Stock injector rating?
- Thread starter myclone
- Start date
TheObiJuan
Active member
these are some big injectors, ls1 have 26-28#'s. and those are fine for plenty of power, howcome we need to upgrade to 50#'s to get some decent numbers?
Easy math, you can calculate how much fuel you need to support a given amount of horsepower.
Syty - 6 x 28 = ~168lb/hr, at .5 BSFC, that's good for 340hp (give or take), on a truck that made 280 hp. 280/340 = 0.82
LS1 - 8 x 26 = 208lb/hr, at .5 BSFC, that's good for ~420hp, on a car that made 345hp. 345/420 = 0.82
Interesting eh?
Now don't bring up the cars/trucks that make more than the horsepower estimates I have just posted. Those vehicles either run more fuel pressure, or run leaner BSFC's, or both. These are just estimates.
I went to 50s for several reasons, I've gone over it about 100 times now.
Here are my biggest choices for upgraded injectors:
36lb/38lb/42.5lb/50lb
The 36lb blue top injectors had great characteristics, were great injectors, and used to plentiful. They aren't anymore. 36lb Delphi's are a bit more difficult to tune for, plus they only offer a *tad* more fuel.
38s, still difficult to tune for, and don't offer us *that* much more headroom.
42.5lb 009 injectors are very difficult to tune for. I did make some progress with them, but once you start throwing modified motors into the mix, the part throttle/idle calibration needs to be changed so much, so I'd really struggle with each chip version.
50s - very easy to tune for, offer a lot of injector headroom, easy to modify each calibration for different versions (heads/cam versus stock motor buildups). Also, if a person does 50s on the stock motor with bigger turbo build, when/if they go to a built motor with heads & cam, it would only require an eprom upgrade to a different program. The Buick guys are heading this way also, many very stock guys are going straight to 50s, then changing the chip cal once they modify the car.
Syty - 6 x 28 = ~168lb/hr, at .5 BSFC, that's good for 340hp (give or take), on a truck that made 280 hp. 280/340 = 0.82
LS1 - 8 x 26 = 208lb/hr, at .5 BSFC, that's good for ~420hp, on a car that made 345hp. 345/420 = 0.82
Interesting eh?
Now don't bring up the cars/trucks that make more than the horsepower estimates I have just posted. Those vehicles either run more fuel pressure, or run leaner BSFC's, or both. These are just estimates.
I went to 50s for several reasons, I've gone over it about 100 times now.
Here are my biggest choices for upgraded injectors:
36lb/38lb/42.5lb/50lb
The 36lb blue top injectors had great characteristics, were great injectors, and used to plentiful. They aren't anymore. 36lb Delphi's are a bit more difficult to tune for, plus they only offer a *tad* more fuel.
38s, still difficult to tune for, and don't offer us *that* much more headroom.
42.5lb 009 injectors are very difficult to tune for. I did make some progress with them, but once you start throwing modified motors into the mix, the part throttle/idle calibration needs to be changed so much, so I'd really struggle with each chip version.
50s - very easy to tune for, offer a lot of injector headroom, easy to modify each calibration for different versions (heads/cam versus stock motor buildups). Also, if a person does 50s on the stock motor with bigger turbo build, when/if they go to a built motor with heads & cam, it would only require an eprom upgrade to a different program. The Buick guys are heading this way also, many very stock guys are going straight to 50s, then changing the chip cal once they modify the car.
TheObiJuan
Active member
just letting you know that i was not flaming the 50's. i love the 50's. they are good injectors that i feel open the way to a lot of power, and combined with more air (i.e bigger turbo), cant nobody stop us now. lol. i would not want anything else, imagine using the stock ones and then i get a few mods and then i need some new ones, say i go to 38's because i think 50's are too big. then later i do some major mods like heads, mild cam,and pte52 kit, . then i need to go 50's. waste of money to go from 38's to 50's. forget all that and do the ultimate with 50's is what i say. FWIW
-Juan
-Juan