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Turbo S loss of power

rholyoake

rholyoake

New member
Just returned from a trip to Germany to drive the Route 500 near Baden Baden (would highly recommend by the way) and had strange loss of boost pressure when on autobahns over 120mph. Car had anyway been making a "not usual" deep, exhaust note on way over when trundling through France, then when I got into Germany it would accelerate (with some jerkiness and unusual gear changing) to about 120'ish then the boost would go completely to around <0.1bar but you could still get to about 140mph in a couple of miles (extremely embarrassing after all the people you've just overtaken then come past you). If you stopped and restarted you got the boost back, but it would go again when up to speed. No warning lights, strange noises or anything other peculiar happening. Strangely, the day we were blatting hard up and down Route 500 it was absolutely perfect and no issue - but back on the Autobahn today same thing again (which put paid to seeing how fast it would go). It fet like it was on bad fuel or someone had restricted it. I've read on the forum about sticking parts in the VTG (?) assembly or something and the fix being WD40. Have it booked in to OPC to check out, but for now its one sick car and disappointed owner. Friends in their Bentleys and AMGs were naturally amused [:mad:]. Anyone had anything similar?
Rob
 
I've had what you described in a BMW 335i which went into a "limp" home kind of mode, would still get up to speed just very slowly. Parking, turning off the car, leaving it for 5 mins solved the issue but it basically went into a mode where it bypassed the turbos, maybe something similar is happening on yours...in the end it turns out my turbos had gone and needed to be replaced (just as I was getting my 997, luckily it was under warranty!). It did show an engine failure light though so I'm surprised yours doesn't show anything, seems like an odd failure to get no warning lights... not very helpful I know, but I have the gut feel it's something to do with your turbos...

 
It sounds to me like a vacuum line or a slight weep on a boost pipe.Something that only opens up when the car is hot. So probs some thing rubber or plastic.Any electronic type problems would happen all the time. But if the engine is running sustained boost for a period of time ie running on autobahn at 120 mph the a small weep will get bigger and bleed boost until you slow down and it closes up. Then a sudden short burst of boost won't open the leek in the same way a more sustained push will.
 
Thanks dirkjandevos and colin944 for your thoughts. I will update once the OPC have sorted next week. Just such an anti-climax when you been waiting all year for the Autobahn! I guess it may have been there for a long time, but as I'm not doing Autobahn speeds on UK motorways I wouldn't have known. I'm interested to learn how they will "test"any fix - rolling road? or is to just a question of plugging in a clever computer to tell them?
 
Chaps - just to close this one down and report that it was indeed the turbo wastegate actuators sticking. This had been mentioned by various members on previous posts such as:

http://www.porscheclubgbforum.com/tm.asp?m=566352&mpage=1&key=

....thanks for those previous posts tscaptain, garyw and others, which we're very helpful.

Seems like a genuinely simple cure to a dramatic problem, but thankful it wasn't anything serious.

Hopefully be easier for members to search for this issue if they have any issues on 997.2's.

Now, where's that Autobahn..........

Thanks

Rob
 
I'm glad it's sorted for you Rob, it does leave you surprised when the boost drops to nothing!![:eek:]
It does seem to be a re-occurring problem over time but at least it is a simple fix. [:)]
I guess with the layout of a flat 6 it does leave them open to the elements than say a V engine within the bonnet and wings.
 
Is this problem particular to the 997.2 turbochargers or has it also occurred on the 997.1 turbochargers?
 
ORIGINAL: flat6
Is this problem particular to the 997.2 turbochargers or has it also occurred on the 997.1 turbochargers?
Click to expand...
It has occurred on both- it's part of the VTG mechanism.
 
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