Speed potential?

Stingray240CS

Hey Everyone,

I'm trying to help a friend determine the potential of his existing setup. He has a new EZGO TXT 48v cart with the 624105 motor and the Curtis 1206HB-5201 controller. He has 23x10-14 tires. It currently goes 19MPH.

I know Bob can do some awesome things with the RXV controller. Can anything be done with this TXT setup?

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BGW

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cgtech

Not much more speed left in that controller. Especially since its already likely not meeting it's current speed setting due to the large tires.

bronsonj

I have the TXT48 with 23" (high pressure) tires. On the stock controller with good batteries I hit 22 mph on a good long stretch.

I upgraded to lithium and on the stock motor/controller and a 57.6v lithium pack the cart was very much livelier much better acceleration and was quite happy to hold speed on mild hills where it would loose speed before. I did not GPS the speed on stock controller with lithium pack.

I upgraded to the Alltrax 300 amp controller (which is the smallest one available from Scotty) and I tell you I have been VERY happy. On the higher voltage and reduced weight the controller and cart runs really well. I have the cart limited to 5,800 rpm or 5,600 rpm (can't remember which) and it will scoot up to 31/32 mph! From personal experience you really don't want to go above 29. My TXT on 23's is happy at 29 and is freaky at 30+... Your Mileage May Vary.

Stingray240CS

Thanks for the quick replies. I was hoping to be able to get him up to 25, but it sounds like that's not an option.

I have a 36v and it's faster than his. I do have Scottys 500 amp alltrax and an upgraded motor though.

So do you guys think he should do to get to the 25MPH mark? Controller, motor, both?



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BobBoyce

With stock tires that cart should hit 19.5 MPH! With 20.5" tires and my programming, it could hit 24 or 25 MPH

The biggest problem is that putting 23" tires on a TXT48 with the stock controller rapidly maxes out the controller due to the loss of torque caused by the motor trying to turn such a large set of tires. I can increase torque by 28% and speed by about 5%, but most of the torque gain will be wasted trying to compensate for the torque loss of the tires. The batteries will be stressed more, and losses in the high current cables will be high. It'll really need a 2 guage cable set.

Otherwise, start shopping for an Alltrax 400 or 500 Amp controller to drive those tires.

Mduvall219

does he have it on freedom? i have similar setup with txt and i get 23 steady and top out 25 on long straight stretches

Stingray240CS

Thanks for that info Bob. It's getting about 19MPH as it sits right now. I'm not sure if it has freedom mode or not. He called and they told him it was programmed to go 19.

I told him I though it could be programmed since it was s curtis, but I may have been thinking of the RXV.

Bob, if all he is looking for is 25, do you think your programming would provide that extra 6 miles per hour? He just spent about $7000 on this cart so I know he wouldn't be too excited to spend a lot more on a new controller plus any other items needed to support the controller.

I could help him make some 2 gauge wires for the batteries and motor.

JohnnieB

I've never knowingly seen a TXT-48, much less laid hands upon one, but from what I gather by the posts I've seen on this forum the max speed for a completely stock TXT-48 on level pavement is 19.5MPH, which means the controller is limiting the motor at 4530RPM.

Apparently the stock TXT-48 motor has enough residual torque at the high end to spin at the 4530RPM limit imposed by the Curtis 1026HB controller with 20.5" tall tires if they are the high pressure type (20PSI or more max inflation pressure) and have either turf or road tread patterns, so the cart's top speed goes up to 22.2MPH or so. The 2.5" increased tire height effectively reduces the torque available where rubber meet road by 12.2%, so the stock TXT-48 motor must have had at least 12.2% more high end torque than needed to turn the stock height (18") tires when the controller induced RPM was reached.

With 23" tall tires, the torque reduction is 21.7%, which appears to be more than the residual high end torque the motor posses and it will no longer reach the 4530RPM limit imposed by the controller and cart will not attain the theoretical 24.9MPH the change in tire circumference predicts.

In addition, low pressure tires take more torque to turn than high pressure tires and aggressive tread patterns have more rolling resistance that turf or road patterns, so the cart will be even slower.

Bottom line: While beauty is in the eye of the beholder, speed is dictated by the laws of physics.

cgtech

Maybe it's not in freedom mode? Just how good is the "dealer"? Tell him to air up his tires once for a speed run, to 15-20 psi (most offroad tires wont do "handling" well at higher pressures, and will wear out fast, so dont leave them that way). Just an idea to see what might be holding him back, and his current setup is likely what's holding him back. He likely needs a serious upgrade program "$$"....

Lots of people & cart shops sell carts that look really cool, but dont perform worth ****, I usually end up breaking their hearts/wallets when they find out what it really takes to "perform as good as it looks". I've seen this one so many times. Craigslist "deals" & "penny pinchers" on buy-in price usually are left unsatisfied with their "great deal".
Its funny when they get mad at me for quoting what it really needs, I'll have no problem sending it back "as-is". But it's a shame they got less than they wanted (either by crooks, or penny-pinching). I aim to satisfy.

BobBoyce