Delica Canada | Mitsubishi Van Club

Since my car has a water cooled turbo I have a bit of an idea why this is good.....now I know that in 1993 they started to bring this into the delica. what benifits will this have over a non water cooled one??? especially regarding diesels , as there is more btu's from diesel than gas, will a water cooled one last longer on a diesel, and will it perform better???? When I get my delica (not sure which one yet) I will be tinkering, ie: possibly 3" exaust, intercooler, free flow filter, cold air ram. ( I'll figure that one out later) etc...etc.... As any LESS air restriction in and out helps the efficency of a internal combustion eingne because HEAT is it's worst enemy. So by putting COLDER air with little restriction sould increase the out put of the motor by, I believe it's 2-5 %more hp for every degree F. drop. also this more air in means more oxygen to help burn more of the diesel, thus moving the mass with greater efficency. i know with my car (mazda 323 turbo) that with all the things that i've done to it not only can it keep up with corvetts, but it does this by using way less gas. I've noticed a HUGE increase in gas mileage alone by bigger intercooler, larger ceramic coated intake piping, cold air intake I was hoping that I will get a few more hp out of the little diesel while increasing the mileage. so this will also be one of the (many) things that i will look for when before ibuy one...hope somebody has a bit of imput.....Cheers...R

Watercooling the turbo will not cool the charge air, only the turbo bearings seals and engine compartment... but not much on the later.
Watercooled turbos are much lower fire risk than oil cooled/non cooled ones and stock delicas run and the turbos tend to last longer.
Preformance differences will be non existant to negligible if the turbo s have the same flow/pressure/mass ect..

oceaneer77

this is why I want to put an intercooler on it as well....i use synthentic oil in my turbo'd car and this seems to help lower eingne temp whilst making every thing else slipprier willsynthetic oil help not only the eingne, but turbo as well....

3" exhaust won't be any different than a 2-2.5" exh.

Exhaust manifold output is 2"

Biggest exhaust I've seen on Delica/Pajero's are 2.5" inchers

jfarsang wrote:3" exhaust won't be any different than a 2-2.5" exh.

Exhaust manifold output is 2"

Biggest exhaust I've seen on Delica/Pajero's are 2.5" inchers

True, the exhaust outlet on the engine is only so big, so other than looks, I don't understand why a bigger pipe down the line would make much of a difference.

I understand that the size of the exhaust pipe on a diesel doesn't make much of a difference because it doesn't need back-pressure the same way a gasoline engine does. Any comments on this issue?

I would be changing it right at the turbo with a proper flange, and I figured since big trucks seem to do good with those HUGE 4-6 inch exausts I figured I 'd steal their knowledge going bigger so either 2.5 - 3 " because the delica is only 2.5 L so the volume of the exaust needs to be larger as the exaust gasses from a diesel expands more than gas and the displacement of the eingne so for the total length of the exaust pipe 2.5-3" pipe will work best evacuating the gasses faster and lowering the exaust gas temps thus keeping thermal stress to a minimum on the eingne and turbo....

You can go as big as you want.

Anything above 2.5" won't do anything.

An intercooler and propane injection would do much more.

Water-cooled or oil-cooled makes almost no difference in a diesel. Diesels typically run at much lower temperatures than gas engines and so water-cooling is not needed at all.

We sell aftermarket turbos from the Australian supplier Denco. Most of their turbos are not water-cooled (though you can get them if you wish - at extra cost of course. In long conversations with the tech staff, it has been stated (many times) that there is no advantage to water cooling a diesel turbo and that many of the non water-cooled units last longer and perform better than their water-cooled brethren (and can have higher output - up to 25 PSI for a Land Cruiser [not recommended]).

The only consideration would be that with very hard runs at high output you should allow the turbo a cooling off period - slower driving for a few minutes, or allowing the car to idle from one to five minutes before shut down. The same would apply to a water-cooled unit. One of the larger concerns for turbo life is oil & filtration quality, another would be air filtration quality.

I have never heard any issues concerning fire and water-cooled vs. oil cooled turbos. The whole exhaust system will get very hot under load - upwards of 1200F near the turbo outlet, and that is more of a concern (albeit minor).

If you want more output, you can turn up your boost a little. If you want much more output, then a larger exhaust will add performance gains due to lower exhaust temperatures due to the better flow characteristics. A larger exhaust will also allow for somewhat quicker spool-up.

Even better performance ca be had by installing an inter-cooler. A water to air unit would probably work well in a Delica, but would be a very tight and challenging fit. I don't think an air to air unit would be practical.

If anyone has piles of money to play with, we'd be happy to configure an installation for you.

~John
E4 Auto Repair Ltd.
Radd Cruisers 4WD
Duncan, BC

Thanks John...I have an air to air in my car with ceramic coating on all intake bits, all this works good.....so I plan on trying this on my delica (when I get it) because if you can get more 02 to mix with the fuel then this means MORE of the fuel in the cylinder is being burnt thus less (ish) emissions (raw fuel) being spewed into the atmosphere...