XRAY T3 Set-up Book - Petit RC

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Downstops Downstops - THEORY front ride height REAR ride height Downstops limit how far the suspension arms travel downward, which determines how far upward the chassis rises. This affects the car’s handling (due to effects on camber and roll-center) and the ability of the tires to “follow” the track. The effects may change with the type of track and/or amount of grip available. More suspension travel (lower downstop value) makes the car more responsive but less stable; it is also typically better on a bumpy tracks or tracks with slow corners. Less suspension travel (higher downstop value) makes the car more stable and is typically better on smoother tracks. It is very important to have the same downstop settings on the left and right sides of the car. Downstops - EFFECTS OF ADJUSTMENT Front Downstops Higher front downstop value Lower front downstop value Rear Downstops Higher rear downstop value Lower rear downstop value · Decreases front chassis upward travel on-throttle. · Increases high-speed steering. · Increases “initial” on-throttle understeer. · Better on smooth tracks. · Increases upward chassis travel on-throttle. · Decreases high-speed steering. · Decreases “initial” on-throttle understeer. · Better on bumpy tracks. · Decreases rear chassis upward travel off-throttle or under braking. · Increases stability under braking. · Better on smooth tracks. · Increases rear chassis upward travel off-throttle or under braking. · Increases steering in slow corners. · Better on bumpy tracks. Downstops - MEASURING Initial steps Prepare the car as follows: · Shocks: Detach the shocks. · Anti-roll bars: Detach the anti-roll bars. · Wheels: Remove the wheels. Set-up components: Use the following set-up components: · Droop Gauge Support Blocks · Droop Gauge 1. Place the droop gauge support blocks on the set-up board, and then place the chassis on the support blocks. Make sure the chassis is solidly mounted on the support blocks so it does not move.
Downstops 2. Lift and drop the suspension arms so that they settle in their lowest positions. 3. Using the droop gauge, measure the downstop value. FRONT DOWNSTOPS Measure at the bottom of the front arms. Do NOT measure under the front C-hub. REAR DOWNSTOPS Measure at the bottom of the rear arms. Do NOT measure under the rear uprights. Positive numbers indicate the distance (in mm) ABOVE the level of the support blocks (or, above the bottom of the chassis). Negative numbers indicate the distance (in mm) BELOW the level of the support blocks (or, below the bottom of the chassis). Downstops - ADJUSTING Front downstops Increase Turn IN (CW) the front downstop screw so the front lower arm raises up slightly. Decrease Turn OUT (CCW) the front downstop screw so the front lower arm drops slightly. Rear downstops Increase Turn IN (or CW) the rear downstop screw so the rear lower arm raises up slightly. Decrease Turn OUT (or CCW) the rear downstop screw so the rear lower arm drops slightly.
Page 2 and 3: CONTENTS Setting up the XRAY T3 3 D
Page 4 and 5: SETTING UP THE XRAY T3 107715 Ride
Page 8 and 9: RIDE HEIGHT RIDE HEIGHT - Theory ri
Page 10 and 11: DROOP DROOP - Theory Droop refers t
Page 12 and 13: TRACK-WIDTH TRACK-WIDTH - Theory Tr
Page 14 and 15: CAMBER CAMBER - Theory - + camber C
Page 16 and 17: CASTER CASTER - Theory caster Caste
Page 18 and 19: TOE TOE - Theory toe in 0 toe out 0
Page 20 and 21: TWEAK TWEAK - Theory A “tweaked
Page 22 and 23: TWEAK Adjusting Tweak Using Spring
Page 24 and 25: oll center ROLL CENTER A “roll ce
Page 26 and 27: oll center adjusting front roll cen
Page 28 and 29: XRAY MULTI-FLEX TECHNOLOGY XRAY MUL
Page 30 and 31: SHOCKS Shock Absorbers Shock absorb
Page 32 and 33: SHOCKS Shock Damping Shock damping
Page 34 and 35: 34
Page 36 and 37: ANTI-ROLL BARS Anti-roll bars are u
Page 38 and 39: FRONT & REAR AXLES Solid Axles A so
Page 40 and 41: GEARING GEARING Proper gearing is o
Page 42 and 43: SHOCK BUILDING TIPS Building shocks
Page 44: The T3 Set-up Book may show previou

XRAY T3 Set-up Book - Petit RC

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