dampers auto - Bos Engineering Suspensions
Transcription
dampers auto - Bos Engineering Suspensions
User handbook standard adjustments DAMPERS AUTO CR CONTENTS Introduction Mounting instructions Dampers Evo1 Dampers Evo2 Dampers Evo3/CR40 How to setup your dampers? Maintenance / Inspection Your dampers Introduction BOS Engineering thanks and congratulates you on your choice of dampers for your competition car. Your new BOS high performance dampers are developed from our years of experience in official championship, on all type of surface thanks to our successful co-operation with winning. Our success and results gained in few years show the full and the exclusive implication of BOS Engineering in the research of performance. The BOS dampers you just bought are especially developed for your car and your type of race. The choice of our technical solutions, the quality of our materials, the precision and the care brought to the assembly operations allow your new BOS dampers to be an absolute weapon to win. You will find in this user guide all the information needed to get the best of your BOS dampers in term of mounting, setup or maintenance. This hand book talks about lots of subjects for which a private or professional pilot can be confronted to setup his set of damper. We wish you a good reading and hope this document will guide you in your life of pilot... Note : BOS Engineering never stop to increase the range of product in terms of design and quality. Therefore, while this user guide contains the main information and pictures of products, there may be minor differences between this guide and your BOS dampers. Mounting instruction Your new BOS dampers are designed to change your old ones or the standard road dampers of your car. Note the different point to check when mounting: 1) Remove the standard dampers See your car’s work shop manual if necessary. 2) Mounting of the BOS dampers Depending the type of car, your BOS dampers are designed with eyelet bearing / bearing or cartridge + strut. In every case, the mounting procedure is the opposition of the remote procedure. If some modification are required, your contact in BOS or you local authorized distributor will inform you in advance and guide you. 3) Top mounting Depending the division of the car, the regulation allows you or not to keep the original fitting points (see more detail in your car homologation document). The top mount is fitted on bearing (specific solid top mount) or same than original (silent bloc). In any case, ask advice to your contact in BOS or you local authorized distributor 4) Fitting of the reservoir body Depending the type of damper, the reservoir body must be fitted (for front and rear) on the wheel arch or inside the car (engine compartment or rear tank). In any case, clamp the reservoir body and keep accessibility for adjustment. BOS purpose in option some universal fitting support for an optimal clamp. (ask us) 5) Setting up your car Depending your vehicle and your division, the setup of your chassis can be different. The setup of the car must be adapted to the track surface, the grip conditions and the pilot. The next pages give you some indications on the standard adjustment of a car type 2 WD. • Ride height Generally, the ride height must be low by keeping the damper stokes (in the respect of the race regulation). The chassis of the car must lower at the front than the rear to keep a weight distribution to the front of the car. The ride height can generally be setting with the spring pre-load nut or the position of the rear torsion bar. • Camber To increase the surface of the contact between the tyre and the ground, the camber must be negative on a rally / racing car. This value should be close to -2° / -2.5° • Toe A rigid and well suspended car is a safe car easy to drive which accept this settings : - Front : between zero to slight toe-in to give sensibility in the steering wheel. - Rear : slight toe-in for stability. Generally, if you need to setup your front and rear axle with toe-out, it means that your car has got a bad equilibre or bad suspensions • Caster To have a auto-centering point effect and a better feeling of the front wheels, the setup must tend to get a maximum of positive caster (in the maximum of the regulation or the adjustment possibility). This value is between +3° and +6° depending steering wheel assistance or not. Note : all these informations are standard advices adjustments. Your car can may not accept these generality. For particular advices, contact your BOS contact or your local authorized distributor. EVO1 dampers Technical specifications Mono-tube hydraulic damper with shim stacks Full disassembly and re-build possibility Hydraulic graphs adjustable, pre-setting at the factory depending car and running condition Remote