MM Hard field data

I am starting this thread for FIELD EXPERIENCE ONLY.

As many of you know I have one of Dave’s 4 dip switch do anything super duper MM’s. I use it to evaluate different setups with various motors, gearbox ratios, programming changes and tire sizes. I also use a GPS speedometer, and an IR LASER thermometer. Today’s goal is to provide a bit better than stock 25 MPH and be reasonably sure the set up will live.

Submissions to this thread should be ACTUAL field experience ONLY. Bad experience items have the same value as good ones.

2009 4 passenger with doors. 5HP heavy duty motor 23" tires 12.44 Gearbox… MM set on #2 30MPH 5450+/- RPM This setup will probably live. (I don’t like to exceed 5000 on stock GE motors but what the hell)

MM set #3 34+MPH 6360+/- RPM This setup will eventually fry the motor.

In the above the #2 setting gives 30 MPH capability and eliminates the bothersome 26 MPH speed limiter jiggy jog. To me the extra 5 MPH is all I need for the area I operate in.

I highly recommend Dave’s MM with the plug in programming feature. In the future, if you upgrade to a high performance set up, all you have to do is change the plug.

Mean while you have a pretty good chance your cart will live.

Also suggest the GPS speedometer 27 bucks on Ebay.


2007 E4 Owner didn’t like surging when hitting the over speed limit. MM #1.
stopped surging and added 2 miles an hour. Only affected speedometer/odometer by a mile.

This setting eliminated disturbing condition with no affect on reliability.

Approximate speed limit from 25mph base speed.
Keyed and dip switch model are the same circuit.

Actual test result:
No MM = 25mph
MM no jumper or switch activated= 26.6mph
Switch or jumper #1= 28.6
#2= 30.9
#3= 36.1
#3+1= 40.3
#3+2= 44.7
#3+2+1= 50.2
#4= 56.8

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Hi Inwo

how to buy these pm?

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.


MM 3+1 setting. 2009 E4 7HP GE motor 12.44 gears. With standard Settings for tire diameter and enhanced settings for performance hit limiter at 27 MPH

Added MM with 3+1 setting and set Speedometer to KPH got a reading of 34

Got GPS reading of 34MPH. This is winding the GE 7 too tight but shows the MPH accuracy of a 3+1 MM in the KPH mode

Dave can build this configuration in a standard package. This should apply to GE HD 5 (long 5) GE 7 and RFF, D&D, AMD, and Marlon motors. Does not work with the GE short 5 or GE 3.5 due to efficiency issues.

I recommend this set up for almost all MM setups.

NOTE: This unit will allow you to exceed RPM capabilities on STOCK GE motors so watch your speed. I suggest you don’t exceed 35 MPH with 10.9 gearbox and 30 MPH with 12.44 gearbox.


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2005 E2 standard setting for Gear Ratio (10.35) and tire diameter (23 inch,) high settings for armature current, Stock 5 HP short motor. Would hit 27 MPH and limiter would kick it down to 25

Changed out motor to 5HP heavy duty long motor.

Added Daves 3 Plus1 MM

Now 33/35 MPH reading on the KPH setting. Reads 1 MPH higher than GPS.

The standard short 5 doesn’t have enough beans to get past 29 MPH.

I recommend the 3 plus 1 for all applications. How ever restraint must be used with stock GE motors. 35 MPH with 10.35 Gear box and 30 MPH with 12.44


I have a 2015 with stock motor and stock gear box. Anyone know what motor or ratio I’d have? Would the 3/1 MM get my gem from 25 to 30-35 mph range?

Thanks Inwo! So do I have to buy this off of ebay or can I buy direct? Or email me at wolfeprop at hotmail dot com.

I can do better direct.
$75 for the MM-1+3 or $90 for adjustable or keyed that allows changing settings in the field.

Is 3+1 safe for the stock 5hp motor? I’m assuming (by your pdf) that I have the short version and Rodney states above that it’s better fit for the long 5hp, 7hp, RFF, ect.

I’ll defer to Rodney on what’s safe rpm.
As the 3+1 doesn’t limit before 40mph, it might depend on the driver to limit downhill speed.
Rodney doesn’t have hills.
If you get one of the adjustable models, you can try a more modest increase first.

The beauty of the 3 plus 1 is its ability to display MPH if the speedometer is set to KPH. It puts the responsibility on the owner to limit his speed to the capabilities of the motor installed. If you have a 10.35 gearbox with big tires GE motors will probably live to 35 MPH If you have a 12.44 my recommendation is stick to 30. If you want to stay on the safe side a #2 MM works well and you probably won’t blow your motor if you limit your self to reasonable stretches under full power.

The standard short 5 really doesn’t have enough power to destroy itself from high RPM so you can use any MM It will run to about 27 MPH actual on an E2. The limiting item on a short 5 with an MM is heat. Use common sense. A #1MM will give you the 27 MPH and eliminate the hunting of the speed limiter on T3 controller cars. It only affects MPH by about a mile and in hilly country your regen still can work.

How ever with all that being said IMHO the advantages of the 3 plus 1 make it viable in any application due to its ability to give close to actual MPH readings while being able to support 40 MPH in a suitably equipped cart. You just have to respect the RPM limitations of the GE motors.

You CAN have your cake and eat it too.


Thank you both! I do live in hilly Western PA so i was concerned with burning my little 5hp up in my E2.

Your concerns are warrented.


Has anyone done this MM mod on a Ford Think? Also, curious if there is an actual install manual of sorts. Visuals and instructions would benefit those looking to speed up their carts.

I see a lot of raw data and settings but this is all binary to me. Something in simple form please.

Haven’t got any feedback from a Think user. Works the same on any nev or golf cart, that limits speed by calculating motor pulses.
MM divides the pulses. Causing the controller to think (example) you are going 25mph when moving 40mph.
It will only allow more speed if car is capable. If your Think holds back at 25 mph, it’s a good candidate to gain a couple mph with MM.
It just plugs in. No wiring. Move it from car to car, or send it back if it doesn’t work for you.

I love the idea of plug n play. My only issue is the mph kph part. I don’t believe there is a way to switch it unless you program it in.