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

Upgrading to LT4 injectors?

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Old Jul 18, 2004 | 11:59 AM
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Default Upgrading to LT4 injectors?

I just purchased some used LT4 injectors. Have 96 LT1 w/some bolt-ons will stock pcm trim the mix? Or will I need custom program?
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Old Jul 18, 2004 | 12:12 PM
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I am pretty sure you will have to have the constant changed in the PCM.
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Old Jul 18, 2004 | 02:56 PM
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Originally Posted by MaddMaxx
I am pretty sure you will have to have the constant changed in the PCM.
The LT4 injectors are nearly 4lbs/hr greater in fuel flow. While the PCM may compensate the fuel trims will be skewed to compensate for the added fuel flow that it doesn't know about.

It would be best to have the injector constant tweaked to gain the full benefit of your new injectors.
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Old Jul 18, 2004 | 04:43 PM
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Thanks....
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Old Jul 18, 2004 | 10:36 PM
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"Bolt-ons" on an LT1 won't need any more fuel than the stockers can provide. Don't waste your time.

The stock 24lb/hr injectors can handle an LT4/Hotcam conversion with no issues.
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