How do driveline parts hold up at those power levels?

 

Disclaimer, I’m still fairly new to this particular platform but here is what I’ve learned thus far. Others can chime in and correct me if I’m off base on anything.

Between 850-900whp is good for mid to low 9s in the quarter mile (at 145-150mph). I haven’t personally heard of any cars breaking driveline components until you get in the 8s. If you intend to do drag racing, a Wavetrac diff can be helpful above 800whp, but it’s mainly for better grip and launches so you don’t have one wheel spinning more than the other. This can unsettle the car, confuses the traction control and cost some time. I am not drag racing my car or racing competitively and I never launch it on the street. I just roll in to it and it’s more than enough thrills for me.

Stock clutches can be a weak point on 991.1 cars with upgraded turbos so Dodson clutches are recommended at this level. 991.2 hold clutches hold a little more power. Many shops upgrade to Dodson anyways on 991.2 but from my research and personal experience they don’t really need replaced on 991.2 cars until you get in to 3 sec 60-130 range. I have somewhere around 5-6 thousand miles on stock 991.2 clutches on a setup that runs high 4 60-130 on high boost and low 5s on mid-boost. There is no clutch slippage whatsoever. Stock gear sets are incredibly strong as well. There are cars with built engines making 1100+whp and still using stock gear sets so not much risk in breaking a gear in the 8-900whp range.

Beyond this power level, you need to open up and build engine go with stand alone engine management, supplementary fuel injection, new intake manifold, Wavetrac diff, Dodson clutches etc so price starts going up considerably. Stopping at 8-900 whp range IMO offers best bang for the buck and is still exceptionally reliable. Even if you don’t go this far, these cars are still beasts with simple bolt-ons and tunes and should give you many miles of trouble free motoring and smiles.

 

Stock clutches are first to go, and will start to slip. This can be mitigated with keeping torque lower in mid range. Next is rods are the weak spot. Same thing, keep torque limited in mid range.
Plenty of cars that make ~900whp as long as octane is there, and torque is limited.

 

A lot of shops are replacing clutches on 991.2 cars as it was part of their 991.1 program, but folks over in the UK found the 991.2 clutches are stronger and can hold a bit more power so threshold is a little higher on .2 cars.
https://rennlist.com/forums/991-turb...l#post18246387

Always a good idea to bring torque in smoothly in mid range though. You want to avoid a sharp elbow on the torque curve and this will keep rods happy.