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water/meth injection 

 

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 Post subject: water/meth injection
Posted: Sun Dec 02, 2007 4:57 pm 
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has anybody had any experience in water/meth injection systems? i am looking at the type that come on on WOT, or a programmed particular throttle setting. seems like it could be a reasonably simple and safe mod to do.

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Posted: Sun Dec 02, 2007 5:44 pm 
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They are used to help with pinging, carbon biuld up, and to help keep the temp down.

 

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Posted: Sun Dec 02, 2007 8:45 pm 
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we've used it on an 18RG that was changed from a high comp N/A setup to a still high comp turbo setup running an SU carby.

it set up with a hobs switch to come on at 2psi. they key to it was very high pump pressure and a nozzle they has good spray patern. other wise you end with some cylinders getting little to no water/meth and some getting to much.

your biggest problem will be buying the meth. it aint cheap

 

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Posted: Sun Dec 02, 2007 10:07 pm 
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tickford_6 wrote:
your biggest problem will be buying the meth. it aint cheap



Yeah, don't get the backyard stuff......................lol........meth.......lol

 

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Posted: Mon Dec 03, 2007 8:53 am 
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I read the title and first thought was, "Is someone really asking about ICE"

Now Ive read Im interested, how does it work?

 

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Posted: Tue Dec 04, 2007 8:18 pm 
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Basically the water/meth mix cools the intake charge and allows a harder tune or a higher compression ratio with a lower risk of detonation. Getting the nozzle size, pressure and flow rates perfect would be very hard I would think.

Has anyone used any kits?

Which ones are any good?

$$$?

 

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Posted: Tue Dec 04, 2007 10:58 pm 
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CAPA do a kit. i've got one for my EF, yet to install it but - I bought an intercooler instead.

 

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Posted: Tue Dec 04, 2007 11:15 pm 
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Doesn't the CAPA kit use a windscreen washer pump?
I've grabbed a simple kit from the states off Ebay, uses a Shurflo brand diaphragm pump (150psi? from memory), a solenoid as a lockoff (instead of checkvalve), and a flushmount nozzle.
The plan is to PWM the solenoid with an output from a V500, off a map based on air intake temp and boost.
I wanted something that wasn't going to guzzle water, but also hopefully be effective because I won't be running an intercooler.

From what I've read on the interwebs, the key is high pressure and good nozzle design, as tickford_6 has mentioned.
The theory is you'll get better atomisation of the water/meth, and due to more surface area it will cool the intake charge better.

 

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Posted: Wed Dec 05, 2007 10:05 pm 
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i'm pretty sure when the 18RG was first set up, it was runing water only.
and no mater what was done no amount of water or tricks to try and get a better distrobution in the intake charge it didn't help. 10:1 and boost doesn't go well.

with a switch to 50/50 water/meth detonation was gone and the focus shifted to making nozzles smaller and smaller to find the least amount mixture possible and still stop detonation.

 

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Posted: Thu Dec 06, 2007 6:34 am 
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Methanol isnt that dear, 80c a litre, but to run straight methanol, you are looking at twice the comsumption than petrol. Unfortunately it only comes in 200l drums
Brett

 

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Posted: Thu Dec 06, 2007 8:35 pm 
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TerroristGHIA wrote:
Methanol isnt that dear, 80c a litre, but to run straight methanol, you are looking at twice the comsumption than petrol. Unfortunately it only comes in 200l drums
Brett



we buy it in 20L drums all the time

 

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