Hi, weight aside, what are the inherent suspension advantages of the GT3 versus the 997.2 Turbo S? Also not including adjustable sways/thickness of sways, and the fact GT3 comes with ride adjustable coilovers.

I'm more talking about things like the links, arms, geometry etc. Things that can't just be overcome with putting on some coilovers on the TurboS. I'm curious to know. I've seen some pictures where the GT3 coilover/upright is angled more (more caster?) versus the Turbo S. I'm not sure how all that works and how that all affects handling.

 

Here is a good read for you albeit this is for 997.1, it still applies. The turbo/s has standard carerra bits.

http://www.elephantracing.com/tool-b...n-overview.htm

 

Diff between stock 997.2 GT3 and stock 997.2 Turbo/S:

Front lower control arms- different
Front thrust arms- same
Front subframe- same
Front uprights- different
Front struts- different

Rear lower control arms- same (different for RS and 4.0 version)
Rear thrust arms- same
Rear upper arms(aka dog bones)- same
Rear uprights- same (different for 4.0 version)
Rear subframes different
Rear toe links- same (different for 4.0 version)
Rear shocks- different

 

Tom,

The subframes have solid bushings as well compared to rubber for the rest.

 

Yep. That's the only difference, rubber vs metal bushings. A very popular mod that we do for non-GT cars is replace rubber rear subframe bushings with metal to eliminate slight movement of the rear suspension independent from the chassis. The metal bushings are thinner by around 10mm so the rear suspension pick up points are raised which is good for lower ride heights. Burning out the rubber bushings with a touch is messy work but a worthy mod for track cars.

 

So how do struts and uprights affect handling?

Things like bushings are pretty clear what they do.

 

996 turbo vs GT3 997 is quite close.

 

GT3-variant front struts and rear shocks have shorter stroke(less travel). The front uprights have raised axle centerline and matching height for outter tie rod connection. And GT3(and C2) front uprights puts the struts at a more straight position, whereas Turbo/C4 front uprights puts the front strut at more angle in order to accommodate front driveshafts.