C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old Apr 13, 2006 | 12:29 AM
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What do I change to lean or richen my 85 MAF car?
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Old Apr 13, 2006 | 11:13 AM
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More detail would help on this. Its the 383 ? I will say you could adjust fuel pressure or change the injector constant for an overall adjustment if your not running closed loop.
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Old Apr 13, 2006 | 12:26 PM
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Yes, it is a 383 and no AFPR. I have all the stuff to edit and burn chips but I don't have the first clue what to change to get the car to lean out some.
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Old Apr 13, 2006 | 01:15 PM
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The injector constant would be the first (and easiest) item to change to universally increase or decrease fuel. Increase the number to lean out, decrease to richen up.

What are you using / seeing to determine that it is running rich? Low INT / BLM numbers, high O2 sensor voltage, fouled plugs, etc...?
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Old Apr 13, 2006 | 02:58 PM
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Originally Posted by byebyeL98
The injector constant would be the first (and easiest) item to change to universally increase or decrease fuel. Increase the number to lean out, decrease to richen up.

What are you using / seeing to determine that it is running rich? Low INT / BLM numbers, high O2 sensor voltage, fouled plugs, etc...?
BLM's in the low 120s and O2 voltage up around .800 volts. What is the injector constant called on an 85? It has the 870 ECM and I don't see anything called injector constant. On my 90 I see something that is called injector flow rate.
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Old Apr 13, 2006 | 05:50 PM
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$1F Hmm I looked at it definately has no injector constant in that definition. Has to be a table. Just a guess here but Injector offset vs battery voltage sounds like it would make a global change.
Anyone with expereince on these $1Fs know where to start ?
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