are 30lb injectors enough for 100 dry shot?
10-03-2005, 02:15 PM
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are 30lb injectors enough for 100 dry shot? i have a 402 w/ a tiny cam making about 520 flywheel horsepower with 30lb injectors. is it safe to put a 100 dry shot on top of that?
10-03-2005, 04:44 PM
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I would personally go with some 42 Lbers.
Matt
EDIT: LSX fuel pressure is 58.0 PSI, so a 42 Lb fuel injector will act as a 48.83 lb/hr fuel injector on a LS1.
Matt
EDIT: LSX fuel pressure is 58.0 PSI, so a 42 Lb fuel injector will act as a 48.83 lb/hr fuel injector on a LS1.
Last edited by Matt@HSW; 10-03-2005 at 05:00 PM.
10-03-2005, 05:09 PM
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Originally Posted by Robert56
Here's the math,
(Projected hp X .6) / 6.4 = min injector size to meet 80% duty cycle
So,
620hp - 15% drivetrain lose = 527rwhp
527rwhp x .6 = 316 / 6.4 = 49lb injectors
Hope this helps
Robert
(Projected hp X .6) / 6.4 = min injector size to meet 80% duty cycle
So,
620hp - 15% drivetrain lose = 527rwhp
527rwhp x .6 = 316 / 6.4 = 49lb injectors
Hope this helps
Robert
Glad you posted that, usefull info.
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10-04-2005, 08:51 AM
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Originally Posted by Robert56
15% drivetrain lose = 527rwhp
i only have 371 at the wheels.
10-04-2005, 08:53 AM
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another thing is that the 30lb injectors actually flow around 36lbs at 4 bar. maybe i'll get new injectors anyways...........i don't have a lot of money and the 30lbs are barley used........
10-04-2005, 10:45 AM
#14
Well where did you get 520 crank horse and 25% drivetrain lose? 15% is just a standard base number used, vettes are usually closer to 17% because of independent rear end. Anyway.
371 + 100 = 471rwhp
471 x .6 / 6.4 = 44lb injector at 80%
471 x .6 / 8.0 = 35.32lb injector at 100%
So, you can see that your current injectors are going to be static at your hp level you want. Static is not good. You can go past the rec 80% for short runs, but static I would say stay away from.
Robert
371 + 100 = 471rwhp
471 x .6 / 6.4 = 44lb injector at 80%
471 x .6 / 8.0 = 35.32lb injector at 100%
So, you can see that your current injectors are going to be static at your hp level you want. Static is not good. You can go past the rec 80% for short runs, but static I would say stay away from.
Robert
10-04-2005, 01:01 PM
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15% is for manual tranny's... when i had a six speed the car dyno'd around 440 at the wheels with an aluminum driveshaft. 440 is approx 15% power loss from 520. then i swapped to a t400 trans, steel driveshaft and an unlocked converte and dyno'd at 371 without any changes to the motor or tuning. the motor didn't loose power....... it just got used up by the heavy drivetrain and converter. your 15% standard base is off of factory vehicles. not drag cars. lol
10-04-2005, 01:05 PM
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Originally Posted by Robert56
So, you can see that your current injectors are going to be static at your hp level you want. Static is not good. You can go past the rec 80% for short runs, but static I would say stay away from.
Robert
Robert
