TRAKCAR

After Sebring on Sunday, I am thinking that if I don't find big grip with new MPSC2 (I was on very old Dunlops) I may go back to less front camber, more toe in and raise tha car back up to where Porsche put it after factory drop off. (Just 2 turns up front and one turn up rear).
It felt I couldn't stop the car, not super stable and huge understeer on the way out of the corners.

Trying to make an appointment to get my car measured.

Joe731

On this big adjustments for a car that see track time bulletin, if I bring the car to the dealer I bought it from, who pays for the work and any idea how much it costs?

TRAKCAR

I'm trying to sort that out with my dealer as well.

Seems like I have plenty of front camber for Dunlops..
I was wondering where all the understeer came from and why it wouldn't stop...

I only ran the tires 29-33 hot on track and street.

marcvv

My SA told me that the regional Porsche service tech advisor said that rubbing on the front fender wheel wells is "normal" and there is no recommended fix or need to address it.

Thoughts?

Seth Thomas

Did the car feel unsupported on the front end? I ask because the tire pressures at 29 sound very low for a DOT tire and at that low I could see the front tires compressing too much causing a lack of grip in the brake zones. 32 is even a little low for a DOT tire but should be better. In my RS I always shoot for 35 hot front and rear. Anything over 35 and the car squirms for grip. Anything under it feels like the car is supported and lacks control.

Mika911

Porsche's recommended pressures are 29f/33r, so 35 seems a bit high. I presume Trakcar is just pointing out the fact that his tyres are worn being the cause of the issue.

I just replaced my rears at 5000km (due to cording) of which about 1500km track and drove the fronts for another 1000km and 500km on track, at which point they felt like wood and the car was understeering everywhere. In the end it's still a 911.

The rubbing does seem to have stopped at this mileage, as Porsche suggests. Running the rears full stiff seems to have addressed the cording as well.

Kobalt

I guess it is a guarantee job so it should be free.

I will know in a couple of days.

SanDiegoDavid

Dealer is doing the bulletin work for the rubbing. Question for Trackcar and others: What is the conversion of 1.5 mm toe in for the rears to degrees? My service advisor wants to get the rear toe correct.

TRAKCAR

Sorry, don't know the conversion.

I taped all rubbing area's, we put the car on the lift for close inspection and no more rubbing without rolling fenders.

SanDiegoDavid

Good to hear, I'm doing everything but the rolling.

This is a conversion chart for millimeters to degrees. Looks like 1.5 mm converts to only 10', so 1/6 degree. Does that sound right? I have double that on my GT3 rear.

TRAKCAR

I used to run 2mm ea side on my 997's but this seems to work.

GTEE3

Anyone have rubbing right on the PDI inspection/test drive at the dealer?
Resolution?
thx

Kobalt

Sounds really weird.

Where is it rubbing?

I guess they most do a proper setup of the car.

GTEE3

^Thanks Kobalt,
I am not getting detailed info...long story.
But I believe new front fender liners have been received.
I am pressing for the cause of the problem. If it is a bad alignment, fix it.
Any other thoughts?

Kobalt

I needed to drive fast in tough compressions to get rubbing. The rubbing in the front in my case was just where the side indicators are. You might have rubbing somewhere else...

MHO is that the RS might rub on original setup when driven hard, not otherwise.