Not sure if this has been posted here or not but it is a good write up for something to do when the weather does not require wipers.
http://atlanticz.ca/zclub/techtips/wipermotor/index.htm
240Z wiper motor upgrade by BrandenZ
Re: 240Z wiper motor upgrade by BrandenZ
Another wiper motor swap; the Mazda piece appears to need less DIY, but either will be better than stock slow/slower.
DQ Volume 8 Issue 2 - Mazda Wiper Motor Conversion
DQ Volume 8 Issue 2 - Mazda Wiper Motor Conversion
Because when you spend a silly amount of money on a silly, trivial thing that will help you not one jot, you are demonstrating that you have a soul and a heart and that you are the sort of person who has no time for Which? magazine. – Jeremy Clarkson