Better wheels for autocross help

[Toyota GT 86]

Hey guys, this is going to be my first autocross with my gt86.

I have 2 set of different wheels, and i dont know which one are better for autocross.

The first set are the original 16' wheels with 205/70 original yokohama tires.
The second set are 18' Work Emotion Ultimate wheels with 235/40 goodyear asymmetric tires.

What is better for autocross? Fo better results ? My original set of 16'? Or my 18' work wheels?

Thanks.

Also can anybody help me about racing with trc off, vsc sport or normal mode?

Thanks alot and sorry about my pooor english.

[celica73]

i would go with the 18's in this case. I would also disable stability, etc (hold the trac button for 5 seconds).

[Toyota GT 86]

Originally Posted by celica73

i would go with the 18's in this case. I would also disable stability, etc (hold the trac button for 5 seconds).

Why 18 instead of 16?

[celica73]

Originally Posted by Toyota GT 86

Why 18 instead of 16?

Nothing against the 16's, it's the 205/70 tires (if that isn't a typo) that will kill you. If you meant 205/50, that might be a different story, even then, autocross tends to favor maximum grip and the 18's with wider sticker tires offer more grip.