reservoir body with piston mounted on flexible hose Cylinder in calibrated steel, anti-friction treatment Rod �16 mm made in chrome steel Configurations: • Bearing / bearing (generally for rear suspensions) • Cartridge + strut in calibrated steel, anti-corrosion treatment Adjustment of the coefficient This range of dampers comes from the family of the one way dampers with one adjustment. This adjustment called coefficient modify the bump (entrance of the rod) and rebound (exit of the rod) in the same proportion. In fact, the damper becomes softer or harder depending the adjustment. WARNING The reference (0) for the adjustment (or clicks) of the dampers is the position full tight (clockwise). Count the number of clicks from this position, then unscrew. More the adjustment is unscrewed and more the damper is soft, its hydraulic force gets lower at a given velocity . The total number of clicks is often 24 but can vary plus or less depending type of dampers, or for a same model, depending type of car. Different type of coefficient adjustment 1 2 Picture 1 : adjustment with screw CHC on strut Picture 2 : adjustment with screw on eyelet / bearing Influence of adjustments on a Evo1 / CR20 force bump rebound velocity original graph influence of adjustment of the coefficient EVO2 dampers Technical specifications Mono-tube hydraulic damper with shim stacks Full disassembly and re-build possibility Hydraulic graphs adjustable, pre-setting at the factory depending car and running condition Remote reservoir body with piston mounted on flexible hose Cylinder in calibrated steel, anti-friction treatment Rod �16 mm made in chrome steel Configurations : Bearing / bearing (generally for rear suspensions) Cartridge + strut in calibrated steel, anti-corrosion treatment Adjustment of bump and rebound This range of dampers comes from the family of the 2 ways dampers with 2 adjustments. Bump adjustment: This adjustment setup the bump of the dampers (entrance of the rod) Rebound adjustment: This adjustment setup the rebound of the dampers (exit of the rod) WARNING The reference (0) for the adjustment (or clicks) of the dampers is the position full tight (clockwise). Count the number of clicks from this position, then unscrew. More the adjustment is unscrewed and more the damper is soft, its hydraulic force gets lower at a given velocity . The total number of clicks is often 24 but can vary plus or less depending type of dampers, or for a same model, depending type of car. Different type of bump and rebound adjustments Picture 1 : adjustment of rebound with screw CHC on strut 1 2 Picture 2 : adjustment of rebound with knob on strut Picture 3 : adjustment of rebound with screw on eyelet / bearing Picture 4 : adjustment of bump with screw on reservoir body 3 4 Influence of adjustments on an Evo2 / CR30 force bump rebound velocity original graph influence of bump adjustment influence of rebound adjustment EVO3/ CR40 dampers Technical specifications EVO 3 (CR40) Mono-tube hydraulic damper with shim stacks Full disassembly and re-build possibility Hydraulic graphs adjustable, pre-setting at the factory depending car and running condition Remote reservoir body in steel with piston mounted on flexible hose (Piggyback reservoir body in aluminium or on flexible hose, with membrane) Cylinder in calibrated steel, anti-friction treatment Rod �16 mm (�18 mm) made in chrome steel Configurations : • Bearing / bearing (generally for rear suspensions) • Cartridge + strut in calibrated steel, anti-corrosion treatment Adjustment of BH & BL + rebound This range of dampers comes from the family of the 3 ways dampers with 3 adjustments. The descriptions BL and BH mean “Bump Low” & “Bump High”, so low speed & high speed. Bump High speed adjustment (BH): This adjustment setup the bump of the dampers (high speed entrance of the rod due to a big choc for example) Bump Low speed adjustment (BL): This adjustment setup the bump of the dampers (low speed entrance of the rod due to mass transfer for example) Rebound adjustment: This adjustment setup the rebound of the dampers (exit of the rod) WARNING The reference (0) for the adjustment (or clicks) of the dampers is the position full tight (clockwise). Count the number of clicks from this position, then unscrew. More the adjustment is unscrewed and more the damper is soft, its hydraulic force gets lower at a given velocity . The total number of clicks is often 24 but can vary plus or less depending type of dampers, or for a same model, depending type of car. Different type of bump and rebound adjustments Photo 1 : adjustment of rebound with screw CHC on strut Photo 1 : adjustment of rebound with knob on strut 1 2 3 4 Photo 3 : adjustment of bump BH & BL with knob on piggy-back reservoir body Photo 4 : adjustment of bump BH & BL with knob on remote