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Old 06-07-2019, 10:32 PM   #1
Dkep
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Default Express S4 speed upgrade

I’ve seen several old posts mentioning getting a passkey to unlock freedom mode and then using a handheld programmer to get another mph. Is anyone currently in the business of sending these devices through the mail? Or is anyone in the San Antonio area interested in speed tuning a 2017 express S4 in person? Thank you!
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Old 06-08-2019, 02:58 AM   #2
BobBoyce
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Join Date: Oct 2015
Location: TN/NC/GA Tri-state area
Posts: 3,952
Default Re: Express S4 speed upgrade

Quote:
Originally Posted by Dkep View Post
I’ve seen several old posts mentioning getting a passkey to unlock freedom mode and then using a handheld programmer to get another mph. Is anyone currently in the business of sending these devices through the mail? Or is anyone in the San Antonio area interested in speed tuning a 2017 express S4 in person? Thank you!
First, you need to know whether you have a 48V S4 or a 72V S4, as they are quite different.

Passkeys are not applicable to the 72V carts. They are AC drive, similar to the RXV, but use a real EV (Electric Vehicle) controller instead of a golf cart controller. EV controllers do not have a Freedom Mode option. Golf Cart dealers do not have the knowledge or equipment required to speed them up. Those that have tried, have ended up tripping a controller shutdown, or corrupted the controller. So be very careful about letting someone try that has no experience with those specialized controllers. You could end up needing to buy a new $2000+ controller.

The 48V S4 is a SepEx drive, and there is very little improvement available. The 48V pack is unable to drive the motor used on those to the kind of drive current required to speed it up by much. I managed to remap the motor maps on a 48V S4 to get a bit more speed, but the effort spent doing it was just not worth the result. The best option for that type of 48V S4 is to bring it up to 60V or 72V and go with an Alltrax SepEx controller.

I sent you a PM.

Bob
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Old 06-08-2019, 10:48 AM   #3
Dkep
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Default Re: Express S4 speed upgrade

Thank you Bob, I received the PM. You are incredibly knowledgeable! I have a 48 volt with 20 inch factory wheels. I though buying a stock “off-road” cart would be best for ease of upgrades and dependability. Its too darn slow in the beach community. I could always use some extra room for beach gear too. Looks like I have to decide if I should sell my S4 and start with a 6place cart. I like electronic and prefer to stick with it but can easily see why people all have fast gas carts around here!
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Old 06-08-2019, 08:01 PM   #4
BobBoyce
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Posts: 3,952
Default Re: Express S4 speed upgrade

Quote:
Originally Posted by Dkep View Post
Thank you Bob, I received the PM. You are incredibly knowledgeable! I have a 48 volt with 20 inch factory wheels. I though buying a stock “off-road” cart would be best for ease of upgrades and dependability. Its too darn slow in the beach community. I could always use some extra room for beach gear too. Looks like I have to decide if I should sell my S4 and start with a 6place cart. I like electronic and prefer to stick with it but can easily see why people all have fast gas carts around here!
Bummer that it's the 48V version, as the 72V version of that era can exceed 50 MPH if you're bold enough to hold the throttle down that long...
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Old 06-08-2019, 11:07 PM   #5
Dkep
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Default Re: Express S4 speed upgrade

Good lord that’s fast!
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Old 10-26-2019, 06:46 AM   #6
ALTSWEET
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Join Date: Nov 2018
Location: Western, NY
Posts: 5
Default Re: Express S4 speed upgrade

Quote:
Originally Posted by BobBoyce View Post
First, you need to know whether you have a 48V S4 or a 72V S4, as they are quite different.

Passkeys are not applicable to the 72V carts. They are AC drive, similar to the RXV, but use a real EV (Electric Vehicle) controller instead of a golf cart controller. EV controllers do not have a Freedom Mode option. Golf Cart dealers do not have the knowledge or equipment required to speed them up. Those that have tried, have ended up tripping a controller shutdown, or corrupted the controller. So be very careful about letting someone try that has no experience with those specialized controllers. You could end up needing to buy a new $2000+ controller.

The 48V S4 is a SepEx drive, and there is very little improvement available. The 48V pack is unable to drive the motor used on those to the kind of drive current required to speed it up by much. I managed to remap the motor maps on a 48V S4 to get a bit more speed, but the effort spent doing it was just not worth the result. The best option for that type of 48V S4 is to bring it up to 60V or 72V and go with an Alltrax SepEx controller.

I sent you a PM.

Bob
Bob,

What is involved with converting my S4 from a 48 to a 72v?
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Old 12-05-2021, 09:34 AM   #7
brandonm00re
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Default Re: Express S4 speed upgrade

Did you ever get info on converting 48v to 60 or 72 for this cart?
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