Quote:
Originally Posted by Fresh86
Hey I have a question? I just purchased mine a few days ago and Here where I live we don't have 93 octane ... we have 91 or 94...could i use 94 on the 93 tune and be fine?
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for a tune designed for 93 octane obviously 93 would be fine
94 would be best as it has more knock resistance hence ECU will run full timing advance and produce best power, won't produce any more power as tune will produce this on 93 (assuming no knock encounter on 93, IAM should be =1 on 93 or 94.
91 will work but ECU will likely detect knock, reduce timing advance (IAM less than 1) thus reducing power. Won't damage anything but you will not get the maximum benefit from the tune.
even the factory tune is designed for 93 for max power, will run on 91 but at reduced power due knock retard IAM less than 1 in most cases.
IAM = Ignition advance multiplier can be monitored on OFT or other logging device if its less than 1 indicates knock encounted and ignition timing has been retarded by ECU (ie advance reduced) to compensate for lower octane fuel.