I know the 997 has a wider track, but I'm not sure if it's in the control arms or spindle.

Can someone correct the title to interchangeable?

Thanks, Steve

 

I'd like to find out exactly where the differences in the track come from as well. Subframes?

From what I've read, LCAs are all the same dimension-wise with the exception of the Cup inner bearings which are approx. 17mm wider than the standard GT2/3 inner bearings. But even the 997 Cup outer sections are the same length as the 996 GT3's.

The 997 GT3 outer sections are more expensive than the 996 GT3 pieces too. Why? Cup outers have replacable ball joints, but the 996 and 7 GT3 pieces are supposedly the same except for the castings.

 

If no one knows, I'll try to get some measurements.

 

I would imagine they are. I run the PMNA 997RSR LCAs. Don't see why the street arms wouldn't work. PMNA sells both the short and "long" inner monoball joints. I run the short ones in the rear. If you need more that 3 deg off camber, you can run the short mono ***** with a bunch of shims or the long ones without shims. I run the fronts with 13mm of shims per side for -3.5 camber and the rears with a single 1mm shim for for -2.5 camber.

 

Is it even possible to run long inner bearings in the rear without encountering CV joint problems?

With my standard offset/size 7GT2 wheels and tires, I have 20+mm to the fender lip on front and rear at stock (street) camber settings. I would be really interested in finding out where the track width differences between the 6 and 7 come from.

 

Below is a picture of some 996 and 996 lower control arms. Not sure what version, but you can see the 997 versions are not longer than the 996 version. The 996 versions have RF and LF written on them. My guess is the wheel carrier is different.

Later, Steve

 

The wheel carriers are def different. But I don't think that the track width difference is in the carriers.

Pwdrhound might be able to add some insight here. He's running 997 hubs, maybe he's looked at the carriers as well.

There is also a guy running a wild pushrod suspension on a 996. He is planning on swapping to 2010> 7GT2/3RS front uprights. The conversion is being done at bbi. Might give them a call and see what I can find out.

I am going to guess that the difference is in the subframes (which are different too).

 

Subframes and wheel carriers are different on the 996 and 997. Hubs are the same. Frankly I never looked at the difference in the rear track width, didn't even know there was one. I'm assuming the 997 is a little wider then?

 

FYI the track on the stock 996 turbo is 57.7" front & 59.9" rear
The track on the stock 997 turbo is 58.7" front & 60.9" rear

Basically 1" (25.4mm) wider front and rear. 0.5" (12.7mm) per side.

Assuming that this is measured from the center of the tire, the offset of the wheels also has an affect.

The 996 turbo offsets are +50mm front and +45mm rear
The 997 turbo offsets are +55mm front and +50mm rear

Given this, the wheel mounting surface is 17.7mm further outward on the 997 (0.7") versus the 997.

Assuming my math is correct.
25.4mm/2=12.7mm per side
12.7mm per side + 5mm more offset = 17.7mm per side

Later, Steve