Quote:
Originally Posted by jedi_sol
Maybe, not necessarily. Depends on how the turbo is cooled.
On my sti, the turbo is water cooled, therefore, no need to let the turbo cool down. Even the owners manual says no need to allow the turbo to cool down before shutting off the car. Therefore, i interpret that as there is little risk in damaging the turbo with EOC cycles.
From other WRX STI forums:
The water gets into the turbo, cooling it down, evaporates from heat, that vapor goes into return line, new water gets into the turbo, cools it further, and the cycle continues even with the engine off. Just pulling into a parking spot will give your turbo all the cooling down it needs.
However, if none of this is correct, at least i've got a 60,000 warranty on my car  |
I agree with the above, however, when you EOC, you run the turbo at high load/ boost and instantly turn it off. That's quite a bit different to the pulling into a car park scenario where you'll be driving for at least 30 seconds off boost. I don't think any OEM's are testing their turbos for EOC conditions.
Moreover, it's not only the cooling that's the issue, it's the potential for starving the turbo bearings of oil (turning the engine off while the bearings are still spinning.