Who has successfully turboed a 996 without reliabilty issues????

Want to twin turbo my 996 and have gotten mixed reviews of the engines ability to hold up under boost due to a weak crankcase...

Cameron: IMHO, the lack of response here speaks volumes,..... Not a good idea. I've seen the insides of these engines and compared them to their predecessors. I would not do any forced induction system on these things. If you want that kind of power, I would strongly suggest the purchase of a 996 TT.

Cameron, I was at a German Autofest meet a few months ago in Ventura and at one of the company booths there was an aftermarket twin turbo 996...alas since I'm 928S4 owner I did not collect their business card. I did engage in a bried conversation with one of the company reps. So what I do recall is this. The actual car they had sitting there with bumper removed looked great as far as workmanship. Upon further questioning however, the car had not really been tested so they really had no idea what kind of longevity the engine might have. The components themselves looked solid and sturdy but they did not change any of the innards to Steve's warning may well be on point. Seemed to me it was basically theory. (If we bolt this on, we should get this...kind of thing) Anyway, I don't know how much it will help but it was a California company doing the conversions. K

Although I think Steve MAY be right, and for the reasons he gives later in his post, I don't think the lack of response here says anything. The number of these conversions done in the entire country has been very small. As a matter of fact, I bet if you asked 'who has had problems with a 996 TT conversion?', you'd also get the same lack of response. While I think your approach of asking the question is good, you might also try approaching folks like Gemballa (who have been doing this to 996's for the longest), and some others, and asking for referrals of happy customers who have had their turbos for over a year. Just a thought... please post what you find out, if anything, as I've been considering this myself.

Provided you have adequate funds how about switching the whole engine with one from a 996 turbo? And while you're at it, slap on some bigger turbos and a monster intercooler and some race pistons/rings etc etc for some monster hp. I'm guessing this will set you back anywhere between 20-50 thousand bucks. later, amir

I have been looking into converting my 1999 996 C4 Cab to TT. I have spoken with Gemballa and EVO. I think both have been doing this conversion about 2-3 times. Gemballa charges about 25K for the conversion. They will take the engine out rewiring the car, and rebuilt the engine for this price. Evo has 2 levels of charge. One for similar work to Gemballa and one of lesser price for just add on stuffs to the existing engine without rebuilding it. This service is for around 20K. It seems like Gemballa has the best conversion...but I donot know the reliability issue since this is new stuffs. Please post what you find out...

I read an article in a car rag that backs up what Steve posted. Porsche used finite element analysis to design the 996 engine to be built as cheaply as possible. It said there was not really the "over-engineering" as in the past and it likely would not withstand much in the way of a horsepower boost.