[Christ]

mfor4x4 - is he running propane as an additive or a primary fuel?

I ask because you can use propane to quench detonation when the fuel system can't handle the amount of airflow you get from the turbo. Alot of diesel performance companies also provide propane kits and nitrous kits that you use in tandem... it creates an almost infinite power adder... since you can turn up the compressed fuel and air until the engine just can't hold any more. (Nitrous is an oxidizer, for those that don't know... if you use too much, you lean out the mixture, which can cause engine damage... add propane as a fuel, and you're good again. Same applies for boosting beyond the fuel system's capabilities.)

BTW, cheap race fuel = add Xylol to your gas. It's already in there naturally, and has 117 Octane rating... do the math.