Track alignment

[maytag]

Originally Posted by jmitro

I'm confused about which printout is which. it appears that last year the rear toe was negative (toe out) while this year is positive (toe in). rear toe OUT would make the car feel pretty unstable, like the ass end wants to pass the front



My home grown method of measuring toe is to use Longacre toe plates to measure total toe, then a laser pointing on a reference point from the rear wheel towards the front (both sides) to make sure the thrust angle is zero

I should've widened the view on the '20 print, so it'd capture the date at the top left, the way the '19 has.

No mistake that last year it was stable as a rock, and, while I haven't had this setup to the track yet, at 90mph on the highway, I'm white-knuckled.

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[husker boxster]

My race alignment has the fronts at .05 deg toe in and .1 deg toe out on rears.

Not sure how your mm compare to degrees. If mm & deg are an apples-to-apples legit comparison, it seems you have a lot of toe out on your rears.

[maytag]

Originally Posted by husker boxster

My race alignment has the fronts at .05 deg toe in and .1 deg toe out on rears.



Not sure how your mm compare to degrees. If mm & deg are an apples-to-apples legit comparison, it seems you have a lot of toe out on your rears.

So husker is running a little toe-out.
MaxD runs zero.
All the rest of y'all are telling me you run toe-in.

I'm in a real head scratcher here.

One thing I THINK I'm still feeling, (I haven't been able to spend enough time in the car yet to be sure it's not my imagination) is a lift of the right-rear when I step on the gas, accompanied by a mild wandering-to-the-right in the front. I wonder if this could be explained with the new tarret bars? I've got their gt3 bar in front, set at half-soft, and their bar in the rear set at full-soft.

But I'm still inclined to blame the alignment.

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[Qingdao]

Originally Posted by maytag

But I'm still inclined to blame the alignment.

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I agree. Regardless of what is holding the vehicle up the part that grabs the road is angled differently.

I'd try restoring your previous alignment settings, as best you can, first then go hunt other issues if the problem persists.


Did the new parts change anything like track or SAI or offset?

[husker boxster]

Let me preface this by saying I'm not an alignment expert and I didn't stay at a Holiday Inn, but the explanation I was given as to why to have a touch of toe out on the rear:

When the rear unloads under heavy braking, a touch of toe out becomes neutral as weight is lifted off the rear. This is desirable when entering corners vs toe in.

It was Porsche of Omaha's service mgr who told me that, they've done many 'racing' alignments, and seem to know what they're doing with the proper alignment figures. I have no reason to doubt them, but once again, I'm not an expert. At the time I had my alignment, I had my CSS in to add GT3 LCAs on the front, Tarett monoballs on all 4 corners, and Tarett thrust arm bushings in the LCAs. I also have Tarett toe arms on the rear. When the tech got done with all the changes and the race alignment, he told the serv mgr that all Caymans should be set up this way, as he thought it handled on rails when he took it out for a test drive.