23" tires on a RXV?

[SBIRD!]

I'm going to need new A/T tires soon. With the 350amp Curtis controller I have is running larger than 20" tires still a bad idea? I'd like the extra ground clearance but not at the risk of frying the controller.
I don't know of anyone in my area who could reprogram my controller. The local dealer put it in freedom mode and turned the reverse up a little after I installed it. Other than that I have no faith in them. Same folks who told me 2ga cables wouldn't fit and other such hogwash.

[molfpedal]

Originally Posted by SBIRD!

I'm going to need new A/T tires soon. With the 350amp Curtis controller I have is running larger than 20" tires still a bad idea? I'd like the extra ground clearance but not at the risk of frying the controller.
I don't know of anyone in my area who could reprogram my controller. The local dealer put it in freedom mode and turned the reverse up a little after I installed it. Other than that I have no faith in them. Same folks who told me 2ga cables wouldn't fit and other such hogwash.

You need to do a lift to go bigger than 20” on a RXV. In freedom mode you shouldn’t have to worry about a 350a controller. However, Bob Boyce is the man to give this question to. He could also reprogram your controller to insure that you would be ok.


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[SBIRD!]

[QUOTE=molfpedal;1823790]You need to do a lift to go bigger than 20” on a RXV. In freedom mode you shouldn’t have to worry about a 350a controller. However, Bob Boyce is the man to give this question to. He could also reprogram your controller to insure that you would be ok.

Thanks molf
I've got a 3" lift and thought that's enough for 23's from what I've read here.
Bob working his magic for me isn't going to happen unless I haul the cart down south to him. But Bob or one of the other RXV gurus may chime in and give a yea or nay.

[Buggieman18]

IIR, the magic max tire/wheel diameter the controller will easily forgive is about 21.5 inches. Beyond that there can be issues with current and speed mapping that could eventually lead to controller failure, but I don't recall the specifics. Bob Boyce has the precise info you need.

[SBIRD!]

Well Buggieman 21.5" would be some improvement on height so thanks. I'm still curious if the 350a controller without tuning could handle 23's if anyone knows.
I saw the thread about a possible programming trip by Bob to Virginia and thought hum, that's only a 7 hour drive.

[usgicollector]

SBIRD your going to need the torque turned up on that 350amp controller when going with 23" tires.

[Monstermaker]

Little-known secret: if you can find them, the differential gears from a Jacobsen Eclipse 322 mower are supposed to fit in the RXV.
They’re lower, 19.6:1 instead of the 17:1 stock ones.
They will compensate for larger tires, same way the truck guys use lower gears when installing larger tires.
I managed to score a set off eBay a while back but haven’t yet installed them because I’m still running stock tires.

[JohnnieB]

Originally Posted by Monstermaker

Little-known secret: if you can find them, the differential gears from a Jacobsen Eclipse 322 mower are supposed to fit in the RXV.
They’re lower, 19.6:1 instead of the 17:1 stock ones.
They will compensate for larger tires, same way the truck guys use lower gears when installing larger tires.
I managed to score a set off eBay a while back but haven’t yet installed them because I’m still running stock tires.

Just for grins, I plugged the numbers into my spreadsheet and and 23" tires with 19.6:1 gears is pretty much the same as 20" tires with stock gears (16.99:1).

Mathematically, the torque difference works out to 0.3%.