eman930

So I've been checking this out over the past couple weeks, To me it sounds like it would work great on our cars, How many of you guys are running meth injection, What's your experience with it? And what kinda improvements do you see? I'm just trying to get a feel for it before I dive in.

CyCloNe!

Curious to hear on this as well since e85 isnt very available I was considering this too

eman930

Everything I've been reading and watching about water/meth injection it's all a big plus, There are some really well made kits for like $200-$300, you get the knock protection from the meth and cooling from the water... Seems like a no brainer to me... I'm surprised I haven't seen more post on it

Charlie944

Hello,

I have a water/meth injection kit on my Callaway 944. I purchased the kit to reduce EGT's at the track and play around with timing. Unfortunately, I have not had a lot of seat time these past couple years and the car has mostly sat. See this link for some pictures and more info:

https://rennlist.com/forums/944-turb...er-meth-2.html

LUCKY DAVE

I'm surprised ALL of the forced induction hot rodding crowd hasn't embraced water/meth spray, it's such a no brainer.
My experience with it is with an engine that admittedly runs a lot harder than any 951, (383 hp/litre, 13 psi with heavy nitrous) but we saw over 100F temp reduction in the plenum with it, and 60-ish horsepower increase on the dyno.
The increased effective octane allowed us to be more confident (braver) with the tune as well. This engine runs the Texas Mile, so it's no flash-pull dyno queen, and is even run on the street on occasion.
Just don't forget that the meth is fuel, you can't turn it on and off without it affecting the tune.

eman930

Yea I've been reading Alot about the tuning, I don't have a way to control timing advance or alter fueling, I basically just want it for the knock protection and cooling the charge a bit, Rihjt now I'm running about 17psi on a 26/8 turbo, and 951Max chips, MBC and so on. Do you guys think I should start with just water, or do a 50/50 blend? Id like to up the boost to maye 18psi... I know im pushing the limits of this little turbo.

rlets

I ran water injection on my old Audi 5-cylinder turbo track car. It worked great as the intercooler was inadequate on that car and there was nowhere to put a bigger/better one. With the water injector located right after the intercooler we tuned the timing much more aggressively. And it kept intake temps below the 140 F point where the Audi computer would run out of timing adjustment. The car pulled much better down the straights.

The issue was knowing when the water tank ran out. Without the water, the engine would quickly have pinged itself to death. I was using the washer fluid bottle which would last 12-15 laps and then pop the warning light on the dash. Perfect!

Rich

86 951 Driver

Do the Nitrous route.

LUCKY DAVE

It should be pretty simple to trigger the water with a MAP sensor. Testing would show when you need the water to start, and all-or-nothing flow is probably close enough for a comparatively low power street car application.
Sure, it's more elegant to have pulse width modulation spray like we do on our land speed engine (we need perfectly sorted throttle response to keep the tire hooked up, even the smallest random surging would hurt our traction which is tenuous at best), but we're running a custom Mega Squirt ECU to control everything.
All that is too much trouble - and not worth it - on a car.

eman930

The only thing Preventing me from using the Zex nitrous kit I have is the kits a dry kit and I'm already pushing the limits of my stock fuel system and already have the FQS at %3 more fuel

Tom M'Guinn

I'd probably start by gaining control over fuel, timing and boost. That will allow you to get more out of the water/meth injection, but no question it can allow more boost without more knock even without having control over timing and fuel. I can vouch for the Aquamist HFS-4 system and for Howerton Engineering.

http://howertonengineering.com/produ...quamist-hfs-4/

Aquamist's system has a programmable injector, a fairly advanced controller to program it, a true fail-safe system, and a nice gauge. They also have all the fittings you'll ever need, including parts to retro-fit the wiper fluid tank to hold the fluid. Boost Juice from Snow is a convenient way to get a water/meth mix, which does make more power than water alone...