There are TWO main choices for this part
A turbo time is probably one of the most important parts left off a car when its made! Reason? Because there is some doubt over the risk and legality of encouragement of leaving a car running when no one is in direct control. However, this point aside, whether you choose to sit and wait or, "set and forget" this part WILL SAVE YOU MONEY!
When your car is running the turbo is cooled two ways, by the oil pumped through the bearing and (if fitted and additionally) a separate water line connected through the engines cooling system. BUT when you turn off the car, both these systems stop! Sure the fans may run, but this only cools the water in the radiator, not the engine, not the turbo!
The main aim is to never stop the car when the turbo is hot, as this causes the centre bearing to over heat (due to no oil flow) and eventually either seize or wear out very quickly.
From the start.
When your car is on boost, thermodynamically the turbine side (exhaust) gets extremely hot from the expanding gasses exiting the engine. This causes the centre bearing assembly to also get hot. This bearing is lubricated by engine oil, it is happy at temperatures up to 950 degrees centigrade! A temperature that is only achieved with antilag functions on race and rally cars.
On your car the turbo will glow red or orange (if
you drive it hard) around 350 - 500 degrees, when it has been on boost for times from 2
minutes and upwards.
What the timer does is replace you, from waiting for the car to cool down when you are rushing to leave the car parked after you have driven quickly to a meeting or as such!
When it is in "on" position and you turn off the ignition and remove the keys, it counts down from the pre set time you have chosen, (allowing the turbo to cool) and the engine oil to pass through the bearing as well as the water around it (in a separate water jacket) keeping the bearing at a happy temperature.
What time do I set?
You have to choose this, obviously if the car is cold and you move it in and out of the drive to move another car you need not use it at all. BUT if you have traveled "on boost" for ANY length of time you MUST allow the turbo to cool.
This must be one of the most common questions.
All people are different, so this is how you work it out for yourself!
Drive the car as you would normally, on a dark night, noting your boost and driving style. Park the car where its dark, note the time and lift the bonnet. Locate the turbo and see if its red or orange. Its important that its VERY dark and your lights are off. If its glowing, wait and note the time still. You need to wait until it is NOT any color at all. Then you can turn off the engine and note how long it took.
This way you can relate, driving, boost and time together. A good rule is MINIMUM 3 minutes! Try it again after a long trip and after you have driven the car hard for a short while. Remember, you can get the turbo hotter when driven hard in 3 minutes than a long freeway trip for hours! Its all related to boost and time on boost.
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