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2350 Views 7 Replies 6 Participants Last post by 2048 Demon, Aug 19, 2021

1 DEMON

Discussion Starter · Aug 16, 2021

Had my dealer install the crate PCM and high octane button. When I put 100 octane in or 93 octane in, it shows up in blue light that 840 high octane activated. Why would it show that with only 93 octane?

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2048 Demon

· #8 · Aug 19, 2021

hc797 said:
.... and once the ECU detects it, the damage could be done

Knock sensors , exhaust gas temperatures, and O2 sensors protect the engine from operating with detonation. You will need about 8 gallons of MS109 race fuel to 2 gallons of 93 octane unleaded to keep the knock sensors from kicking you out of the high octane mode on the Demon. This has been my experience with my Demon.

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