I've read somewhere that putting on a turbo timer is a waste of money because S4 has the after-run
#3
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Mine has never run. With that said, you still don't need a turbo timer. Just stay out of boost the last couple minutes before you shut down. It is much better to drive around out of boost compared to sitting in place with the car running.
#4
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rarely goes to 250... so does that mean I could just turn off after driving? When do you know to turn off your engine after a hard run? Is the oil temp accurate or should I get an exhaust temp instead?
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#8
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You should stay out of boost the last couple min no matter what. You rarely need to to wait to shut down your car if you do so. As long as my gauge shows me below 225 (99% of the time) and I stayed out of boost for a min or two before reaching my destination, I shut down instantly.