Had the 911 up to 115 MPH

[CellN12345]

Had the 911 up to 115MPH on a deserted Highway (completely deserted) and got to 155 at which point i let up on the the throttle. Immediatlt the the steerong wheel shook rapidly and very strongly. I tapped the gas and the shaking stopped until I let up on the gas again and the MPH went below 85. I took it to a dealer in the town I was working in and he said the tires are perfect at 80% tread and wheel balance is right in target. Anyone have this issue?

[CellN12345]

My original post was slightly incorrect in the MPH. I had the car at 115 not 155.

Had the 911 up to 115MPH on a deserted Highway (completely deserted) and got to 115 at which point i let up on the the throttle. Immediatley the the steering wheel shook rapidly and very strongly. I tapped the gas and the shaking stopped until I let up on the gas again and the MPH went below 85. I took it to a dealer in the town I was working in and he said the tires are perfect at 80% tread and wheel balance is right in target. Anyone have this issue?

[logray]

Aside from being completely illegal on public roads in the US...

The front end of this car tends to lift at higher speeds, since most of the weight on the 911 is in the back.

If a little forward rake is dialed in, or add a splitter, or upgraded front bumper with rear wing it can help reduce the affect.

Still though, at 100mph + my car has not exhibited these problems, I would make sure your tire pressures are proper, wheels are balanced, wheels mounted and torqued properly, alignment good, rotors not warped, and suspesion bushings/components are in good shape.

[CellN12345]

Thank you. West Texas is 80MPH, soon to be 85MPH Posted Speed limit, but at 11PM and a clear horizon so's not to endanger another motorist I gave it some gas..

Thank you for the advice. Someone emailed me that they tought the Cabriolet top (which was up, not down during my drive) contributed to the shaking and it is a known issue with carreras from 99-05. Never heard of that before and will just keep it below 100 for safety going forward.

Cheers.

[wvicary]

Have the suspension bushings carefully inspected.

[phillipj]

Doesn't sound right.. I used to drive my 996 at +125 mph with no issues...But Logray is correct.. These cars do get "light" in the front end at speed.