am thinking about this water meth injection good or bad????? anyone know what i should expect hp wise? i assume if i run out I'm just ruining as the norm . whats the down side?? thanks in advance

 

Bad idea IMO... I've heard of more than a few blown motors using this system...

 

Paul thanks have heard the same thing , but also thats it's great from people that have had it for a year or so.....am really on the fence here

 

I'm always weary of adding another pump, lines, etc. Just something else you have to rely on. I rather use a map for race fuel and have a switch or run on another fuel altogether, e85, etc.

 

I had it in my S4 and I loved it. I gained around 50whp with it after an EPL retune. The S4 was my daily and it worked flawlessly for ~2 years (when I sold the car for the 996). How "safe" it is really depends on the meth injection system you're using and your tune. The aquamist setups have fail-safes that can cut boost if there is a high pressure (clogged jet), low pressure (leak) or no pressure (out of w/m) situation. I had a labonte kit in the S4 (same as snow performance) without any fail-safes. So I had Tony tune the car fairly conservatively. That way if something did happen to the meth system I wouldn't grenade the engine.

I had the extra and pump in my trunk and ran the meth lines under the car, next to the brake lines, up to the engine bay. Very clean install and hardly noticeable. I ran 50/50 water meth (slightly more meth than what's in winter mix windshield washer fluid), so no real concern about it catching fire or anything.

So if you want safe, get an aquamist w/m kit with a conservative tune and a 50/50 mix and you wont have any problems. You'll get added cooling (the car will always run like it's cool out) and a bit higher octane.

I'll definitely be adding meth to the Turbo when (if?) I ever get used to its current power.

 

Just make sure you get quality line. Snow-performance used that cheap red colored plastic line, I replaced it all with hard line when I ran mine back in the rx-7. I also ran one in the M3, but I bought it that way. But, I personally wouldn't do it on the 996. As I just mentioned above.

However, the fail safes are nice and strongly suggested.

 

I've been running HSF-6 for almost two years now with no problems at all, Professionally installed, easy to set up & manage, 5 gallon ($42.50) mixed 50/50 with distilled water goes long way, I track mine very often and the idea of cooler engine temps (Florida) and higher octane all controlled by system that adds more spray as you get on it hard seems safe to me? I did run out at the track once, I just took it easy on the hard accelerations and worked on corner speeds in & out, everything was fine....

 

You will not gain hp with water/meth, the goal of the water/meth is to compensate for a bad quality fuel and being able to run more boost or a more aggresive timing map. Water and meth by itself isn't going to give you anything (or barely) if you don't get a flash or have the turbos that can support that kind of power. It is a patch for someone wanting to run higher boost on the street without having to rely on race fuel.

One thing you have to keep in mind is that even a big tank can empty out pretty quick if you use your car on the track for example. I have a friend who can't do a weekend at the track on his tank without refilling it at the end. On that kind of horsepower, you also need to find some quality meth, not just put winshield washer in like some cheap tuner do. So make sure you don't run out of it and don't keep a can for too long or it will rust inside and ruin your meth since it is highly corrosive (ask i know...)

It is a cheap method to achieve more horsepower in a relatively safe way on pump gas.

Now for the downsides, like dhahlen said, you rely on some more plumbing to keep it safe, i beleive some systems have things in them to cut the boost if the tank gets low or if you have a problem with the system but i am not sure.

Also, the problem with water/meth is that it is a liquid and the intake manifold on our cars were made for air so the velocity of the fluid isn't the same as the air. What this mean is that the runner were made in a way that all cylinders get the same amount of air, which is not going to be true with the liquid. So, let say cylinder 1 get x amount of liquid, and cylinder 3 gets y amount, at the end of the exhaust, in the O2 sensor, you will get Z A/F ratio. How are you going to tune this to be safe? Make the one with less water/meth richer? How will you know which one gets the less?

For a water meth injection system to be really efficient, you need to be able to tune each cylinder individually, which you can't on our cars because you get one O2 sensor for 3 cylinders. Also, the timing you add to use the potential of the liquid isn't going to be the same on each cylinder. Can we do different timing maps for each cylinder? I don't think so. So when people talk about blown motor, usually it is because one or more of the cylinder were not getting the same amount of mixture as the other cylinders.

So water/meth is an extremely easy system to install and make it work but it is almost impossible to tune it right. Some people just install it as a patch to running race gas and think it's going to be just as safe, it won't. Also, some system just comes on at x amount of boost, the problem is that let say it comes on at 15 PSI, you will get the same amount injected at 15 PSI at 3000 rpm than at 20 PSI at 6000 RPM. Try to tune that... Some system are completly tunable with boost and rpm (exactly like an injection map). Now imagine the headache to tune that map at the same time as the fuel injection map with the timing between that.

by the way, my friend has a burnt exhaust valve on his engine with water/meth running 1,4 bar on 91 pump on alpha28rs

 

well i always run 100oct gas except when I'm stuck i the sticks and can't find 100 oct. every year we tour to Mendocino from sac. and i have to use 91 for the trip home, so i have to use my street file and drive the coast hwy. grandma style (not fun) just thought this would help. if icould just find 100 oct on hhwy 1 between petroleum and fort bragg i'd be a happy camper....