turbo timer for TT's?
Thread Starter
|
1st Gear
Joined: Mar 2008
Posts: 308
From: Denver
turbo timer for TT's?
i was on audizine reading a thread about a tt owners concern with a "electric pump" running after the car was shut off and one of the comments said "might be the pump that cools your turbo, hence tt's don't need turbo timer."
is this true? because im always very paranoid about "proper cooling" of the turbo and sit in my car until the door chime turns off before i shut off the ignition...
is this true? because im always very paranoid about "proper cooling" of the turbo and sit in my car until the door chime turns off before i shut off the ignition...
1st Gear
Joined: Apr 2008
Posts: 137
From: Claremont NH
I was told by the shop that did a bunch of work for me when i first bought the car that the 225 already has saftey measures in place that act like a turbo timer...it depends on how long the car has been running. They also said however that if you are really beating on it like dragging around town against the hondas lol to let the car run at idle for a few mintues before shutting it off. Most cases though it should be fine...any other opinions would be good since that is what i have gone off myself.
I'm make believe
Joined: Dec 2006
Posts: 17,587
From: In my head
The "afterpump" isnt a big deal and is not needed. It being water cooled alone is all that matters. Info from turbobygarrett which is seems people here need to read
The coolent keeps the temps from ever getting as hot by always pulling the heat away, even after the engine has stopped. AKA, pump not need, idling not needed.
Following a hot shutdown of a turbocharger, heat soak begins. This means that the heat in the head, exhaust manifold, and turbine housing finds it way to the turbo’s center housing, raising its temperature. These extreme temperatures in the center housing can result in oil coking.
To minimize the effects of heat soak-back, water-cooled center housings were introduced. These use coolant from the engine to act as a heat sink after engine shutdown, preventing the oil from coking. The water lines utilize a thermal siphon effect to reduce the peak heat soak-back temperature after key-off. The layout of the pipes should minimize peaks and troughs with the (cool) water inlet on the low side. To help this along, it is advantageous to tilt the turbocharger about 25° about the axis of shaft rotation.
To minimize the effects of heat soak-back, water-cooled center housings were introduced. These use coolant from the engine to act as a heat sink after engine shutdown, preventing the oil from coking. The water lines utilize a thermal siphon effect to reduce the peak heat soak-back temperature after key-off. The layout of the pipes should minimize peaks and troughs with the (cool) water inlet on the low side. To help this along, it is advantageous to tilt the turbocharger about 25° about the axis of shaft rotation.
Thread
Thread Starter
Forum
Replies
Last Post
