'Oil cooled' turbos

[Endless]

So bascially sounds like if your using an oil cooled only turbo for track purposes it would be a good idea to invest in an external oil cooler.

Not going to matter anywhere near as much on the street.

[thechuckster]

siktoy: not doubting you, but what EGTs do trucks run at compared to petrol engines? I thought they were lower, but am not sure.

[SIKTOY]

Sorry chuck but what are EGT's

[thechuckster]

exhaust gas temperature

[SIKTOY]

A diesel engine would run hotter EGT's as deisel burns hotter than petrol
also my truck doesn't use a waste gate the turbos run full bost all the time

[nick.parker]

A diesel engine would run hotter EGT's as deisel burns hotter than petrol
also my truck doesn't use a waste gate the turbos run full bost all the time

I think diesel runs cooler and this is precisely why people say dont use a diesel turbo on a petrol engine, the cheaper materials/ design (I assume) can't take the higher heat of the exhaust from a petrol engine.

Cheers, Nick

[Matt-AE86]

engines are oil cooled, just has the coolant to help a little

[Nat]

Just a quick Q, I have a turbo kit for NA JZA80 supra, the oil supply i got i wasnt happy with, so i bought a different oil supply/return line setup from the states with sandwich plate, ect.

The flange that i have now has a very small oil inlet compared to the one that orignally came with the turbo, Like a 2-3mm's , says with the oil supply kit i bought that it is a restricter to limit oil supply, but that the hole can be drilled out if needed. The Flange that came with the tubo has a significanlty larger hole 5-6 mm from memory. The turbo is a T4 flanged T61.

What would be the ideal size of the oil inlet on the top flange for the turbo.

[MWP]

engines are oil cooled, just has the coolant to help a little

This almost deserves a -ve rep

[The Real Roadrunner]

this could be argued for months.
corky bells book is great for a read but it is how many years, old if you think its the bible please buy a torana and go suck thru.
look at a ta45, this is a truck turbo off a 12l diesel if you want the p/n ill get it.
FACT: if its designed oil only it wont be a roller and should use about 4lpm of oil this will cool it enough to do the job its designed for. (unless its china crap)
FACT: if you take your car to a circuit and drive it hard regularly and dont have an oil cooler your lacking grey matter as not only could a turbo die but so can an engine.
FACT: i have used TRUST turbos on many cust cars and never had a prob with them whilst drifting (low speed, high revs, 1.5 bar boost)

if you dont run water on a roller it will die quickly as they only use 1/4-1/2 the oil.

[wilbo666]

I was under them impression that the main benefit of water cooled turbos is being able to turn them off sooner, compared to oil only turbos....

The water effectively is a heatsink...I figure that the car manufactures were pretty well forced into doing what ever they could to try and avoid the fact that mr joe public wasn't going to idle his car for a number of mins before turning it off each time! (Back when turbos first came out they had an image with the public as not being reliable and robust....)

I figure that car manufactures saw the water cooled core as a good way to build in more of a buffer so that more abuse (generally at shutdown IMO) could be handled!

That's kinda what I thought / think!

Cheers
Wilbo

[mic*]

There are so many variables here that its not funny.

As a very big generalisation, water cooled turbo's are great for factory / mild street cars coz they allow much of the residual heat in the turbo to be dissapated into the coolant rather than the oil (water conducts heat well, oil poorly) when proper shut down procedure is not always adhered to by daily drivers.

Thus the oil left in the turbo does not get too hot and coke when the engine is thrashed and shut down.

For an enthusiast to coke a turbo would be a little embarassing i think.

My 2c

EDIT: too slow to type, thanx will

[The Real Roadrunner]

yes wilbo your on the right track it was more due to manufacturers not wanting to replace turbos under warranty than anything else and yes that two mins probably does make a diff with an oil only but not so much a watercooled.

[30psi 4agte]

[QUOTE=
look at a ta45, this is a truck turbo off a 12l diesel if you want the p/n ill get it.

FACT: if its designed oil only it wont be a roller and should use about 4lpm of oil this will cool it enough to do the job its designed for. (unless its china crap)
.[/QUOTE]

From memory : You are correct in saying that the Ta45 is a truck turbo but i think you will find it uses totally different compressor / turbine wheels for a petrol engine.
Turbonetics mod them to sut petrol.

Correct me if im wrong but arent there oil only rollers.around ??

[The Real Roadrunner]

no change in the wheels or trims ive compared a large rotary modifiers one to a cat one. the new GT series may be different from old TAs i havn,t had the chance to compare.

if you find an oil only roller id be shocked as the small amount of oil they actualy have flowing would cook damn quick. or you could pump in 4lpm and defeat the purpose of it by slowing the bearings down .