Water Meth VS W2A Intercooling

**Wildsupra** · 26-04-2007, 08:49 PM

My basic question is will running water meth injection on a supercharged V8 eliminate the NEED to run an intercooler setup? Bare in mind it would be a water to air intercooler setup at the most. An AIR 2 AIR intercooler setup is out of the question in this particular scenario.
I'd assume keeping the water 2 air setup cool enough to be efficient would be quickly lost after a few hard runs on short roads or drag strip due to heat soak etc??

Cheers
Matty

**Billzilla** · 26-04-2007, 08:58 PM

You'd never be able to carry enough water or water/meth around to keep the inlet temps cool. You'd have to run a water-to-air cooler somewhere and have a small radiator fitted.
But water/meth is great for increasing power, use it as well.

**Wildsupra** · 26-04-2007, 11:13 PM

Cheers mate, thats what i was needing to know, the water meth was always a certainty, it was just a case of whether or not it could also replace the W2A completly.

Cheers
Matty

**rob_85** · 27-04-2007, 12:11 AM

for the love of god, what are you planning to do ??

**MWP** · 27-04-2007, 01:38 AM

Originally Posted by Billzilla

You'd never be able to carry enough water or water/meth around to keep the inlet temps cool. You'd have to run a water-to-air cooler somewhere and have a small radiator fitted.
But water/meth is great for increasing power, use it as well.

Dont you only need to keep the inlet temps down during high-boost/rpm situations, which on a daily driver isnt very often?
In that case you only need to inject water during these times, so a lot isnt needed.
Put the water tank in the back, and make it big enough to last a full tank of fuel.

**Wildsupra** · 27-04-2007, 07:59 AM

Originally Posted by MWP

Dont you only need to keep the inlet temps down during high-boost/rpm situations, which on a daily driver isnt very often?
In that case you only need to inject water during these times, so a lot isnt needed.
Put the water tank in the back, and make it big enough to last a full tank of fuel.

what you say is very interesting because i thought exactly the same thing.
The water meth will be set to come on at a certain boost setting, but for the majority of the time i expect to be off boost anyway. Its only when i nail it im gunna need the cool temps.
My only concern was the extra heat caused from running the supercharger all the time, because it will be a fixed drive not magnetic clutch, even though i may not be on boost i would expect my temps to be a bit higher than if the charger wasnt there.

Matty

**thechuckster** · 27-04-2007, 08:09 AM

it's not a long-term solution for a charge-air cooling. It's not just running out of water/meth you have to worry about - it's two injection systems to maintain.

Although the plumbing is made more complex, cooling via W2A or A2A is the way to go.

Carrying water in the boot woudl then require: high-peressure pump, fast acting solenoid, stainless-steel injectors, a return system, etc...

Control systems for both fuel & water/meth would need tuning so the system could safely continue (e.g. failover) if the water/meth runs out (e.g. seperate timing/fuel tables in the ECU for water/meth and no water/meth). You also want an air temp sensor post charger that will cope with this stuff but still be highly responsive to changes in air temps.

**dave368** · 03-05-2007, 07:54 PM

One of the guys running in IPRA (NSW) tried the replacement of his a-a cooler with a water/meth injection setup and the data that he collected soon lead to him putting an A-A back in the system.
The first couple of laps were OK but there was not enough cooling capacity at full noise to be able to combat the heat soak buildup over a sustained period. Air temps would peak at aroun 75-85 degrees at around 17-18psi (restricted by 36mm hole).

Cheers,
Dave