IRS Angles
IRS Angles
(OP)
I've searched but didn't find anything. I was wondering what kind of effect that angles such as SAI and caster have for the rear suspension. I've heard that they don't really matter but I still want to know if they have an effect at all. If you have any other information go ahead and add it, you can't have too much information.





RE: IRS Angles
Not too sure I agree about SAI, what do you mean exactly?
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: IRS Angles
As for the caster, is whether it's positive or negative the same veiw as with the front of the car (positive to the rear) or does it change to where positive is towards the cabin? How does the negative caster react with your car Mr. Locock?
RE: IRS Angles
IRS KPI doesn't matter, that provides camber from toe, and there is so little toe that the KPI doesn't make much odds.
rear suspension kinematics ARE important, as is the compliant behaviour, but the angle in both views of the spindle steering axis is relatively insignificant.
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: IRS Angles
RE: IRS Angles
RE: IRS Angles
For the kinematics think about your bump steer curve, GRCH, camber curve, semitrack gain. Everything else is second order stuff.
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: IRS Angles
I'm toying with a problem where I have to use same wishbones both on front and rear suspension, and am a bit at loss as what I should try to achieve.
RE: IRS Angles
Cheers
Greg Locock
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RE: IRS Angles
RE: IRS Angles
Roughly put...
as for the load of the suspension, it happen in different ways depending on the direction in which it occurs, like acceleration, braking, cornering, etc. But in general, we may reduces the forces on the joints and upprights by giving them a more centered possition in the wheel.
It is also important that the load describe a straight line within the tubes of the A-arms and ball joint bearing centre.
Goran
RE: IRS Angles