It seems as if every test I read on the new Busa and '08 ZX-14 has some sort of mention of U4 fuel. I understand its racing fuel, but what is it? Is it a higher octane fuel? If so, I thought higher octane didn't provide any benefits.
I mean, I assuming the new Busas and 14s were made to run on 87 to 93 octane. If (and I say "if" because I honestly don't know) U4 is a higher octane than 93, wouldn't that mean the Gen1 Busas would run best on 93 octane and not 87?
For the sake of an argument I use "plus" fuel which is 89 octane. Not regular nor premium ... just the middle one on my Gen-1. I'm saying that because I don't want anyone to think I'm trying to get others here to use the highest octane at their local gas station.
I mean, I assuming the new Busas and 14s were made to run on 87 to 93 octane. If (and I say "if" because I honestly don't know) U4 is a higher octane than 93, wouldn't that mean the Gen1 Busas would run best on 93 octane and not 87?
For the sake of an argument I use "plus" fuel which is 89 octane. Not regular nor premium ... just the middle one on my Gen-1. I'm saying that because I don't want anyone to think I'm trying to get others here to use the highest octane at their local gas station.