I've had a lot of experience with alcohol/meth injection. I ran it on by 7MGTE on two different turbo setups, and I ran it on my 2JZGE-T setup.
The amount of power you can gain (by proper fueling/timing/boost) is going to be dependent on the amount of meth you inject.
Please read the next information I provide with caution.
Cliffs at bottom.
Methanol injection adds more octane to the mixture, water/methanol.. same thing just less octane. Water injection will lower IAT's and prevent some detonation. I have had great luck with 100% methanol.
I was speaking with a member about two years ago, when I told him I was running methanol injection, he insisted that I was going to make less power because of it. He tells me that a VERY well known 7M member on this forum dynoed on his meth injection setup, and then dynoed without the methanol kit and instead ran racegas. He made more power per PSI on racegas. The difference was pretty supprising. I knew what I had in mind so I said 'whatever' and went along my way.
Let's jump forward a year.
I take my car to the dyno. I've done a lot of re-search and street tuning to my 2JZGE-T setup, and found what I feel is a very comfortable, conservative timing map, and all my air fuels are dead on. There was nothing about my engine that I felt was under par, so I knew that I would be putting down some decent numbers. Long story short I didn't.. I did 450whp at 26psi or something ridiculous like that..
Knowing that my setup was solid, I was baffled. I knew it had to be the tune. I was working with the Stinger EMS, so I took advantage of that and added in a couple degrees of timing to my already "perfect" timing map. Using det-cans I could tell that I didn't hear anything out of the usual, but the car pulled amazingly harder than before. I decided to run up to the dyno, having changed nothing but a couple degrees of timing.
The dyno operator could'nt believe I was back. He said "you change anything?" I said "yup, I added a couple degrees timing". We both laughed and he strapped the car down, didn't thinking we'd see any gains that day.
First dyno pull 20-21 psi was 615whp, 27.5 was 677whp.
CLIFFS: TUNING and TIMING are crucial. Of course your 7MGTE running on a PIGGYBACK and the stock ECU are going to net more HP on racegas, you need proper tuning. You really can't just tune the AFR's and call it a day with any DECENT ammount of methanol injection. It WILL kill your power.
About tuning- not all tuners are experienced with methnanol, I sure as well wasn't. I was willing to push it to find where my timing needed to be.. only because I built the car, so I knew everything was solid, and I was listening for detonation. Don't take it to a tuner who is inexperienced. If they don't have a feel for methanol, you don't want them pushing the limits on your car without the proper detonation detection (which a lot of tuners don't use).
The smaller the nozzle you use, the less important having timing control is, but also the less boost you can run. It's a trade off.
**Please note that the timing numbers I threw into my personal dyno story are NOT going to be safe on your car. Just because you're running methanol and your numbers are below what you think they should be, doesn't mean your car will react the same way. I was running double the suggested volume of methanol on a very calculated setup.**
I hope this helps, sorry for the long post. Don't PM me with methanol questions, post them and send me a link.
