About Ohlins MkI-MkII Automotive, TTX40 TTX46MT Manual
Congratulations on choosing the Öhlins TTX40/ TTX46 MT damper, the latest generation of twin tube dampers from Öhlins. Get to know your TTX40/ TTX46 MT, and be sure to read this manual thoroughly before using the dampers. We recommend that you keep this manual handy. The TTX40/ TTX46 MT damper is the culmination of three decades of Öhlins’ successful participation in world championship events winning more than 200 World Championships. Many years of work together with some of the world’s most successful racing teams together with advanced dynamic analysis methods developed at Öhlins Racing headquarter in Sweden has given Öhlins the unique knowledge needed to design the TTX40/ TTX46 MT damper.
The Öhlins TTX40/ TTX46 MT damper, originally developed for formula racing, is designed to handle the demanding damping characteristics needed for all types of tracks, from street courses to super speedways. The TTX40/ TTX46 MT damper is fully adjustable with maximised damper response together with qualities you’ve never seen before when it comes to ”settings”. Low and high speed compression and rebound damping are externally adjustable and fully independent. The adjustment range is huge with equal increments of force throughout the adjustment range. Even the shape of the damping curve can easily be changed. All adjusters affect the flow from the main piston, not the piston rod displacement volume.
The compression damping forces of the TTX40/ TTX46 MT damper are not, as in a conventional damper, caused by a pressure drop on the rebound side, but by increased pressure on the compression side. This reduces the risk of cavitation and makes any reservoir valve or high gas pressure unnecessary. So, no balancing of reservoir damping to main piston damping is needed to avoid cavitation and improve damping response. Maximum response and minimum risk of cavitation will always occur. With no reservoir valve, the internal pressure of the damper unit will be kept to a minimum.
The low amount of hysteresis results in excellent short stroke/high force performance. Also, a very low gas pressure can be used without any loss of damping performance. Along with the damper comes a unique Valving Reference Program (available for download free of charge at www.ohlins.com). Make sure to choose the correct one for your damper (MkI/MkII). This computer model of the damper will allow you to find damping curves without a dynamometer. It will reduce building time tremendously and allow exact damper adjustments in pit lane. The TTX40/ TTX46 MT product will revolutionise the work for mechanics and engineers in the racing business.
This manual text is based on TTX40/ TTX46 MT dampers. These are through rod type dampers loaded with several new concepts. As always, all dampers are tested before they are delivered to the customer. In keeping with Öhlins long tradition of perfection, quality is outstanding and long life is to be expected.
Valve description - TTX40/TTX46MT MkI
The compression bleed valve (low speed) is in parallel with the compression poppet valve (high speed) and the rebound bleed valve (low speed) is in parallel with the rebound poppet valve (high speed). The poppet valves are pushed against their seats by preloaded coil springs. The preload is externally adjustable. The amount of preload of the poppet valves determines the pressure differentials across the main piston necessary to make the poppet valves open. For more information about the bleed valves and the poppet valves, see chapter External adjusters. The shim valves are placed on the nose of the poppet valves. These shim stacks affect the opening characteristic of the poppet valves. The shim configuration can be changed to achieve different opening characteristics of the poppet valve. Also, there are two check valves installed in the damper, making the compression and rebound valves fully independent.
Valve description - TTX40/TTX46MT MkII
The compression bleed valve (low speed) is in parallel with the compression shim valve (high speed) and the rebound bleed valve (low speed) is in parallel with the rebound shim valve. The shim stacks are pushed against their valves by preloaded coil springs. The preload is externally adjustable. The amount of preload of the shim stacks determines the pressure differentials across the main piston necessary to make the shim valves open. For more information about the bleed valves and the shim valves, see chapter External adjusters. The combination of shims on the valve affect the opening characteristic of the valves. Also, there are two check valves installed in the damper, making the compression and rebound valves fully independent.
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