[Weirdosport]

You obviously don't know the format dini takes:

dini_Set(filename[], key[], value[])

In your case, I think you're after:

dini_IntSet(filename[], key[], value)

dini_IntSet(dinipath, "car", i-100)

EDIT: Previous posters solutions saves it as a string, mine saves it as an integer... =/ s'up to you.