Quote:
Originally posted by dpeete
I know nothing about JetChips, but in general the ECU tuning involves:
More timing advance, which means 91+ octane.
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Not necessarily. My Ford 7.5L EFI motor will tolerate 4 degrees of timing advance on 87 octane with no pinging. And the 4 degrees IS noticable. The same for the 1st Gen Lightnings ('93-95), which can tolerate 2 degrees on 87 oct. and 4 deg on midgrade 89. Two degrees doesn't sound like much, but it can add 5-10 hp.
Generally vehicles operated in cooler and/or more humid areas can tolerate more advance before needing premium.