What kind of gains are you seeing? I would imagine if tuned for it you could see decent gains just by adding a few deg of timing.
Not sure how much it would affect your intake air temps, probably depends on where the nozzle would be located.
I only know of two guys who had W/M installed on their RS4’s, both had PES S/C’s as well. Not sure if they ever reported the gains from W/M independently from the S/C gains though.
I’d be interested to see what it does without boost.
If anyone wants help selecting a setup or wants to try it out just hit me up and i can help. I’ve worked with many different meth kits… we will want an injector duty based controller for this application.
Put some ice water in the supply tank for some instant iat relief on a hot track day.
I had a local b5s4 guy ask me the same question RE running w/m on my 3.0… Curious to see if anyone’s done it on the 4.2 as well.
is this to help with IAT’s or look at jacking up the octane rating on the car. Either way you would need to get tuned for it right ?
this would be both for lowering iats and raising octane.
A retune is needed to take full advantage of it.
hmmm thats what I thought.
What sort of octane increase can you see from running a 50/50 mix to 100% meth
you will get more octane out of 100% meth however you will lose the cooling effect of the h2o.
I like 50/50 mix while some guys swear by 100% meth
others swear by 100% water.
It’s important to remember the corrosive properties of meth when considering 100%
I’ll max out the supercharger first 
I talked to Count about this a lot a long time ago (well before s/c time). He basically said I could do it and send some logs and he’d adapt anything if needed, but in the end, said it really wasn’t worth it on the car until boosted past 8psi. I’d still be interested in it and would like it just to keep IAT temps down, but Count talked me out of it.
I know it works well in boosted applications. If CV has done some meth testing with it in N/A applications I’d love to hear more about it.
I just don’t get it. The stock S4 engine can’t handle more than 500 and change chp without entering danger territory. The JHM sc can go way past that once you rebuild the engine with stronger internals. Why add meth unless you’ve hit the max the sc can produce? Am I missing something here?
Snow performance and even race fuel companys will tell you there is little to no gain here with w/m
The impressive nature of w/m is on its ability to remove heat. On a n/a motor the mass of air is less so there is less heat per volume so even if you did use it to remove heat the gains as so much less if any then boosted its pointless. From there on using meth as a octane booster would require so much of it that you would be better off using race fuel
This comes stright from vp fuel and snow performance team at a fund raiser I attended last year
Awesome good info.
Agreed, better to just convert to E85 IMO if you’re looking towards the alternative fuels route. Much better gain potential, of course you have to have some local.
Water/methanol is kind of meh. Keeping it filled gets old.
Yeah, i’m all about some e85… too bad the closest station is over an hour away from me.
e85 + wmi = winning
I had a article published I wrote on this subject a few years back. Ill see If I can send or post a link as they as always ask that you do that when publications use your work.
The short answer is. Its not used because it won’t work like it will on turbo Apps. There is a much larger issue with what its being used for. The jewel release needed to benefit to any extent would require you to run full methanol and a much larger jet then would ever be offered. Running full methanol in W/M kits can and in some cases has resulted in the methanol actually catching on fire in the pump. W/M kits request you go 50/50 in part to keep the Methanol from actually catching on fire in the pump.
If this is enough let me know. Ive helped several people test this and several people who have tested it have shown it looses power And it will loose power Even though I will search to see if the article was published on the web and not just in print.
Its been said already but. there are no gains. The concept sounds good however it isn’t working like that. Ignition timing isn’t an issue on a Naturally aspirated car like it is on the turbo car.
CV really knocked it out of the park with the jewules point. Standard fuel has more power releaase per cup then methonal so you would be loosing power.
Not saying you don’t know but its more about power release of the fuel then its ability to prevent knock. So while Methonal might have a lower tollerence to knock it has less power. Adding timing isn’t going to do antying at that point.
ah, thanks for the brief explanation. I would love to read your article if there is a link on it CV.
Makes sense the way you guys described it.
Joules*
and to mirror previous comments, these motors arent strung out enough to see any benefit. They can hit their ideal timing curve on 93 with a good exhaust set up behind it.
For a good read on water injection, try rbracing-rsr.com/waterinjection.html