991 GT3 Geo settings. Caster?
Discussion
I had my geo set to standard factory settings yesterday.
first point is that my 3k mile car was wildly out of shape!!!
and second point is that the caster is not adjustable and yet it is considerably out of tolerance.
7.30-8.30 is range and it is 9.19 and 9.29.
Thoughts please gentlemen?
first point is that my 3k mile car was wildly out of shape!!!
and second point is that the caster is not adjustable and yet it is considerably out of tolerance.
7.30-8.30 is range and it is 9.19 and 9.29.
Thoughts please gentlemen?
5517 said:
I had my geo set to standard factory settings yesterday.
first point is that my 3k mile car was wildly out of shape!!!
No big surprise there I'm afraid, contrary to what most think/expect of a new Porsche GT car, most are out of alignment and the rear ride heights too low/front to rear rake incorrect.first point is that my 3k mile car was wildly out of shape!!!
The springs will settle after the car is built. I'd to expect to have to do a ride height/geometry check six months after delivery to ensure all is correct
5517 said:
And second point is that the caster is not adjustable and yet it is considerably out of tolerance.
7.30-8.30 is range and it is 9.19 and 9.29.
Thoughts please gentlemen?
See the link to "Caster adjuster" on this page :7.30-8.30 is range and it is 9.19 and 9.29.
Thoughts please gentlemen?
http://www.elephantracing.com/suspension/controlar...
http://www.elephantracing.com/suspension/bushings/...
Looks like you'll be kissing your warranty goodbye if you fit them though......
Explanation of Cup car and 991 GT3 caster adjustment/lack of adjustment can be found here :
http://www.elephantracing.com/tool-box/specs/991/C...
Has anyone taken their 991 GT3 to Chris @ Centre Gravity to have the settings reviewed and, if appropriate, adjusted?
I'm not sure I've spent enough time with the car yet to seek a particular adjustment, but at least confirming that the settings are within specification would be helpful.
I'm not sure I've spent enough time with the car yet to seek a particular adjustment, but at least confirming that the settings are within specification would be helpful.
Slippydiff said:
Explanation of Cup car and 991 GT3 caster adjustment/lack of adjustment can be found here :
http://www.elephantracing.com/tool-box/specs/991/C...
A very interesting discussion, but I thought this comment was most telling:http://www.elephantracing.com/tool-box/specs/991/C...
"The two cars are surprisingly very similar to each other as far as the suspension goes. This generation of GT3 is closer to the Cup car than a standard Carrera; closer than previous versions of the GT3."
5517 said:
The geo settings in the drivers manual show zero toe on front which Im told is very odd.
Zero toe isn't all that unusual. I run zero front toe on all of my GT cars & it gives you great steering feedback without being too twitchy on the road. Toe out is great on a pure track car but a bit lively for road use! The more toe in you run, the more stable the car is, particularly at speed, but you lose more steering feel & the car isn't so eager to turn in. Set up according to taste.More caster will give you a stronger steering self-centre tendency & can often aid front-end grip due to increasing the camber gain when cornering. The only real downside of more caster is that you will need more steering effort to overcome the self-centreing forces. Your caster is a way past the optimum angle though, so I'd suspect that the car is running lower ride heights than it was designed to. This will have the tendency to increase the caster angle.
Ride height, and the datum points used to set them will be within the technical data accessed on line ? by the technicians. It's downloadable by the technicians, but I think they have to log on to the system using their own unique access code, once they've done so any information they download/print off has their name emblazened across it .....
Where did the above information for the toe and camber settings come from ?
Where did the above information for the toe and camber settings come from ?
sidicks said:
A very interesting discussion, but I thought this comment was most telling:
"The two cars are surprisingly very similar to each other as far as the suspension goes. This generation of GT3 is closer to the Cup car than a standard Carrera; closer than previous versions of the GT3."
Hmmmm, where to start ........"The two cars are surprisingly very similar to each other as far as the suspension goes. This generation of GT3 is closer to the Cup car than a standard Carrera; closer than previous versions of the GT3."
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