NOR-CAL General Chat.

[mbonanni]

Gotcha, torque theory.

Now I can tell all my friends who ask me. Thanks. With all that said I love my settup.

[Wh33lhop]

you know they are actually the same rate at the hub.
the front is 1to1 ratio

Not quite, actually. Due to the caster and camber the front springs don't sit perfectly vertical, so the motion ratio of the front is around .9

Therefore wheel rate at the front with 550# is more like .9^2 * 550 thereabouts 450#/in

[kronus]

what the heck is Torque Theory

[mbonanni]

I may have the wrong name for it, but it basically deals with the amount of a certain force needed to move an object around a pivot point.

This also has torsion springs included in the equation causing resistance...

Someone correct me if I am wrong... I got a C in my AP Physics class. lol

[Thizzelle]

cab I thought you had an 'E'

[Cabriolet]

Not quite, actually. Due to the caster and camber the front springs don't sit perfectly vertical, so the motion ratio of the front is around .9

Therefore wheel rate at the front with 550# is more like .9^2 * 550 thereabouts 450#/in

i think you are a bit off, since caster should be 10 degrees and camber is ~2 degrees. giving your that (1-.12)=.88. but then you need to add in that that is toward the direction if travel. making it's effectiveness slightly higher

[Cabriolet]

cab I thought you had an 'E'

i do, but my pimp car is an 325i ;)

I may have the wrong name for it

vector multiplication

[kronus]

I may have the wrong name for it, but it basically deals with the amount of a certain force needed to move an object around a pivot point.

This also has torsion springs included in the equation causing resistance...

Someone correct me if I am wrong... I got a C in my AP Physics class. lol

that's not Torque Theory, that's regular old torque.

[rob&e30]

yooo!

[mbonanni]

vector multiplication

This doesn't sound right.

that's not Torque Theory, that's regular old torque.

So Regular Old Torque Theory. :p

[Thizzelle]

that's not Torque Theory, that's regular old torque.

LOL! I guess you can call it a theory.

[kronus]

it's not a theory dammit! that word means something!

[mbonanni]

it's not a theory dammit! that word means something!

[Wh33lhop]

but then you need to add in that that is toward the direction if travel

It is actually pretty complex if you want to accurately model it, but the gist is that the caster and kingpin angle inclination (the wheel is at a different camber angle than the spring/shock) mean the wheel has a slight mechanical advantage on the spring/shock. It changes a bit due to ride height and wheel offset as well.

[Bimmerman325i]

Jack the car up, measure wheelhub->ground height and spring perch->strut top height, lift wheel two inches from ground, remeasure spring perch to strut top hight, divide the two, bam motion ratio. It isnt 1:1, but it is a lot closer in front than rear.