used twin turbos

[Rodger Goldman]

Buying a used twin turbo. I would appreciate advice on the subject. I've owned a 928 and a Carrera, but have no experience with turbos. I put 90,000 plus miles on both my cars, so I'm surprised to see turbos for sale with very low miles. What does this mean?

[MVZ944T]

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[jrgordonsenior]

993 or 996??? Regardless of which, get a complete PPI at from a reputable Porsche shop, preferably not a dealer....Make sure they leak down the engine at TDC, it's the best indicator of condition...

If the low mileage question is directed towards 993's, I believe the answer lies in the collector mentality. They are incredible machines the exemplify Porsche's best foot forward 10 years ago. That they still command approx. 70% (+-) of their original sticker price is telling. Just remember these cars are 9 or 10 years old now and things will start wearing out.

[TheStig]

993 and 996 Turbos from what I hear have a tendency to go through clutches in about 40,000-60,000 miles. I am being conservative on the highest mileage for durability since I know of a Rennlister who has finally changed the clutch on his 993TT after about 60,000 miles. He never raced the car.

I'm not sure if this applies to the 993 Turbo or not since Porsche may have used different mechanical parts compared to the NA 993; but, be on the lookout for a check engine light. This can indicate a premature valve guide issue around the 50,000-75,000 mile range. I have heard of owners removing the engine belly pans to allow more air to circulate around the undercarriage of the motor. This in-turn helps keep the engine a little cooler and may extend valve guide life.

As far as the 996 Turbo goes, I have only heard of clutch failures and diverter (blow-off) valve failures because the original Porsche units were made out of plastic. I have seen many aftermarket suppliers out there make them out of billet aluminum.

Keep an eye out on books and records. Learn about the previous owner's driving habits. Also, not to be too prejudice, but find out if the car is a lease return or not. Some people in this world have the tendency to destroy what really isn't theirs, and give it right back to the dealer or to another car lot that isn't knowledgeable about the car. For a 911 Turbo, this can and will be catastrophic.

There are lots of 993TT and 996TT owners in the club. I'm sure they would be more than happy to share some tips, ideas, and suggestions prior to buying your 911 Turbo.

Good Luck!

[MVZ944T]

If you are interested in a very pristine 79 Turbo that is mechanically very good condition (ie, spent a lot of money getting it that way), let me know. It is up for sale so I can fund my new race car. (31k)