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AMN, it must be something wrong with the suspension on your P85D. So, did they replace the dampers on your car, since you now have the standard suspension?
All I want is the same suspension as the P85+ on the PxxD.
AMN, it must be something wrong with the suspension on your P85D. So, did they replace the dampers on your car, since you now have the standard suspension?
All I want is the same suspension as the P85+ on the PxxD.
We really need more numbers, since Sorka, Lola and my own are all different, so far.
This is the front left tire. It is facing down, and to the right. With the steering wheel cranked right, you should be able to get a bite on the thickness of this bar (red arrow).
Note how this is not a 'D', for lack of a drive shaft. If you measure a drive shaft, tie-rod, or sway bar drop link (vertical), you'll be getting numbers well outside of the 20-28mm range.
Anything that spans wide enough to get around the bar, perhaps a tie strap (zipped, cut, then measured) should work, and you shouldn't need to raise the car.
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Can someone with air and someone with coil please go out and measure their sway bar diameters. The front is easy. Just turn the wheels all the way to the left or right and you can reach in there in front of the wheel. The rear is harder and easier if you back your car up on service ramps.
If you don't have a caliper, then use a zip tie and tie it down around the bar. Then cut it and measure the length in mm. Then divide by 3.14 to get the diameter.
My P+ on air springs was slightly more compliant in bump then my PD and slightly less compliant when moved the P+ to coils. Roll stiffness was significantly more on the P+ as was understeer tendency although that is likely due to the PD's ability to pull the front wheels through a corner instead of the rear wheels pushing the fronts.
Late January 2015 delivery P85D
26mm front
21mm rear
both measurements were taken from the trailing run of the sway bars and assume the transverse portion of the bar is the same diameter. I'd have to throw it up on a lift to get access to the transverse torsional portion of the bar.
For those wanting to measure their sway bars as well, I was only able to measure the front sway bar by going in at the front of the wheel. I measured at the passenger wheel with steering turned completely to the right and suspension on very high. The rear sway bar is much more difficult to measure but it is feasible. I used a light so that I could clearly see the black sway bar between the spokes of the front halve of the wheel. Then I went in from below, holding my calipers upwards inserting it in the small gap between the wheel and the car. I was just able to put the calipers around the sway bar and read the result using the light.
Here's mine with the wheel turned all the way:
View attachment 93894
The blue dot is on the sway bar. There's not quite enough room for me to reach my hand between the tire and the wheel well, but if I lay on my back and reach underneath with the caliper it's easy. I can see everything through the space you see in the photo.
The rear can also be reached without jacking up, but you have to know where the sway bar is to reach it because you can't see it otherwise.
I appreciate the help, you guys.
sorka--can you just tell me:
--which tire that's a picture of
--which way the wheel is turned
--are you looking at it from in front of it or from behind it?
If I were to guess, I'd guess that's your left front wheel, turned to the left, and you're looking at it from behind, so it's not turned all the way to the left.
Spatial stuff, and anything like this is really not where my strengths lie, obviously.
But now that I have a caliper on the way...
Thanks!