Agreed 100% with the fellas who are being “idiotic” about the height change. The old 911 front suspension is very sensitive to height change. If you don’t reset the toe when you’ve futzed with the height, whatever was your previous toe setting has changed by a lot
The above is a graph from Porsche (provided by Bill Verburg many many years ago) that shows how the toe changes with front suspension movement. The vertical is height, the horizontal is toe. Trust me, the graph shows a substantial change in toe as the suspension moves. So when you change the static height of the car, you’re then making that toe change tht much more when the suspension goes up and down. This may not matter much to folks just driving around on the street, as they will never really notice it from a feel standpoint. But eventually your tires will show it to you.
In a more telling situation, here’s a case in point of what it does at a faster pace. My buddy decided he didn’t like how his car looked and lowered the front to his visual liking. Next time we were at a track day event, he complained how his car was understeering like crazy. He’s a guy who was always faster than me but not today. I asked him what do you think changed, like are your track tires toasted? He says, well I lowered the front end. I said oh well there you go your toe is all out of whack now, you’re welcome. Reset the toe and all was back to normal, unfortunately for me…..
Lastly, a long long time ago I rebuilt the suspension on my ‘87 911 3.2 and set the heights visually, then got it aligned. It seemed to drive fine, had fun with it at the track days. But man on corner exit in some corners It would lose grip and spin the inside tire quite a bit (open differential, not a limited slip) and I just thought that was because of the open diff. I drove it with that condition for a long time and just blindly assumed that’s just how it is. NOPE.
A track day friend asked another friend (accomplished 911 racecar guy) if he could weigh his ‘79 SC on his corner weighting scales because he was simply curious how much it weighed. So we made a get-together out of it. I weighed my ‘87 Carrera to see how much fatter it was than the SC. What we also found was my right rear was about 300 lbs light. That’s a LOT. The car was basically like a table with a short right rear leg
Point of sharing this is that I put a few turns of raising the left front suspension to see what it would do- transfer some weight to the right rear. What I should have done is work on the right rear but that’s more involved…... Shame on me but whatever.
Wow what a difference next time on the track, even though I had compromised the toe. After that discovery, we set the corner weights to something decent (can’t get the weights spot-on ideal with the original Porsche fixed length sway bar links) and I got a full alignment with more aggressive camber settings. The car was transformed. It drove SO much better and felt much more stable My confidence also went way up because the car was easier to drive and my lap times were faster.
^^^ Take the above for whatever it’s worth. Just one dipshyt’s experience, shared on the internet