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Thread: lt1 obd1 injector size change

  1. #16

  2. #17
    RIP EagleMark's Avatar
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    I need a set of injectors as well, but where to go so the right size and data sheet supplied? These are for a TPI set up on a 383..

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
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  3. #18
    LT1 specialist steveo's Avatar
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    for 'reasonably cheap' but good, i'd look at racetronix's injectors (accel's newer black/silver metal body are **the same injectors**). they seem to have a good spray pattern, good data sheets, and aren't crazy expensive. my last set served me very well.

    ironically for a 383 tpi, buy the LT1 injectors from this guy when he takes them off, since that tpi's VE will fall off on the top end, they'll probably be plenty of fuel.

  4. #19
    Electronic Ignition!
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    how do u Change To Fuel/Air Ratio Vs. RPM at WOT? whats each part of spread sheet mean?

  5. #20

  6. #21
    Electronic Ignition!
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    Quote Originally Posted by steveo View Post
    are you using EE with my xdf file? or is this a '92-93?
    ee with tunercats

  7. #22
    LT1 specialist steveo's Avatar
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    from the tunercat help file:

    WOT % Change To Fuel/Air Ratio Vs. Coolant Temp.
    This table is the percent change to Fuel/Air Ratio used at or near wide-open throttle (WOT) versus coolant temperature. The values from this table and the WOT % Change To Fuel/Air Ratio Vs. RPM are summed to arrive at the WOT Air Fuel ratio.

    The resulting air / fuel ratio can be calculated as follows:

    WOT AFR = 14.7 / (1 + %Change vs Cool/100 + %Change vs RPM/100)

    For the selected RPM, suppose the percent change to Fuel/Air Ratio from the RPM table is = - 5.1 and the percent change to Fuel/Air Ratio from the COOLANT table at the selected coolant temperature is = 22.7, then the approximate WOT AFR would be:

    14.7 / (1 -0.051+.227) = 12.5:1 AFR

  8. #23
    LT1 specialist steveo's Avatar
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    (in other words, higher numbers are more fuel, lower numbers are less fuel..... and a total of 13-14% in rpm and coolant temp tables should be close to a good AFR)

  9. #24
    Fuel Injected!
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    I got my injectors from these guys. Great prices and these people know what their doing.

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