Originally Posted by cudaman
Whatever kit you get for water/meth injection, make sure that the check valve is warrantied and of good quality. If not, water/meth leaks into your intake or IC when the car is off and you get serious issues. SRTforums has lots of threads about that (SRT-4 related mostly).
Ah, almost forgot to mention -- I had to add a solenoid to my kit, to kick on only when the pump kicks on, otherwise you quickly lose methanol when under vacuum. It has a one way check valve so nothing comes out under boost, but vacuum and siphoning can occur if the nozzle is post TB without a solenoid.
Originally Posted by cudaman
Also, if you tune and your exhaust gas temps are high due to tuning or timing advance, you have to make sure that the water/meth comes on at the right times, ALL the time, or the heat build up can melt a piston or piston ring. Again, this comes from SRTforums, mostly on the SRT-4's.
EGT temps on the SRT-6 may not be as high though, but there can be a downside to water/meth injection if it's not working properly or tuned to come on correctly, especially at high RPMs and temps.
Progressive controller is ONLY way to go. And the Devil's Own setup is pretty easy to wire and easier to tune.
You have to keep in mind, you're not going to get much for HP gains from this. It may be different on a diesel from the way it combusts, but on our cars do not expect that much HP gains just from adding a methanol mixture. Your extra power comes from the ability to safely add other upgrades. For example, I got mine because adding a pulley adds heat, and I wanted to counter that heat. The best place to put the nozzle is the hottest place your intake gets, as it will build boost by flash evaporation on a hot surface. It expanded my air when it evaporated (thus more pressure), then combusted after mixing with fuel with a net higher octane. Basically... this is a more permanent, higher RPM, full time octane boost. If you've ever used octane boost in your vehicle, then you know not to expect any power from the product itself, but more like power from the ability to safely advance your timing without detonation. Since our cars advance timing based on MAP pressure, then if you upgrade your pulley I would recommend this for heat and timing advances.