Whats the best race fuel to use?

[BuellS1Culver]

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?

 

[chase12s]

not directly but it simply allows you to produce more power by allowing higher compression ratios.

 

[teh Nub]

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]

Look into VP Racing Fuels,they have a fuel for every application you could think of.

 

[Buell_Cru]

I used VP4 in my dirtbike a CRF 450R and they claimed a 6hp gain and you could definitely feel it.

 

[maybebuell]

question was about post number 1 bike.... not bikes with higher compression bigger motors,,race motors so the answer is no

 

[mtneyman]

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]

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]

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]

VP U42 same as u4 does not gum up in carb. Or 100 octane is cheaper and easier to get.