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Owners Manual
Öhlins car shock absorber for Honda S2000
Including:
Safety
How the
shocks works
Setting up
the car
Making
adjustment
Trouble
shooting
Inspection and
maintenance
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Safety signals
Important information concerning safety is
distinguished in this manual by the
following notations:
The Safety alert symbol means:
Caution! Your safety is involved.
WARNING!
Failure to follow warning instructions
could result in severe or fatal injury
to anyone working with, inspecting or
using the suspension, or to bystanders.
CAUTION!
Caution indicates that special precautions must be taken to avoid damage to the suspension.
NOTE!
This indicates information that is of
importance with regard to procedures.
© Öhlins Racing AB.
All rights reserved.
Any reprinting or unauthorized use
without the written permission of
Öhlins Racing AB is prohibited.
Printed in Sweden.
Introduction
All of Öhlins advanced suspension products are
adapted to the brand and model. This means that
length, travel springaction and damping characteristics, are tested individually just for the
motorcycle that you have decided to fit with
Öhlins suspension.
Before installation
Öhlins Racing AB can not be held responsible for
any damage whatsoever to shock absorber or
vehicle, or injury to persons, if the instructions for
fitting and maintenance are not followed exactly.
Similarly, the warranty will become null and void
if the instructions are not adhered to.
Contents
Safety signals ................................................ 2
Introduction ................................................... 3
Design ........................................................... 3
When you are driving ..................................... 4
External adjusters .......................................... 6
Recommended settings ................................ 6
Setting up your car ........................................ 6
Making adjustments ...................................... 7
Maintenance, inspection. ............................... 7
Trouble shooting ............................................ 7
WARNING!
1. Installing a shock absorber, that is not
approved by the vehicle manufacturer, may
affect the stability of your vehicle. Öhlins
Racing AB cannot be held responsible for
any personal injury or damage whatsoever
that may occur after fitting the shock
absorber. Contact an Öhlins dealer or other
qualified person for advice.
2. Please study and make certain that you
fully understand all the mounting instructions
and the owners manuals before handling this
shock absorber kit. If you have any questions
regarding proper installation procedures,
contact an Öhlins dealer or other qualified
person.
3. The vehicle service manual must be
referred to when installing the Öhlins shock
absorber
NOTE
Öhlins products are subject to continual improvement and development. Consequently, although
these instructions include the most up-to-date
information available at the time of printing, there
may be minor differences between your suspension and this manual. Please consult your Öhlins
dealer if you have any questions with regard to
the contents of the manual.
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Introduction
Öhlins Racing congratulates you on your choice
of shock absorbers for your vehicle.
Your new Öhlins high performance shock
absorbers are developed from experience gained
during years of successful co-operation with the
World Championship winning teams.
Total shock absorber length, spring travel and
damping forces are developed just for your car.
The design and the settings are consequently the
results of extensive testing and no guesswork!
All Öhlins shock absorbers are designed with just
one aim; to win races.
To design a winner you need a concept starting
with a unique know-how. You add engineering
skill, precision and the best materials available.
The result is quality, endurance and winning
performance.
Our shock absorbers are used by the winning
teams in World Rallying, Touring Cars, CART and
by several top teams in Formula Atlantic, Formula
3, Formula Ford, NASCAR, Late Model and in
Truck Racing, etc.
Öhlins suspensions have dominated the motorcycle and the car racing scene for several years
and have captured over 80 World Championship
titles!
A network of authorised Öhlins service centres
around the world, with specially trained mechanics,
can help you with personally tuned settings, service,
repairs and spare parts.
Design
Öhlins car shock absorbers are based on Öhlins
successful application of the ”de Carbon”
concept. In short, that means that the damping
oil is put under gas pressure, and separated from
the gas by a floating piston.
The de Carbon concept has many advantages.
It prevents the risk of cavitation, that can wear
out internal components and cause inconsistent
damping. It eliminates aeration of the damping
oil, which also causes inconsistent damping.
