Quote:
Originally Posted by MT930
what's a turbo timer ?
Do you mean boost pressure gauge ?
|
Turbo timer is an aftermarket device that keeps the motor running for some programmable time after you switch the ignition off.
The factory does this via one of the extra relays in the back of the 930 engine bay - makes the car run on for 10-30 seconds after the ignition is switched off. This is because turbos spin up to 100,000 RPM - they don't stop turning immediately when you turn the ignition off.
KKK's are plain bearing and oil-cooled, they rely on the motor for their oil supply. If your 930 doesn't run-on, you're likely missing the relay, or it doesn't work correctly.
Read a test drive of the 935K3 where the guy cut the motor on the pit road, coasted in, stopped, unstrapped and got out and could hear the turbos still turning... Then the pit boss asked him not to do that...
On the other hand, I don't have this relay or the associated wiring and my turbos last just fine. Just drive a mile or two off-boost or let the car fast-idle for a few minutes before turning off the ignition. All you're looking to do is avoid killing the oil supply to a red-hot turbo spinning unreasonably fast.
If not been hitting boost, I switch it off just like an N/A car.
The thing you should probably be more concerned about with a really, really, hot turbo (e.g. one that was 1450 degrees and glowing cherry-red a few seconds ago), is just switching off and having the heat-soak turn the oil to coke. Do a search on the 930 forum.
The factory timer is intended so that non-gearheads can drive a production car, but I wouldn't rely on it to protect from extreme scenarios like that - it doesn't run on long enough
So you might as well take charge of the cooldown procedure yourself. But then, I like manual heat, too
