Bumps and Jumps RC Speedway

www.bumpsandjumpsrc.com


 
 
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The Handling Guide

Directions: Do one of the following change to your vehicle at a time and drive test.
Keep good notes (It's hard to do at the track but try to keep a log it really helps).
Also, don't forget to have fun....

Phase 1 (going into the turn)

If the vehicle is loose at turn entry then..(needs more traction)

(1) Right front spring is to soft use a harder spring
(2) You need to add more crossweight - by adding a round to the right front spring (add weight to the left rear tire).
(3) Change left front spring to a softer spring.
(4) Lower chassis - keeping it level with the rear.
(5) Reduce front right caster (no less than 2 degree min.)

OR If the vehicle is pushing into the trun entry then..

(1) Right front spring needs to be softer.
(2) You need to reduce the crossweight - by taking out a round to the right front spring (add weight to the front left tire)
(3) Increasing right rear spring tension by one round
(4) Increase front right caster (6 degrees max.)

Phase 2 (the middle of the turn)

If the vehicle is loose in the middle of the turn then...(needs more traction)

(1) Increasing the crossweight by adding a round to the front right and left rear evenly (add weight to the left rear tire)
(2) Use a harder spring to the left rear
(3) The right rear spring needs to be decrease a round (less spring tension)

OR If the vehicle pushes in the middle of the turn then...(needs more steering)

(1) Decrease crossweight by taking out a round to the front right and left rear evenly
(2) Use a softer spring to the right rear
(3) The right rear spring needs to be increase a round (more spring tension)

Phase 3 (coming out of the turn..)

If the vehicle is loose coming out of the turn then..(needs more traction)

(1) Stagger needs to be decreased on the right side
(2) Increase crossweight by adding a round of spring tension to the right front and left rear evenly (add weight to the left rear tire)
(3) Check if right rear spring tension is to much - if it is then take a round out of spring.
(4) Decrease rear springs evenly to the right and left rear.
(5) Use a soft tire in the rear

OR If the vehicle pushes coming out of the turn then...(needs more steering)

(1) Stagger needs to be increased on the right side if present.
(2) Decrease crossweight by reducing a round of spring tension to the right front and left rear evenly (add weight to the front left tire)
(3) Increase right rear spring tension a round.
(4) Increase rear springs evenly to the right and left rear.


General Glow Plug Information

OS Glow Plug Information

# 8 Hot Recommended for most current O.S. (and other) 2-stroke engines
A5 Cold Recommended for most current O.S. (and many other) 2-stroke engines particularly for 1/10th & 1/8th scale off-road car engines
A3 Hot Dependable O.S. quality makes A3 the most durable and longest-lasting glow plug available at an economical price
R5 Very Cold Recommended for high-nitro fuel and high r.p.m. engines, particularly 1/8th track racing car engines

McCoy Glow Plugs with OS Equivalent

MC-8 Medium Hot #8
MC-9 Cold A5, R5
MC-55 Medium Hot A3, #8
MC-59 Hot

STD ROSSI GLOW PLUGS BI-TURBO GLOW PLUGS

R1 Extra hot - RB4 Hot
R2 Hot from - RB5 Medium
R3 Medium - RB6 Cold
R4 Cold - RB7 Extra cold
R5 X-cold - RB8 Super cold
R6 Cold nitro
R7 Cold
R8 Cold FOR R15
G1 Hot

Your glow plug temperature range is too cold when:

  • The engine power is weak or has weakened from previous levels.
  • The engine slows down considerably or stops after removing the glow plug battery, despite correct adjustment of the needle valve. For example if an os5 plug gives you these problems in your engine, switch to an os8 plug instead.

Your glow plug temperature range is too hot when:

  • The engine suffers from pre ignition and loss of power.
  • The overall engine running is rough
  • The glow plug filament is broken or collapses frequently.

example if an os a5 plug gives you these problems in your engines, switch to a os r5 plug.

HOT GLOW PLUGS (for low nitro fuels)

Fireball: Hot (1.2-3.0V), and S-20 R/C Long
McCoy: MC 59
O.S. Engines: # 0, # 1, # 5
Rossi: R 1 (extra hot), and R 2

MEDIUM GLOW PLUGS (for 10%-15% nitro fuels)

Fireball: Standard (1.2-2.0V)
McCoy: MC 8
O.S. Engines: # A 3, # 8
Rossi: R-3

COLD GLOW PLUGS (for high nitro; 25% +)

Fireball: Cool (1.2-1.5V)
O.S. Engines: R-5
Rossi: R 4 (cold), and R 5 (extra cold)