Waiting on FI

Sh0velMan

Yeah, 'cause once the engine stops, the flow of oil stops (I'm pretty sure water cooled turbos are a thing of the past).

If you roar into your driveway and kill the engine, the turbos could be spinning at 20000+ RPM when that flow of oil stops, meaning your bearings can go basically dry before the turbine stops spinning, and the little bit of oil left in them will cook off, causing damage over the long term.

Edit: Hell, for that matter, I like to give the engine itself time to cool down before I kill it in my N/A setup. The heads in our cars generate a lot of heat when driving and giving it some time to cool down at idle (the oil helps take heat from the valve train) doesn't hurt at all.

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Chuck33079

The GTM turbos are both oil and water cooled. Since the turbos are mounted so low, the coolant will continue to cycle for a little while after shutdown. I still let it idle for a minute or two so the oil doesn't have a chance to coke in the lines and bearings (although modern synthetic oil doesn't do that like it used to).

No real reason for a turbo timer. It doesn't cost anything to sit in the car for a minute after you get where you're going.

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