Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - Question About Negative Camber: More Negative Camber == More Grip at Corner?

ayau · 03-28-2014, 10:52 AM

So all else equal, if you lower the front of the car, you'd want to increase spring rate to minimize the LCA and the strut from being perpendicular under compression.

Assuming @ZDan's suspension model is accurate, the front keeps gaining negative camber up until 4'' of compression. However, that doesn't take into account body roll, which changes the angle of the strut. That 4'' of bump travel is actually less when you take into account body roll, right?

Then you also have to take into account caster, which can change the amount of camber when cornering. More caster equals more negative camber under bump. I'm sure there are other variables as well.

Correct me if I'm wrong, but it appears you want the front to be as stiff as possible when tuning macpherson struts (ignoring all other factors). From a pure performance standpoint (ignoring cost, packaging, etc), double wishbone appears to be the superior design. I guess that's why Formula One still uses it.

03-28-2014, 10:52 AM	#34
ayau Senior Member Join Date: Nov 2011 Drives: Some rust bucket Location: Polar ice cap Posts: 3,058 Thanks: 312 Thanked 1,045 Times in 556 Posts Mentioned: 37 Post(s) Tagged: 0 Thread(s)	So all else equal, if you lower the front of the car, you'd want to increase spring rate to minimize the LCA and the strut from being perpendicular under compression. Assuming @ZDan's suspension model is accurate, the front keeps gaining negative camber up until 4'' of compression. However, that doesn't take into account body roll, which changes the angle of the strut. That 4'' of bump travel is actually less when you take into account body roll, right? Then you also have to take into account caster, which can change the amount of camber when cornering. More caster equals more negative camber under bump. I'm sure there are other variables as well. Correct me if I'm wrong, but it appears you want the front to be as stiff as possible when tuning macpherson struts (ignoring all other factors). From a pure performance standpoint (ignoring cost, packaging, etc), double wishbone appears to be the superior design. I guess that's why Formula One still uses it.