Close, stock 454 L29 injectors are 18ish @ 3 bar, and 22 @ 4 bar, LS1 injectors (99-00) are 22 @ 3 bar. And LS1/LS6 from 01-up are 28.8 @ 4 bar, 24 @ 3 bar (same as LT1). The PCM should be able to handle the LS1 stock injectors fine, but it will run on the rich side on the LTFT's, so you might need to dial them back, talk to Lyndon, he will tell you for sure. I found a chart that looked good and fancy, but was dead wrong, just try to tune a car with what you think are larger injectors than you have, and tell the PCM you have larger, it will hose a lot up....
GM really like the 18 and 19 lb injectors, the Cadillac 4.5L and 4.9L's got them, the 305 TPI's got them, the L99 4.3L/265's got them and the L29 454's got them. The Cadillac ones had a lot of problems with windings shorting out. The L29 ones leaked and were just plain poor quality, and really just plain too small for a 454 if you do any mods.
The V6's and 5.7 V8's got larger injectors, 22-24 lb/hr, TPI (22) and LT1 (24), the SC 3800's got 36's. I think GN Regals and 89 TTA's got 36's too.
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Originally Posted by dietzster
Yeah I've been doing alot of reading, I found out the LS1 injectors are rated like this
1998 are 28.8 lbs at 4 bar
99-00 are 26.2 lbs at 4 bar
01-02 are back to 28.8 lbs at 4 bar (with different part numbers)
I guess that is why no tune is needed on the 99-00 injectors because at 3 bar they are basically the same as our stock injectors.
I think I will try this and see how it turns out, the injectors I can get are the 28.8 lb ones from a 98 WS6.
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94 Cadillac Fleetwood Brougham w/RPO V4P
00 Buick Park Avenue Ultra SC 3800
99 K2500 Suburban 454, Tuned by Me!
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