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Discussion Starter · #1 ·
I picked up my S40 T5 AWD the other day. This is my first turbo and I know reliability has improved with the later model turbos. Do the new turbos need to cooldown before switching them off? What kind of driving / length of trip / other factors would bring the turbo to the point that a cooldown is necessary? If I drive under those conditions, but the last few miles of the trip the car is driven a little less hard, does that contribute to a good cooldown?<p>Maybe turbo manufacturers could learn a thing from Microsoft, and have a message like, "It is now safe to turn off your car" <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/wink.gif" BORDER="0">
 

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Re: Turbo -- should car idle before turning off engine? (zben)

you should run thin syntetic oil (not Volvo's rec syntec which is plain dead dino). This is a water cooler turbo, so unless you are autoX I would not bother or say right after a 1/4 mile...
 

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Re: Turbo -- should car idle before turning off engine? (zben)

Only if you've run it hard in the two minutes preceeding shutdown. If so wait 2 minutes before shutoff, this allows proper cooldown. <p>If you drive normally without racing to your driveway then no wait is required.<p>I read this in the owners manual the day I picked up my car - give the manual a once through... you'll come accross dozens of tidbits that will serve you well.<p>
 

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ss60 explained it perfectly and he is exactly correct. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0">
 

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Re: Turbo -- should car idle before turning off engine? (zben)

30 seconds is enough, after highway make it 1 minute.
 

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Re: Turbo -- should car idle before turning off engine? (ss60)

I did RTFM, specifically looking for something about a cooldown period but did not find anything.
 

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Re: Turbo -- should car idle before turning off engine? (tomi22)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>tomi22</b> »</i></TD></TR><TR><TD CLASS="quote">30 seconds is enough, after highway make it 1 minute. </TD></TR></TABLE><p>Based on EGT gauges on other turbo cars 1:30 - 2 minutes is the correct duration.
 

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Re: Turbo -- should car idle before turning off engine? (zben)

I believe I may have seen a reference to a cool-down period in the "quick facts" brochure that comes with the owners manual.
 

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Re: Turbo -- should car idle before turning off engine? (Dede)

don't know for sure, used to be VERY paranoid on this as this is my first turbo car. used to drive like 25 mph not reving more than like 1500 for 1-2 mile drives and let it idle for 2 plus minutes. now I just drive normal and all is good. agree that with aggresvie 5000 rpm plus driving , I would idle as well as something like a 1/4 run but just normal or slightly spirited , don't idle any more.
 

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Re: Turbo -- should car idle before turning off engine? (zben)

Maybe turbo manufacturers could learn a thing from Microsoft, and have a message like, "It is now safe to turn off your car" <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/wink.gif" BORDER="0"> [/QUOTE]<p>I had a 96 850 turbo and a 90 mercury capri XR2 they both had a warning sticker on the drivers sun visor recommending 30 sec of cooldown time. Not exactly a msg like microsoft but it was a constant reminder. I have a 97 mitsu eclipse and not even in the owners manual does it say anything about cooldown. I still try to give both turbo cars a chance to cooldown.
 

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Re: Turbo -- should car idle before turning off engine? (zben)

The bottom line seems to be: Let it cool down a bit, but do not treat your car like an egg <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/smile.gif" BORDER="0">
 

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Re: Turbo -- should car idle before turning off engine? (Nairb)

Although if Car makers were more like Microsoft:<p>1. Every time they repainted the lines on the road, you'd have to buy a new car.<p>2. Occasionally your car would just die on the motorway for no reason, and you'd have to restart it. For some strange reason, you'd just accept this, restart and drive on.<p>3. Occasionally, executing a manoeuvre would cause your car to stop and fail to restart and you'd have to re-install the engine. For some strange reason, you'd just accept this too.<p>4. You could only have one person in the car at a time, unless you bought a "Car 95" or a "Car NT". But then you'd have to buy more seats.<p>5. Amiga would make a car that was powered by the sun, was twice as reliable, five times as fast, twice as easy to drive - but it would only run on five percent of the roads.<p>6. Macintosh car owners would get expensive Microsoft upgrades to their cars which would make their cars go much slower.<p>7. The oil, engine, gas and alternator warning lights would be replaced with a single "General Car Fault" warning light.<p>8. People would get excited about the "new" features in Microsoft cars, forgetting completely that they had been available in other cars for many years.<p>9. We'd all have to switch to Microsoft gas and all auto fluids but the packaging would be superb.<p>10. New seats would force everyone to have the same size butt.<p>11. The airbag system would say "Are you sure?" before going off.<p>12. If you were involved in a crash, you would have no idea what happened.<p>13. They wouldn't build their own engines, but form a cartel with their engine suppliers. The latest engine would have 16 cylinders, multi-point fuel injection and 4 turbos, but it would be a side-valve design so you could use Model-T Ford parts on it.<p>14. There would be an "Engium Pro" with bigger turbos, but it would be slower on most existing roads.<p>15. Microsoft cars would have a special radio/cassette player which would only be able to listen to Microsoft FM, and play Microsoft Cassettes. Unless of course, you buy the upgrade to use existing stuff.<p>16. Microsoft would do so well, because even though they don't own any roads, all of the road manufacturers would give away Microsoft cars free, including IBM!<p>17. If you still ran old versions of car (ie. CarDOS 6.22/CarWIN 3.11), then you would be called old fashioned, but you would be able to drive much faster, and on more roads!<p>18. If you couldn't afford to buy a new car, then you could just borrow your friends, and then copy it.<p>19. Whenever you bought a car, you would have to reorganise the ignition for a few days before it worked.<p>20. You would need to buy an upgrade to run cars on a motorway next to each other.<p>Courtesy of GM CEO, Mr. Welsh
 

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Re: Turbo -- should car idle before turning off engine? (tomi22)

bottom line is just turn it off unless you just finished a 1/4 mile or autoX or some high speed blast. It is a water cooled turbo. Also run a thin true synthetic oil not syntec which is dead dino. The problem with hot shut off is oil coking on the bearing and shaft and the synthetic has a high burn up temperature, thin is good because there is much more flow thru the bearing.
 

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Salesman told me there is an electric oil pump on S40 that takes over at shutdown and runs for a minute or so to address cooldown issues.<p>Is this bogus info or fact?<p>Thanks!
 

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Re: (treacherous)

the last 5 miles of my drive home is a steep winding uphill 2 lane road... lots of fun to drive, but speaking from experience it is hard on tires, brakes and rotors (and the engine, although none of the cars I've owned while up here have had engine problems).<p>I usually let my car run for about a minute when I get into the driveway, and after turning it off, there is some sort of pump or fan that will run for a while (time it runs for seems to depend on how hard I push the car on the way up the hill). This makes me think that the car will not just shut down cold, and has this built in as a way to protect itself from shutting down while too hot... BUT, I could be totally off base. I'd love to know for a fact that this is the case, so I could feel better about hammering the car and not letting it run forever in the driveway.
 
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