X50 were the ICs from the 996GT2...their design are on the standard 997 turbo now.

The suspension's damper rates are electronically controlled.

PSM = stability management...less intrusive on the 997

PCCB = carbon ceramic brakes - second generation much improved over 1st generation.

 

o.k thanks for clearing that up.

Wild guess here -

do people dump the suspension and replace with good set of coil overs?

pccb- sound expensive! Dump these for a big set of brembos maybe or do we keep them?

PSM- tell me more, how does it work?

 

Most 996TT owners do on here at least. The GT2 comes with coil-overs. Some keep them, some don't (I'm keeping mine).

Very few 996TTs have PCCBs. They're standard on the GT2 and Turbo S' and come a an option on some of the others. The only people that I know that swap them are people that track their cars and don;t want to risk damaging them. They cost $15k for a new set.

It's stability management. It monitors the ABS sensors, RPM, throttle position (via E-Gas), gear selection, lateral acceleration, yaw, and
steering wheel position...all in order to detect oversteer and
understeer.

 

and what does it do to correct? send more power to differnt wheels or brake certain wheels?

 

When it senses oversteer, it'll apply the brake on the outer front wheel in a turn, reducing rotation of the car. When it senses understeer, it applies the brake on the inner rear wheel, increasing rotation of the car.

Also, if traction is low, PSM uses engine braking (EDC – engine drag torque control) to slow the car down. It calculates the amount of available traction by measuring wheel speeds at all four corners.

 

What happens when the system goes wrong and brakes 1 of the wheels at speed in a straight line?

 

PSM is extremely sensible to failures...PSM/ABS light might lit and the system goes off if for any reason something is not right for the ECU of the PSM/ABS...There isnt even one case where PSM acted wrong and caused damage...996TT common failure is mass air flow and when it happens,PSM and ABS are off as well...