From the searching around I have done on the EPS it appears that at low speeds the motor can draw as much as 50 - 60 amps in low speed maneuvering. If your doing a weekend of short low speed auto cross I would just monitor the voltage on the battery and see how it's handling it.

Granted your car has all the basics of a modern car, electric fuel injection, fuel pump, engine management and spark control along with the electric power steering.

If your battery voltage drops the engine management system will let you know.