01-15-2007, 03:55 PM
Stolen from a GRM. I ripped it out a while back and have been meaning to post it. Most of it is common knowledge, but I'm sure someone will benefit from it.
Corner Entry
Problem: entry understeer
solution a) soften front springs
solution b) soften front compression
solution c) lower front ride height
Problem: entry oversteer
solution a) stiffen front springs
solution b) stiffen front compression
Caution: Don't raise front ride height to deal with entry oversteer.
Important: Run front ride height as low as possible. While there should be no hard contact, it is okay for the car to lightly touch under braking or on bumps.
Corner Exit
Problem: exit understeer
solution a) stiffen rear springs
solution b) stiffen rear shock compression
solution c) raise rear ride height
solution d) stiffen rear anti-roll bar
Problem: exit oversteer
solution a) soften rear springs
solution b) soften rear shock compression
solution c) lower rear ride height
solution d) soften rear anti-roll bar
Caution: If the car works better when you raise the front ride height, the springs are too soft. If the car works better when you go lower, the springs are too stiff.
Mid-Corner
Steady state or mid-corner handling is affected more by the anti-roll bars than the shocks. In a car with zero front droop, setting the spring preload may be more effective than adjusting the front anti-roll bar although they work together.
Problem: mid-corner understeer
solution a) stiffen front springs
solution b) stiffen front anti-roll bar
solution c) increase front preload
Important: Mid-corner understeer is one of the hardest things for the driver to sense and understand. It requires a completely different fix than entry or exit understeer. In almost all cases, in fact, the fix is the opposite of what you would do for entry or exit understeer.
Corner Entry
Problem: entry understeer
solution a) soften front springs
solution b) soften front compression
solution c) lower front ride height
Problem: entry oversteer
solution a) stiffen front springs
solution b) stiffen front compression
Caution: Don't raise front ride height to deal with entry oversteer.
Important: Run front ride height as low as possible. While there should be no hard contact, it is okay for the car to lightly touch under braking or on bumps.
Corner Exit
Problem: exit understeer
solution a) stiffen rear springs
solution b) stiffen rear shock compression
solution c) raise rear ride height
solution d) stiffen rear anti-roll bar
Problem: exit oversteer
solution a) soften rear springs
solution b) soften rear shock compression
solution c) lower rear ride height
solution d) soften rear anti-roll bar
Caution: If the car works better when you raise the front ride height, the springs are too soft. If the car works better when you go lower, the springs are too stiff.
Mid-Corner
Steady state or mid-corner handling is affected more by the anti-roll bars than the shocks. In a car with zero front droop, setting the spring preload may be more effective than adjusting the front anti-roll bar although they work together.
Problem: mid-corner understeer
solution a) stiffen front springs
solution b) stiffen front anti-roll bar
solution c) increase front preload
Important: Mid-corner understeer is one of the hardest things for the driver to sense and understand. It requires a completely different fix than entry or exit understeer. In almost all cases, in fact, the fix is the opposite of what you would do for entry or exit understeer.
I Am Mike
4 wheels: '01 RAV4 (Formerly '93 Civic CX, '01 S2000, '10 GTI, '09 A4 Avant)
2 wheels: '12 Surly Cross-Check Custom | '14 Trek Madone 2.1 105 | '17 Norco Threshold SL Force 1 | '17 Norco Revolver 9.2 FS | '18 BMC Roadmachine 02 Two | '19 Norco Search XR Steel (Formerly '97 Honda VFR750F, '05 Giant TCR 2, '15 WeThePeople Atlas 24, '10 Scott Scale 29er XT, '11 Cervelo R3 Rival, '12 Ridley X-Fire Red)
No longer onyachin.
4 wheels: '01 RAV4 (Formerly '93 Civic CX, '01 S2000, '10 GTI, '09 A4 Avant)
2 wheels: '12 Surly Cross-Check Custom | '14 Trek Madone 2.1 105 | '17 Norco Threshold SL Force 1 | '17 Norco Revolver 9.2 FS | '18 BMC Roadmachine 02 Two | '19 Norco Search XR Steel (Formerly '97 Honda VFR750F, '05 Giant TCR 2, '15 WeThePeople Atlas 24, '10 Scott Scale 29er XT, '11 Cervelo R3 Rival, '12 Ridley X-Fire Red)
No longer onyachin.
