I usually just measure from the fender to the center of the wheel but have read that you should measure from the subframe to the ground. How the hell are you guys able to even reach under there? Or am I just missing something?

 

I keep it simple and just measure from the garage floor to the fender above the top of the tire. Never heard of the subframe method but I'm sure someone has done it. Problem as I see it is that it's an unusual way of doing it so what good is it if you don't have any other references using the same method?

 

Fenders could easily bend, distort, damage or from body work, where subframe will be less prone to bending/damage. FYI Put a white paint dot(s) on the frame as a reference point, and future measurements will be consistently repeatable and more precise.

 

Cool but how am I supposed to reach the subframe...

 

I have always, and will continue to always, measure from the garage floor to the fender well lip edge centered over the center of the rim. Never had any issues measuring this way and it's easy.

 

Yep...you need a small person to crawl under there
If you are using it for comparing to OE or comparing it to Porsche specs on other models......or for specifying rake (also a Porsche spec).....in the front it's the bolt head and the back it's the flat spot on the rear sub frame. .
More specifically......the front is the distance from road surface in mm to the lower edge of hex-head, that's the bolt of tension strut screw(cross member screw) connection to body....and the rear it's distance from road surface in mm to locating bore in rear axle side-section (between the toe & camber eccentrics).
In the end everything is relative, one car to another. Not that many people actually measure it correctly anyway. My shop does.
Good luck

 

Seems like such a hassle imo. I might try driving over my ramps, measure and miinus the ramp height.

 

Cool....please share if you would.