For the sake of my knowlege, I need to know how the stock turbo cools down by itself. I've heard people say it's self-cooling.

When I run my car hard, I tend to let it run for one-minute before shutting it off, just to keep the fluids moving.

Is this necessary... would a turbo timer be cost effective, or would does it not make any real practical purpose.

thanks in advance

 

..the turbo on the WRX is water cooled thus no need for excesive running of the engine after driven.

But IMHO letting her cool down by not shutting the engine of after a hard run can't hurt. I personally use a Turbo Timer, but it's all up to the owner.

Here's an explanation from The EndWrench:

"It is not necessary to perform a "cool down/idling" procedure on Subaru WRX turbo models, as was recommended with past turbo models. "The current 2.0 liter turbo engine has a greater cooling capacity and, coupled with technology advances, makes this practice no longer necessary. This explains why information about a cool down is not included in the Impreza Owner's Manual."
"The heat contained in the turbo begins to vaporize the coolant at the turbocharger after the engine is stopped. This hot vapor then enters the coolant resevoir tank, which is the highest point of the coolant system. At the same time the vapor exits the turbo, coolant supplied from the right bank cylinder head flows into the turbo. This action reduces the turbocharger temperature. This process will continue until the vaporizing action in the turbocharger has stopped or cooled down."

 

yeah I feel the same way, I don't think it could hurt, and yeah it does look cool... alright time to start saving pennies