oil cooler- over heating and turbo question

[brad 93hilux]

I have questioned this idea before and was origionally going to install but never got around to it...

Now i have a 2.8 turbo diesel lux, i have moved over to WA in which driving in the heat seems to be making the lux over heat even worse then what it was in NSW...

I have noticed the overheating problem is worse the more boost i put into the engine... So i was thinking the turbo is oil cooled only, and since the 2.8 runs a factory oil cooler in the block and uses engine coolant to cool the oil- the more boost, the more heat, and the more heat, the more the already stuggling radiator cannot keep up with the temperatures...

Does this sound correct, fitting a oil cooler onto the engine to try to reduce the oil temperatures thus lowering the water temperature?

There was also a couple of things, does the factory oil pump push enough oil pressure to run through the oil cooler. And what effect does this have on quantity of oil inside the engine (do you need a bigger sump or slightly over fill it the first time)

Any ideas would help or some info on what you guys have tried?

Cheers
Brad

[tweak'e]

what turbo are you using and at what boost ?

if your using the usual CT20 its not surprising. they beat the crap out of the air especially at high boost and or course thats worse when you have it fitted on a bigger motor as its trying to flow even more air.

hi flow the turbo, fit intercooler or even water injection.

or simply wind the boost down so the turbo is running in a more efficient rpm range.

[SIMMO84]

Ive got one on mine, its on the pressure line from the block to the turbo as far as i know every thing is standerd, its identicle to the ones that commodores have for there tranny cooler.

[one_waz]

i would like to know how you go with it as i am having the same problem i have put a ct20 onto my 2.4 and when i get to 100kph the water temp can get up to over 100 degrees C it seems that when the turbo is at full boost sitting at 100kph and the EGTs come up is when it over heats, if im just cruizn round the bush its fine.

P.S the ct20 is water cooled aswell

Waz

[brad 93hilux]

i would like to know how you go with it as i am having the same problem i have put a ct20 onto my 2.4 and when i get to 100kph the water temp can get up to over 100 degrees C it seems that when the turbo is at full boost sitting at 100kph and the EGTs come up is when it over heats, if im just cruizn round the bush its fine.

P.S the ct20 is water cooled aswell

Waz

I wish mine was only 100 degrees, mine sits around 100 degrees around 100-110kmph without a load on the ute... usually over here i'm driving around with the water temp around 115 degrees, once it hits this amount i have to start backing off as 120 degrees hits the red on the factory temp gauge...

I have a turbo glide turbo kit running a t25 turbo at between 9-10psi boost, i was running a intercooler but i took it off as it started to rub on the rocket cover and got a leak, so i'm back with the standard turboglide crossover pipes. Also running a 2.5" exhaust.

i had this set up brand new by turboglide 3 years ago and it was all dyno tuned at the time, it does not blow any smoke but still has this problem..

Brad

[tweak'e]

clean the raditor.

also check the fan, quite common for them to fail. however you can redo the silicon in them and get them working properly again.

[brad 93hilux]

about 12-16 months ago i bought a brand new radiator and repacked the clutch fan with 2 tubes of the silicon grease....

I have a bull bar winch and spotties sitting in front of the radiator which would not help... but thats why i was questioning about the possibility of a oil cooler to help get rid of some temps?

[berad]

small turbo + more boost = out of efficiency range = alot more heat to produce the boost.

have you got a pyrometer?

[yamaha__308]

Wow, my thoughts exactly brad, just been through the same problem myself.

2L with a schwitzer turbo running 10psi boost. It overheats on hot days up long hills on the highway - water temp gets up to 105 before I back off. Around city water temps are about 85-95. When the EGT gets to about 400+ for a extended period then the water temp jumps. However as soon as the EGT drops, the water temp drops within a minute or so, which makes me think cooling system is fine, just the turbo puts out too much heat under load. Runs fine through city and bush. Clean rad, new fan clutch. Next is new thermostat. Fitted a oil cooler on the weekend. Seems to pump out a lot of heat but i havent had a chance to test it properly on the highway yet.

[brad 93hilux]

small turbo + more boost = out of efficiency range = alot more heat to produce the boost.

have you got a pyrometer?

nah i have one here but not installed yet.. might do it the next couple of days

[brad 93hilux]

Wow, my thoughts exactly brad, just been through the same problem myself.

