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No black cloud of smoke. There are only two things that are different. First on a acceleration run I banged the the rev limiter pretty hard in first gear one time (really need to extend first). This caused a check engine code to light. I disconnected the battery for a half hour and reconnected. The light went away. I think this may have started the problems. Second, I changed the stock plugs to the Iridium plugs. They are a little shorter, have very thin core electrode and have only one electrode ground instead of two.
I think your first guess is probably it. After the shutter, the boost can go as high as 1.5 bar (the TB is shutting). It is extremely violent at first.
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It is possible your TB limit was only moved up, not eliminated. In that case you may have caught the turbos on a good day and overshot for a second and clipping the TB limit. Get them to remove it or push it to the moon. When it does happen you think the motor is going to drop on the ground. It does get your attention.
Where are you sending your car? And do you have a deliver date on the Bugatti, I thought they were delayed which is why the President of Bugatti got fired?
Your question is good, but there are a lot of factors to consider
to get an answer. If you mean "How much power can I tune
for, and expect the motor to last as long as stock, for my
typical street driving" then the answer is different than if you
mean "How much power can I tune for so I can win all my nightly
drag races at the strip with my car running slicks, and still tow my
supply trailer to the track?
Stephen of ImagineAuto has a well-pumped 996tt, which he
runs hard and often. He seems confident of the car's durability.
Very true, I am more interested in how much power the internals can take and still have some life. Don't care about dragging the car every weekend. In fact after I do stage 5 it will go to the drapstrip once and then I will be done. I prefer running road courses and that is what the car is made to do.
It all depends on how much road-coursing you'll do. Track
events are taxing on any car. Even a stock Porsche will
get tired much sooner if it gets run hard on a regular basis.
Brakes will become consumables, and rotors too. Depending
on the power, the clutch may need strengthening. Watch your
tach and temps: keep off the rev-limiter and your motor's lifespan
will be as long as one would expect... I would install an oil cooler
for the transmission for hard track use.
Joe
A few weeks ago I installed a heat reflectant cloth on my Europipe 85 mm mufflers. I was just warned by Stef that the heat build up could damage the mufflers baffles. I did not consult with him in advance. In addition he said the higher temperature air moves faster and could result in more backpressure in the mufflers. I am removing the cloth from the mufflers as Europipe has suggested.
Torque not hp is what usually bends rods. HP can cause problems in the higher rpm ranges. I understand the stock motor is somewhat safe to 7300 rpm's. I understand the 993 turbo rods started to encounter problems after 600 rwt. I have exceed that, but a little nervous about the test of time with the stock rods.
We are now taking a different approach. We are droping the torque to approximately 600 rwt, however instead of just peaking at about 4400 rpm's we are attempting to carry the 600 ft lbs through to redline. In other words a flatline 600 ft. lbs. of torque from approx. 3800 through 6800 rpm range.
Originally posted by buddyg Very true, I am more interested in how much power the internals can take and still have some life. Don't care about dragging the car every weekend. In fact after I do stage 5 it will go to the drapstrip once and then I will be done. I prefer running road courses and that is what the car is made to do.
Thanks!
Buddy. I would contact a shop that builds Porsche racing engines and ask them what the expected life of your engine is given the mods you have planned and the amount of time you expect to spend on the road course.
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"Doc"
2005 Turbo S Cab, Seal Gray/Black
2005 Cayenne Turbo, Basalt/Tan
2004 Cayenne Turbo, Titanium Metallic/Black
Thank God for the global economy, I mean tuners. 
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