Anybody have recommendations for adjustable rear toe links? I’m wondering when I should move to this to improve rear toe under hard braking. As it is I don’t brake very hard. I’m also hesitant to make it non stock because of autocross classifications but I guess realistically this won’t be an autocross car.

The alignment tech at the dealer recommends Porsche Motorsport/GT4 ClubSport rear toe links because of how the adjustment is set. The other aftermarkets are difficult to adjust.

TPC have some that alter the toe geometry somehow. Anyone know how this works? How are these compared to the motorsport links in terms of quality and ease of adjustment?

 

If you search the forum and TPC website the have charts about the geometry. There is angood sticky managed by a former GT4 owner/ racer (who died of cancer) at the top of the GT4 forum Which is full of great advice inc toe links sources and geo!

 

Thanks. What I’m saying is I don’t understand how a different toe link affects the relationship between toe and compression/extension. It just looks like a bar with connections at the ends. How is it physically different from any other toe link that it reduces toe variation for the same ride height?

Also I wanted to hear any experiences with the Porsche Motorsport toe links specifically, including where to get them.

 

Any reason why you can't call TPC directly to get that info? Tom, from TPC, is also a regular contributor on this forum.

 

This thread has a lot of great info:

https://rennlist.com/forums/gt4/9731...toe-links.html

They have an offset bushing that reduces toe deviation.

 

Manthey racing told a Rennlister that the hubs were difft for the GT4 clubsport and so the Clubsport toelinks weren't suitable. The GT4 clubsport and roadgoing GT4 do have difft part numbers for the hub carrier too. Manthey make a revised set up, maybe ask them and TPC to compare.

https://rennlist.com/forums/gt4/9109...-race-car.html

Several people have looked at TPC toelinks (the thread above) and use with DSC. Claim that the hard braking wobble reduces.

I am not brave enough/good enough to have encountered this materially !

 

Interesting. I have PMNA toe links on my street GT4; I assumed they were the same part that is used on Clubsports, but possible it's different.

 

Suspect you are right, maybe Manthey was selling its own uograde. Most motosports oarts seem to be available at a price from Bgb if you ask them, they will know!

 

OP, If the issue is stability under hard braking you need to add more rear toe. Any aftermarket adjustable toe link will let you do this. I used Tarett for a few years and then switched to TPC because of "better" geometry. With TPC I could run a little less toe. A Guard LSD also works.

 

how did you get the PMNA toe links? Do you have a part number? What kind of alignment do you run?

 

cool. Good to hear some user experiences with the TPC. Are they easy to work with for alignment?

how does a guard LSD change rear toe?

 

LSD doesn’t change toe, it aids traction by ensuring that load and speed on both wheels are the same, transferring braking or acceleration force across the axle.

When one wheel starts to slow down it will transfer more of the braking force to wheel that is turning faster.

The Factory LSD in the GT4 does this job. But it is known to be relatively mild 22/27 and wears out after not that long… leaving you with a open diff. If your car had the gearbox replacement, the LSD is a built in to the box casing so you will have a ‘new’ one with your new gearbox… but this will soon wear again depending on usage.
An aftermarket LSD such as Guards can be made to be much stronger and more aggressive than the 22/27, to more like 50/50 or 60/40. It’s also motorsport grade and built to last.
Wavetrac is another alternative type of diff… automatic torque biasing but it provides force to both wheels on the axle even in zero load conditions.

 

I got them from Wray @ BGB. Not sure of the part number. Tarett toe links have the Motorsports style adjustment now, btw.

Alignment wise I run similar to specs to what is written about in the Track Setup sticky thread. -3.0 front, slight toe out; -2.7 rear, toe in.

 

I used TPC rear toe links and their DSC box. I was able to use less toe in in the rear which was helpful. The rear felt a lot more stable under high speed braking after modification.

If I go back to a GT4 I wouldn't hesitate to do the same again.

 

TPC uses a modified bushing that slightly moves the arm forward on the chassis side mounting location, which changes the pivot point, and thus, toe change throughout the suspension range.

I have these links (no DSC controller, yet), and the toe change is definitely improved on the track.