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Which octane rating?

Old 02-26-2006, 02:25 AM
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Default Which octane rating?

I was just curious if I swap upto a B16a2 or a B18C if I have to start using premium fuel?
Old 02-26-2006, 04:09 PM
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Default RE: Which octane rating?

Yeah, I think so due to the compression.

You could retard the timming and run lower octane but then people might question if your brain is 8* behind TDC too.
Old 02-26-2006, 07:37 PM
Join Date: Dec 2005
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Default RE: Which octane rating?

i have a 99 si, and in the owners manual it says for the si (b16a2) premium fuel, ive never ran anything else so i cant tell u the difference, but yes run premium
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