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Thread: A little help with fuel/spark cut after trans swap

  1. #1
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    A little help with fuel/spark cut after trans swap

    I have a 2004 Colorado 3.5L with a turbo on it. It was originally a 4L60E truck, and I just swapped an AR5 manual in it. Everything seems fine, except now the truck wont rev past 5k rpms. My tuner was really flaky before, so I bought HP so I can tweak the tunes myself. I have a little tuning knowledge, but at the same point, I'm a newbie to this. Just looking for a little help/guidance to point me in the right direction. Any help would be greatly appreciated! I have a data log and I will attach the tune file if anyone can take a look at them for me.5k.hplColoradov1.0.hpt

  2. #2
    Senior Tuner BackyardTurbo_FTW's Avatar
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    I have no experience with this vehicle, but I would set this table to match your 6200 cutoff and see if it helps. Seems like this should fix it!

    rev.png

  3. #3
    Senior Tuner BackyardTurbo_FTW's Avatar
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    I would also add a little fuel to PE, its set for 11.8, I would shoot for 11.3 area personally. Also, the timing seems pretty low!

  4. #4
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    Since you're running a manual, no PRDL input or anything, it's not sure what gear its in. So ass BYT mentioned, you've got to set all the limiters for park/neutral up to match gear.
    JTC Performance - Authorized HP Tuners Reseller
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  5. #5
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    Quote Originally Posted by BackyardTurbo_FTW View Post
    I have no experience with this vehicle, but I would set this table to match your 6200 cutoff and see if it helps. Seems like this should fix it!

    rev.png
    I feel like an idiot, I was in basic view so I didnt even see this adjustment, otherwise that would make sense. Anyway, thanks a ton for the help! I'm still tweaking the tune obviously, I recently switched to E85 so im still working on the timing trying to find the sweet spot.

  6. #6
    Senior Tuner BackyardTurbo_FTW's Avatar
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    Well, on E85 that Air Fuel should be good as long as you aren't running some insane amount of boost. But I would say the timing is a solid 10* off (again, considering a reasonable boost level)

  7. #7
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    yeah I am only on 10psi of boost. So far it made 350hp and 350tq to the wheels. I want to try and squeeze 400 out of it. Ill try kicking the timing up a little and see what happens