Power Gain By Switching From 93 To C16?

Copba1t

New Member
Dec 28, 2009
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Roughly how much hp would I gain by switching from a 93 tune to a c16 tune with only messing with the timing and jets in the carb, keeping boost the same? Im running a procharged 393 running 11 lbs making 564/563 off a very basic tune to break my clutch in, goal is 750 and I want to know how much of a gain race gas will give me before uping the boost. Sorry if I sound like a newb, new to forced induction so Im learning about boost in relation to timing in relation to gas octane and all that
 
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a little, but if you aren't going to run more boost you can just mix pump gas 50/50 with c12 for a lot less. I have been told u don't mix c16 by guys at vp. ive done it without issue, but they said it doesn't mix right with pump gas and c12 does.
 
a little, but if you aren't going to run more boost you can just mix pump gas 50/50 with c12 for a lot less. I have been told u don't mix c16 by guys at vp. ive done it without issue, but they said it doesn't mix right with pump gas and c12 does.
I was told something similar...IMO your wasting $$ unless you up the boost and you'll need more boost to make those numbers. It will allow you to get more aggressive with the timing.
 
i havent seen anything different in our set up that would be different we run 160# motorsport injectors and a weldon pump. got to drain the tank though

and yes it smells like fermented monkey piss....
 
av gas is around 120oct
Most av gas you find will be designated 100LL and is 110 octane with a low lead content. It is also blue in color. I would not recommend using this as it's designed to be run at a much higher altitude than our cars operate at.. Also, It is not that much cheaper. I could walk across the runway right now and check to see what it retails at the pump. (Office is located at an airport, lol) They do have a 120 octane version but you will not find very many planes that require it other than some of the circuit racers, etc
 
The major advantage of race gas over pump gas is the consistency. You never know what your getting from one tank to the next with pump gas, while a dedicated race fuel is always the same, so your tune does not have to change. All it takes is one tank of marginal fuel from the gas station to ruin your day.