50lb injector tune with 60lb injectors - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 4 Old 04-14-2019, 03:30 PM Thread Starter
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50lb injector tune with 60lb injectors

i have an old chip from a supercharged fox body that had 50lb injectors that saw about 12psi, could i run that chip with 60lb injectors and matching maf until i get a tune? The turbo is an on3 70mm

thanks

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post #2 of 4 Old 04-24-2019, 01:26 PM
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Matching maf?

You can run anything, whether it will safely is another story

If you think having the wrong injectors installed is no big deal, i dont know what to tell ya.

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89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #3 of 4 Old 04-24-2019, 08:02 PM
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Originally Posted by bravo30 View Post
i have an old chip from a supercharged fox body that had 50lb injectors that saw about 12psi, could i run that chip with 60lb injectors and matching maf until i get a tune? The turbo is an on3 70mm

thanks
A "matched" MAF is just a real poor way to get by with mismatched parts. The injectors are programmed wrong in the computer, so they add a wrong calibration MAF meter to make the engine "think" the air mass is less than it really is. The computer then turns the injectors down to a shorter duty cycle, because the computer thinks the engine is flowing less air.

This sorta works when the injector change is small, because the Ford computer can learn a small correction and store it in the KAM.

You probably have some idea from Internet that the MAF is "matched" to injectors, and that all anyone has to do is buy a magically matched MAF meter. But that makes the LOAD tables and everything else relying on LOAD goes bad, including timing.

It might kind of work out OK for you, or you might pop the engine. It would all depend on your luck. You are probably better off to NOT change the MAF and use the MAF the chip is for, if they tuned it correctly.


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89 LX. 363, single turbo, Super Vic EFI, TFS high port heads by TEA, solid roller, glide. Holley HP EFI. (exact combo varies)
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post #4 of 4 Old 04-24-2019, 09:30 PM
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Load calculations are the more important reason not to use one

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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