000804000FFFF00FF024F0 4662801F4240075F43A6366650080808080000000000000009 52000000000008000000039WRITE=F46204000000000000000 000000000A6
    SERIAL: READ =F46204000000000000000000000000A6
    SERIAL: WAITED_TOO_LONG in serial_read_packet
    WRITE=F4570100B4
    SERIAL: READ =F4570100B4
    SERIAL: READ =F491



    Ill keep working it.
    Paul

  11. #11
    Carb and Points!
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    Hey guys - good update.

    Finally tracked down and resolved the issue - it was a bad ecm.

    With a good ECM full connectivity has been acheived and first flash to put baseline bin without MAF and vats complete.

    Now working the recommended path - get a good baseline - currently working a knock sensor issue.

    Once I get past this phase I am really looking forward to get it running better as recommended above in the thread.


    Thanks again for the help - talk soon.
    Paul

  12. #12
    Carb and Points!
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    Hey guys.

    Working the basics just now learning how things fit together.

    Are there some good tune $eehack log files available on the site (I searched but didn't turn up) or would someone offer one that has some idle, throttle blips, mid throttle and WOT? I am looking to confirm my understandings on how things should look when in a good state of tune rather than bothering you guys with basic tuning 101 questions.

    Appreciate any help. Paul

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