Everything about Fat Cat Motorsport Suspension

[cobra]

With 700lb rear spring rates that's 2.13Hz. That's pretty high for a street car, no wonder it felt so stiff.

[Casa de Mesa]

Yeah, sounds like it's under-damped. I run similar spring rates and it's very composed.

Exactly where my head went to with my earlier question.

[maupineda]

the fact the initial point was so off made me wonder how good the setup actually is, for a 3K custom job I would expect being bang on (or very close to) from the get-go.

[DJAM3]

Yeah, sounds like it's under-damped. I run similar spring rates and it's very composed.

[r4dr]

That's bizarre, considering I assume they valved it to your spring rates?

[Casa de Mesa]

The FCM setup doesn’t have adjustable rebound and compression. They are custom valved and dyno’d to your car. I provided all the corner weight and spring setup in advance.

I must have missed that part while reading up on this. Interesting...

See, it was a dumb question.

[duracellttu]

Dumb question but have to ask. Did you try bumping up rebound and/or compression with the ~700# springs? That's a big shift in spring rate. If you're not controlling that energy, it could act like a bum shock. "Long last oscillations" is what I'm zeroing in on.

The FCM setup doesn’t have adjustable rebound and compression. They are custom valved and dyno’d to your car. I provided all the corner weight and spring setup in advance.

[Casa de Mesa]

I initially had a 350/336 and 700/675 setup that caused some extremely uncomfortable and long lasting oscillations when going over bumps. The car just wouldn’t settle. It wasn’t drivable. For grins I swapped the rear spring back to my TCK 500# pair and it completely eliminated the oscillations.

Dumb question but have to ask. Did you try bumping up rebound and/or compression with the ~700# springs? That's a big shift in spring rate. If you're not controlling that energy, it could act like a bum shock. "Long last oscillations" is what I'm zeroing in on.

[duracellttu]

Man, all this and no review? Bummer.

OP, you still out there in TV land?

Hey everybody, I’m still here. Shortly after my last post work sent me on a 6 month training course. I was away from home and unable to finish work on the car. I’ve been back home for a few months and diligently workin to wrap things up.

I was able to drive the car on my first spring setup and the new dampers only for a short while. My initial impressions were mixed, since the spring setup based on the ride harmony spreadsheet were causing me issues. I initially had a 350/336 and 700/675 setup that caused some extremely uncomfortable and long lasting oscillations when going over bumps. The car just wouldn’t settle. It wasn’t drivable. For grins I swapped the rear spring back to my TCK 500# pair and it completely eliminated the oscillations. Nothing else was changed other than the rear spring rate. There was just too much rear spring with that setup and I targeting a ~2.0 Hz bound frequency. This is leading me to experiment with a 525/550# setup to trying and keep the corner balance spring rate approach. More to come and I’ll post some pics of my install and parts soon.

[tlow98]

Man, all this and no review? Bummer.

OP, you still out there in TV land?

[lvm3sm46]

I just received my dampers from FCM the other day. I’m planning to install over the weekend. I’ll post a few pics of what was delivered, when I get a chance. Super excited about this!

How is the new set up?

[duracellttu]

Does anyone have any updates on the progress of their FCM builds?

I just received my dampers from FCM the other day. I’m planning to install over the weekend. I’ll post a few pics of what was delivered, when I get a chance. Super excited about this!

[r4dr]

Does anyone have any updates on the progress of their FCM builds?

[0-60motorsports]

No, I only work on Bilstein-based monotubes. I also don't 'rebuild' but optimize - my entry level service is a high-end upgrade.

Thanks for the clarification.

[Suspension Decoder]

Do you rebuild GC DA shocks? I read somewhere before that FATCAT did them. I would be looking for a normal rebuild of the front shocks. Thanks.

No, I only work on Bilstein-based monotubes. I also don't 'rebuild' but optimize - my entry level service is a high-end upgrade.