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My Methanol/water injection project
by
AudiVWguy
on 10 Nov, 2008 16:41
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I installed this injection system on my Caddy a while back and I thought I would share it with you. I started looking at the junk yard for the most powerful windshield washer pump I could find. What I found was the old Toyota Cressida pump puts out over 40psi. Nothing else came close. Next I found a washer fluid container that would fit next to my existing one. I can't remember if it was Subaru or Mitsubishi, but it had an extra molded hole for two of the cressida pumps and it sat low enough so I wouldn't need a stop solenoid so the vacuum wouldn't be sucked in at speed. Next I ordered 40psi spray nozzles from McMaster Carr. I'm currently using the 3.19 GPH nozzle and I will order the next 2 sizes up.
Using a G60 manifold the perfect place was to use the fitting that goes between the throttle body and the intake hose. On the bottom I welded a plate to mount the nozzel.
This setup sprays perfectly into the intake manifold. The 50/50 mix of methanol and distilled water cools the intake air even more and provides a catalyst for a more complete burn of the fuel.(According to the companys suppling systems for the Dodges and Fords) My EGT's at full throttle have dropped a little over 100 degrees at full throttle. I think a little larger nozzle and I will have it dialed in. My butt dyno can feel a difference! :twisted:
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#1
by
AudiVWguy
on 10 Nov, 2008 16:42
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#2
by
zukgod1
on 10 Nov, 2008 17:05
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Hey that's pretty cool. Do you have it ran through a Hobbs switch to come on at a certain boost pressure?
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#3
by
AudiVWguy
on 10 Nov, 2008 17:14
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Yes I did, forgot to mention it. Set at 5psi for now.
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#4
by
dillenger1
on 10 Nov, 2008 18:48
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what size is that spraying in the picture?(nozzle)Nice setup.Im collecting parts for the same.Ive got a mk1 cabrio bottle and pump that seems to work well.the cabbys bottle is tiny probably half the size of mk2s.I think i need a bigger pump though,maybe not.The vw pumps last forever when used properly for the windshield.What year creseda?
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#5
by
AudiVWguy
on 10 Nov, 2008 19:13
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The nozzle is 3.19 GPH (gal per hour) I think I gonna order 2-3 sizes larger till the engine bogs and then backoff. I don't know what year Creseda, but I couldn't find a matching part number from other Toyota models. I would buy some nozzles first and see how they spray. Maybe there are a lot of choices that will spray fine.
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#6
by
Smokey Eddy
on 10 Nov, 2008 21:04
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whoa crazy! that won't break rods?
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#7
by
jtanguay
on 11 Nov, 2008 02:09
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with my experimentation with mine, it increases the idle when sprayed in... yes i've sprayed it at idle, although i probably shouldn't :shock:
but only one short spray... its really neat how the idle boosts by about 300-500 rpm and i can also hear a bit more clatter... probably because water can't be compressed :lol:
i wouldn't doubt that water injection could break rods... but you would need a LOT of flow if you were running more than 10 psi boost.
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#8
by
AudiVWguy
on 11 Nov, 2008 05:57
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Some systems have multiple injectors because at 1500rpm it might be a little too much, whereas at 3500rpm it isn't enough. I'm going to keep it simple to do its job at full throttle passing responses.
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#9
by
Smokey Eddy
on 02 Dec, 2008 10:49
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Is no one worried about trying to compress water here? You guys are nuts
Too much water = some intense hydro locking would it not?
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#10
by
Op-Ivy
on 02 Dec, 2008 11:03
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Is no one worried about trying to compress water here? You guys are nuts
Too much water = some intense hydro locking would it not?
I was just thinking the same thing. Why water/methanol? Do you have to run the two together?
Nice build by the way!
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#11
by
AudiVWguy
on 02 Dec, 2008 11:40
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I talked to some of the manufactures of existing systems and they said the engine will start to bog when there's too much liquid. To be safe start with a choice of nozzles and have them come on at a higher boost level (10-12psi) after you have chose a nozzle, start lowering the pressure switch to see the lowest psi without bog. The lower the engine rpm, the more liquid is going in the cylinder. Or you could think of it in terms of air velocity going past the nozzle.
They were saying the reason for the mix is because the methanol becomes a catalyst to increase the fuel burn efficiency.
-JB
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#12
by
dillenger1
on 02 Dec, 2008 15:14
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The compression is so hot that it will vaporize immediately in the cylinder(creating steam and pressure as it switches to gas)It also cleans the chamber.Have you ever cleaned a cut with alcohol?It gets quite cold,right?The meth cools the charge way down.Therefore giving us more power!!In a gasser the methanol is used to increase octane to decrease detonation and keep time, in a diesel its just for cooling.
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#13
by
blackdogvan
on 05 Dec, 2008 14:53
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I've been thinking about this setup for myself for a while, van has perfect meth tank for rear washer. Just for climbing the Malahat... One thing I was thinking tho, if you're running a 40 psi pump, the differential pressure under boost may not atomize your spray very well, especially if your in the 20+psi boost range. Lots of meth systems seem to favor 100+psi pumps.
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#14
by
zukgod1
on 05 Dec, 2008 15:01
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Just need to find a good place to get the pumps without having to sell a kidney in the process.
