I saw that. I actually replied to that one a while back. Not sure about the 997 GT3 street uprights, but the other 997 ABS sensor are significantly longer as well. So as long as the uprights are not going to space the sensors too far from the toothed ring you should be fine. I went down the path of 997 street spindles and decided to go back to 996 cup spindles because I didn't want to possibly ruin good spindles trying to modify.

Another thing to be cautious of is the 997 GT3 street spindle setup will need a new rear sway, links and the rear shocks have a clevis type mound versus a spherical bearing and offset spacers. So you will be limited to just 997 suspension options. The 997 cup rear spindles use the same shock end mounting as the 996 in the rear and does not require a different sway setup. Basically the 997 spindles are an upgraded 996 RSR spindle from the aspect of geometry. They may have changed the casting part numbers but they are essentially the same. The brake caliper bolt spacing changes based on which car they were intended for. Not sure what all is involved with the PASM suspension conversion, but sounds pretty involved. If you get it setup right it could be a nice setup though.

 

Hi VAG,
Yes, I remember your 997 C2 uprights. I actually understood Krokodil's post (second link) to mean that you can run the 997 uprights and ABS sensors on a 996 without modification - apart from possibly the plug from the sensor to the harness. I wasn't 100% sure though so I PM'd him. He hasn't gotten back to me yet. It would be very cool if the signal was the same.

One of the main reasons I have to go to 997 uprights in the rear is that I want to run the GT2 PASM shocks. I was considering machining off the lower 997mount, threading the shock body at the bottom and adding an Öhlins lower mount to the shocks so I could retain my 996 uprights, but the shock mount sits much lower on the upright in the 997 than in the 6 and the shock body is longer. And, I can get a pair of rear 997 uprights for under €500 easily (all 997 street uprights are the same, from C2 to GT2 RS, so there are plenty). And having the 997 rear sway bar mount is actually a good thing IMO. I have a set of 996 H&R sways, but I can always sell those and buy a new set. I am not convinced you can't use the 6 sway bar with 7 uprights though. We'll see.

The front upright used in the 7.2 GT2/3 is supposedly the ultimate upright for the 996/7 platform with geometry that improves turn-in - smoething I read in Porsche literature somewhere. We'll see here too...

TPC sells a stand-alone kit for the 996 PASM conversion, but I'm considering doing this myself. Not very complex, actually. But car electronics is my hobby (wow, that comes across geeky lol).

 

The issue you will encounter with the rear sway 996 vs 997 is the one on the 997 actually orients above the toe link instead of below on the 996. If you simply try to flip a 996 bar it will interfere with the subframe crossbrace and engine crash bracket. If you try to sling the 996 bar below as per normal and attach to the 997 sway link attach point you will likely have to go custom for links which is easy. But the sway will still swing really low.

As for the ABS sensor, i spoke to a guy who works nothing but motorsport and street ABS systems. He works a ton of cup and other racing applications. The new longer style ABS sensor will not work with our ABS. Ours uses a passive magnetic pickup. The new street sensors get an excitation voltage from the ABS. I even asked about an interface box and nothing was available. Your only choice is either ABS retrofit or machine spindles for you sensors.

I advise going with the 997 street rear spindle and cup front. That way you only have to machine rears for our sensors. The rears should machine okay for ABS sensors as the 997 cup uses the same casting with old style sensors.

 

Yes. I've looked at the sway bar configurations. From pics alone, it looks like it's possible to do with the sway bar hanging no lower than in your second pic. The link would end up being quite short, though and it might not leave enough lateral movement for the sway bar end/upright. We'll see. No one is doing it so there is likely a reason. No biggie either way.

I'm not worried about the sensor mount. Even if I machined the upright to allow for the shorter 996 sensor, it would be a non-issue to space the longer 997 sensor back out again. I was worried about the supposed smaller internal diameter leaving enough room for a 996-style reluctor ring. But apparently this is not a problem either, according to Tom of TPC (my first link above). Pete (pete95zhn) also has 997 uprights. As I said before, we'll see

 

When i was toying with 997 c2s uprights i was able to successfully fit a 996 tension bolt no problem.

 

Good to know! Thanks!