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View Full Version : New to forum, not so new to TBI.


ILIKEMYTBI
08-11-2018, 03:23 AM
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.
jim_in_dorris
08-11-2018, 09:46 PM
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.
ILIKEMYTBI
08-12-2018, 04:23 AM
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.
jim_in_dorris
08-12-2018, 07:11 AM
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.
ILIKEMYTBI
08-12-2018, 06:24 PM
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.
stew86MCSS396
08-13-2018, 04:24 AM
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.
ILIKEMYTBI
08-14-2018, 08:01 PM
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
stew86MCSS396
08-15-2018, 05:36 AM
This was a hind sight thought...using Dave W BPW calculator (http://www.gearhead-efi.com/Fuel-Injection/showthread.php?395-1227747-TBI-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.