Outer Limits 4x4 Board

hey guy's just wondering on turbo choice for my diy turbo install on my gq td 42 , got a t3/4 oil cooled only turbo was gunna get a high mount manifold plum it up via oil feed line off the block and return via rear of the alt drain. my main Q's is about the oil only cooled turbo would this create to much of a heat issue or would it be very minimal compared to oil and water cooled if any one can help would be much appreciated

I had an oil only highmount with no issues

yeah didn't think there would be that much of an issue...... just a mechanic mate said about doin some stuff like driving on the beach at hi tide and your in the soft stuff workin it hard on boost for for extended period of time that was the only thing that wanted to know or was really concerned about cheers for that

pro253 wrote:yeah didn't think there would be that much of an issue...... just a mechanic mate said about doin some stuff like driving on the beach at hi tide and your in the soft stuff workin it hard on boost for for extended period of time that was the only thing that wanted to know or was really concerned about cheers for that

That doesn't really have anything to do with how your turbo is lubricated or cooled. You'll probably find you'll cook your motor from high EGT's from loading it up before you "cook" your turbo.

The advantages of a turbo that is water cooled is that the cool-down period is not as important as an oil only cooled/lubed turbo. An oil only turbo will need more attention paid to it in regards to cooling down before engine shut-off, as a hot core with static oil will eventually coke up and require a rebuild sooner.

So in short, no - it won't cause any problems provided you look after it properly. And as an extra tip from me, i'd install a pyro probe pre-turbo while your putting your DIY kit together.

thanx for that coxy that was basically wondering on a whole if it will cause any issues heating overall engine wise and turbo that was the basic question prob didn't explain my self properly in the last post just wondering about what you said running a pyro pre turbo....... where generly would run it around where the turbo bolts to the manifold ?? and would it pay to run another post turbo ?? thanx again just tryin to do it right with out costin me a fortune now and also inthe long run lol

Water cooled turbos are not necessary for diesel engines. Petrol engines run much higher egt's than is safe with a diesel (diesel engines have higher compression ratios and combustion pressures), and they (petrol engine) do need water cooled turbos.

If you have turned the fuel up, then you should have a gauge installed with the thermocouple installed pre-turbo so you know the egt is acceptable. Then you can idle down for long enough so the egt is less than say 190*C before you shut the engine down.

If the fuel hasn't been turned up then the egt won't be high and you only need to let the engine idle down for a short while before shutting down.

Edit: thermocouple should be pre-turbo. No need for one after the turbo then.

If the pump has had the fuel increased then working the engine under heavy load for sustained periods could create dangerously high egt that you would be unaware of without a gauge to monitor the temp.

Edit 2: specifying T3/4 turbo is not particularly informative as that can cover a great many variations in turbine and compressor. If it has a restrictive turbine for example, the drive pressure will be higher than a more open turbine and the safe allowable egt will be less as a result.

pro253 wrote:thanx for that coxy that was basically wondering on a whole if it will cause any issues heating overall engine wise and turbo that was the basic question prob didn't explain my self properly in the last post just wondering about what you said running a pyro pre turbo....... where generly would run it around where the turbo bolts to the manifold ?? and would it pay to run another post turbo ?? thanx again just tryin to do it right with out costin me a fortune now and also inthe long run lol

I've got a lowmount turbo - you can see my probe mounted directly opposite the manifold flange in this pic:



I've also done one on a stock GU TD42T mounted in a similar place, pretty much right in the middle of the flat surface under the heat sheild:



The best bit about mounting it before the manifold goes on is that you can avoid drilling into internal webbings in the manifold, and you can safely drill/tap without worrying about dropping swarfe into the turbine.

You'll also find that most "later" diesel turbo's are water cooled (roughly from late 90's on), and petrol turbo's were water cooled from the early 90's (maybe even late 80's), although the early one's would have needed to be water cooled due to environmental restrictions, like the 300ZX that had minimal airflow to cool the turbos, and stepped to water cooled cores to help aide service life.

Just a quick note on oil cooled only. I bought a second hand Denco turbo kit from a mate (knowing full well that mine would be the third truck it would be home to) and it died in the last couple of days (I've owned it for about 70,000). Annoying and inconvenient as this was it has had a hard life in three trucks all giving it alot of schtick! I found out from Denco (using the tag number) that the turbo was infact at least 10 years old. Using the the standard that passenger cars accumulate approximately 20,000kms a year and fourbies do about 30,000 easy maths says it clocked up approximately 200,000-300,000kms. I'm pretty happy about it, so I bought another one. (didnt have time to rebuild it, needed the car on the road. But I might rebuild the old one and sell it off)

Rant over..
Tod-