[Titleist71]

my pump is in the trunk....away from excess heat. Plus I utilize the factory water tank to hold the meth and I utilize the low level light so I know when my meth is low

[Flycaster]

Originally Posted by SVT Amateur

Nah, .5 is not bad at all.

I concur, I thought you were, like most of us, dumping the stuff in. I take it, however, that once you tune it apprpriately you'll be upping the volume "significantly?"

[Titleist71]

lol...I'm using a 600+ jet from Snow Perf. It's the largest jet available lolol.

[Turbineguy]

Yeah in the trunk would def be nice but the Aquamist kit I got has a module that taps into the signal wire of one of the injectors and then plugs into another module with a relay that plugs into the pump. In order to mount the pump in the trunk I would have to extend and plumb a bunch of extra wiring. Maybe I'm just lazy or something. Anyone suspect any issues with having the pump under the hood?

[520]

no issues here with my smc kit pump unda da hood.

[flatthump]

I dont see the point of doing that without a tune.

Your cylinder temps WILL go down but I cant see that affecting performance much.

Water/meth is a "tool" that allows a tuner to run more agressive AFR's and timing curves. So without the tune, you just have the "tool" which, I believe, is useless without a tune.

[Turbineguy]

As long as the heat doesn't eat my pump I'll leave it where it is. Whats the best way to test the system? I was thinking about getting everything hooked up and rather than mount the nozzle in the IC I'll stick it up under the passenger side wiper and and go for a drive. Sound reasonable or should I leave it all up to the tuner? Maybe I'm just trying to find reasons not to drill a hole in an $800 IC.

[TitanSTI]

ive been running mine on 100% water for the last couple days just to make sure the system is working right before my tune. ive been checking the water level and all the fittings for leaks after every drive. so far so good. so im probably just going to unplug the boost line from the controller until my tune on the 21st. then 50/50 meth to water and ill be a happy camper!

[Titleist71]

^^ don't unplug your vac. line or you'll have a vac. leak. Disconnect the controller so it won't turn on.

[2fas4u]

Originally Posted by flatthump

I dont see the point of doing that without a tune.

Your cylinder temps WILL go down but I cant see that affecting performance much.

Water/meth is a "tool" that allows a tuner to run more agressive AFR's and timing curves. So without the tune, you just have the "tool" which, I believe, is useless without a tune.

Whaa??? Its a change in chemical reactions that effect EGT and AFR. As temps go down that changes many important ingredients in the engine. Thats the whole point of the tune. Because of lower effective octane, lower temps, the AFR, timing and minor other areas will need to be adjusted. One knock event is enough to ruine the engine, if your willing to chance it, go for it!

[RainMaker]

Originally Posted by 2fas4u

Whaa??? Its a change in chemical reactions that effect EGT and AFR. As temps go down that changes many important ingredients in the engine. Thats the whole point of the tune. Because of lower effective octane, lower temps, the AFR, timing and minor other areas will need to be adjusted. One knock event is enough to ruine the engine, if your willing to chance it, go for it!

So Im interested a little, here...

Methanol evaporates (due to its very low boiling point) in the intake charge (typically) before it gets to the cylinder. It lowers the intake charge temp. Water, on the other hand, is usually still (for the most part) in droplet form when it gets into the cylinder. The water lowers the combustion temperature. The methanol slightly (very slightly) as a chemical, ups the "effective" octane of the fuel air mixture. The water... I *believe*, makes little change to the effective octane of the mixture, but by allowing lower combustion temps, catalyzes an effective "octane" rise. (If you stick to octane meaning the percentage of an 8-carbon long hydrocarbon, I know Im being sloppy).

I guess Im missing which of those two parts will cause detonation.
A less efficient combustion, perhaps... and the 50/50 also displaces oxygen that could be used... and hence the loss of HP without any other changes.
But given the coice between testing the 50/50 injection by tying a jet to my cowl ("Look, when i hit 10 psi I get a wet window!"), I dont see any other good way to try out the WI. PDXTuning installed the system, and both Jarrad and Tim know what Im doing... We all agree that Ive lost about 20hp until Tim tunes it.. and maybe gained some cleaner piston tops.

Im concerned that the reaction to WI use on an untuned engine is a little overboard... but I'm willing to learn.

[2fas4u]

not sloppy I know where your headed , yeah that probably true, I am a cautious person so yes it alarms me a bit. Should you not do it? Thats your call, don't think your going to topedo your motor while waiting, but I would'nt do it. Good luck with the installation!!

[flatthump]

Originally Posted by 2fas4u

Whaa??? Its a change in chemical reactions that effect EGT and AFR. As temps go down that changes many important ingredients in the engine. Thats the whole point of the tune. Because of lower effective octane, lower temps, the AFR, timing and minor other areas will need to be adjusted. One knock event is enough to ruine the engine, if your willing to chance it, go for it!

Oh...Alright.

[Flycaster]

Originally Posted by RainMaker

Methanol evaporates (due to its very low boiling point) in the intake charge (typically) before it gets to the cylinder.

It may "evaporate", but the volatile chemicals and octane don't "dissappear." Regardless, your point about water only is well taken. PDXT says that water injection lowers the effective octane such that they can only make the same power as without it, and that is by timing advance and increased boost due to the det. protection provided by the lower intake charges. Rethinking this leads me to the conclusion that adding it to a "safe" tune will probably result in litte risk, just lower power.

OTOH, with a 50-50 mix, they can actually increase power since they not only have the cooling effect fo the water, but they also get much [all?] of the octane back by the addition of the methanol.

[jays05]

I've been running water injection since not long after my GT35R setup went on. It easily lost 20-30whp. I did it for safety since I've been doing all of the tuning work myself and really don't feel like replacing the motor just yet. Even with the power loss it's still more than enough power for me (for now).