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to Water/meth or not to water/meth?

6K views 23 replies 9 participants last post by  Pecoro4 
#1 ·
Hi guys,

I have been pondering the idea of install water/meth on my car. Looking for a bit more power and cooler intake temps... What are your $0.02?

setup is as follows;

KW Kit with DW65c
Skunk2 TB
Custom 3" intake
Skunk2 Megapower Header
Full-Race Cat-back.

I made 380whp/240wtq.

I would install the AEM W/M kit.

To do or not to do?

Cheers :vtec:
 
#4 ·
Nice, good to know. Same here, 94oct is the best I can get and even then it can contain up to 10% of ethanol.

Meth/ water injection is the best thing you can do to a f/i car, however if you tune for power make sure it is on the rich side. Just in case the pump/ selenoid fail. Id say do it, especially if you live in a warm climate.
Yeah, I dont think there is a losing side to doing this! I'll get on it and get it re-tuned!
 
#5 ·
Get Vit to build in the failsafe when you have it tuned. It watches your IAT and if it gets too high (say over 130 F) which probably means you lost your W/M flow, then he has the tune dump a bunch of fuel and backs off the timing to keep you safer. Some kind of indicator telling you the system is flowing is a good idea, and an AFR gauge is good too - if you are running lean while boosting, something is up and you can check into it.

With the power you are working with, I'm guessing Vit will want you to find a ridiculously huge nozzle flow rate...I'm at 15 gal/hr on my little M62! So you may need multiple nozzles, or get one custom machined.

W/M probably provides better cooling and power than aftercooler, but it does need to be watched more carefully. Think of it as the "turbo" of cooling :giggle:
 
#12 ·
I picked up an 07 civic sedan si last year im looking to boost in the future, However I do have a 95 del sol ive been working on with a h22 supercharged that I just put the AIS water meth kit on, I should be tuning it here soon, Ive been very interested in the k guys setups with watermeth, I was hitting like 170 deg iats without water meth and stopped making power at 200whp. The h22 is 11.5:1 com with 9psi jrsc on it and id1000s on e85
 
#13 ·
I never get IATs above 100 deg F even on road racing track days when I'm beating the crap out of my motor during 25 minutes sessions. Requires a LOT of W/M mix though...

The key seems to be finding the right nozzle size to prevent temps from climbing during boost.

Start with your biggest nozzle (most LHP or GPH), record your IATs (not sure what kind of datalogging you have with your h22) and see if they climb or drop during a WOT pull. Don't worry about spraying too much W/M mix - you basically can't, and the worst that happens is the motor bogs down, but no damage at all is done. So start big!

You may find that you will need multiple nozzles to provide enough flow - add a T and keep going. But with e85 maybe you won't need as much - I don't have any experience with that fuel!

200+ WHP on a little del sol is awesome, that must be a blast to whip around in.
 
#20 ·
yeah its pretty fun, the e85 doesnt seem to do much with my iats becuase the sensor is upstream of the injectors and the hondata s300 pulls timing and fuel at 170deg iats, I have the dual nozzle setup and Rodney hooked me up with a few different nozzles to try, My goal is 350whp with my del sol it was barley starting to get going, I could change the settings in the ignition compensation and fuel comp parapmeters in the s300 to allow me to keep running at the higher temps but I figured id play it safer, Im hoping to see a big difference when I go back to tune again, I have the s300 which is pretty much the same as the flashpro, I will definately be playing around with it more this summer!
 
#17 ·
$350 for a decent kit, maybe a bit more for extra nozzles or bigger tanks but doesn't sound like you would need more fluid capacity. You have a cooler already? Venom or aftercooler? Install on this is pretty simple - a few electrical connections is the hardest part, but if you've done any of the other work on your setup then this will be easy.
 
#19 ·
All the big names have some good components, so no particular recommendation. No install guides that I'm aware of but I bet the instructions with any of the kits would be fine.

If at all possible with your intake, point the nozze so it sprays right into the throttle body (like on the elbow). Seems to work better here than farther away from the TB.
 
#22 ·
Assuming you are running lean at WOT but not partial throttle, you can look at a few things that I can think of on a w/m system:

1. Leaks - this happened to me recently with a loose hose fitting. Less w/m will make you run lean.
2. Blocked nozzle - gotta keep you fluid/tank very clean, but there should be a little strainer ahead of the nozzles to help prevent this. Could still happen. Pull the nozzle and inspect.
3. Pump or solenoid failure - run test leads directly from your battery to the pump (just a touch to see that it turns over), same with the solenoid (should click over).
4. Overall system failure - there are a few ways to check this, but the easiest way might be to just pull the nozzle from the intake (still connected to the tubing from your pump though), stick it into a clean water bottle of known volume, and figure out a way to trick the system into running as if you're at WOT. Wear eye protection and latex gloves for this - w/m mix is not water, and you don't want a facefull! This will depend on the type of system you have, but mine is on a boost pressure switch which is easy to jumper across. Then time how long it takes to fill the water bottle to get the actual pumping rate. If nothing happens at all (and you're sure it should be working) then your controller may be the problem, or it could be as easy as a blown fuse someplace (like on the pump) or loose connection.

If everything is working perfectly on the w/m system, then you're into the rest of your fueling system (fuel pump, injectors, correct gas, blah blah blah).

Can't say what the best kit is - I haven't tried any of them so I'd be talking out my ass -but seems like from what I've read that AIS, Snow Performance, Devil's Own and AEM all make decent kits and you would do fine with any of them. They really aren't that complicated, which is why I made my own.
 
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