It improves the cooling, because the oil is in direct
contact with the outer tubing. It gives more
consistent damping, regardless of the shock
absorber’s working temperature, and it makes the
shock absorber last longer.
The shock absorber reservoir, connected directly
to the shock absorber body is in fact an ”extension” of the main body which contributes to the
improved cooling. The reservoir contains the
floating piston and the gas that pressurises the
damping oil. The oil is forced through a base plate
reinforcing the damping.
At low shaft speeds the damping oil is forced
through an adjustable bleed valve in the main
piston. The valve affects mainly rebound damping
and has only a small effect on compression
damping.
The adjuster is connected to the valve via an
aluminium shaft, that runs inside the piston shaft.
When the temperature in the shock increases the
aluminium shaft extends, thereby closing the
bleed valve gradually.
This diminishes the influence of the oil viscosity
changes due to temperature, keeping the flow
through the valve virtually the same, regardless
of temperature.
At higher shaft speeds the damping forces are
primarily controlled by the main piston and its
compression- and rebound shim stacks. By
changing the numbers, diameter, and thickness
of the shims in the stack and by using different
jets in the valves, your Öhlins shock absorbers
are tailor-made for just your car.
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Key features
• Lightweight aluminum body
• Large reservoir for better cooling
• Double acting damper adjuster
• Quick response for best handling
• Optimum consistency on long runs
• Easy to dial-in, reshim, rebuild and service
• Professional technical support
• Base valve
• Large diameter floating piston
4
When you are driving
Base plate
The Öhlins WCJ and MCJ shock absorbers
features a base plate, which allows the damper
to work smoother and safer (fig.2 and 4).
This base plate eliminates the cavitation risk,
without the need of increased gas pressure. It
consists of a fixed dividing wall with apertures
and with shims on both sides. In the center there
is a jet that is available in different sizes.
The stiffer the compression valving on the main
piston, the more restrictive the hole in the base
plate jet.
The fluid that flows through the base plate is the
volume of the shaft displacement, which also
moves the floating piston.
The shims on the compression side eliminate
the risk of cavitation, and the shims on the
rebound side works as a check valve.
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432
Compression phase Rebound phase
On a smooth surface
When you are driving on a smooth surface and
the shock absorbers are compressed slowly (low
shaft speed), the damping oil is forced only
through the adjuster valve in the piston shaft, fig
1, flow 3.
The oil displaced by the piston shaft is forced
through the valve in the independent compression damping base plate into the large diameter
reservoir, fig 2
The floating piston in the reservoir is forced to
move, compressing the gas behind it further.
When the shock absorber extends, the pressure
behind the floating piston will force the oil through
the valve in the base plate, and back into the
shock absorber body, fig 6, flow 1 and 2.
The oil beneath the piston returns through the
adjuster valve in the piston shaft, fig 5, flow 3.
Hitting a bump
When you are hitting a bump the shock absorbers
are compressed fast (high shaft speed). The oil can
not be forced ” fast enough” through just the valve
in the piston shaft. The pressure on the
compression side increases and opens the shim
stack covering the compression orifices in the
piston, fig 1, flow 2.
Also, oil displaced by the piston shaft can not
be forced ” fast enough” through just the valve in
the base plate. The pressure increases and a shim
stack, parallel to the valve, opens, fig 2.
The floating piston is forced to move, compressing
the gas.
When the shock absorber extends, the floating
piston will force the oil through the base plate
back into the shock absorber body, fig 4.
The pressure difference over the piston is still
high and the flow can not be forced ”fast enough”
through just the valve in the piston shaft. The shim
stack covering the rebound orifices in the piston
opens and the oil returns, fig 1, flow 1.
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External adjusters
On the Öhlins shock absorber, the rebound
adjustment device is located at the end of the
piston shaft. Adjustments are made with a 3 mm
Allen key (Fig 5).
