Boxer suspension upgrade

bjunc · Jun 9, 2025 at 8:03 PM

sherpa23 said: ↑

fairly lengthy list for the internals during the major.
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Nice. What are you having done?

FerrariIcona · Jun 10, 2025 at 4:49 PM

bjunc said: ↑

Hi all,

It's come up a little bit in some of my other project threads, so I figured I'd consolidate the conversation into a dedicated thread.

Basically, I'd like to make some non-intrusive improvements to the suspension. There's more body roll than I think there should be, the front floats a little too much, and there's maybe a bit too much understeer. None of these are major problems, but I do notice them and I think (hope) most of that can be addressed by swapping out the Konis with coilovers that have adjustable compression and rebound, as well as the ability to adjust the ride height (preload the springs). I have a feeling a stiffer front spring is part of the equation as well. I'm not looking to run low-profile tires or dramatically change suspension geometry. Reducing the fender gap in the rear would be great, but that's not really the main goal.

After doing some research, I mostly settled on Ohlins TTX 36 (not the race version that requires frequent rebuilding). I spoke with their US team, who answered a lot of my questions, and then suggested I work with PSi in Sonoma California who has a lot of experience working with Koni, Ohlins, and Ferraris.

Packaging reasons might mean going with the inline version (ILX 36), or maybe remote reservoirs, etc.. After we come up with a theoretical setup, they'll ship me "dry" versions for mockup before building the final versions. The whole process will likely take a few months, so I'll post here as progress is made.

Fun fact, PSi actually works on Sammy Hagar's black boxer (which he still has). Apparently, Sammy wanted the car lowered; which PSi did the work (but recommended against). This really messed with the suspension geometry and Sammy had them change it back. I get the sense that 0.5" lowering is fine, but after an inch or so, things start to get messed up and would require a lot more work.

Lastly, PSi mentioned that the Konis can actually be modified quite a bit. I've seen others convert their Konis to height adjustable (eg Carobu), but I think you can even make the damping externally adjustable as well (PITA to adjust otherwise). That might be a Plan-B if things don't work out with the Ohlins.
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My Konis are modified with threading and BBi is lowered to where she should be. Drives great and takes bumps better than some more modern Ferrari.

sherpa23 · Jun 12, 2025 at 7:06 PM

bjunc said: ↑

Nice. What are you having done?
Click to expand...

I sent you a pm.

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