methanol injection on n/a

not really.

the advantage of meth/alch/h2o injection is to cool down the air charge, and depending on whats injected, help increase the octane rating of the overall fuel charge, which will aide against knock/predetonation. this in turns means you can run more timing and lean out the mix, or add more boost.

i dont really see its advantages n/a unless youre fully fledged n/a with high compression, awesome cams and whatnot, and at that point its probably a track only vehicle, so you might as well be looking into running straight methanol anyways.

thomas91169 said:

not really.

the advantage of meth/alch/h2o injection is to cool down the air charge, and depending on whats injected, help increase the octane rating of the overall fuel charge, which will aide against knock/predetonation. this in turns means you can run more timing and lean out the mix, or add more boost.

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Now wait a second here. You are right in that the intent is to cool down the incoming air.. definately.

But the octane rating is of the gasoline. Cooling down the air before it hits the intake does exactly that, cools the air down. Recall, the octane rating is in a nutshell the ability of the gasoline to resist spontaneously combusting. Air doesn't spontaneously combust, so really cold (or really hot) with gas doesn't change the properties of the orignal gasoline. But as you said, it can help against detonation.

Now, as far as doing this N/A, I would think very very minimal gains from trying this. Everyone knows cooler air = denser.. so probably would result in the gains you'd see driving in a really cold day with that really cold air all the time.

sgarlic said:

But the octane rating is of the gasoline. Cooling down the air before it hits the intake does exactly that, cools the air down. Recall, the octane rating is in a nutshell the ability of the gasoline to resist spontaneously combusting. Air doesn't spontaneously combust, so really cold (or really hot) with gas doesn't change the properties of the orignal gasoline. But as you said, it can help against detonation.

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yes, but depending on what you inject, be it alcohol, methanol, etc., it will raise the overall fuel charge octane rating (standard fuel used + whatever is injected = overall fuel charge). so if you run 91 octane and then whatever you are injecting will help raise the overall octane rating.

It actualy does raise the oct of gas, Alternative Auto Performance is big into this and they even say running 93 with meth it increases it to 110 oct. Check it out.

http://www.alternativeauto.com/waterbox/waterbox_main.html

I looked it to this for my car but I saw so many guys losing there engines I decided to just do an IC.