water injection instead of FMIC??

Dark-Hawk · Mar 2, 2005

If you're set on going with an FMIC, pick one up from Street Imports. They make some good ones for pretty damn cheap. My buddy is running their second to largest FMIC on his DSM with an FP49 (50 trim) and the IC works great.

nismo2491 · Mar 3, 2005

I still say running WI in place of an I/C is sketchy at best... maybe in addition to it but not in place of...

nissanfanatic · Mar 3, 2005

Ir an 5psi non intercooled for a while. Like the first 1200 miles or so. Then 6psi for a while through a SVT sidemount. I think WI and AI are all band-aids. Just save up and get a real intercooler or go junkyard shopping for a cheapie.

Now are you guys speculating on just any old vacuum line popping off or the wastegate line? Because if the wastegate line comes off, which the only time it really would is in boost, boost is going to spike to 20+ instantly. Your engine is shot if this happens no matter what the build is if it is tuned to run 5-7 psi. Don't believe me? Go outside and get in your car(if its turboed) Warm it up, and get on the road. Get up to speed. Now go to about 3500rpm and don't make any boost. Then go WOT instantly. You'll see that at that RPM, there is no lag. Its damn near instant.

14.5 drift · Mar 3, 2005

Why is water injection a band aid?

I see it as a very useful tool for knock suppression. When the boost goes up, the water turns on, the timing goes up, every one is happy.

Oh yeah, when water runs out, put more water in, lol. One gallon of water can last as long as 5-8 tanks of gas.

nismo2491 · Mar 3, 2005

I'm not saying its a band aid I just don't think it should be ran in place of an intercooler.

14.5 drift · Mar 3, 2005

alright, why is it sketchy at best?

nismo2491 · Mar 3, 2005

because WI is a touchy area. if done wrong it can be disastrous. its too easy for the pressure to drop or something like that while you are in the middle of a run and cost you a motor. now with an intercooler the only thing you have to worry about is a boost leak which will cause you to run rich, not lean.

Mavrick · Mar 4, 2005

14.5 drift said:
Water injection is the shit. Makes 91 octane work like 100 octane. Ive seen guys run 31 psi on 91 octane with water injection where as without it, they could only run 22psi. Great investment.

Since you are only going to be at WOT a few times a gas tank the water injection reservoir can stay full for weeks! If you have a 15 gallon tank, and you run the whole 15 gallons at WOT you would only need 3 gallons of distilled water. It's a great deal and woerks for any setup, drag, road race, auto cross, drift.............

The only way 31 PSI was possible in that car was with an intercooler in conjunction with water injection, no way could any motor withstand 31 PSI without an intercooler.

14.5 drift · Mar 4, 2005

nismo2491 said:
because WI is a touchy area. if done wrong it can be disastrous. its too easy for the pressure to drop or something like that while you are in the middle of a run and cost you a motor. now with an intercooler the only thing you have to worry about is a boost leak which will cause you to run rich, not lean.

you don't know what your talking about man. Every thing is controlled via a sensor plummed into your intake track tuned to activate at your desired boost level. There is also a servo taking commands from the same signal with operates pulse durations of your fuel injectors so that a precise mixture of fuel and water is entering the cylender at all times. The more fuel the injector adds, the more water gets mixed, ussually a 1:10 or a 1:9.5 ratio of water to fuel is most desirable.

Different size nozles will negate wich ratio of water to fuel is supplied.

Next!

14.5 drift · Mar 4, 2005

Mavrick said:
The only way 31 PSI was possible in that car was with an intercooler in conjunction with water injection, no way could any motor withstand 31 PSI without an intercooler.

I never once insinuated this was done without the help of an intercooler, don't put words in my mouth.

nismo2491 · Mar 4, 2005

14.5 drift said:
you don't know what your talking about man. Every thing is controlled via a sensor plummed into your intake track tuned to activate at your desired boost level. There is also a servo taking commands from the same signal with operates pulse durations of your fuel injectors so that a precise mixture of fuel and water is entering the cylender at all times. The more fuel the injector adds, the more water gets mixed, ussually a 1:10 or a 1:9.5 ratio of water to fuel is most desirable.

Different size nozles will negate wich ratio of water to fuel is supplied.

Next!

what kit is this you're talking about? maybe the kits I've seen have all just been homebuilt pieced togethor ones....

14.5 drift · Mar 4, 2005

auquamist.com has alot of different kits ranging from your home built water pump and a nozzle to the kit i just described. Haven't heard any complaints about there kit yet.

nismo2491 · Mar 5, 2005

how many guys have you heard of though that run WI in place of an i/c and not to supplement one?

14.5 drift · Mar 5, 2005

What do you mean? I don't know any one running less than 14 lbs (stock wastegate on an eclipse) so they all have intercoolers. I think there is a few that run 6-8 lbs without an intercooler or water injection at all, for instance everyone with a greddy kit, and alot of guys running superchargers on there camaro's and firebirds.

nismo2491 · Mar 5, 2005

the whole argument of this thread was running WI in place of an i/c and I said its a sketchy idea at best. I wasn't knocking water injection as a whole, just saying that it was best used to supplement an intercooler.

boostinsidewayz · Mar 5, 2005

nismo and drift~~ thanks for the help.
this thread was dead in the middle of january, then you guys threw in a bunch more insight and info.

nismo2491 · Mar 6, 2005

boostinsidewayz said:
nismo and drift~~ thanks for the help.
this thread was dead in the middle of january, then you guys threw in a bunch more insight and info.

is that supposed to be sarcastic or something?

nissanfanatic · Mar 6, 2005

Water injection is very similar to a band aid. Your intercooler isn't efficient enough for the boost you're pusing and a new one is too expensive. WI is cheaper and easier right? Cheaper and easier rule out the third choice, optimal. No street car is pushing too much boost for the intercoolers avaliable today. And if it is, then its one hell of a street car.

And why do WI instead of doing alky?

SOHCturbo · Mar 6, 2005

How is it "sketchy at best"?

You can run kits without water injection or intercoolers safely depending on boost levels. So if you ran 5psi without either methods of cooling, you should be able to add water injection to up your boost.

WI kits have built in safeguards, if it stops working, you abort your run and fix it.

14.5 drift · Mar 6, 2005

SOHCturbo said:
How is it "sketchy at best"?

You can run kits without water injection or intercoolers safely depending on boost levels. So if you ran 5psi without either methods of cooling, you should be able to add water injection to up your boost.

WI kits have built in safeguards, if it stops working, you abort your run and fix it.

5 lbs of boost? Lol, thats what the M3 guys are doing with there 11.5:1 motors.

water injection instead of FMIC??

Dark-Hawk

nismo2491

nissanfanatic

14.5 drift

nismo2491

14.5 drift

nismo2491

Mavrick

14.5 drift

14.5 drift

nismo2491

14.5 drift

nismo2491

14.5 drift

nismo2491

boostinsidewayz

nismo2491

nissanfanatic

SOHCturbo

14.5 drift

Top Contributors this Month

Recommended Communities