A bit of history.
Golf carts became available shortly after World War 2.
Ever since they were introduced there was a certain cadre of people that looked at them and thought Hmmm This looks like fun, but the things are too slow.
Enter the modern world of Electronic Control to the Golf carting world. Electronic control increased the range of the cart by eliminating the inefficiencies of the previous tapped resistance coil method. Speeds went from 11 MPH up to 20 MPH. Guess what? I WANT TO GO FASTER!!!
The first GEM prototype was built in 1996. It entered series production late in 1997 as a 48 volt unit. In late 1998 it was upgraded to 72 volts. These carts had a 3.5 HP motor and were set up for 25 MPH. Guess what I WANT TO GO FASTER!!!
During this period Ride For Fun, MZ Motor Sports and others developed kits consisting of Performance Motors, Controller Programming, and 4 pole tachometer magnets to replace the standard 8 pole unit. This Magnet provides a pulse signal to the controller. The Controller uses this signal to provide speed and distance information .
The Controller is programmable and after 2004 limits speed to 25 MPH. (T1 and T2 controllers used on 1998 to 2004 had no top speed limit.
Starting in 2005 things changed. The Hi Speed 4 pole magnet became popular for GEM carts. The performance people were HAPPY HAPPY HAPPY. Ride for fun and MZ Moter Sports sold kits with Motors Magnets and Programming to enthusiasts and speed jumped up to 40 MPH. These kits were/are sold to guys for DIY installation.
There are a huge number of owners that would like a little more than 25 MPH but don’t want to make physical changers to their cart.
2014 enter the MAGIC MAGNET or MM for short. Dave Bissen (INWO) developed a electronic plug in unit to replace the 4 pole magnet. It requires no mechanical work. It plugs in between the motor tachometer and controller plugs. 30 seconds is all it takes to install or remove. This fools the controller and adds 4 to 5 MPH without programming changes. This is a very popular item.
2016 due to enthusiasts requests Dave designed an adjustable unit that provides multiple steps. This unit is available in Dip switch and Jumper adjustment versions.
The advantage these units provide is an adjustable pulse rate to fit the performance level required by the owner and limit possible damaging motor over speed.
I have determined that the #2 setting is right for stock carts and you can reasonably (not positively) expect stock motors to live no matter how you alter the programming. With this setting your speedometer still works (reads a bit low) and regeneration is still available.
Dave provides fixed setting (#2) units for my rebuilt stock carts. I option my customers one with each unit I sell.