04-11-2022, 06:52 AM
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#78
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Drives: 13 CAMARO 2SS LS3-04 SILVERADO LS3
Join Date: Dec 2021
Location: SOUTHERN MARYLAND
Posts: 801
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Quote:
Originally Posted by FasNuf
It's simple. GM designed the ECM to use a high octane table for 91 octane or better which the engine is tuned to run as engineered. The low octane table GM put in as a safety margin incase you had 87 or better in the tank by mistake or necessity. The Low table is referenced only after the knock sensors detect knock. When it hears knock, it references the low table and pulls timing to reduce the knocking.
It does not sense what octane gas your running and reference the low table.
It first has to hear knock and knock isn't good for a gas engine.This also reduces the power.
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Exactly!
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