Ohlins Shock Absorber for High Level Racing, TTR Manual

Ohlins Shock Absorber for High Level Racing, TTR Manual

Ohlins Shock Absorber TTR Design and Functioning

Öhlins now releases the TTR damper – a 4-way fully independent adjustable damper based on well proven technology that has been behind winning success for many years in high-end factory racing in IndyCar, Le Mans and DTM. This high end racing damper is now available for teams seeking optimal performance and ontrack success.

Features include a precise valving system, both high and low speed can be zeroed externally to ensure an accurate matching between dampers while at the same time maintaining reference clicks.

The TTR damper combines top performance with user friendly handling, for instance change valving in close to one minute. The damper also comes with valving simulation software, drastically reducing time from idea to ready damper and helps making accurate adjustments at the track.

Ohlins TTR Features

• 4-way fully independent adjustable damper
• Solid piston
• Well proven valve technology
• Through-rod design to minimize hysteresis
• Large adjustment range
• Top performance combined with easy handling
• Change valving in close to 1 minute
• Comes with valving simulation software
• Precise valving system, both low- and highspeed can be zeroed externally.

Ohlins Shock Absorber TTR Service and Maintenance

After every use

• Measure the position of the separating piston. See Chapter 9 Check Oil Level in the Workshop Section.
• Look for oil leakage. By keeping the damper clean and dry, any leakage will be easy to detect. If oil is leaking from the X-ring seal repeatedly, replace X-ring and inspect the piston rod for imperfections on the surface.
• Inspect the dampers for external wear or damage.
• Check the spherical bearings regularly for excessive play. On installations where the spring is not of coil over type, a gap is more critical as the bearings will see loads in both directions.

Recommended Service Intervals

• After 30hours or 6000Km
• After 15hours or 3000Km if working temperature exceeds 110°C If the shock absorber reaches a temperature of 140°C or more it needs immediate service.

Recommended service, change/ replace;

• oil
• o-rings, x-rings
• piston band
• bushings

Ohlins Shock Absorber TTR External Adjusters

Low Speed Compression Damping Adjuster (LSC)

Adjuster type: Bleed adjuster
Identification: Gold coloured knob
Number of positions: Approx. 55 (10 clicks/turn)
Click position 0: Fully counter clockwise at minimum force (orifice open)

Low Speed Rebound Damping Adjuster (LSR)

Adjuster type: Bleed adjuster
Identification: Silver coloured knob
Number of positions: Approx. 55 (10 clicks/turn)
Click position 0: Fully counter clockwise at minimum force (orifice open)

High Speed Compression Adjuster (HSC)

Adjuster type: Poppet valve
Identification: Screw with internal 3mm hex (inside the gold casing)
Number of positions: approx. 40 (8 clicks/turn)
Click position 0: Fully counter clockwise at minimum force (spring min preloaded)

High Speed Rebound Adjuster (HSR)

Adjuster type: Poppet valve
Identification: Screw with internal 3mm hex (inside the silver casing)
Number of positions: approx. 40 (8 clicks/turn)
Click position 0: Fully counter clockwise at minimum force (spring min preloaded)

Ohlins Shock Absorber TTR Zeroing

See the examples below for results after calibrating Low Speed and High Speed Valve. To calibrate according to the example below see Low Speed Zeroing and High Speed Zeroing on the following two pages.

Recommended Tools when Zeroing

Adjustment tool	01899-01
Screwdriver
1mm hex screwdriver
1.3mm hex screwdriver
3mm hex screwdriver

Low Speed Zeroing

Choose one of your shock absorbers that is closest to the Valving Reference Program (VRP) as a reference.

1. Check in the dyno the number of clicks needed to close or open the adjuster to match your reference.
2. Turn the adjuster to fully open by turning counter clockwise until stop.
3. Note that there are two lock screws, one on each side of the adjuster. Unlock these;
   1. Turn the adjuster half a turn clockwise so that you can unlock (½ turn) the screw that was facing in. Use a 1.3mm hex screwdriver.
   2. Turn the adjuster counter clockwise until stop. Loosen the screw facing out.
4. Use a screwdriver and turn the slotted centre screw. Turn the number of clicks that was defined in step 1. Note that one groove, or the distance between two peaks, equals one click. Turn clockwise to obtain increased force. Turn counter clockwise to obtain less force.
5. Push the knob towards the cylinder head and at the same time lock the screw facing out.
6. Turn the adjuster half a turn clockwise. Push the knob and lock the screw that was facing in.
7. Turn the adjuster to fully open by turning counter clockwise until stop.
8. Set the adjuster to the desired number of clicks. Run the shock absorber once again in the dyno to confirm your set-up 

High Speed Zeroing

• Loosen the 1mm hex screws. Note that there are two on each side of the two Adjustment housings.
• Use a 3mm hex screwdriver to fixate the Adjustment screw.
• Use tool 01899-01 (3A) to zero. Turn counter clockwise to obtain less damping force. Turn clockwise to obtain increased damping force.
• Lock the 1mm hex screws by only slightly tightening each screw at a time in a cross pattern not to make the Inserts skewed into the Adjustment housing.

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