Try Motonica for 1/8 on-road. Some says it's the Lambo of 1/8 on-road car and I could not afford to oposse that and here's the reason why?
Scuderia Motonica '12, the P81 RS2:
When it comes to performance, it's a beast too. I maximized my time, building, studying and figuring the right set-up for it to fit here in our track (local). I upgraded it with some updates except for the new kevlar belts and partnered with the best engine, Vox.
HTH. Cheers