I managed to get it first time last night, everybody is flocking to use the same tune so they all finish at the same time. I just gave mine a little more kick off the line and won a couple of races quite easily.
It's actually a very fun car with the stock engine upgraded, I stiffened it up a bit and gave it 4WD, seems to make a great little cross country car.
I'm loving the new 911 at the moment, I've got a couple of different variations set up. One with the GT2 engine at stock to make a nice little cruising car, some others with the 918 engine for the full pelt around the map fun.