2L with a schwitzer turbo running 10psi boost. It overheats on hot days up long hills on the highway - water temp gets up to 105 before I back off. Around city water temps are about 85-95. When the EGT gets to about 400+ for a extended period then the water temp jumps. However as soon as the EGT drops, the water temp drops within a minute or so, which makes me think cooling system is fine, just the turbo puts out too much heat under load. Runs fine through city and bush. Clean rad, new fan clutch. Next is new thermostat. Fitted a oil cooler on the weekend. Seems to pump out a lot of heat but i havent had a chance to test it properly on the highway yet.

let me know how it turnes out, it would have to help..
Where do you have it plummed into? any chance of a couple of pics?
Im thinking to put mine on the outlet of the turbo oil line, (cool the hot oil that comes from the turbo before it goes back to the engine)

Cheers

[RAY185]

Rather than inceased oil temps, I would suggest the issue is in the intake air temps with the turbo working at your set pressure. If you want to run high boost pressure you need to intercool it to cool the charge air, not cool the oil temperature generated by the turbo working harder. The higher the boost, the higher the intake temps and therefore the higher the exhaust temps. Drop your boost pressure to something reasonable (6-8psi or so) and your temps should drop. Otherwise intercool it.

I'm assuming you guys are running turbos on non turbo motors so the engine internals are not designed for forced induction to start with, let alone the intake temps you're feeding it by running excessive boost without an intercooler.

[SIMMO84]

Mine has never got hot, not even close, i do have an oil cooler (whether it helps or not) and i know its not right but im pretty sure it has no thermostate (havent touched it since i got it) dont know what boost but it wouldnt be much. Also dont have a shroud for the fan has A/C and spotlights.

[Guy]

Better dump pipe\exhaust to lower backpressure.
Lower your boost and fuel a bit, less fuel = less heat. You may be slightly down on power (from where you are now) but you will have a more reliable motor.

[hilux79]

Im thinking to put mine on the outlet of the turbo oil line, (cool the hot oil that comes from the turbo before it goes back to the engine)

Cheers

Don't think that would work as the turbo would gravity feed into the sump at present and by putting your cooler there would be a restriction.

[one_waz]

for the record the ct20 turbo is a standard toyota turbo that im pretty sure is made to run at 9-10psi.

my story is similar to the others it is intercooled and runs a 2 1/2 or 3 inch (not sure) straight through exhaust i have a pyro gauge and similar to yamaha the engine temp only rises when the egt are high 350+ constantly (at 100kph) i am also running a brand new v6 alloy radiator with twin thermos, it doesnt smoke and has the power but just heats up.

if there is anyone running a oil cooler can u please post some pics as to where u run it from and to etc as this seems to be the only thing that i have done yet to get the temp down.

cheers.
Waz

[yamaha__308]

My oil cooler (19 row) hasn't helped keep the temp down. Around town temp is marginally (1-2 degrees cooler) better but once on the highway and on the gas, the temp rises. I'm going for a longer trip during the day on the weekend which should test it properly.

Sorry dont have net connected yet at my new place so no photos as yet.

I used a kit from ebay with the sandwich plate run off the oil filter. I used the shorter Z170 filter instead of Z9 to allow it to fit between the inner guard and block. Cooler itself is mounted behind my front bar, which has no direct air flow. However when I removed the bar, there was no considerable improvement.

My next attempt will be an intercooler, it seems logical, as RAY185 stated.

Cheers

[RAY185]

for the record the ct20 turbo is a standard toyota turbo that im pretty sure is made to run at 9-10psi.

my story is similar to the others it is intercooled and runs a 2 1/2 or 3 inch (not sure) straight through exhaust i have a pyro gauge and similar to yamaha the engine temp only rises when the egt are high 350+ constantly (at 100kph) i am also running a brand new v6 alloy radiator with twin thermos, it doesnt smoke and has the power but just heats up.

if there is anyone running a oil cooler can u please post some pics as to where u run it from and to etc as this seems to be the only thing that i have done yet to get the temp down.

cheers.
Waz

Do you have a boost gauge? If not get one and let us know what boost its running at. IMHO a boost gauge is imperative. You may have wastegate issues causing it to spike causing excessive pressure and heat. You could potentially pop a vac hose off at some stage without knowing and cause the turbo to reach max boost and do some real damage. At least a boost gauge will allow you to monitor whats going on. Otherwise, like love_mud said, you could have your fuel set too high causing overheating too. Bottom line is, there's a few things that might be causing the overheating, but I dont think fitting an oil cooler is going to solve it/achieve much as Yamaha_308's experience indicates. Just my opinion...

