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The motors are designed to run on 87. Unless you do engine mods, pipes, reeds, etc. Just run 87. Don't waste your money on more octane. In all likely hood more octane will make it slower
 

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Originally posted by Mike929@Sep 20 2005, 10:07 PM
They motors are designed to run on 87. Unless you do engine mods, pipes, reeds, etc. Just run 87. Don't waste your money on more octane. In all likely hood more octane will make it slower
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im on a poo 800 classic, has a different setting for reg and premium, goes about 10mph faster when set to premium
 

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That makes sense. It's not the fuel that makes it go 10mph faster. The switch increases timing which then requires more octane so it doesn't melt down
 

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Originally posted by stevefromwestford@Sep 20 2005, 06:09 PM
im on a poo 800 classic, has a different setting for reg and premium, goes about 10mph faster when set to premium
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BS. I did back to back testing with my poos and brothers xc 8 and 2-3 mph was the most.
 

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all cats except the racer sleds run on 87 and always will oh sorry the new 4 stroke turbo will run on 87 but you may get increased performance from the higher octane stuff.
 

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The only way you will get an increase in performance from running higher octane gas is if your sled is detonating on the lower octane gas. The horse power goes way down when detonation occurs, and if you don't catch it soon enough then your engine goes down like a prom queen.
 

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High octane has more power in it if you can burn it all. The only way to get it to burn is to start the burn sooner.....Advance the timing like stated above.....

Higher octane burns slower to prevent detnation. Nitro-methane needs 55* of advance and 200#'s cranking comprestion to burn right. Even then it all don't burn in a 500" big block.

2003F5 If you have no mods like higher comprestion head or timing key you will make more power with lower octane 87. Now if you were to run say 110 octane in you F5 with out mods it will act like it is loading up or too rich......Because you cann't burn it all before the piston is all the way down letting all the exe. out.
 

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Used 87 all season - ran fine. This year I only hope I'll have the jingle to buy it ;)
 
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