ottodawg

Test drove a 15 C2S Cab 16k miles a few weeks ago, and when pulling out of the lot the rear end make what I'd describe as a clunk. Best way I could describe it, it was like driving a vehicle with a locking rear diff, and the sound/feeling it makes when it slips. The vehicle was cold, and it was a pretty cold day (~39f). Salesman said it was normal, it's the torque vectoring. I wasn't able to get it to do it again for the rest of the drive ~20 minutes.

Question, is this "normal" for a PTV equipped vehicle? TIA

shammerman

I had the same (or similar) sound with mine. Ended up being the sway bar bushing. I it happened going over very uneven pavement or bumps like the parking lot ones meant to slow traffic. See if you can get it to clunk again.

ottodawg

Thanks! Yea, it was really strange, you could feel it through the whole car. I've never driven a PTV car so wasn't sure if it was "normal". Do the rear diffs lock on these cars and maybe let go when 1st driven? That's kinda what it felt like. It definitely surprised me.

shammerman

Mine was replaced under warranty and they did both sides at no cost. I would not think what you heard is normal soI would continue to investigate.

ottodawg

Good to know. The salesman (non-Porsche) made it seem like it was absolutely normal in a PTV car. Didn't seem all that normal to me.

X51

Not a normal PTV sound. Agree with shammerman - likely a bushing or suspension component.

ottodawg

This was literally like I'd driven over a curb. I honestly thought the rear end might have kicked out a little.

SoCal C2S

Umm....no. The PDK can be a bit clunky when cold but it doesn’t last long. I just did a PDK fluid and calibration and even the cold starts don’t yield clunks anymore.

ottodawg

No, I have a Macan, this wasn't a PDK clunk. it was felt thru the whole car. Like I mentioned, it was like a locked differential let loose. I just couldn't imagine this was "normal".