How fast does a golf cart go, and how to make yours faster

How fast does a golf cart go? A stock electric cart from the 1990s or 2000s does 12 to 15 mph. Most carts built since about 2010 will do 19 to 20 mph on the highest factory setting, which fleets usually turn off and private owners turn on. A low-speed vehicle, the federal class most street-legal carts register as, is built for 20 to 25 mph. Gas carts run 14 to 19 mph depending on the governor.

Making a cart faster is a ladder. The bottom rungs are free or close to it; the top rungs cost as much as a used cart. The motors and controllers overview explains how to tell which drive system you have, and that decides which rungs apply. Here is the ladder in order.

Rung 1: the speed code, free to about $150

If your cart is a Club Car IQ (DS from 2001, Precedent from 2004 to mid-2008) or Excel (Precedent from mid-2008, Onward and Tempo), or an EZGO PDS (2000 to 2009 TXT), the top speed is a number in the controller. Club Car speed codes run from code 1, about 8 mph, to code 4, about 19 mph, on both IQ and Excel carts; codes 1 to 3 are a free or cheap dealer change and code 4 is a paid code Club Car issues for your controller. PDS takes a handheld setting or a plug-in speed chip that lifts the cart from about 13 to about 19 mph.

A dealer changes the code for about $50 to $150, with code 4 at the top of that range. A speed chip is about $40 to $100 and plugs in under the seat. If your cart is one of these and it is doing 13 mph, do this and nothing else first.

Series carts, Yamaha DC carts and the EZGO TXT48 have no owner-changeable speed code. The Club Car, EZGO and Yamaha fitment pages say which system each year has.

Rung 2: taller tires, about $400 to $900

Top speed is motor rpm times gear ratio times tire circumference, and the tire is the only one of the three you can change in an afternoon. The stock 18-inch tire to a 22-inch is about 20 percent more road per motor turn, so 15 mph becomes about 18 and 19 becomes about 23. A 23-inch tire adds a little more.

The cost is torque, which you notice on hills, and clearance, which most carts need a lift for past 20 inches. The lift kit guide covers what fits without a lift and what needs one. The fitment finder will tell you the stock tire for your year.

Rung 3: a 400-amp controller, about $450 to $700

The stock controller limits current to 250 or 300 amps. A 400-amp programmable controller lets the motor pull harder from a stop and run out further on the flat: hills stop bogging and you pick up 2 to 4 mph. The stock motor handles 400 amps for the length of a normal climb. This is the rung most owners should stop at.

Buy the controller for your motor type: Alltrax SR or a Navitas series unit for series carts, Alltrax XCT or a Navitas shunt unit for sepex carts, which includes every Yamaha from the G19 on and the TXT48. Add a 400-amp solenoid and check the battery cables are at least 4 gauge. The speed controller guide matches controllers to carts and covers the programming.

Rung 4: a motor, about $450 to $1,200

The motor decides how fast the cart can turn the axle and how hard it can pull. A high-speed wind on a 400 to 500-amp controller takes a 48V cart to 23 to 25 mph. A high-torque wind does the opposite and suits a lifted cart on big tires in a hilly community. Either is a bolt-in on the stock splines, about two hours with the rear on jack stands.

Past 400 amps, buy the motor and controller together. A matched 600-amp kit at about $1,300 to $2,200 gets a 48V cart to 25 to 28 mph and the motor is wound to take the heat. This is also the only path for AC carts: the EZGO RXV and Yamaha Drive2 PowerTech take a Navitas AC kit that replaces the motor and inverter as a set.

Rung 5: a high-speed gear set, about $400 to $700

The differential ratio on most carts is about 12:1. An 8:1 or 6:1 gear set gives more top speed for the same motor rpm and the same amps, with a proportional loss of torque. On a flat Florida community cart it is a clean way to 25 mph. On a lake-town slope it will struggle from a stop. It is a transaxle job, about four hours, and usually paired with a high-torque motor to put the hill pull back.

Lithium: not a speed upgrade, but it feels like one

A lithium pack holds the same nominal voltage as the lead-acid set it replaces, so the motor tops out where it did. What changes is that the voltage does not sag: a flooded 48V pack starts the day at 51 volts and is at 46 by the end of a long run, and the cart slows with it. Lithium stays near 51 until it is almost empty. Add 300 pounds less weight and the cart feels quicker off the line and holds its top speed all day.

If the pack is due anyway, the 48V lithium page covers which packs fit. One thing to check if you also have a controller upgrade: the pack’s BMS continuous rating has to be above the controller’s peak, or it cuts out on hills.

Gas carts: governor, then an engine

A gas cart is governed to about 14 to 19 mph and the governor is adjustable within reason; a few mph is available for free with a wrench and the service manual. Past that, the stock 10 to 13-horsepower engine is the limit.

Vegas Carts sells conversion kits that mount a 22-horsepower twin, commonly a Harbor Freight Predator 670 or a Honda, on the stock frame with a matched clutch and exhaust. Kits are about $1,500 to $3,500 depending on the engine and whether it is included, and the result is a 30 to 35 mph cart that tows. It is a weekend job for someone comfortable with an engine hoist.

Brakes, steering and the rest of the cart

A cart built for 15 mph has drum brakes, no seat belts and steering that gets vague at 25. Every rung up adds speed the rest of the cart was not sized for.

Before a motor or a gear set: adjust the rear drums, replace worn shoes, and check the brake cables are not stretched. Over 22 mph, a disc brake conversion on the front is worth about $400 to $700. Fit seat belts from the seat belt guide and check the tie rod ends. And if the cart goes on public roads, the LSV page covers why 25 mph is where the legal class stops.

Which rung for your cart

Cart	Drive type	Start here	Then
Club Car DS 1995 to about 2000	48V series	Tires, Alltrax SR 400	High-speed series motor
Club Car DS 2001 to 2013, Precedent 2004 to mid-2008	IQ sepex	Speed code 4	Alltrax XCT 400 or Navitas
Club Car Precedent mid-2008 and later, Onward, Tempo	Excel sepex	Speed code 4 at dealer	Navitas 600A kit
EZGO TXT PDS 2000 to 2009	36V sepex	Speed chip	Navitas sepex, or a 48V conversion
EZGO TXT series	Series	Tires, Alltrax SR 400	Navitas motor and controller kit
EZGO TXT48 2010 on	48V sepex	Tires, Navitas TSX or Alltrax XCT	Navitas motor and controller kit
EZGO RXV 2008 on	48V AC	Tires	Navitas AC kit
Yamaha G19, G22, Drive (G29)	48V sepex	Tires, Alltrax XCT or Navitas 440	High-speed sepex motor
Yamaha Drive2 DC	48V sepex	Tires, Navitas DC	Navitas motor and controller kit
Yamaha Drive2 PowerTech AC	48V AC	Tires	Navitas AC kit
Any gas cart	Governed engine	Governor adjustment	Vegas Carts conversion

When to stop

Most owners are happiest at rung 3: speed code, tires and a 400-amp controller, for 20 to 22 mph and a cart that climbs. It keeps the cart inside the LSV range, inside most community rules, and inside what the brakes can handle with a service. Past that you are building a different vehicle, and the brakes, belts and steering belong in the same budget as the motor.