Very pleased to hear this! There was a nice thread
on it a while back, which also discussed getting other games such as Lotus 3, Elite 2, Powerdrift and many others smoother too.
Only problem for me is, I can't get it to work. I use this file and boot from emulated floppy:
Stunt Car Racer (1989)(MicroStyle)[f AGA Galahad][h][Stunt Car Racer Turbo].adf
I have tried all number of combinations of chipset timing and CPU, but I can't get a smoother experience. If I try to press F3 during the game, it only makes the whole thing stupidly fast, which isn't the same thing as smooth.
Any ideas? I can't wait to see SCR at 60fps.