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Thread: Suspension set up

  1. #1
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    Front spring rate increase:
    More under steer; increase in proportional weight transfer to the front when rear wheel rate is not increased; reduces front traction when rear rate is not changed.
    Usable adjustment: 150-600 lbs/in
    Symptoms of too much adjustment: terminal under steer; front of car hops in corners; excessive wheel spin on inside front tire on FF cars.

    Front spring rate decrease:
    Less under steer; decreases proportional weight transfer to the front when rear wheel rate is not increased; increases front traction when rear rate is not changed.
    Usable adjustment: 150-600 lbs/in
    Symptoms of to much adjustment: Too much over steer; over steer then under steer if spring is so soft that the car bottoms out on lean, car bottoms out excessively with a jolting ride.

    Rear spring rate increase:
    More over steer; increase in proportional weight transfer to the rear when front wheel rate is not increased; increases rear traction when front rate is not changed.
    Usable range: 100-600 lbs/in
    Symptoms of too much adjustment: too much over steer; sidestep hop in corners; twitchy; pretty scary.

    Rear spring rate decrease:
    Less over steer: decreases proportional weight transfer to the rear when front wheel rate is not changed; increases rear traction when front rate is not changed
    Usable range: 100-600 lbs/in
    Symptoms of too much adjustment: car under steers; if way to soft car under steers then over steers as car bottoms out on lean; car bottoms out excessively with a jolting ride.

    Front anti-roll bar stiffer: more under steer
    Usable range: none to 1.25 inches in diameter
    Symptoms of to much adjustment: terminal under steer; lifts inside front tire off the ground witch can cause massive wheel spin on FF cars; also not good for most effective tire usage as inside tire is now doing nothing.

    Front anti-roll bar softer: less under steer
    Usable range: none to 1.25 inches in diameter
    Symptoms of to much adjustment: overstate scary; more like fun

    Rear anti-roll bar stiffer: more over steer
    Usable range: none to 1 inch in diameter
    Symptoms of too much adjustment: Big-time over steer. Can cause inside rear tire to lift off the ground.

    Rear anti-roll bar softer: less over steer
    Usable range: none to 1 inch in diameter
    Symptoms of to much adjustment: under steer; slow and boring

    Front tire pressure higher: less under steer by reducing slip angels on most tires
    Usable adjustment: up to 55psi hot
    Symptoms of too much adjustment: no traction- tire crowned so more under steer; adds wheel spin in FF cars; jarring ride; center of tire wears out

    Front tire pressure lower: more under steer by increasing slip angles on most tires
    Usable adjustment: not less then 20psi
    Symptoms of too much adjustment: edges of tire wear quickly because tire is folding over; feels mushy; tires chunk because low pressure means heat build up.

    Rear tire pressure higher: less over steer by reducing slip angles on most tires
    Usable range: up to 45psi hot
    Symptoms of too much adjustment: no traction—tire is crowned so more over steer; bad wheel spin on FR cars; jarring ride; center of tire wears out.

    Rear tire pressure lower: more over steer by incresing slip angles on most tires.
    Usable range: not less then 20psi
    Symptoms of too much adjustment: edges of tire wear quickly because tire is folding over; feels mushy; tires chunk because low pressure means heat build up

    More negative camber front: less under steer because of better lateral traction as tread is flatter on the ground under side load.
    Usable range: up to 3.5 degrees negative
    Symptoms of too much adjustment: poor braking; car is road crown sensitive; twitchy; front tires wear on inside edge

    More negative camber rear: less over steer because of better lateral traction as tread is flatter on the ground under side load. More rear grip
    Usable range: up to 2.5 degrees negative
    Symptoms of too much adjustment: more over steer; car feels twitchy in back; tires wear out on inside edge; less breakaway warning when limit is exceeded.

    Ride height to low (typical beginner mistake): car is twitchy with unpredictable dynamics. Bump steer make you life miserable.
    Usable range: usually 1.5-2.0 inches lower then stock unless car has been modified to go lower.
    Symptoms of too much adjustment: everything that could possibly go wrong: sudden over/under steer; twitchy due to bump steer; very harsh ride; premature tire wear.

    Toe in – front: car is stable going straight. Turn in is average
    Usable range: 0-1/8th inch
    Symptoms of too much adjustment: car has slow twitchiness under braking; feels odd; kills outside edge of tires

    Toe out – front: Car turns in well; works pretty well on FF car as they tend to toe-in under load.
    Usable range: 0-1/4 inch
    Symptoms of too much adjustment: Car is really twitchy under braking; car wanders on straight road; kills inside edge of tire

    Toe in – rear: car is less likely to over steer when the throttle is lifted
    Usable range: 0-1/8th inch
    Symptoms of too much adjustment: weird, slow, rocking movement in back; feels slow but still unstable; wears outside edge of tires.

    Toe out – rear: Helps car rotate useful in low speed and slalom courses; very common on FF pro rally cars.
    Usable range: 0-1/8th inch
    Symptoms of too much adjustment: not to good for street driving; causes lift throttle over steer; makes violent side to side rocking motions in the rear; tie wears on inside more.

    Positive front caster: helps stability; suspension will get more negative camber when turning; reducing positive caster reduces steering effort. (Negative caster is not usable)
    Usable range: 4-9 degrees positive
    Symptoms of too much adjustment: can increase under steer especially in cars with wide low-profile tires. Can increase steering effort.

    Single adjustable shock stiffer: Better turn in; better transient response; causes slower onset of over/under steer by slowing weight transfer depending on what end of the car is adjusted.
    Symptoms of too much adjustment: suspension becomes unresponsive; ride gets harsh; car skips over bumps, loosing traction; Causes a big delay in weight transfer resulting in strange handling like under steer then late corner stage over steer.

    Single adjustable shock softer: slower transient response; quicker onset of over/under steer
    Symptoms of too much adjustment: car oscillates due to under dampened spring motion, like a boat. Car gets twitchy in turns. Feels unstable.

    Taken from
    and

  2. #2
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    thats some helpful info thanks mate

  3. #3
    Senior Member DRFTAE86's Avatar
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    should make it a sticky.

  4. #4
    Senior Member DRFTAE86's Avatar
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    I mean "pinned".

  5. #5
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    Decent amount of info, however a lot of the information is discussed as an individual adjustment. Almost all suspension adjustments are interdependent. Thus changing one effects the other.
    AE86 4AGE "Slowly but surely"

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