what do you think the largect injector our stock ECU can handle is? 30lb injectors the limit? thanks.

310cc injectors are the largest you can run on a stock ECU. Any larger than that and the ECU wont be able to trim the pulse width down at idle enough.

So how much horsepower are 310 injectors good for?

yeah...would 310cc equal about the same as the 30lb accel injectors like Summit sells? if so i think they are good enough for 10 psi, maybe a little higher.

Well, look at it this way. You could, if you wanted, run 15psi or more with 310cc injectors. You would be "force feeding" them just as you would be doing to your stock injectors with a stage 1 and 2 kit. The bonus of having larger injectors is you dont have to run ultra high fuel pressures in order to supply enough fuel. This puts less stress on your fuel pump and will lessen the chance of an injector lock up.

bump

You can run at least 500cc with the ECU and S-AFC.
To run stage 4 or 5 boost levels, you need the Accel DFI to control 625cc injectors.

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so what size injectors are needed for 15-18psi? 370? 440?