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Old 05-07-2012, 12:15 PM   #1
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Join Date: May 2011
Location: weehawken nj
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Smoking after autoX run

I have a 2000 boxster running a 3.4 911 engine.

Yesterday, as my dot legal slicks hot after a few runs, my times went down and lateral G's increased.

I pulled my car onto the grid to do another run, shut it off for a minute, and when I restarted, I had a lot of smoke. I pulled off of the paddock, held the engine at 2500 rpms for a few minutes, and the smoke disappeared. It did scare the hell out of me

Is there a modification I have to make to the AOS? I dont want this to happen anymore, what are you guys doing to prevent it?

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Old 05-07-2012, 12:29 PM   #2
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Turning the car off right after a hard run can cause smoke on the next start up. At high rpms, a lot of oil is pumped into the upper part of the motor and the scavenger pumps can't keep up. The oil doesn't have time to drain out of the top of the engine, causing the smoke on the next start.

Next time idle it for a few minutes after a run before you shut it down. This actually helps cool the car better than just shutting it down right away.
Current car

2000 Boxster 2.7l red/black

Previous cars

1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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Old 05-08-2012, 05:18 AM   #3
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Makes sense, thanks for the tip
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Old 05-08-2012, 04:59 PM   #4
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Join Date: Nov 2010
Location: Los Angeles
Posts: 7,665
Sometimes a big smoke screen means an impending AOS failure (the internal bladder is starting to tear). No cause for concern, if the AOS is failing it will get progressively worse over the next 2-3 weeks and then you'll know for sure that was the problem.

To the best of my knowledge, there are no mods available for the AOS.

1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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