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The mkiv Supra Owners Club

Race fuel info


jevansio
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After Jamie's impressive results I'm looking at which race fuel to get to go with my new turbo.

 

Can any one clarify the difference between the Unleaded Race Fuels (http://www.aaoil.co.uk/racing-Racing-fuels-Unleaded) and the Chemical Race Fuels (http://www.aaoil.co.uk/racing-Racing-fuels-Methane) from the Sunoco site.

 

I'm after info such as which are safe to use for our cars, can you mix with regular fuel or do you use neat as provided, which provides the best performance, and which provides the best performance per buck.

 

For example 50l of Sunoco Racing Methanol is £120 vs 25l Sunoco 109 + 25l V-Power. Which would be better?

 

Be interested to hear opinions on what would suit me best, it's a weekend toy, but will be run on regular V-Power mostly (this will be a special day fuel).

 

The car setup with be T67 Billet, AEM, -8 fuel, HKS rail, 880cc inj, twin walbros and mapped specifically for the fuel.

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Forget the methanol, that's for specialised engines running LOTS of squashy with specialised fuel systems, totally unsuitable for your needs. If you cn live with no O2 sensor once mapped a leaded fuel will give the best protection. Yo can even use leaded WITH a wideband, but sensor life will be reduced considerably. Go with a specific turbo fuel, and as much octane as you can afford. The more octane the more advance and the crisper the response, plus the more boost it will take before det. That's not to say the engine isn't air flow rom the turbo, or mechanically limited as to how much boost is safe or efficient!

 

You can mix fuels, too, if you want, but if you are having dual maps just map on turbo fuel and on SU. A cheap alternative that adds some octane is to run 50 / 50 by volume Avgas 100LL and SU. Although sold as LL (Low Lead) it still has plenty enough to kill an O2 sensor, long term. The mix will be nothing like a specific turbo blend though. The right fuel, with correct mapping and hardware, will transform the power curve :) At a price....

 

260 GTX if on a budget. 260 GT 109 octane for something radical. You can go up to about 118 octane with some race fuels.

Edited by Chris Wilson (see edit history)
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