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Running Skyline on low octane fuel

Duncan

By Duncan,
in R Series (R30, R31, R32, R33, R34)

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Kinks Grand Master

Kinks

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Posted

Good move Duncan. I think it's just easier to earn more money than to fart around trying to do stuff yourself (I'm doing the latter atm!). "Learning experience" or some shit. Yeah, once I've learnt I'll just pay someone else to do it in future :D

darkhalf Community Regular

darkhalf

Posted
Posted
My understanding is that Rb25s, and presumably other skyline motors have knock sensors in the block. When the stock ECU detects knock it retards timing, reducing power and preventing further knocking.

hmm it kinda works that way. i've seen from consult logs that there is also fuel enrichment done also as well as decreases in ignition timing. there is also a limit on how much knocking can occur before the ECU will then uses the low octane fuel/ignition maps instead of the high octane maps.

(the high octane maps contain a flag where to listen for knocking in certain low/rev ranges and if knocking is detected beyond a certain limit that is where the software apparently switches maps)

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