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tripleblack · 06-21-2005, 05:52 AM

I got this data from Summit:

Injector lbs./hr. = horsepower x BFSC/number of cylinders (.55 for sc). If we think positive, you should be running 500hp+ at the flywheel soon...

Injector lbs./hr. = 500 x .55/8
Injector lbs./hr. = 500 x .06875
Injector lbs./hr. = 34.375#

Since this is an optimisitic method for calculating injector size, and a modest estimate of your motor's power potential, I believe you will probably need 42# injectors, particularly with the nitrous.

As for the problem with your lean condition, perhaps the knock sensor was cutting in and saving the situation before it went critical? (Not an opinion here - just a speculation.)

Luck with your car - wish I had your problems, by the way...

tripleblack

[quote=Lightning247]I just got the car back from having the Cobra dyno tuned on the nitrous...and aside from the Venom Nitrous kit not working properly, Jerry @ SCT says i've run out of injector (Cobra's have stock 24 lbers) at 333rwhp and 389 rwtq. I was a little pissed that this was all she put down on the spray, and this was with 1000 psi bottle pressure. I think i'm only seeing about a 50 shot though, and jumping to 42lbers and a LMAF or SCT Big Air meter will solve my problems."

06-21-2005, 05:52 AM	#13 (permalink)
tripleblack Senior Member Join Date: May 2005 Posts: 337	Math I got this data from Summit: Injector lbs./hr. = horsepower x BFSC/number of cylinders (.55 for sc). If we think positive, you should be running 500hp+ at the flywheel soon... Injector lbs./hr. = 500 x .55/8 Injector lbs./hr. = 500 x .06875 Injector lbs./hr. = 34.375# Since this is an optimisitic method for calculating injector size, and a modest estimate of your motor's power potential, I believe you will probably need 42# injectors, particularly with the nitrous. As for the problem with your lean condition, perhaps the knock sensor was cutting in and saving the situation before it went critical? (Not an opinion here - just a speculation.) Luck with your car - wish I had your problems, by the way... tripleblack [quote=Lightning247]I just got the car back from having the Cobra dyno tuned on the nitrous...and aside from the Venom Nitrous kit not working properly, Jerry @ SCT says i've run out of injector (Cobra's have stock 24 lbers) at 333rwhp and 389 rwtq. I was a little pissed that this was all she put down on the spray, and this was with 1000 psi bottle pressure. I think i'm only seeing about a 50 shot though, and jumping to 42lbers and a LMAF or SCT Big Air meter will solve my problems."