[one_waz]

yeah i have got a boost gauge and the boost is normal, doesnt spike or anything like that max is 9psi as for the fuel i am yet to change anything from when it was running N/A so i dont think that over fuelling would be the case. that sucks about the oil cooler thought it might help :( maybe have to try and find a bigger radiator like a V8 one or something, im no mechanic but i dont think that the engine will last that long running at those temps

cheers

[ChunkyCharcoal]

I have a turboglide setup on mine with a 2.5" exhaust and standard radiator. No overheating ever... So by my experience the standard radiator should be capable of keeping a turbo'd 2.8 cool enough.
I reckon you have to look at another avenue. Like Ray 185 said, wastegate etc.

[yamaha__308]

I have a turboglide setup on mine with a 2.5" exhaust and standard radiator. No overheating ever... So by my experience the standard radiator should be capable of keeping a turbo'd 2.8 cool enough.
I reckon you have to look at another avenue. Like Ray 185 said, wastegate etc.

What boost are you running? What does your water temp get to? What about EGT temps? Intercooler?

Cheers

[hilux79]

I have a turboglide setup on mine with a 2.5" exhaust and standard radiator. No overheating ever... So by my experience the standard radiator should be capable of keeping a turbo'd 2.8 cool enough.
I reckon you have to look at another avenue. Like Ray 185 said, wastegate etc.

Is that with the factory temp gauge or aftermarket gauge?

My factory gauge does not show any change between 80 and 105deg.
I would not trust the factory gauge.

I Run 10psi in my 2.8 with a CT20 and once my EGT's go past 400 water temp starts going up seams to settle out around 100deg but everything in my cooling system is new now.

[berad]

Do you have a genuine radiator? i have an aftermarket job in mine (not turbo) and it overheated under load, i took the spotties off the front and it was all good, but aftermarket cheapies are no comparison to oe specs.

Is your clutch fan hub working? also replaced mine and solved the overheating issues, you should be able to hear it when it comes on i could hear mine over a set of muddies doing 100 on the highway.

Dumb question : You do have the shroud on the radiator? if not put it on.

[yamaha__308]

Thought it would be a good idea to update my progress.

Ive been on a few highway since the oil cooler install. It seems to have made a difference, the water temp takes longer to rise and quicker to fall. It would still heat up to over 100 C under high boost and EGTs.

I spoke to a couple of diesel mechs who both suggested to turn the fuel up in small increments and see how it goes. At first i thought this would just add to my heating problems but it has seems to run cooler now.

I turned the fuel up until a bit of smoke off idle and it runs cooler and faster too! Took it for a run yesty and had the EGTs around 400 C and between 5 and 10 psi boost and the hottest i could get it was about 98 C.

However I still plan on an intercooler to make it a more reliable engine.

[hilux79]

How are your EGT's now when it being pushed hard? Have they gone up much?

[yamaha__308]

Suprisingly not by much. I still havent seen over 450 C - which makes me think i still have to wind it in a bit more. I havent found a steep enough hill yet though.

[guzzla]

Mate the oil and water temps are going up because you're pumping so much hot air into the engine, they have no other choice but to absorb it.

Excessive heat in the combustion chamber is a recipe for disaster and assuming the rest of your cooling system is in top nick, by not fitting an intercooler or backing the boost off I'd say your engine may be not hang on for much longer.

cheers,
Nath

[yamaha__308]

Mate the oil and water temps are going up because you're pumping so much hot air into the engine, they have no other choice but to absorb it.

Excessive heat in the combustion chamber is a recipe for disaster and assuming the rest of your cooling system is in top nick, by not fitting an intercooler or backing the boost off I'd say your engine may be not hang on for much longer.

cheers,
Nath

Thanks Nath, As previously said, my next move is an intercooler.

However I still plan on an intercooler to make it a more reliable engine.

My next attempt will be an intercooler, it seems logical, as RAY185 stated.

[Mattoz]

i put a ct20 setup on my 2.8 mid last year without an intercooler buti did fit a pyro. its always hot up this way but i just drive to the pyro and have had no overheating problems.

Everyone tells me that i need a bull bar but i think it helps this cause by not having one