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Old 12-26-2007, 02:49 AM   #1
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Default 460cc or 550 cc injectors?

For running about 12 psi on a megasquirt, any reason I should get 550 cc injectors instead of 460cc? I will have a stock fuel pump..

According to Brains calculations, I only need 400cc.. so 460cc's should be plenty.. correct?
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Old 12-26-2007, 03:26 AM   #2
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yeap...that should be enough...460 is good...
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Old 12-26-2007, 03:27 AM   #3
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Get the 460s, they'll idle better and be good to around 250 HP at stock fuel pressure.
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Old 12-26-2007, 09:43 AM   #4
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my duty cylces are getting a lil too high for my 460's. I gotta figure out why that thing is making 18 lbs of boost. :-/
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Old 12-26-2007, 10:10 AM   #5
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are you running rx7 460s? I'm running rceng 440s, and at 17.5 psi I still have some headroom. I think there's a lot to be said about nozzle type injectors vs pintle type.
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Old 12-26-2007, 06:53 PM   #6
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yup, the rx7 460's. since i had never had the car up to that boost level it wasn't tuned for it so it was running a lil rich which is raising the DC a lil. 11.8 AFR. I do not plan to run that much boost so once i figure out that problem the 460's should be plenty.
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