Also showing front bump stop data.

The upper ring of the rear dust boot is captured inside that segment I point out in the video. The bump stop has a 'seamless' upper section that is also including the solid bump stop ring. A cool design. So since the dust boot wasn't included in the dyno test it's not a fully accurate picture of the bump stop behavior, since that gap in the first two bottom segments would actually be filled with plastic.

Effective spring rates are about 184 lb/n for the front OE bump stop (first 1/2 inch of compression) and then ramping to about 277 lb/in for the next 0.4 inch of compression).

The rear OE bump stop has an effective spring rate of about 107 lb/in (first 3/4 inch of compression) increasing to about 137 lb/in over the next 0.4 of an inch of compression.

This rising-rate front bump stop and softer density rear bump stop, plus the higher front motion ratio, helps explain why the F56 Mini Cooper would understeer at the limit on the factory bump stops.

For high-performance driving, we recommend using our FCM 47mm strut style front bump stop and a 58mm 'white' (medium density, ~200 lb/in) rear bump stop. For a more comfortable ride we suggest the 47mm strut style front with a 58mm 'red' rear stop. You can also packers or bump stop spacers to further fine-tune the handling of your Mini.

All FCM stops are linear and do not have any 'two-stage' spring rate designed in unlike most factory bump stops.

Fat Cat Motorsports bump stops and packers are available from 5xracing.com.

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