Everything about Fat Cat Motorsport Suspension

[K-Dawg]

FCM only services Bilstein-based nonadjustable dampers. Flat ride theory works with any dampers.

Any more feedback on FCM's services?

I saw on Obioban 's journal that a 60/40 bump/droop ratio puts his car at 14" front ride height. Any bottoming-out at this height?

What is the stroke of the H&R front damper?

Does FCM typically modify the internal bump stop?

While I'm asking questions, what is the stroke of the Bilstein B6 front strut?

[bigjae46]

Can FCM optimize TC Kline doubles?

I'm happy with mine on 450lb/700lb springs. I need to have mine rebuilt soon...they are getting bouncy. It takes a good minute for the car to settle after some bigger bumps. My shocks are 9 years old and have about 60k miles on them.

[Dxj]

I figured I add a little here as I got FCM suspension installed earlier this year and wanted to share with the community.
I came from PSS10 suspension which felt like a good all around suspension but soft for the track and stiff for the street (my car is not a dedicated track car). It was ok but felt like there was too much body roll and weight transfer. I went to FCM with 392 F and 750 rear spring rates. Mind you, at the same time, I did full CMP subframe reinforcement with solid subframe bushings and new oem diff bushings.
overall, the car feels softer and more enjoyable on the street (assuming lower gas pressure delivered that) …bumps are better absorbed, with less drama. On the track, it is stiffer when it comes to roll and weight transfer (there is still some body roll…not too stiff) but I still feel the ability to absorb bumps as opposed to bouncing off of them. Lap times did get better but I’ve been also working on evaluating data and making sure I make improvements when behind the wheel so I can’t say it’s all suspension.

[K-Dawg]

He didn't say it was stiff, and those rates aren't excessively high.

Something doesn't jive. Are you sure of the actual rates of the new 700/675 lb/in springs? Did you discuss the issue with Shaikh? What you're describing sounds like the rear spring rates are too soft, but I'd think that would be evident when you install them.

Maybe try sticking the 700/675s back in and see if the issue returns.

[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?