1998 Z3 1.9l Autocross Build

Gotcha. I had installed a 28mm H&R on the softest setting on the front, and a used rear bar from a 1999 M Coupe that's 4mm thicker than what mine came with for my last AutoX, and while it certainly rolls less, my shocks and tire pressures were NOT set up well to accommodate them and I felt like understeering was a problem.

I have another AutoX in two weeks, and I'll try different shock adjustments and tire pressures and see how the understeering is. If I tame it, I would love to set the fronts even stiffer...
 
Llama said:
Gotcha. I had installed a 28mm H&R on the softest setting on the front, and a used rear bar from a 1999 M Coupe that's 4mm thicker than what mine came with for my last AutoX, and while it certainly rolls less, my shocks and tire pressures were NOT set up well to accommodate them and I felt like understeering was a problem.

I have another AutoX in two weeks, and I'll try different shock adjustments and tire pressures and see how the understeering is. If I tame it, I would love to set the fronts even stiffer...
Click to expand...
My Konis are full stiff front and one-quarter turn off soft at the rear.
 
Sears Point (Sonoma Raceway), CA Jun 10 2026

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And...

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Those brakes going to need all the air it can get at Laguna Seca................
 
So another AutoX weekend in the books for me. Saturday practice. Sunday official runs in the morning and practice runs in the afternoon. I just installed Bridgestone Potenza RE-71RZ tires so this was a good chance to get acclimated. I managed 3rd out of 7 in C Street, and kept trying new things Sunday afternoon and got a significantly faster run. Here's a video of 5 runs...

 
It looks like we have the same front sway bar. I'm still using the stock links, but recently moved them from the outer holes (softest) to the inner holes (firmest.) I can't imagine these adjustable links are allowed in the stock classes in SCCA.

Have you noticed any improvement or changes with these?
 
Llama said:
It looks like we have the same front sway bar. I'm still using the stock links, but recently moved them from the outer holes (softest) to the inner holes (firmest.) I can't imagine these adjustable links are allowed in the stock classes in SCCA.

Have you noticed any improvement or changes with these?
Click to expand...
Just installed them...not even on the ground yet.

They are allowed in E Stock:

13.7 ANTI-ROLL (SWAY) BARS
A. Substitution, addition, or removal of a single anti-roll bar and supporting hardware (brackets, endlinks, bushings, etc.) is permitted. The use of any bushing material is permitted. A bushing may be implemented as a bearing.

It's the H&R bar. I am going to try the soft hole this next time out in late Aug. I may end up back at hard, but I wanna give it another try. And now it's way easier to change.
 
Interesting. I don't recall that extra stipulation about the links, but there it is. I look forward to hearing what you think about them.
 
Amazing timing, I just had that repair last month.

Hey, since I've got you, can you talk about your seat harness? What is it? How is it anchored? Is there a shoulder-height seatbelt guide on BOTH sides of your seat?
 
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