mjposner

My Turbo feels a lot stiffer and transmit more road feel over less than flat roads, is this normal? Its a cab so I know that this is somewhat expected, as my prior 996 was a coupe, but my non-turbo 997 wasn't this way either. Car has 60k miles. Car has Sumitomo HTRZ5, a tire I have never used (big Pilot 4s fan). Could this be the culprit?
Also, all original suspension based on prior owner's service history.

mffarrell

The turbo suspension is stiffer/firmer than a 996. I have both a 03 turbo and 03 996. I am in the process of replacing the suspension on both cars. They are both low mileage cars, 35K miles, but the suspension is shot after 20 years..

Dock

What tire pressures are you running?

wross996tt

From supercars.net:
The bodyshell of the Porsche 911 Turbo Cabriolet is based on the body structure of the Coupé. The main differences are specific reinforcements and strengthening body elements wherever required, serving to replace the stabilizing effect of the fixed roof. To increase body stiffness, the body-in-white of the Cabriolet comes with reinforced side-sills featuring body panels and elements doubled in thickness, additional junction plates and so-called shaft reinforcements behind the B-pillar. Indeed, this is the first Porsche sports car to use ultra-strong DP600 steel at this point in the interest of maximum strength and stiffness. A further feature is that the shaft reinforcements are not only welded, but also bonded, this combination of joining technologies and the additional reinforcement provided by the bond serving to take up energy even more consistently in a collision. Benefitting from the sum total of these body modifications, the bodyshell of the new 911 Turbo Cabriolets one of the stiffest open-air structures within the 911 model series, like the open-air version of the Carrera 4S recently introduced into the market.

Capt. Obvious

The all wheel drive body tub is stiffer than the coupe tub as well, which I understand is the reason they used it for the GT3.

mjposner

Going to check air pressure.

mjposner

Fronts were 36, rears were 41/42 which is what the manual says.

Carlo_Carrera

You are running max pressures. Maybe try 33 front, 38 rear.

mjposner

33 front, 38 rear. seemed to help, less jittery over uneven road.

Dock

Chris996

Porsche H&R Sport Spring Set - Porsche 996 Turbo

World of difference! These are progressive springs . Ride much smoother than stock.

Porsche Shock Absorber - Bilstein

even better.