100 octane KA

[racepar1]

Originally Posted by s0apgun

so you're saying

if i put 93 octane in my stock ka i'm actually losing power..

so putting 87 in my tank is actually better

some one hit me with some knowledge

Ka's are supposed to run on 91 octane, that is what you should run. I get a bit of pinging in hot weather from 87 octane, so I stick with 91. I doubt you will lose anything with 93 octane, but with 110 octane you probably will.

Originally Posted by Def

This thread is full of fail.


Combustion rate is NOT directly related to octane rating of a fuel. There is some race gas that has a faster combustion rate than normal pump gas, and some that has a slower combustion rate of the gas. VP Import stuff in particular touts its higher combustion rate to enable a small increase in power at very high RPM(<8000 RPM).

In all cases, no. Generally speaking though higher octane means slower combustion. You can get race gas that will burn as fast or faster then pump gas, but most race fuels don't. What higher octane really means is a higher resistance to combustion. It takes higher cylinder pressures and/or temperatures to burn higher octane fuels efficiently then it does to burn pump gas efficiently.