Rolling Resistance influence

[ilmir]

Hello, I would have a question if somebody has a link to a theory how static camber and toe influence the rolling resistance on a road car driven on tarmac.
thanks for your help.

 

[GregLocock]

You should be able to work out the sideforce thrust effect from geometry. There may be other second order effects, I have not seen those discussed.

Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[cibachrome]

Static camber and toe on both axles affect rolling resistance in their effect on net axle slip and camber angles. These are the operating angles, not the static settings. Drive torque, aero lift, payload, etc. change running toe and camber. This is all verifiable in a coastdown test and is routinely tested by manufacturers to get the optimum settings (usually not optimum for anything but fuel economy). Tire force & moment offset factors also play into this as afar as plysteer, plyrat, etc. are concerned. These affect road crown holding, headlight aim, and steering lead and pull situations, too. These factors are tire brand, construction, wear state, and pressure sensitive, so the marriage of suspension type, geometry specification, tire properties, road feel and fuel economy is surely one made in Hell. (That's actually a small town in SE michigan I've been to many times).