reservoir body and adjustment of rebound with screw on eyelet / bearing Influence of adjustments on an Evo2 / CR30 force bump rebound velocity original graph influence of bump adjustment low speed (BL) influence of rebound adjustment influence of bump adjustment high speed (BH) How to setup your dampers ? Introduction Before making your own adjustments, note that BOS recommended adjustments of your dampers (written on reservoir of each damper) are a liable start point which should agree to the majority of pilots in normal running condition. But you will probably need to adjust your dampers depending weather and track conditions. If this is the case, please read this following advises to prevent from mislaid when adjustments. How to do when testing and making adjustments When making adjustment, proceed by small steps one at a time of a maximum of 2 clicks, keeps notes and the results of the new adjustment. When you think to have some good results, make the test with the previous adjustment to confirm, and then adjust again to the new one. If the behaviour and the time confirm this new adjustment, you can valid it and note it. Be careful to test adjustments with the same running conditions (tyres, temperature, grip,...) and change only one adjustment at a time. Explanations of hydraulic adjustments Generally, all the effect of stability and response of the car are managed by the bump, while the rebound affects the traction and driving comfort. If your first sensation is to put the damper harder, always start to tight the bump in the goal to keep the maximum of traction given by a relatively soft rebound adjustment. But don’t forget to think about the setup of the chassis which is very important for the performance of the car. Recommended solutions Now tackle some particular points of the behaviour of the car which can be plus or less modified by the hydraulic of the dampers. This advises have not the pretension to be a miracle solution to solve a problem but ways to adjust to solve a known problem. IMPORTANT NOTE! The recommended adjustments of your BOS dampers always start from the position full screw which is the harder adjustment for the bump and the rebound. H Adjustments : Unscrew the adjustment gets it softer Screw the adjustment gets is harder S The indications BL and BH means “Bump Low” and “Bump Hard”, so bump low speed and bump high speed. << H : hard (screw) / S : soft (unscrew) >> • S (x) H (x) Glossary >> Do not change the adjustment Softer of x clicks, so unscrew of x clicks Harder of x clicks, so screw of x clicks Solution to... bottoming EVO1 EVO2 coefficient bump EVO3 / CR 40 rebound bump H bump L rebound F R F R F R F R F R F R H (4) H (4) H (4) H (4) • • H (4) H (4) H (2) H (2) • • Solution to... pumping / dribbling EVO1 EVO2 coefficient bump EVO3 / CR 40 rebound bump H bump L rebound F R F R F R F R F R F R H (3) H (3) H (2) H (2) H (2) H (2) H (3) H (3) H (2) H (2) H (2) H (2) Solution to... car sharp when decelerate EVO1 EVO2 coefficient bump EVO3 / CR 40 rebound bump H bump L rebound F R F R F R F R F R F R • H (2) • • • H (4) • • • • • H (4) Solution to... bad traction in longitudinal EVO1 EVO2 coefficient bump EVO3 / CR 40 rebound bump H bump L rebound F R F R F R F R F R F R S (4) S (4) S (2) S (2) S (2) S (2) • • S (3) S (3) S (2) S (2) Solution to... corner entry understeer EVO1 EVO2 coefficient bump EVO3 / CR 40 rebound bump H bump L rebound F R F R F R F R F R F R • S (2) S (2) • • S (3) • • S (2) • • S (3) Solution to... corner exit understeer EVO1 EVO2 coefficient bump EVO3 / CR 40 rebound bump H bump L rebound F R F R F R F R F R F R S (2) • S (2) • • • • • S (2) • • • Solution to... corner entry oversteer EVO1 EVO2 coefficient bump EVO3 / CR 40 rebound bump H bump L rebound F R F R F R F R F R F R • H (3) H (2) • • H (2) • • H (2) • • H (2) Maintenance & Inspection After every rally / race: wash externally your dampers with a non aggressive and non alkaline product, dry it and spay it with a soft and lubricate solver (type WD40). Every 300 – 500 km: Remove the dampers from the car, wash it and clean it then send it to BOS Engineering or your local authorized distributor for a Rebuild n°1. Once a year: Remove the dampers from the car, wash it and clean it then send it to BOS Engineering or your local authorized distributor for a Rebuild n°2. Your dampers This page is dedicated to the technical specification of your BOS dampers like the general information and the recommended adjustments. Your will also find the serial number of your dampers which must always be given to when you are in contact with BOS Engineering or your local authorized distributor. ZA du Mont Blanc 18, rue Maurice Caunes 31200 Toulouse • France T : + 33 (0) 534 25 33 66 F : + 33 (0) 534 25 33 60 [email protected] www.bos-engineering.com