S2k6262

aquamist dds3 v8 hands down

s2000Junky

I've got approximately 50k miles on water/meth in the 3-4 years Ive been running it, so take my input as you will. In my experience spraying just water on a Centrifugal SC isn't efficient in achieving what you want. Its better suited for inefficient turbo applications or roots blowers where AIT and EGT are serious challenges, there aren't as significant a challenge on a properly after cooled Centrifugal system. I recommend 50/50 water/meth at most and I prefer a stronger mix of meth in the 75% range or above for several reasons. Water cools better then meth which is great for detonation suppressant, but meth also cools, water doesn't burn which sucks for power and can overburden your spark(blowout at a lower power limit), meth does burn. Both do effectively the same thing, but each one has its own strengths in doing it better. Fitting the blend % with the application is key. A centrifugal not only produces less heat then any other FI system, it requires less timing retard to control detonation on our car due to the nature of the blower boost characteristics and the inline 4 power curve.

One example, with my multi port injection, I have detected no detonation running 15psi on my stock 11:1 f22 with stock timing advance (28 degrees?) With a mix of 20% water. I have not logged my AIT but considering the feel of my manifold its under 150 typically. If I were to add any additional water to my mix, I may be able to squeeze out a few degrees lower Ait temp, but at the cost of power becuase I still haven't reached a detonation threshold which is really the basis. In order to even justify a 50/50 blend I would be in the 20's boost range the way I figure it, that would still be running close to stock timing. Obviously a single port wont give you this level of performance ability, which brings me to the next angle, generally the more cc you run, the less water % in the mix. Its all about finding the right balance between, water/meth%.CC amount and timing correction for the boost run. Hopefully my experience has brought you closer to discovering what that is for our application.

Modiction, for your set up, I'd likely go with a simple non progressive kit as I described previously. Run no less then 50% meth and 75% would likely be best. Run a single pre TB nozzle( which AEM sells individually) which reminds me, I have one for sale if your interested. Run the larger 550cc nozzle with it. You could go with the next size smaller med 315cc, but divided by 4 cylinders you would just be pissing on a fire, not worth the trouble. I'm running one 180cc injector/nozzle per cylinder.

siadam

I'm running 180 * 4 as well, and was making over 650whp, progressive coolingmist kit.

LandR

Sorry to resurrect an old thread but wanted some clarity around Matt's comments. So if you run meth/water and don't advance timing/increase boost you will see a drop in power? I would think lower IATs would increase power?

Thanks
Sam

EternalLx

meth is a fuel if you dont do anything with added fuel the a/f will become super rich = less power.

wadzii

I have used a hobbs switch to add a fail safe to meth injection. Put the pressure switch right by the nozzle, so when there is a loss of pressure it cuts boost or you could use it to activate the 2step, or turn on a light on the dash.

o'malley_808

I have my failsafe set to the boost switch input so I am limited to 10psi if there are any errors.

Deception

I was recently looking at the aquamist (stage3?) kit and it looks pretty solid, even has a built in flow gauge & I think it sprays via its own injector rather than just a nozzle & check valve. It also has telephone/cat5 style connectors for all the wiring which looks awesome. I can see why it costs 2x what the AEM kit does.
But I have already lost one motor to a failed meth kit (AEM) & would feel like a total jackass if I did it again.
decisions, decisions

camuman

ask yourself why you would want to spray water/meth.

Deception

The pulley I have hits 15psi at 8500rpm, probably about 16psi @ 9k..
But above 13psi/ 8100rpm I get some knock so we pulled a good bit of timing and set the limiter at 8100.. I need higher octane so i can rev to 8.5 or 9k & also pickup some power lost to the timing retard. Maybe even run a smaller pulley. Having to shift at 8k sucks, I lose almost 10mph in each gear.

Ive been debating between E85/ meth or premixing 93 gasoline w/ toluene to make +100 octane