Revisiting the "do you cool your turbo down"
03-31-2005, 10:08 AM
#31
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Whilst i totally agree that you should allow a minute to cool the turbos after a good run, in the UK the handbook says otherwise!
I had an 02 tt and in the handbook all it said was to let the engine stabilize before shutting down.
I now have an 04 X50 and the handbook says nothing about letting the enging idle or stabilize. Infact all it bangs on about is how quickly you should drive off after starting.
Surely Porsche must be pretty confident of there product otherwise they would state a cool down period in the handbook?
I had an 02 tt and in the handbook all it said was to let the engine stabilize before shutting down.
I now have an 04 X50 and the handbook says nothing about letting the enging idle or stabilize. Infact all it bangs on about is how quickly you should drive off after starting.
Surely Porsche must be pretty confident of there product otherwise they would state a cool down period in the handbook?
03-31-2005, 11:11 AM
#32
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Originally Posted by solsavr
Excuse my ignorance, but why not install a turbo-timer, set it for two minutes, and walk away if you want? I assume that an aftermarket one can be installed?
Just curious...seriouly looking at a 02TT to replave my 03 C4S, and this is what i will do if you can!
Just curious...seriouly looking at a 02TT to replave my 03 C4S, and this is what i will do if you can!
IMNSHO, crap, we're sitting in cars that others dream of. . .enjoy the end of the song you're listening to, check your PDA messages, check the oil and a minute or two is passed. I dunno, I worked too f'ing hard to pay for the beast to not take good care of her and treat her at least as good as her parents asked me to.
04-01-2005, 02:01 AM
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For those having trouble reading the scanned image, the 04 manual says, "Do not stop engine immediately after hard or extended driving. Keep engine running at increased idle for about two minutes to prevent excessive heat build-up before turning off engine."
I don't doubt the expert mechanics contributing to this forum, but Porsche's rather tepid, single comment on page 65 of the manual (limiting the recommendation only after "hard" or "extended driving") does not convey the same urgency or importance as the many contributing to this and other threads. And while we all know that most Porsche dealers' service managers and techs have less than optimal knowledge, not only has no one at my dealership mentioned to me the need for a cool-down, but when queried, the Porsche service manager specifically told me no cool-down was required. "Just drive it," he told me, "You don't need to do anything different with this car."
For those that say you need to cool down every time you drive the car, citing the manual as their source, they're wrong. That does not appear to be Porsche's position in the manual or otherwise. The short blurb in the manual isn't even in BOLD type or under a "CAUTION" banner, like other information Porsche apparently considers important. My comments, however, do not mean that I doubt the experts (i.e., mechanics, not pundits) on this forum. But why doesn't Porsche give this issue higher priority?
Like several others commenting on this and related cool-down threads, I find it hard to let the engine "run at an increased idle" for two minutes everytime I go somewhere in my car. While many suggest tt owners should just chill and bask in the glory of their cars as the turbos likewise chill, I feel I'm constantly enjoying and basking. I drive my car every day. To take the kids to school (4 miles aways); to my office (5 miles away); to the market and video store (1 mile away); and on extended drives for business and pleasure.
I don't doubt the expert mechanics contributing to this forum, but Porsche's rather tepid, single comment on page 65 of the manual (limiting the recommendation only after "hard" or "extended driving") does not convey the same urgency or importance as the many contributing to this and other threads. And while we all know that most Porsche dealers' service managers and techs have less than optimal knowledge, not only has no one at my dealership mentioned to me the need for a cool-down, but when queried, the Porsche service manager specifically told me no cool-down was required. "Just drive it," he told me, "You don't need to do anything different with this car."
For those that say you need to cool down every time you drive the car, citing the manual as their source, they're wrong. That does not appear to be Porsche's position in the manual or otherwise. The short blurb in the manual isn't even in BOLD type or under a "CAUTION" banner, like other information Porsche apparently considers important. My comments, however, do not mean that I doubt the experts (i.e., mechanics, not pundits) on this forum. But why doesn't Porsche give this issue higher priority?
Like several others commenting on this and related cool-down threads, I find it hard to let the engine "run at an increased idle" for two minutes everytime I go somewhere in my car. While many suggest tt owners should just chill and bask in the glory of their cars as the turbos likewise chill, I feel I'm constantly enjoying and basking. I drive my car every day. To take the kids to school (4 miles aways); to my office (5 miles away); to the market and video store (1 mile away); and on extended drives for business and pleasure.
Just kidding.
04-01-2005, 06:21 PM
#40
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Originally Posted by mmcmilla
For those that say you need to cool down every time you drive the car, citing the manual as their source, they're wrong.
Like several others commenting on this and related cool-down threads, I find it hard to let the engine "run at an increased idle" for two minutes everytime I go somewhere in my car.
Like several others commenting on this and related cool-down threads, I find it hard to let the engine "run at an increased idle" for two minutes everytime I go somewhere in my car.
As for finding the time to accomplish the cool down, I find it just as easy to sit for two minutes in my garage or at a parking spot as I do to sit at a stoplight for two minutes.
04-04-2005, 12:26 AM
#41
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Since the predicitions of turbo death fall within the warranty period, why wouldn't Porsche add this a readable event on the DME? I'm still waiting for the onslaught of distraught owners of cars with failed turbos.
The photos of burned shafts have come with no descriptions of car use or mods. The assumption is that more cooling would have prevented the burned shafts, but there is no evidence of the connection in non-tracked cars.
I have no criticism of "coolers". It just makes no sense to me that neither the service reps, mechanics, or manual make a big deal of it. If it caused failure within the first 4 years, where are the warranty claims?
The converse has also not been proven- cool down leads to long turbo life. Pierre's experience suggests that long turbo life is related to not cooling down- or is unrelated to the issue altogether. AS
The photos of burned shafts have come with no descriptions of car use or mods. The assumption is that more cooling would have prevented the burned shafts, but there is no evidence of the connection in non-tracked cars.
I have no criticism of "coolers". It just makes no sense to me that neither the service reps, mechanics, or manual make a big deal of it. If it caused failure within the first 4 years, where are the warranty claims?
The converse has also not been proven- cool down leads to long turbo life. Pierre's experience suggests that long turbo life is related to not cooling down- or is unrelated to the issue altogether. AS
04-04-2005, 12:53 AM
#42
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Originally Posted by Alexander Stemer
It just makes no sense to me that neither the service reps, mechanics, or manual make a big deal of it.
In my opinion, the cool down recommendation by Porsche must be pretty darn important, because given their "green" approach to things, you'd think there would be no way they'd recommend sitting at idle for two minutes spewing out all those contaminates. One of the reasons Porsche recommends driving as soon as you start the car is *because* of air pollution, so for them to recommend a cool down has to be a hard pill to swallow...must be pretty important in their minds.
04-04-2005, 12:59 AM
#43
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Originally Posted by Dock
One of the reasons Porsche recommends driving as soon as you start the car is *because* of air pollution.
I have always let my cars warm up for at least a min or 2.
04-04-2005, 01:04 AM
#44
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Originally Posted by solsavr
Wow...Really? Isn't this a bad idea?
I have always let my cars warm up for at least a min or 2.
I have always let my cars warm up for at least a min or 2.
I idle warm up my Turbo to at least 130 degrees water temperature prior to driving.
04-04-2005, 01:16 AM
#45
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Alexander, I have 5 sets of turbochargers (K16's and K24's) to tear down this week. 3 of the 5 are in for upgrades and 2 are in for upgrades, but are leakers.. I will post the results.. One of them is an X50 with no mods except an exhaust..