Fuck turning wrenches, I wanna go wheeling; Build and BS

Arcticelf

Head BFH Operator at Gray Man Fab
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Turns out the jokes on me.

Can anyone explain why that sketch has no applicability to the toyota IFS?

Hint: Theta(U) and Theta(L) are the UCA and LCA angles, respectively.
 

Arcticelf

Head BFH Operator at Gray Man Fab
Joined
Apr 23, 2019
Messages
725
Location
DelCo PA
I can't really follow the drawing that well. Looks like you are missing the spindle, 4 bar linkage design.
Close, this was an attempt at calculating the instant center for an arbitrary suspension position.

Unfortunately, the configuration in the sketch is not physically possible for the Toyota IFS.

Also unfortunately I spent 4 hours factoring and expanding polynomials before I realized that.
 
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Close, this was an attempt at calculating the instant center for an arbitrary suspension position.

Unfortunately, the configuration in the sketch is not physically possible for the Toyota IFS.

Also unfortunately I spent 4 hours factoring and expanding polynomials before I realized that.
is it because of the anti dive in the uca why it can’t happen?

Or because the ic goes from the outside the car to the inside? If this reason couldn’t you put some limits at infinity?
 

Arcticelf

Head BFH Operator at Gray Man Fab
Joined
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Messages
725
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is it because of the anti dive in the uca why it can’t happen?

Or because the ic goes from the outside the car to the inside? If this reason couldn’t you put some limits at infinity?
The relative lengths of the control arms forces the angles such that the IC will be either outside of the vehicle, or below line A in that diagram. So E=T-B, not E=B+T, as shown in that picture.
 

Arcticelf

Head BFH Operator at Gray Man Fab
Joined
Apr 23, 2019
Messages
725
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DelCo PA
Ordered new hub plates, I guess I'm committed to building spindles now.

The real question is: A arm or J Arm style UCAs? The latter have to have stronger mounts, since it's tension only, however more room for coilovers and potentially bypasses later.
 
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