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View Full Version : Whats the best race fuel to use?



BuellS1Culver
03-21-2009, 09:06 PM
I've got a 96' S1. Bored, jetted, and a cold air intake. It will still pull at 125 but I want more power without doing any more major work to the bike. I was thinking about using 103 in it, but there are so many other race fuels out there. Which one is the best to use?

maybebuell
03-21-2009, 10:30 PM
race fuel wont give you more power...all you do is retard your burn throw your timing off and run hot..think you will have better luck with correct timing and jetting

chase12s
03-22-2009, 05:31 AM
not directly but it simply allows you to produce more power by allowing higher compression ratios.

teh Nub
03-22-2009, 06:33 PM
The best race fuel to use depends on your compression ratio or pressure/volume of forced induction.

You will have the best performance when your fuel octane is just slightly over the threshold of knock.....

RHYNOXB9R
03-22-2009, 08:48 PM
Look into VP Racing Fuels,they have a fuel for every application you could think of.

Buell_Cru
03-22-2009, 09:26 PM
I used VP4 in my dirtbike a CRF 450R and they claimed a 6hp gain and you could definitely feel it.

maybebuell
03-22-2009, 11:01 PM
question was about post number 1 bike.... not bikes with higher compression bigger motors,,race motors so the answer is no

mtneyman
08-23-2009, 07:33 PM
i use 100 bc i can get it at the pump here in FL, and ive been thinking of trying some of the oxygenated 108.

as long as its not leaded, you should be fine, i guess since vp is gone i cant find 104 around anymore, but i run that oxygenated 108 in my EFI cars,

JUST DONT USE A LEADED FUEL

mtneyman
08-23-2009, 07:36 PM
i guess i left out the important part... i spray a 25 shot on my x1 lightning through a zex cone air filter and use 100 octane with no issuies what so ever, well i do have the occasional "cough" but not at wot, and i think its just happens on a FI Vtwin

skellybuell
08-24-2009, 12:43 AM
The VP race fuel is prob best in my opinion, I know some guys who loved it in their drag car and my father used it in his sporty.

FEN13
10-03-2009, 02:54 AM
VP U42 same as u4 does not gum up in carb. Or 100 octane is cheaper and easier to get.