454tb on 383stroker
04-09-2001, 08:22 PM
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454tb on 383stroker
I would first like to thank everybody for being so supportive of a truck guy using your 3rd gen f body site. I have had several posts and You have helped me understand the workings of my truck considerably and looking forward to the future programming of my project. the wife and kids think I lost it but they have no idea how much fun this project has been so far.
I purchased all the eprom programming equipment and datamaster scan tool for the future installation of a 383 stroker for my 1991 4x4. I was going to use the stock tb from the oem 350sb (55lb injectors)but have now purchased a 454 throttle body complete (80lb injectors I think). The engine will be strictly used for towing and will probably reach wot on heavy towing applications. I purchased the 454tb unit because I was afraid of leaning out the stroker engine and figured it would be best to start this engine rich and try to tune the fuel table to reach 128 using the 454tb. Can I not compensate by dropping pressure on the regulator and changing the fuel tables get me to the proper afr or is this just to much injector for my application. I figured that I would have to purchase a new fuel pump for the 350tb anyways and if I got a 454tb I could save this money and also not have to purchase 68lb injectors for the 350tb.. what should I do on the fuel table reduce everything by a percentage? Also, will the 454tb sensors fit to the 350tb wire harness.
383 stroker, 64cc 23deg trickflow heads c/w edlebrock performer intake and adapter, cam is an extreme 4x4 comp. Cam. 12-235-2 grind ( .447/.462 lift, duration 210 218 lift @50, 111 lobe separation) . unit has hypr. Flattop floating pistons, eagle cast crank, 5.7eagle rods. 10.2:1 comp. Headers c/w 2.5” flowmaster exhaust. 1227747 ecm, asdu.bin.
I purchased all the eprom programming equipment and datamaster scan tool for the future installation of a 383 stroker for my 1991 4x4. I was going to use the stock tb from the oem 350sb (55lb injectors)but have now purchased a 454 throttle body complete (80lb injectors I think). The engine will be strictly used for towing and will probably reach wot on heavy towing applications. I purchased the 454tb unit because I was afraid of leaning out the stroker engine and figured it would be best to start this engine rich and try to tune the fuel table to reach 128 using the 454tb. Can I not compensate by dropping pressure on the regulator and changing the fuel tables get me to the proper afr or is this just to much injector for my application. I figured that I would have to purchase a new fuel pump for the 350tb anyways and if I got a 454tb I could save this money and also not have to purchase 68lb injectors for the 350tb.. what should I do on the fuel table reduce everything by a percentage? Also, will the 454tb sensors fit to the 350tb wire harness.
383 stroker, 64cc 23deg trickflow heads c/w edlebrock performer intake and adapter, cam is an extreme 4x4 comp. Cam. 12-235-2 grind ( .447/.462 lift, duration 210 218 lift @50, 111 lobe separation) . unit has hypr. Flattop floating pistons, eagle cast crank, 5.7eagle rods. 10.2:1 comp. Headers c/w 2.5” flowmaster exhaust. 1227747 ecm, asdu.bin.
04-09-2001, 11:42 PM
#2
IMHO the 80# injectors are fine for your 383. You probably won't have to drop the fuel pressure, maybe even raise it depending on how much fuel the engine wants.
The BPW value tells the 7747 ECM how large the injectors are. Decreasing the BPW leans all the fuel functions. You will have to juggle the BPW, FP, and fuel table to get the proper AFR's. You want enough FP and high enough BPW to maintain an aceptable AFR at WOT. Just take your time and do plenty of testing before taking the engine to WOT to make sure you don't go lean.
The BPW value tells the 7747 ECM how large the injectors are. Decreasing the BPW leans all the fuel functions. You will have to juggle the BPW, FP, and fuel table to get the proper AFR's. You want enough FP and high enough BPW to maintain an aceptable AFR at WOT. Just take your time and do plenty of testing before taking the engine to WOT to make sure you don't go lean.
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