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anybody good at injector bullshit?

Old 08-28-2007, 12:34 PM
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Default anybody good at injector bullshit?

i used to be good at math in school, but my lack of practice makes me come here for my answer. i have a z6 revving to roughly 7500rpm shooting for 400hp with about 25psi. what injectors do i need? 800cc be good?
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Old 08-28-2007, 01:18 PM
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Default Re: anybody good at injector bullshit?

you'll be fine with 800's... Idk if I've ever seen an 800cc squirt before though. Look at JFK78. 750's got him 440hp at 28 pounds on a mustang dyno with a y8.
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Old 08-28-2007, 02:33 PM
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Default Re: anybody good at injector bullshit?

Yeah I think 750cc's are plenty. Precision makes high imp 660cc's that are supposed to be good to like 440 at the crank and their only $260 shipped from LSD and they'll be easier to to work with at idle.
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Old 08-28-2007, 03:22 PM
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Default Re: anybody good at injector bullshit?

in my head 800's seem like overkill. it was just a number i threw out there
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Old 08-28-2007, 11:03 PM
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Old 08-29-2007, 06:53 AM
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Default Re: anybody good at injector bullshit?

i tried that a fwe days ago and came up with 800cc. that seemed a bit overkill to me, but i guess its better to have too much than not enough. idle smoothness isnt a huge concern as long as it will idle
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Old 08-29-2007, 10:37 PM
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Default Re: anybody good at injector bullshit?

It all depends really on how high a duty cycle you want to run...
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Old 08-30-2007, 06:40 AM
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Default Re: anybody good at injector bullshit?

from what i have read injectors shouldnt be run above 80% duty cycle so thats what i set it on the calculator. i dont mind running 800cc injectors, i will deal with a not so nice idle. i just dont want to be pushing the injectors to the limit all the time or not have enough for the power level.
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Old 08-31-2007, 11:51 AM
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Default Re: anybody good at injector bullshit?

I came up with 720cc's for 400hp @ 80% duty cycle and 0.55 BSFC, and 680cc @ 85% duty cycle. I usually go with 0.55 for BSFC on forced induction setups, RC's site lists to use 0.60 though which seems a bit higher than normal (most n/a honda's run at 0.45 bsfc) but would land you around the 800cc mark.
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Old 08-31-2007, 01:33 PM
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Default Re: anybody good at injector bullshit?

i did 60 cause thats what they reccomend. i think i will just get 800cc injectors then i dont have to worry about it
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