PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

injector flow rate ques for edit

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Old May 14, 2003 | 09:44 PM
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Default injector flow rate ques for edit

i can't figure out the injector flow rate table for my bigger injectors i have 30 psi injectors but with 58psi pressure i think there rated at 36psi doe's anybody know how to do the math or better yeat have the answer. and last do i have to do the injecter offset table have no idea on that one thanks.
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Old May 15, 2003 | 01:30 AM
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Default Re: injector flow rate ques for edit

Start by finding out how lean your running with the stock injectors, lets say LTFTs are 10% lean
Your going from about 26 lb injectors to lets say 36 lbs.

That is about 33% more flow with new ones
Subtract how lean you are so in this example
33-10 = 23% extra flow is left.
Tuning flow, the smaller the values are then the PCM thinks the injectors are smaller and goes richer, the larger the value, PCM thinks injectors are larger and commmands less fuel.

So in this example your 23% too rich so increase the values by using the multiply command of 123 which is a 23% increase in values, thus would be 23% leaner scaling across the flow table.

I do not suggest mucking with offset, if the injector your using is also a Bosch Multech II design then the internal coil is the same as stock was, you use wrong offset value and that could mean the injector now fires too late after plug coils have been commanded to fire.
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