Meth injection is not a power adder. It is a supporting modification. Meth on it's own really doesnt make any power, but the increased timing and boost that you can run can make a remarkable difference in power. If I recall...meth in a 0% dilution is around 114 octane. So to some extent, it's like spraying octane booster when you need it. Also the latent heat absorbtion is very effective on a 50/50 mix. The most common meth used was the stuff from walmart. It was .97 cents a gallon, had no soap and the msds showed somewhere around 42% meth. I have run cases of that stuff with no problem what-so-ever.
Meth is injected for the most part through a fixed oriface under very high pressure. Sometimes up to 220 psi for race engines. For your everyday meth kit, the Shur-Flo brand pump that everyone uses are pushing anywhere from 100-150 psi. They come preset with pressure cutoffs made into the pump, but are somewhat adjustable. The jets are rated in gallons per hour. I used a 7 gph nozzle in mine and ran up to 30 psi of boost at the strip. Very little timing was pulled even when high octane mode was used.
SRT4's and S4's alike seem to be similar in the fact that the power is in the ignition timing. Running logs in the neon would almost always show big and consistant changes in my allowed timing advance. This of course translates into big power. Safe Power. A few degrees of timing would always net more power than a few psi of boost in my car. The S4 seems to follow suit.
Chemical intercooling will always net lower intake air charge temps then air to air intercoolingwhen done right. But this being said, I could never get my air charge temps as consitant when I did not run the big cca front mount. I would not rec running neth alone unless 1. You have a redundant stlye pumping method. When the pump goes, so will you ring lands, and 2. Tune it on a dyno under different ambient temps to make sure you timing stays in the safe range.
A few good sights on this are also vendors, Devils Own, whom I have delt with, stands behind his product so relentlessly, that when he finds a way to make a part better, he sends it to you! Cooling Mist is also a very reputable vendor, has a good product, but from the forums, seems to be lacking in customer service a little. Snow Performance which I have never had dealings with, also has a very good reputation.
If you are chipped, I say that you will see a differnce. Mostly with APR as in my circumstance. They seem to program alot of timing in there 93 oct program. Also I know for a fact that you can run their 100 oct race setting on 93 octane with an m5 nozzle ona 1.8 GTi.
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Originally Posted by Don Supreme
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