Preventative maintenance question... sorta.
02-12-2002, 10:45 AM
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Preventative maintenance question... sorta.
After reading various posts here over a few weeks, I have come to know a little more about my 99.5 A4 1.8T. Several of you have said that the turbo doesn't really kick in until about 3000 rpm. Also, others have said that after driving your car, you try to "cool" the turbo down, or at least you don't stomp on the car like crazy and then just park it. So would it stand to reason that if you keep the car under 3000 rpm 5 or so minutes before you park it, the turbo would be cooler? Would that benefit the engine in any way? When you say the turbo doesn't really kick in until 3k rpm, does that mean it doesn't do much until then, or that you don't feel its effects until 3000 rpm? BTW the car is just stock.... for now. Thanks,
Steve, a Newbie trying to take care of his new Deutsches Baby....
Steve, a Newbie trying to take care of his new Deutsches Baby....
02-12-2002, 10:52 AM
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Stock turbo kicks in just under 2K rpm ....
running it for 5 minutes will help the turbo cool because it is cooled by circulating engine oil. If you shut off the car, the oil stops circulating.
I don't think you need full 5 minutes of cooling though, unless you were racing the car on a track.
For normal driving, 2 minutes is probably more reasonable, if that much.
Many people use the door chime as a guide - open your door after you park the car. The chime will begin. After it stops, switch off the engine.
Some more cautious of us use Turbo Timers.
If you have a chip and make your turbo work harder, the cooling part becomes even more important.
I don't think you need full 5 minutes of cooling though, unless you were racing the car on a track.
For normal driving, 2 minutes is probably more reasonable, if that much.
Many people use the door chime as a guide - open your door after you park the car. The chime will begin. After it stops, switch off the engine.
Some more cautious of us use Turbo Timers.
If you have a chip and make your turbo work harder, the cooling part becomes even more important.
02-12-2002, 10:52 AM
#3
Yep... Basically if you take it really easy for the last mile or 2,
then let it idle for a minute, you should be fine. What you want to avoid, it having the turbo get really hot and suddenly shutting off the engine. What happens is, the oil suddenly stops flowing over the bearings, and it just sits there, burning. Eventually, the oil sludge will build up to the point that the bearings stop turning, and the turbo needs to be rebuilt.
By giving the turbo a few minutes to cool off, you reduce this likelyhood.
By giving the turbo a few minutes to cool off, you reduce this likelyhood.
02-12-2002, 10:53 AM
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It's not RPM dependent, it's load/boost. Flooring the car at low revs can be worse than driving....
in the upper rev ranges w/o boost.
If you hear turbo whine, you're working the turbo. Just drive nice and easy the last few miles, and let it idle for a little bit before you park, and you'll be ok.
Even better - get a TT for $100 - your time's prolly worth that much. I know mine is.
If you hear turbo whine, you're working the turbo. Just drive nice and easy the last few miles, and let it idle for a little bit before you park, and you'll be ok.
Even better - get a TT for $100 - your time's prolly worth that much. I know mine is.
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