jeanmarcboilard

Glad my GT2860s' are water cooled. Personally, I use the last few minutes of my drive as a cool down.

993GT

IMHO:
0 second for frequent centre section replacement
30 seconds for a 'down the street' drive,
2 minutes if driven enthusiastically,
5+minutes when at track
cut time in half for water-cooled turbo's

volv4life

and your heater core warms up that much quicker.

Fishey

I personally just drive though my neighborhood which always seems to bring the EGT temps down to what I would see at idle. I don't take any other precautions since it seems pretty wasteful what possible gains would I get if the EGT temps are no longer dropping at least not in any significant way.

There are certainly things you could do to make your Turbos last longer but at what cost and what gains. I have spare K16 Turbochargers from many upgrades I have done in the past.

The removal of catalyst would certainly help the exhaust system remove heat after cool-down tremendously.

You could also throw blowers onto the turbos at idle and after shutdown to remove more heat.

cbracerx

This is my approach also. A minute or so of calm driving followed by the neighborhood crawl.

"02996ttx50

my cool down protocol also depends upon whether or not I've been "in boost" or not. i tend not to cool down the turbos if i have been putting along under n/a power.

911 Rod

So if you have not been driving under boost cool down time is not required?

"02996ttx50

me? i dont "feel" it is. beyond a second or two.. tops.

vogz

I've always applied the "no boost" for last 5 minutes of my drive rule, to cool down oil cooled turbos. If I do go into boost in the last 5 minutes, I will let it idle for at least a minute or two after stopping. Common sense applies here. If you are hooning the **** out of the car, more cooldown time is a good idea. I've never had a problem with any oil cooled turbos simply using common sense.

wross996tt

Just curious for those of you that don't cool down at idle...do you have any idea what your turbos look like? Just saying you have no apparent problem is not really data to draw conclusions from. Again, I defer to the master who has actually rebuilt 100s of our turbos (aka Kevin)...Idle cool down for 60-120 seconds NO MATTER WHAT.

Macster

You are still shutting off the engine with the turbos hotter than they would be had you let the engine idle the recommended amount of time.

Driving with engine RPMs obviously above idle even though the engine is not making any boost still has the turbos hot, relatively speaking.

The cool down ensure the turbos are as "cold" as they can be before the engine is shut down.

Dock

+1

vogz

Slightly hotter, sure, but nowhere near hot enough to do any damage. I've never had any issues with turbos doing what I do. Turbos get REALLY hot in boost, and cool down quickly out of boost. A turbo that has been exposed to steady state operation under 3000rpm and out of boost for 5 minutes will be very cool relative to a turbo that has just completed a 1/4 mile run.

wross996tt

Do you actually have any data to support this? Kevin gave me turbo temps even when not boosting and they are extremely hot...they drop significantly with an idle cool down...he actual has data not "feelings".

vogz

I used to shoot the turbo on my S60R with my infrared heat gun after driving it out of boost and after idling. The temperature difference was within 100F, which is a tiny difference on a turbo.