First, I don't know what a VY SS is! My guess - a Holden based car?

I was looking at the file. The {B4402} "Max IAC Steps" has been increased from the standard 310 to 365. {B4403} IAC Effective Area is also rescaled - but the maximum steps are still 310.

So, I guess they've increased the resolution of the IAC (smaller sized steps). Why ?? :?

What size throttle body does this vehicle have??

Thanks!
Cheers,
joel

Edit -> I have an ASA tune (GM) and the B4402 is set at 365. The B4403 is stock 78 mm Throttle Body IAC Eff Area.