991.2 - Smoke on startup after tracking

[ems_88]

Hello,

I am looking for some advice here.

I have a problem which only seems to happen while tracking the car.

Here is a scenario:
1. Drive an warmup, all is well
2. Have some fun maybe 10 ish laps, temps, oil pressure etc all seems good
3. Cooldown lap and in the pits, no smoke, while car is still running the engine absolutely no smoke.
5. When key off and key back on even after 1 minute - plumes of white / blue smoke
5b. I noticed when the car is put back to comfort mode while returning to pits and engine “stop start” kicks in - no smoke comes out when restarts.

This will eventually clear and issue doesn’t show up any more while in day to day use.

-> I took it to the track 2 times and both times it happened but I suspected AOS which as been just replaced! And didn’t not fix it. Exactly same issue on the second track day

Now some facts :

- Car has 57k miles
- Driver side turbo replace some time ago by other owner
- Driver side turbo intake hose has some evidence of dripping oil after the track
- Air / Oil separator just replaced
- previous investigation by the Indy states it’s 99% not the turbo itself
- never happens at day to day driving!

I really doubt it’s normal but I seen some people fit those:
- catch can 1
- catch can 2

 

[steven.cox]

That looks like the turbos have got the issue with oil getting in them. I had exactly that on my 991.2 CS had both replaced under warranty by Silverstone Porsche

 

[steven.cox]

Should have added mine happened on a track day too

 

[911hillclimber]

This may be completely wrong!

I was blighted by this kind of 'event' on my 987.2 2009 Boxster.

2 AOS, no change etc. Car not tracked.

Sorted 99% by simply getting the oil level at 2 segments BELOW the max when hot. Check this level as per the normal method by the dash count-down.

Did this on the car 3 years ago.

I stress: this car is not pounded on the track or road so not sure of the effect on oil surge and starvation (etc).

Might be wise to ask a good indie specialist close to you?

 

[ems_88]

That looks like the turbos have got the issue with oil getting in them. I had exactly that on my 991.2 CS had both replaced under warranty by Silverstone Porsche

Interesting, i dont have the history of the car but I can see the turb that seem to have oil leaking is been replaced by the prvious owner...

I have to stress during daily driving this doesn't happen and the car is good... it also only happens after key off-on on after few track laps... and before key off there is 0 smoke for me...


I am still researching but the indy told me he found oil now in the vacuums lines and is replacing the diverter valves, jumping to turbo replacement is a big step especially as i am not convinced it does look like a turbo issue but more like something wired sucking the oil out during start after spirted driving, may it needs more than one cooldown lap?

Failed turbo imo would be smoking constantly, not just after first restart?

 

[widrybu]

You probably know by now these cars have a history of failing turbos. I had similar circumstances to you , my car smoked on track and was black flagged after first lap! Check my story on pistonheads ( polome ) for sordid tale. Good luck as these are great cars when driving well.