3 replies to this topic

[wegmann]

Where can I find some data on how much the tire grip drops off with load? Anything specific to F1 would be perfect, but anything using somewhat similar-spec racing tires will probably do well.

Thanks!

[Greg Locock]

I haven't checked it thoroughly, but the following website has a relevant graph

http://members.xoom....aforo/epcjk.htm

Don't worry too much about the preceeding maths. The Pacejka formula is basically a multidimensional curve fit, used to give a good fit to experimental data in handling models such as ADAMS.

The critical point is that (normally) the total lateral thrust from a pair of tyres drops as the weight is transferred across the car, for a given slip angle. These graphs are more meaningful in F1 than in other suspension setups because suspension travels and hence camber angles are so small.

[Ben]

http://www.avonracin.../tech/dload.asp

Lots of data there. You'll obviously have to find the max values for each curve and then plot them against the vertical load to find the load sensitivity.

I got sent the F3000 data by someone before it appeared on the Avon site and have used the F3 data a lot to understand the MRA non-dimensional tyre modelling method.

Ben

[wegmann]

Excellent information! A VERY big thank you.