looking for LS1 26lb injector information
Posted: Sat Feb 04, 2023 1:17 am
I'm working on converting my 5.7 Vortec truck (1996, with the spider injector assy) to a set of 26lb LS1 injectors, using a Holley 300-263 intake manifold.
Why those injectors? I got them for cheap, and they've got (I assumed) reasonably comprehensive data available, and theyre larger than the stockers.
Why the conversion? I did the lower intake gaskets on my truck and immediately had another coolant leak, after having it all apart and together again to change out an injector on the spider because it was locking open when left to heat soak with the engine off (I tested that injector with a heat gun out of the truck, I know that that was what was happening. If the engine was left to run it was fine, as soon as I killed it, fuel stops flowing, and air stops cooling the injector, and it locked open when turned back on). That was after having it open before that, to change the poppet injectors to MPFI. Long story short, I am so tired of taking the top half of my engine apart to deal with injectors, and dealing with the rotten cheese grade aluminum lower intake that is unavailable new, that I'm just replacing it with something that works and isn't a pain in the ass to service.
Anyway, before I knew there were 2 different sizes of LS1 injectors, I just bought these because they were one of the sizes supported by this manifold, and theyre definitely larger than the spider injectors. I now am having trouble finding injector maps for these. The best I've found is this bin: https://github.com/Snoman002/Engine-Tun ... G6X5111143 which should be for a 1999 vette, which should have the requisite smaller injectors in the calibration. It does not appear to, or I am missing something that allows it to compensate.
Does anyone have the injector tables for these, or know why the bin I refer to appears not to?
Why those injectors? I got them for cheap, and they've got (I assumed) reasonably comprehensive data available, and theyre larger than the stockers.
Why the conversion? I did the lower intake gaskets on my truck and immediately had another coolant leak, after having it all apart and together again to change out an injector on the spider because it was locking open when left to heat soak with the engine off (I tested that injector with a heat gun out of the truck, I know that that was what was happening. If the engine was left to run it was fine, as soon as I killed it, fuel stops flowing, and air stops cooling the injector, and it locked open when turned back on). That was after having it open before that, to change the poppet injectors to MPFI. Long story short, I am so tired of taking the top half of my engine apart to deal with injectors, and dealing with the rotten cheese grade aluminum lower intake that is unavailable new, that I'm just replacing it with something that works and isn't a pain in the ass to service.
Anyway, before I knew there were 2 different sizes of LS1 injectors, I just bought these because they were one of the sizes supported by this manifold, and theyre definitely larger than the spider injectors. I now am having trouble finding injector maps for these. The best I've found is this bin: https://github.com/Snoman002/Engine-Tun ... G6X5111143 which should be for a 1999 vette, which should have the requisite smaller injectors in the calibration. It does not appear to, or I am missing something that allows it to compensate.
Does anyone have the injector tables for these, or know why the bin I refer to appears not to?