Tarett, Elephant Racing, or Rennline Camber Plates?

[WillyDaP]

Thanks J-Dub, that is one more option to look into. Appreciate you posting this and I still have not decided on one so now I can research 4 of them.

[blueline]

Replaced the Tarett rod ends for the rear toe links. All four are now new - inner and outer, both sides. (There was a very slight bit of play in the inner passenger side rod end. That was after about 1,850 track miles on the original Tarett setup.)

I think the new Tarett ends are somehow better than the originals - something about being tighter. In any event, they are inexpensive and it's best to replace all four as a set.

The rod end replacements required a fresh alignment. Nick was able to eke out a bit more negative camber all around to -2.75 square. (He does one heck of a job. Perfectionist.) That's all the negative camber there is out of the current setup but I think it's about perfect for my needs.

PXL_20231126_214752926.jpg (4.38 MiB) Viewed 992 times

GT4 alignment screenshot 2023-11-30.png (764.02 KiB) Viewed 992 times

[WillyDaP]

Since, at present I do not want to do much except set up the car for front camber adjustments , it appears Tarett may be the best initial set up, though I will admit the guys at Dundonmotorsports.com ( thanks J-Dub ) are a very cool group of individuals. Mainly focused on Trackrats , especially with GT3, GT4 and full blown Porsche racing machines, they have a neat set up where they have you set up and appt. to chat with them about your concerns. They are very, very good about getting back with you and I definitely prefer talking to someone than just endless emails or using a chat box.

I did not plan on doing anything with the rear adjustment as I am already at the low setting for the suspension and it seems most of the rear camber type plates require raising the rear springs or other adjustments. I may be wrong there but there does seem to be some additional items required. What kind of rear camber can be achieved with the stock components, as I was under the impression you could get pretty good adjustment in the rear, the front was the problem.

I am limited in what I can do for Time Trials in the GTS ( 4.0 ) and stay in the Class I would prefer.

[blueline]

Bill, with stock components, the max negative camber I could get in the rear was -1.71 (left) & -1.73 (right). For the front, the max with stock parts was -1.78 on both sides.

[J-Dub]

Bill,
On my GTS I am at 2 deg rear camber, 2.5mm per side toe in and the eccentrics still have more room to go. I am not sure why this differs between the GTS and the GT4.

[blueline]

Bill,
On my GTS I am at 2 deg rear camber, 2.5mm per side toe in and the eccentrics still have more room to go. I am not sure why this differs between the GTS and the GT4.

There are differences but I'm not sure of the exact specifics. (The GT4 uses some GT3 parts on the front suspension.)

From an accomplished Porsche instructor, racer, and racecar builder and set-up wizard who is also a good friend:

“If we take some lessons from PMNA, the Clubsports come with 2.5 degrees of camber, modified upper strut mounts, more shims, offset wheels and turnbuckle style rear arms. On race cars I immediately add a full degree (3.5 degrees) in the front and leave the rear at 2.5 degrees. Toe-out in front and nominal toe-in for the rear to stabilize high speed braking. Then a corner balance!"

"As I mentioned before, the factory GT4 suspension has limited settings. To get max camber and toe-out you are at the limit of the eccentrics, slots and rod lengths. This is why you must change them with components that already have some camber with broader ranges built into them."

[blueline]

Bill,
On my GTS I am at 2 deg rear camber, 2.5mm per side toe in and the eccentrics still have more room to go. I am not sure why this differs between the GTS and the GT4.

Also, this older emailed info from Nick (lead Gold tech/shop foreman at PoN) June 2021:

“I’ve got your car up on the alignment rack and the most camber I can get out of the front is -1.8 on each side. I was going to look into using control arm shims like on a GT3 (they are GT3 lower control arms) to achieve -2.00 or -2.50. However, I found this detail in the [Porsche] workshop manual:”

Front-axle camber setting: The camber adjustment on the front axle on the Cayman GT4/Spyder is performed only via the supporting mount. The intermediate plates -Arrow- on the 2-part wishbone must not be changed, as this can result in an impermissible wheel overlap at the wheel housing.
(This is a straight quote from Porsche tech svc manual.)

[WillyDaP]

Since it appears I may not be able to add anything in the rear, going with Tarett Club Sports may be the best bet, but like any Time/Trialer of Autocrosser I am looking for an edge. Have a rule designation question out there with a friend at SCCA. so that may determine my decision. Thanks for all the help and advice guys!!

Crazy thing is I can do a lot more with NASA, and that is primarily what I will run, but the changes I could make with NASA would bump me up two Classes in SCCA. It may become mute, by the time I get wheels, tires, PPF, grill guards, camber plates, I will likely be out of funds anyway , ha. I have not even figured in the littler items like better pads, Girodisc rotors ( later in the year ), GT3 brake ducting plates ( those are cheap ) and maybe a second set of wheels. I am not going down the Rabbit Hole, I have already planned ahead enough that there is a huge sinkhole appearing in front of me.


i.e. - rabbit hole , a money pit with the opening big enough for a bunny to drop down in.
i.e. - sinkhole. A depression in the Earth that can swallow houses, buildings, roads, and more.

And then you guys keep giving me new ideas and the whole is swallowing all my credit cards, ha!

[blueline]

@WillyDaP

Regarding your questions about shims, etc., they are answered in part in my two posts above, #16 & 17 regarding the GT4. But, as I mentioned, what I posted may not be/apparently is not the case for a GTS. (??)

[blueline]

Since it appears I may not be able to add anything in the rear, going with Tarett Club Sports may be the best bet, but like any Time/Trialer of Autocrosser I am looking for an edge. Have a rule designation question out there with a friend at SCCA. so that may determine my decision. Thanks for all the help and advice guys!!

Crazy thing is I can do a lot more with NASA, and that is primarily what I will run, but the changes I could make with NASA would bump me up two Classes in SCCA. It may become mute, by the time I get wheels, tires, PPF, grill guards, camber plates, I will likely be out of funds anyway , ha. I have not even figured in the littler items like better pads, Girodisc rotors ( later in the year ), GT3 brake ducting plates ( those are cheap ) and maybe a second set of wheels. I am not going down the Rabbit Hole, I have already planned ahead enough that there is a huge sinkhole appearing in front of me.

i.e. - rabbit hole , a money pit with the opening big enough for a bunny to drop down in.
i.e. - sinkhole. A depression in the Earth that can swallow houses, buildings, roads, and more.

And then you guys keep giving me new ideas and the whole is swallowing all my credit cards, ha!

Lololololol. We are innocent of all charges your Honor. (See what I did - "charges" as in credit cards. )