Meth water mix
 

How much water do you run with your meth' injection system?

1 none

2 25%

3 50%

4 75%

5 all water - mo meth'

6 some other cocktail

I have been running 100% Meth but I am thinking about switching to 50/50 mix. I am not trying to get more power, I just want whichever will give me the best detonation prevention. I have yet to see anyone prove which way is better.

i run a 66/33 meth/water mix on mine. The reason I use the water is the meth was boiling and vapor locking the pump on hot days. Adding 1/3rd water raises the boiling point high enough that it's not a problem. My meth tank is in the engine bay.

Pure meth here. The reasons are the opposite of why Zombie uses a water mix. I don't live in hot high altitude hell, so a water mix won't flash off properly on my combo, causing a bog. Pure meth vaporizes properly, giving no bog and great cooling.

You notice an issue with the burn on an 66% meth 33% water mix? I wouldn't think that mix would cause any issues since it's still flamable. I only spray a little for some added cooling / safety in the summer months though, maybe you are using a lot more than I am. I'll see a 60-70 degree drop in intake temps when it's 115 out side and my IAT's are 160 degrees. On 100% meth i've seen 80-90 degree drops in those same conditions. Having < 5% humidity makes the intercooler work overtime to cool the charge by itself in the summer. One thing I've noticed is the hotter the IAT's the better the methanol works to cool it. On a 60 degree day with 75 degree IATs i'll only see about a 25 degree drop.

Vegas is BRUTAL on a turbo car. All the meth in the world won't fix our 7000+ summer DA's though :(

i run straight VP M1

I'm in process of building a new motor and adding meth. I bought the alkycontrol kit and plan to run 100% meth (VP M1). From the research I've put in....the benefits of full meth seem to be better. Always getting the same amount of meth and not dealing with the possibility of a "different" mixture is what I feel is the way to go. Not to mention, just a lot easier. :D

can;t you just run windsheild wiper fluid? thats like a 50/50mix i think. your mix would always be the same.

or am i way off here? is that a bad idea to run the windshield fluid?

I would definitely agree from a power perspective, but I am not sure 100% meth is the best for detonation prevention. Does anyone have hard fact evidence on which is better for detonation prevention?

You don't necessarily want what is the absolute BEST at preventing detonation. You want what makes the most power from you combo without detonating. The easiest way I can explain this is that with enough compression and boost, pure meth could even detonate. Water NEVER will, as it won't even burn. However, sticking your garden hose in the intake won't exactly help power. As my previous post and Zombie's posts have explained, different situations benefit from different mixes (or no mix at all sometimes).

I would say that because you're preventing detonation by both lowering the intake charge temperature AND increasing effective octane, using 100% methanol is a better choice. Adding water to the methanol will reduce the final octane of your fuel mixture when compared to straight alcohol.

This assumes that you're using normal gas 91-93 octane, and that you don't have a Death Valley scenario like Zombie's.

I hope not! :jest: I've been running strait -20* windshield washer fluid for a couple years now and probable put 30+ gallons though it. It works for me running 12lbs and 18* of timing with 91 pump gas on my 4.8. It's making 505/533 at the wheels. :)

A friend of mine had an 6L diesel F350 and used washer fluid, didnt hurt it just gave it a good kick in the ass when he mashed the pedal....it was tuned with a spearco IC but ya I couldnt believe it, might have to watch out for ones with teflon or detergents though....but it is cheap

I've been running strait -20* windshield washer fluid
same here

Water has infinite octane, your not lowering it, your raising it with water. Octane rating is based on resistance to detonation, havent seen water detonate yet :jest:

I see your point, but I kinda thought octane ratings only apply to combustibles; we're talking about resistance to detonation of fuels, not inert compounds.

So to be more specific, I guess the final fuel mixture in the cylinder using a 50:50 mix would have an aggregate higher octane but lower energy content than the final fuel mixture using 100% methanol.

Has anybody tested 50:50 vs. pure methanol on the dyno, back to back? Now I'm curious.

Bingo!

Water has no octane rating and neither does methanol. I believe it's lacking the proper molecular chain that they use to measure octane. Octane is the chain they chose to measure knock resistance and is more resistant to detonation than n-heptane... something like that.

I could be wrong since it's been a while since I read about this stuff... anyone a chemist?

*edit*
some info on octane and the isomer they use to measure.
http://en.wikipedia.org/wiki/2%2C2%2C4-trimethylpentane
http://en.wikipedia.org/wiki/Octane

I'm a biochemist, but that's not really close enough, is it? ;)

I'm a little surprised that nobody's ever tried them back-to-back on the dyno... Maybe I'll give it a try the next time the car is strapped down... although with the amount that I spray, I wonder if I might go a little bit lean.

i will most likely run a 50/50 mix since that is whats recommended.. the pump that comes in the snow performance kit has a warning label on it that says do not run more then a 50/50 mix because it is flammable.. just figured id throw that in