Ohlins Shock Absorber for MINI COUNTRYMAN S2000, TPX44 MNRXL0X Manual

Ohlins Shock Absorber for MINI COUNTRYMAN S2000, TPX44 MNRXL0X Manual

Ohlins TPX44 MNRXL0X Design and Functioning

Congratulations on choosing the Öhlins TPX44 Rally shock absorber - the most unique and powerful shock absorber available today. The TPX44 is a three way adjusted; high and low speed compression adjuster and a rebound adjuster, twin piston type shock absorber. It is Damping System (PDS). The TPX44 shock absorber design is the culmination of two decades of Öhlins successful participation in World Championship events. The TPX44 shock absorber is designed to handle the demanding damping characteristics needed for all types of roads on which the car is aimed to compete on.

The TPX44 for the MINI is designed in cooperation with Prodrive and the result is probably the lightest but strongest Mcpherson strut ever made for a rally application. For best performance, the shock absorber must be adjusted to different conditions; from the smooth and fast roads seen in some rallies to the more bumpy and rocky seen in others.

The Öhlins TPX44 features patent pending concept with a unique design, that allows for the gas pressure to always back-up the low-pressure side of the piston to keep pressure at a controlled level. This concept enables totally separated adjusters for compression and rebound damping. The temperature stability is maintained with a flow restriction design in the bleed valves that creates a turbulent flow at very low piston velocities. Also, materials with different thermal expansion rates are used to compensate for the viscosity change of the fluid caused by changes in temperature.

The Öhlins shim system offers infinite combinations of shim stacks with a wide spectrum of different character using only one piston. The whole system is pressurized by nitrogen gas behind a floating piston to ensure separation of gas and fluid. The Öhlins TPX44 shock absorber is a racer friendly shock absorber, easy to set up, dial in and rebuild. Support is always available from Prodrive and the Öhlins distributors worldwide.

Ohlins TPX44 MNRXL0X Compression and Rebound

Compression damping controls the energy absorption when the shock absorber is being compressed, thus controls how easy the shock absorber compresses when you hit a bump. Rebound damping controls the energy absorption when the shock absorber is being extended and controls how fast the shock absorber returns to its
normal position after being compressed.

Compression Damping Adjuster
Low speed compression is mainly used to control chassis movements and response but it also affects the traction. It affects how the car behaves during breaking, turn in and acceleration. Less low speed compression gives more chassis movement but in many cases it can improve traction and grip. Therefore it is possible to balance the car by adjusting the low speed compression. High speed compression mainly affects how the car absorbs bumps and jumps. In rougher conditions or with a lot of jumps more high speed damping is often necessary to control the big chassis movements.

Rebound Damping Adjuster
Rebound adjuster affects chassis movement in a similar way as the low speed compression but has even more influence on traction. Use this adjuster to control chassis movements over crests or after jumps. More rebound gives less movement and better stability but too much will cause a loss of traction. It is therefore a powerful balance tool together with the low speed compression adjuster.
For slippery conditions when grip levels are low, a softer set up on both rebound and low speed compression is a way to gain more traction.

Ohlins TPX44 MNRXL0X Adjust Rebound
To adjust:
Use 01822-03 adjustment tool delivered with the product.

Ohlins TPX44 MNRXL0X Adjust Rebound

  1. Turn the adjuster clockwise to fully closed position (position zero [0]).
  2. Turn counter clockwise to set the adjuster to recommended number of clicks. If you want to change setting, adjust in steps of 2-3 clicks at a time. Useful adjustment range 5-45 clicks

Ohlins TPX44 MNRXL0X Adjust Compression
To adjust:
High speed compression adjuster; Use a 12 mm wrench
Low speed compression adjuster; Use a 3 mm Allen key

  1. Turn the adjuster clockwise to fully closed position (position zero [0]).
  2. Turn counter clockwise to set the adjuster to recommended number of clicks.

If you want to change setting, High speed compression; adjust in steps of 3-5 clicks to fine tune the set up.

Low speed compression; adjust in steps of 2-3 clicks at a time.

Ohlins TPX44 MNRXL0X Adjust Compression

Useful adjustment range
Low speed 2-40 clicks
High speed 0-50 clicks

Ohlins TPX44 MNRXL0X Adjustment and Setting Up

There are different settings available to suit all different conditions. If you need support to find your own optimal set-up, please contact Prodrive or an authorized Öhlins Service Centre.

Perform the following steps and always take notes before using the shock absorber;

  1. Check ride height, front and rear. Adjust if necessary.
  2. Check corner weight, front and rear (if scales are available). Adjust if necessary.

Making adjustments
Suspension settings depend on your vehicle’s weight, your driving style, road conditions etc. If you are not happy with our recommended settings, here are a few guidelines and ground rules how to make adjustments. To make improvements, it is important to understand the function of the shock absorbers and through testing learn how they affect the handling of your vehicle.

We recommend to try keeping damper clicks around the recommended set up. If you need to make changes, we recommend to explore the alternative set up options as well as keeping damping levels low to gain maximum grip. For example; bottoming problems, a couple of clicks stiffer high speed compression together with 5mm higher ride height probably gives a better end result compared to solving everything by changing damper clicks.

When making adjustments

  • Take notes, make the adjustments in small steps (2-3 at a time) and stay within the recommended adjustment range.
  • When you think you have made an improvement, go back to what you started with and double check to be sure.
  • Pay attention to changes in conditions like tires or temperature, etc. In general, compression damping changes should be used to influence the vehicle’s response and balance while rebound damping changes should be used to influence traction and stability.

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Ohlins TPX44 MNRXL0X Manual