Question for Loren - 997 GT3 Lower Control Arms

[dariusy]

Loren,

I understand that a few wise folks have been retrofitting 997 GT3 control arms to Caymans and 987S's in order to facilitate more negative camber to improve tire wear while on track.

Do you have part numbers for these items? Is the lower control arms that only items that need replacing? I also understand that shims are involved as well to set the "range" of camber adjustability.

Any info you have would be great

Thanks

Darius

[Loren]

See the attached list.

You may need to replace any damaged nuts and or bolts from removing the old lower control arm. Everything will need to be properly torqued again.

You will need an alignment and proper selection of shims (1 mm is standard) for the amount of negative camber you want. Also, watch your wheel widths as big tires may rub with enough negative camber.

Expect very poor type life with anything more than -1 degree - this mod is really for track junkies.

I think Porsche MotorSport has a few more shims for serious racers (at their serious racer prices).

997gt3_lower_control_arms.pdf

[dariusy]

See the attached list.

You may need to replace any damaged nuts and or bolts from removing the old lower control arm. Everything will need to be properly torqued again.

You will need an alignment and proper selection of shims (1 mm is standard) for the amount of negative camber you want. Also, watch your wheel widths as big tires may rub with enough negative camber.

Expect very poor type life with anything more than -1 degree - this mod is really for track junkies.

I think Porsche MotorSport has a few more shims for serious racers (at their serious racer prices).

997gt3_lower_control_arms.pdf

Thanks a bunch. Your the best! Happy Holidays

[Brad Roberts]

We are installing these on 986's/996's also.. :) They are spendy.. The 996GT3 arms are much cheaper..

Porsche Motorsports sells us 1/2/3/5/7/10/12 mm shims.

Typical Toyo DOT stickie will need upwards of -2.5 or more depending on your experience. On the 996GT3 arms, this is upwards of 10mm worth of shims.

The real issue: we nearly NO adjust ability at the top of the strut. Max I have seen personally is about -1.3 or so. This is guranteed to wear the outside of your tires!! If you track or AutoX.. BUY GT3 arms and an assortment of shims. There is NO way around it.

B

[996noob]

We are installing these on 986's/996's also.. :) They are spendy.. The 996GT3 arms are much cheaper..

Porsche Motorsports sells us 1/2/3/5/7/10/12 mm shims.

Typical Toyo DOT stickie will need upwards of -2.5 or more depending on your experience. On the 996GT3 arms, this is upwards of 10mm worth of shims.

The real issue: we nearly NO adjust ability at the top of the strut. Max I have seen personally is about -1.3 or so. This is guranteed to wear the outside of your tires!! If you track or AutoX.. BUY GT3 arms and an assortment of shims. There is NO way around it.

B

I've ask this on another thread, hope you guys don't mind. Since the discussion is about 996GT3 arms adding negative camber, can the arms give more positive camber than stock arms? i.e. is the arm shorter than stock when there are no shims installed?