Although I was initially tempted to tack this on one of the existing geometry/Center Gravity threads on the 997 board, on reflection it is very much a 991 issue hence this new topic.
By the time I get back from LWOTY+ the car will have around 3-4000 miles on the clock and therefore it will be pretty much an ideal time to get the geometry checked/tuned.
But here's the thing. PDCC to a small extent but rear wheel steer to a greater extent must challenge conventional thinking about toe, camber, ride height and the like.
Take any slow left bend. Presumably, with rear wheel steer acting in the opposite direction to the front, the LH rear wheel turns to the right and adds the equivalent of more toe in and the RH rear wheel moves to toe out. For now I assume caster and camber aren't affected.
Then on a fast left hand bend when the rear mirrors the front the LH rear moves to toe out and the RH rear to more toe in.
This simple proposition if correct would seem to make moving away from factory settings a tricky business.
I've booked in with Chris for end of May but whether there will be any adjustments made or we simply have a bit of a nose round underneath the car remains to be seen.
In the meantime if anyone can shed any light on this or point me in the direction of technical papers or factory setting it would be much appreciated.
By the time I get back from LWOTY+ the car will have around 3-4000 miles on the clock and therefore it will be pretty much an ideal time to get the geometry checked/tuned.
But here's the thing. PDCC to a small extent but rear wheel steer to a greater extent must challenge conventional thinking about toe, camber, ride height and the like.
Take any slow left bend. Presumably, with rear wheel steer acting in the opposite direction to the front, the LH rear wheel turns to the right and adds the equivalent of more toe in and the RH rear wheel moves to toe out. For now I assume caster and camber aren't affected.
Then on a fast left hand bend when the rear mirrors the front the LH rear moves to toe out and the RH rear to more toe in.
This simple proposition if correct would seem to make moving away from factory settings a tricky business.
I've booked in with Chris for end of May but whether there will be any adjustments made or we simply have a bit of a nose round underneath the car remains to be seen.
In the meantime if anyone can shed any light on this or point me in the direction of technical papers or factory setting it would be much appreciated.
