I'me fairly new to this platform and I haven't seen any discussion of this on this forum.

At what point is it necessary to upgrade internals in the 991 TT?
Seems people are making up to 700-800 at the wheels with stock rods and Pistons now. Has any one pushed past this with factory internals?

 

Horsepower isn't usually the thing that causes damage, torque is.

You may see 700-800hp, but you'll notice that the tuners in those cases are keeping tq minimized at around 600 or so. Mid 600's is probably the sweet spot for tq. That's what keeps the engine in one piece at those power levels.

 

Tom

Thanks. So are people actually blowing things up beyond these levels? Does anyone know where it's advised to do preemptive work and replace internals?

 

As far as I know, no one has damaged the internals of an 991 Turbo engine yet. But I don't really have my finger on the pulse of every car out there. I know there's been a few blown turbos here and there, but as far as I know, no engines have gone kaput yet lol. But we do know a lot about what these engines can handle because of experience with the 997.1 and 997.2 platforms.

You'll get a different answer to the second part of your question depending on who you ask. In my opinion, pushing anywhere beyond 650-675 TQ at the wheels with a VTG turbo is just enough to leave you a little bit of a safety net, but much more beyond that would require an engine build. If you were using a non-VTG and could ramp up the tq nice and slowly, you might be able to squeeze out a little bit more.

 

Check this out from last year Josh! We are pushing 750-800tq at the crank with no issues. Some a bit more too. The PDK clutches are the fuse here and that solution is very close to completion. After extensive testing of internals and real world data we feel the motor is good for 900+. Compared to the Metzger that has been pushed to 800 for years with controlled tq.

https://www.6speedonline.com/forums/...cting-rod.html

 

Tom and Sam
Thanks for the info.
Sam, thanks for the link! Reading now. Lot's of great info.

 

I am aware of one recent blown engine with a tune in the NY area but not the details. Given how many of our cars are tuned and no widespread blown engines it was probably a fluke/manufacturing defect with the engine.

 

Cheers Josh. We are looking at approximately 20% more strength! Very exciting and comforting!

 

My recollection is that Cobb did extensive tests of the internals which showed the engine could take a lot more power before needing a build

 

Hi I've bent a rod on my 2010 turbo s .Just waiting for engine to be stripped

 

Sorry to hear that. That sucks. How many miles on engine and tuned?

 

Cars done about 57000 k about 10000k of that on tune

 

Thanks for the 411.

 

Concerning the 991 turbo S, the internals are just as good as the best aftermarket parts that are available. Well, to be exact, just slightly below the best which means it's a waste of time to pay all that money for a build. Please review the strength test buy AMS and you will see how good they are. The issue is the PDK.

Jeff

 

I read the AMS review, part 1. The rods look very good. Is there anything on the pistons and other parts out there?