The temperature compensation system of the
rebound adjuster reduces the number of clicks
(due to the elongation of the aluminium shaft, as
described earlier) when the shock absorber is hot.
Therefore, always make changes from the
previous click position without first closing the
adjuster.
To count the number of clicks you are using, first
let the shock cool down to ambient temperature.
Recommended settings
The shock absorbers in your kit are adjusted to
the Öhlins recommended setting for your car, see
Mounting instructions. We advise you to use this
as your start setting.
Setting up your car
Installing new shock absorbers may alter ride
height, wheel angles etc. on your car. Therefore, it
is wise to do a complete resetting of the car after
you have installed the Öhlins shock absorbers.
Perform the following steps before using the
shock absorber:
NOTE!
Using to much force when closing the adjuster
will destroy important sealing surfaces.
Use no tool, simply your fingers.
All the adjusters have a normal right-hand thread.
Click position zero (0) is when the adjusters are
turned clockwise to fully closed.
1
Check ride height front and rear.
Adjust if necessary.
2
Check corner weight front and rear,
if scales are available.
Adjust if necessary.
3
Check all wheel angles front and rear.
Adjust if necessary.
WARNING!
Added damping force
Reduced damping force
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There is no stop telling when the adjusters are
fully open.
It is possible to unscrew the strut rebound
adjuster if more than the recommended usable
clicks are used.
Please see ”Setting up your car”.
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Making adjustments
Suspension settings are dependent on your car’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 car.
Always start with the Öhlins recommended
settings, see ”External adjusters” and ”Recommended settings”.
NOTE!
Higher click numbers give less damping force.
When making adjustments; keep notes, make
adjustments one at a time and in small steps.
The adjusters should normally not be adjusted
in steps of more than 2 clicks at a time and not
outside the usable click 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 temperatures, etc.
In general, compression damping changes
should be used to influence the car's stability and
response, while rebound damping changes should
be used to influence comfort and traction.
When you need more damping force, you should
mainly try to increase compression damping and
use as little rebound damping as possible.
This usually means that you gain comfort and
handling performance
Trouble shooting
The solutions below are what normally works.
Again, if the car is not properly set up, the result
can be totally different.
Regarding traction, the tires of course have a
very large influence.
Also bear in mind that you normally have to make
a compromise between the different behaviours
of the car to achieve the best overall performance.
A
Bad traction on loose gravel.
Increase rebound damping on all 4 corners.
B
Bad traction on tarmac.
Decrease rebound damping on all 4 corners.
C
Turn in understeer.
Normally not a damper problem, but try increasing rebound damping on the front.
D
Mid/exit understeer.
Try increasing rebound damping on the front.
Take into account that behaviour on corner entry
also can influence this phase.
E
Mid/exit oversteer.
Normally depending on wrong spring and anti-roll
bar combination, but try reducing both compression
and rebound damping on the rear.
Maintenance, inspection
After every competition or hard run:
1
Clean externally and spray with an all-purpose
oil after washing with detergent.
2
Check externally for damage.
Every 10 000 km:
1
Clean all parts with a soft detergent.
2
Lubricate the piston rod (except the thread) and
the scraper with a layer of Öhlins red grease, part
No. 146-01 (100 grams) or 146-02 (400 grams).
After 50 000 km:
Change shock absorber oil. Use Öhlins shock
absorber oil only!
NOTE!
Discarded Öhlins products should be handled
over to an authorized work shop or distributor for
proper disposal.
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More info
www.ohlins.com
The ultimate suspension site.
Find out everything about your suspension.
Download mounting instructions, manuals and brochures.
Öhlins Racing AB, Box 722, S-194 27 Upplands Väsby, Sweden
Phone +46 8 590 025 00, Fax +46 8 590 025 80
And a lot more.
Your Öhlins dealer:
07460-01 Honda S2000, Issued 03 04 10. Teknisk Illustration AB. 100 ex.
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