Is the turbo on the Evo water cooled?
 

Just wondering if the turbo has a water jacket or not?

Yes. I don't believe there's a mass produced vehicle coming off the assembly line with a dry center housing.

I believe it is oil cooled, not water cooled. This is the major reason a Turbo Timer is useful.

Technically yes it's oil cooled aswell. It is however watercooled aswell. The oil is for the bearings. The water is for the centerhousing assembly which includes the bearings.

yes, both oil and water...

So when shutting off....like most other modern turbo systems you'll have some convection cooling right? Does it work the same way like Audi or Subaru ? (unless running REALLY hard, no need to idle)

Hi,

I think there is convection so the coolant flows to help cool the turbo, but I still idle the car so the oil can continue to flow and avoid coking. If I haven't run hard, I'll drive slow as I approach dest and just idle for 30 seconds. If I've run harder, I'll idle a minute or more.

I've always cooled my turbo cars and never had to replace a turbo:

84 Saab 900 Turbo - 120K miles.
89 Probe GT - 70K miles.
00 Audi A4 1.8TQuattro - 70K miles.
03 EVO - 2K miles and counting :)

Thoughts?

FB

Thanks for the information. I'm still thinking about buying an Evo. I didn't have as good of luck with Saab Turbo. Had an accumulator to cool the turbo during shutdown but eventually lost a turbo anyway. Lasted 75,000 miles.

The 16G in the Evo is both water cooled and oil cooled. There are 4 lines to the center section. Oil in-Oil out / Water in-Water out. The oil is not for bearings. We have a Mitsu turbo, not a Garret. There are no ball bearing sections like in a Garret. Oil will still coke in the center section even without bearing races in there, so you still need to wait a few minutes after driving before you shut down. However, synthetic oil is less likely to coke.


Josh

I drive slowly before I park, let the TT run 3 minutes. No worries.

BTW, I've finally evolved... {thumbup}

Oil is there to lube the bearings and shaft along with it's cooling function. Though they are not ball bearings they are bearings.

How do I qoute myself saying "There are no ball bearings like a Garret." I don't consider Mitsu turbos to have bearings because if you saay "bearing" and "turbo" together, people assume that you mean ball bearing. I know the difference, most do not. How about, Garret turbo's have races, Mitsu turbos don't. How does that sound for clarification.

My history with the Mitsu/Garret Turbos

14B (2 different ones)
T-25 (3 different ones)
Small 16G (2 different ones)
T-28 (2 different ones)
Big 16G (2 different ones)

These include either removal or instalation. I did all the work myself. by look, I can tell you the difference between a 1st Gen DSM turbo oil return line and a 2nd Gen without it even being on the car. Hell, I could probably do it from just looking at the flange that bolts against the oil pan. No, I am not bragging, I am just letting you all know my background with the turbo's and the 4G63 in case you guys have any questions.

Josh

and my history with the Mitsu/Garret Turbos
I used to build them for many racers way before the import boom...
I worked for a turbo reman company, which will remain nameless that catered to at least one well known tuner on the board here. I'm old school and have been around the block. this is not new to me. Not braggin, just stating the facts.

Can't believe you guys are getting into a pissing match over the term bearing. :lol:


Definition:a : an object, surface, or point that supports b : a machine part in which another part (as a journal or pin) turns or slides.

It is a sleeve bearing. :dunno:
If it doesn't have balls then that means torrington bearings and needle bearings aren't uh bearings? :lol: