It dominates that 650pp race. The Indy race is my money maker. You don't No need to coach Bob at all UNLESS the Mclaren f1 GTR shows up on the list. It will easily beat the Mclaren with coaching. But if you leave it alone from the start, once Bob overhauls all the other cars he will need to be paced up to bridge the huge gap the Mclaren put on any of the cars that typically load in 2nd place i.e. Zonda, Ford Gt spec, GTR Proto etc. If you don't pace him up you will come in 2nd to the Mclaren.
Also if you get the top two cars loaded to be close in performance they will push each other hard for a few laps widening a huge gap that Bob will need help pacing up with to catch them.
As long as I don't see Mclaren or a closely matched duo in 1st and 2nd place I just push start and let Bob destroy with the 2J. If it's one of the headaches loaded then I just coach a few laps till he is on their butts and leave him to do his thing and I go back to surfing on the web.