cool down after driving?
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You want to sit and idle a car after a hammering on track, RUBBISH!
Always 2-3 min cool down lap (not idle) not only to cool motor but to also cool brakes.
Surely you must have sat in a traffic jam before, ever watch that temperature gauge rise? not good for cars especially after a 20-30min hard track session.
Always 2-3 min cool down lap (not idle) not only to cool motor but to also cool brakes.
Surely you must have sat in a traffic jam before, ever watch that temperature gauge rise? not good for cars especially after a 20-30min hard track session.
I have sat in traffic and my temp. gauge never moves...ever. So you think it is better to let the extremely hot turbos cool down with no oil running through them? Just air cool? Why do you say not good? Admittedly I have no first hand experience, but my tuner who does build and re-build turbos has explained his first hand experience of turbos that have not been shut down appropriately. He has also put external temperature monitors on the turbos to watch the change in temp over the recommended 120 second cool down (vs. no cool down). BTW, Porsche in their very own manual recommends an idle cool down after hard driving....
Manthey is a well respected race team of course, but not sure I would go with the advice of a race team...after all they replace the engine and other components much more frequently than I would.
Cheers
Last edited by wross996TT; Jun 22, 2008 at 10:58 AM.
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To be honest, I would think both are doing the exact same process, but you are not having the car sitting idling which is not good especially after hard session (overheating)
We are talking about a cool down lap, no boost used
We are talking about a cool down lap, no boost used
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I admit, I thought the same until it was explained that there is a difference between idle cool down and driving cool down...again I think an external temperature probe would be data enough to provide insight into the theory (which has already been done).
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You guys are talking about different types of cooldown. The cooling you do on track is for the engine and brakes etc etc while the waiting afterwards is to cool the turbos. You don´t want to leave the oil sitting in 1000+ degrees hot turbos. You will sludge the oil in the turbos almost instantly..
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You guys are talking about different types of cooldown. The cooling you do on track is for the engine and brakes etc etc while the waiting afterwards is to cool the turbos. You don´t want to leave the oil sitting in 1000+ degrees hot turbos. You will sludge the oil in the turbos almost instantly..
Agree 100% here. Different issues. I'd do the lap and let it idle for 120 seconds. Just me.
And what I did at DE. One NEVER uses the parking brake after track time.....etc.
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You HAVE to cool down guys. Before synthetic oil, dyno oil would "coke" in the turbo lines causing clogs and subsequent starvation. While synthetic is not as prone to this, it can happen and you have to keep that flow going after you run it hard. If you're just puttering around town or drive very low rpm for the last minute or two, it accomplishes the same thing. Our turbos aren't even watercooled, which makes this even more imperative.
Another trick to avoid overheating is to keep the AC on. This keeps the fan in back spinning and the temps at the same level as if you were cruising on the highway. I use it all the time in traffic.
Another trick to avoid overheating is to keep the AC on. This keeps the fan in back spinning and the temps at the same level as if you were cruising on the highway. I use it all the time in traffic.
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You HAVE to cool down guys. Before synthetic oil, dyno oil would "coke" in the turbo lines causing clogs and subsequent starvation. While synthetic is not as prone to this, it can happen and you have to keep that flow going after you run it hard. If you're just puttering around town or drive very low rpm for the last minute or two, it accomplishes the same thing. Our turbos aren't even watercooled, which makes this even more imperative.
Another trick to avoid overheating is to keep the AC on. This keeps the fan in back spinning and the temps at the same level as if you were cruising on the highway. I use it all the time in traffic.
Another trick to avoid overheating is to keep the AC on. This keeps the fan in back spinning and the temps at the same level as if you were cruising on the highway. I use it all the time in traffic.