Outer Limits 4x4 Board

Hi im looking at fitting a turbo to my 1hz. And as the sbject says do i need a water cooled turbo? looking at the different systems some say you do and some say you dont.

Be good to hear your thoughts cheers guys

They are better with water, no 2 ways about it, in most modern water cooled turbos the oil is restricted as its there just for lubrication, most of the cooling is done by water.

Instead of getting opinions from people who probably only recommend what they have or have heard call a shop specializing in turbo rebuilding and get them to set you straight, take you 2 mins and 25c and you have a real answer not a guess.

NutterGQ wrote:They are better with water, no 2 ways about it, in most modern water cooled turbos the oil is restricted as its there just for lubrication, most of the cooling is done by water.

Instead of getting opinions from people who probably only recommend what they have or have heard call a shop specializing in turbo rebuilding and get them to set you straight, take you 2 mins and 25c and you have a real answer not a guess.

Well said. The water cooling on a turbo comes into effect when the turbo
is shut down.....helping to retard deposits forming from overheated oils
at the point of shutdown. Water cooling has little or no effect when the
engine is working. It , therefore, helps lenghten turbo life and has no
downside except for the fact that you have extra water lines in place to
look after and maintain.
My choice would be to use water cooling, ....'cause it cant hurt.


Also.......opening the bucket of worms.........the 1HZ likes to crack heads
when (aftermarket) turboed. Intercooling is a BIG bonus.

just to stirr......

deisels don't really need water cooling. they generally don't run hot enough to warrant the extra exspence. they are more important on petrols which have higher exhaust temps.
even on new deisels the turbo's are still coming out without water cooling.

however the one problem that water cooling helps with on deisels is heatsoak into the oil thats still in the turbo when the motor is shut off. this is exspecially for those drivers who do not let the turbo cool down before turning the motor off.

personally.... if it dosn't cost much/any extra, grab the water cooled turbo.

Most of the water jacketed turbos out there are used on both petrol and diesel engines.

The turbos designed solely for diesel use don't have water cooling.

You can run a water jacketed turbo without water running through it if you like, but don't seal the ports up completely or it'll pressurise when it heats.

MUD EMPIRE wrote:

Also.......opening the bucket of worms.........the 1HZ likes to crack heads
when (aftermarket) turboed. Intercooling is a BIG bonus.

dont they crack pistons? i know they dont like allot of boost. but the 80 series 1hz are ment to be a little better then the 100 series for after market turboing.

Also i rang Denco and asked about there systems and they say watercooling is not need but will do it at an extra cost. and AXT say you do need it.... hence why i posted this, as there is conflicting reports.

I'm certainly not one to go by, mine has been a huge issue to me, but the water coming out of my turbo was coming out at over 100 degrees, so while trying to solve an overheating issue, it was definitely considered an option to take the water cooling off the turbo.
However, I suspect my turbo has pooped itself to be doing that to the water, and so far nothing has been done, as she is pretty much just sitting in the yard and awaiting me to find that perfect replacement vehicle. I've long since given up on fixing mine.

the internal gaskets went on my dad 2.8 turbo gu and was leaking water out of the centre of the turbo like there was no tomorrow, so we disconnected the water to it and drive around like that for a while, it did a trip thats about 60klms highway use and alot of driving around town you can smell that its hot but i spose thats why i chucked in the pod filter and hope that that does him for a while, because its $1500 to get it fixed or its $1590 for a new kit,

so in one word for the running of turbos without water, id say not a good idea

The hotter the exhaust side of a turbo runs, the more efficient it runs.

hotter the exhaust side the better it runs....... to a point were internal meldown will happen..... but that normally only happens after about the 800+degrees C area.. for a little while


thats a very general temp though.... thats for the bigger 6 cyclinders

eliteforce32 wrote:hotter the exhaust side the better it runs....... to a point were internal meldown will happen..... but that normally only happens after about the 800+degrees C area.. for a little while


thats a very general temp though.... thats for the bigger 6 cyclinders

If your exhaust temps are that high, it's a guessing game whether your pistons or your turbo will give you the finger first.

thats what im saying very general view.... of course try to run cooler than that, a lot cooler

The water reduces the oil coking the oil return in the turbo which is very small, with hot shut down the oil cooks in the turbo CRHA (the middle) reducing oil return and causing failure of the piston ring seal on the exhaust side. It dosent reduce exhaust housing temperature. Diesel exhaust temps on modern engines can exceed 600 degrees c, this cooks oil. If you have a TD42 and have turned the pump up cause theyre gutless then you will potentially have raised exhaust temps from 350 to 550 degrees hopefullly no more. I wouldn't have anything but having worked for DTS I saw the turbos returning for repair usually failed due to hot shut down oil coking.
Joel