Water-methanol injection for turbodiesels

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Model you own: w123
Location: Sydney

Water-methanol injection for turbodiesels

Post by 3DB » Mon 27 Jun, 2016 7:49 am

As some of you know, I bought ‘Anth’s Coal Grenade’ a few months back. I drove down to Melbourne with a friend, filled the tank with biodiesel that we brought along and drove it back to Sydney. Since then I’ve been working on it as necessary to get NSW roadworthy and it is now registered. The big selling point for me was the custom turbo that Anth fitted, which makes an otherwise very slow vehicle able to participate in normal traffic. Anth had also fitted a water-methanol injection system to further increase power and keep EGT’s under control. This system did not come with the car, but, fortuitously, I had already bought one that I was planning to install on my Rodeo ute, so that sealed the deal.

Anth was kind enough to leave all the pipework and wiring from his old one in place and the new one bolted basically straight up.

Here's a link to the one I had already purchased…fortunately when the AUD was nice and high:

http://www.coolingmist.com/pagedisplay. ... turbo_kits

Here's the installation manual:

‪http://www.coolingmist.com/coolingmist ... deluxe.pdf

If I had my time over, I think the following one is even better value as it is the older version and is basically the same, just old stock and with a check valve in place of the solenoid, which I haven't installed (yet) anyway.

http://www.ebay.com.au/itm/161709434334 ... EBIDX%3AIT

I think you would struggle to buy all of the parts for the cost of this and I am very tempted to put a second one in my Rodeo the results are so positive.

So I feel like I've got it dialed in now. The boost pressure switch comes set at 10 PSI from the factory, but is adjustable from 1 - 25 PSI. I feel 10 PSI was a bit too late for this particular turbo as the engine is already screaming by the time it makes 10 PSI. I've adjusted it down to about 4 and it makes an amazing difference to driving around town. You can really feel it kick in and the boost pressure climbs much more rapidly than without it. The result is more low-end torque and you don't have to rev it as hard to extract the power. It is effortless driving around town and actually pulls up hills, whereas without it, you can just maintain speed up hills (which I guess is an improvement over a NA 300D anyway). If I do any highway driving I think I will adjust it up to about 6 PSI as it would be on all the time at 100 km/h and I will end up draining the 5 litre tank too quickly. At 6 I think it would just come on when overtaking or on the hills.

I opted for the smallest option of ‘up to 300 horsepower’ with the smallest nozzle. I believe Anth had one several sizes larger and had the boost switch set much higher, which would have produced a lot more power much higher up in the rev range to the point where the turbo was making up to 21 PSI from memory. In the interest of engine preservation and not going through the 50/50 mix of water/methanol too quickly, I will stick with the small nozzle for the time being. I don’t think I have hit more than 12 – 14 PSI before I chicken out and shift gear.

Around town, I think I will get at least 100 km, maybe 150 – 200 km, to a 5L tank of ‘boost juice’ under the current settings, depending on how I drive it. I may also try just straight water when this tank runs out to see how much difference that makes.
1976 W123 300D (weekend warrior on biodiesel)
1995 Holden Rodeo 2.8 factory turbo diesel ute (daily driver...also on biodiesel)
(@thirddegreeburns on Instagram)

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Tony From West Oz
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Joined: Mon 20 Jun, 2005 9:04 pm
Model you own: I own multiple different models
Region: Victoria
Location: Bedfordale WA

Re: Water-methanol injection for turbodiesels

Post by Tony From West Oz » Wed 04 Jan, 2017 6:54 pm

The topic had changed, so I have moved a number of posts from this thread and given them their own thread viewtopic.php?f=30&t=23493
Life is a journey, with problems to solve, lessons to learn, but most of all, experiences to enjoy.

'83 W123 300D 325000km (Wife's car Josephine - sold).
'84 W123 300D replaced good OM617 912 with OM617 952 and enjoyed having good acceleration for the first time since first driving a 300D in 2002 - became engine and trans donor for 300CD Turbodiesel conversion. Now parted out.
'86 W124 300D sold (Wife's old car - sold )
'85 W123 300CD, 275 000km (Fatmobile) rebuilt turbodiesel transplanted into 280CE (SOLD)
'99 W202 C250 Turbodiesel (my darling Wife's car - Sold)
'98 W202 C250 Turbodiesel (my car - Sold)
'06 Ssanyong Musso Crew Cab 2WD Ute (OM662 diesel and Auto Transmission)
'00 Ford Courier Crew Cab 2.5TD

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