Stage 3 Race gas with Meth injection

[Big Boost]

I searched the forums with no luck, so my question is has anyone ever ran their S4's with both race gas and meth injection? I am wondering because I want to know if there is a diminishing return on the octane rating. If not, can a race file with meth allow for further tuning (i.e. more timing)?

[Ko4S4WI]

I searched the forums with no luck, so my question is has anyone ever ran their S4's with both race gas and meth injection? I am wondering because I want to know if there is a diminishing return on the octane rating. If not, can a race file with meth allow for further tuning (i.e. more timing)?

Timing would probably remain the same, but you will get the added benefits of a cooler intake charge with the meth/water.

[Don Supreme]

I asked the same question a few months ago and I received the following reply:

There is no "supposedly" about it. We're not talking about boosting the chemical compound called octane (which gasoline may or may not actually contain depending on the formulation). The whole point is about increasing the the air/fuel charge's octane rating.

As an experiment take a spray bottle and mist your kitchen stove's burner with pure water (hard squeeze on finest setting). You'll see the flame level dip down as the combustion process is slowed. This is exactly what happens in the combustion chambers. It's precisely what high-octane gasoline does.

Under the worst case scenario low-octane fuel burns explosively (a.k.a. "detonation") instead of in a slow, smooth, and sustained manner. High-octane fuel behaves the opposite way. So, there is a solid but gentle "shove" on the piston.

WAI makes low-octane fuel burn slower because of the water present in the mixture. It also expands in volume by 1000x or more as the stuff evaporates from liquid to gas. This increases cylinder pressures like a steam engine. Carbon deposits (which would otherwise glow red and facilitate pre-ignition) are also steam cleaned out of the chamber and blown out the exhaust.



The octane rating will jump by the same amount as it would with say... 87 octane fuel. Added to some 104, it would end up at beyond 115, etc, depending on how much you spray. WAI's limitations are mostly tied to equal distribution and precisely timing the delivery. IF you get both those factors 100% correct, the effects are equivalent and often superior to C16 race fuel, etc.

Got more questions? Let me know. I'll be happy to answer. :thumbup:

[Big Boost]

That's what I needed to know. THANKS!!!