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Thread: New to forum, not so new to TBI.

  1. #1
    Carb and Points!
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    New to forum, not so new to TBI.

    Hi all,

    This is my first post here on the forum. Looking to learn more about TBI since I just did a rebuild on my fathers old 1992 C1500 and swapped a 5.7 in it since it had a 4.3 with 323K miles! (wow!) Anyway, wanting to learn more about tunes, maybe get a couple done and then try for myself. Thank you all for the great info on here.

  2. #2
    Fuel Injected! jim_in_dorris's Avatar
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    When you put the 350 in, did you also change the ecm or the prom? A 4.3 prom won't work very well. If using the original ecm, it is probably an 8625. If that is the case, get a 350 memcal and it will at least be drivable. If you swapped put the ecm when you did the engine upgrade, you should be able to get it driving. Get a obd1 cable and tunerpro rt and start data logging.
    Square body stepsides forever!!!

  3. #3
    Carb and Points!
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    Quote Originally Posted by jim_in_dorris View Post
    When you put the 350 in, did you also change the ecm or the prom? A 4.3 prom won't work very well. If using the original ecm, it is probably an 8625. If that is the case, get a 350 memcal and it will at least be drivable. If you swapped put the ecm when you did the engine upgrade, you should be able to get it driving. Get a obd1 cable and tunerpro rt and start data logging.
    Hi and thanks for the reply. I installed a 6299 ECU and AWLB prom along with it. Instead of sourcing a correct AWLH prom for the 5.7 and 5-speed, I had one burned by someone else. I am less than happy with how things have gone. I am currently seeking a stock AWLH chip for it. I don't think I need to data-log it yet, as it is a stock swap. I really just need a stock chip to get me by for now. But eventually I would like to data log and maybe even make my own.

  4. #4
    Fuel Injected! jim_in_dorris's Avatar
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    Quote Originally Posted by ILIKEMYTBI View Post
    Hi and thanks for the reply. I installed a 6299 ECU and AWLB prom along with it. Instead of sourcing a correct AWLH prom for the 5.7 and 5-speed, I had one burned by someone else. I am less than happy with how things have gone. I am currently seeking a stock AWLH chip for it. I don't think I need to data-log it yet, as it is a stock swap. I really just need a stock chip to get me by for now. But eventually I would like to data log and maybe even make my own.
    Ok, that ecm doesn't have a lot of support, if you cannot find the stock prom you are looking for, the 7747 ecm is plug and play, it has a lot of work done to it, and the ASDX bin is for a 5.7 manual truck. Good luck with your hunt.
    Square body stepsides forever!!!

  5. #5
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    Quote Originally Posted by jim_in_dorris View Post
    Ok, that ecm doesn't have a lot of support, if you cannot find the stock prom you are looking for, the 7747 ecm is plug and play, it has a lot of work done to it, and the ASDX bin is for a 5.7 manual truck. Good luck with your hunt.
    Thanks, I didn't realize that the 6299 lacked support before I purchased it. I can see that now. I will definitely be switching to the 7747 here.

  6. #6
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    Quote Originally Posted by ILIKEMYTBI View Post
    Hi and thanks for the reply. I installed a 6299 ECU and AWLB prom along with it. Instead of sourcing a correct AWLH prom for the 5.7 and 5-speed, I had one burned by someone else. I am less than happy with how things have gone. I am currently seeking a stock AWLH chip for it. I don't think I need to data-log it yet, as it is a stock swap. I really just need a stock chip to get me by for now. But eventually I would like to data log and maybe even make my own.
    Wouldn't count the 6299 out if you're running a bone stock setup. Perhaps someone who's done this could chime in with their experience. AWHD is 5.0 and 5 speed, possibly could have the BPW changed to what a 5.7 calls for and run with that.

  7. #7
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    Quote Originally Posted by stew86MCSS396 View Post
    Wouldn't count the 6299 out if you're running a bone stock setup. Perhaps someone who's done this could chime in with their experience. AWHD is 5.0 and 5 speed, possibly could have the BPW changed to what a 5.7 calls for and run with that.
    That's a good idea. I sent my AWLB chip to Dave W. and he is going to put something together for me for my application. I will keep your thought in mind when I begin to dabble with my own chips

    Thanks,
    Jacob

  8. #8
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    This was a hind sight thought...using Dave W BPW calculator, BPW was approximate 1.25 difference between 5.0 vs 5.7. Haven't tried load/compare other parameters in TPRT 5.0 vs. 5.7 to see how different the two would be.

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