Want to build a 35 MPH cart

[wizardket]

OK guys, I thinking on what it would take to build a 35 MPH max cart for use on county roads? I would use it to run around to the store, post office, etc. My next door neighbor is a CHP and will get me the check list for street legal.

• What would start with (Series, PDS, DCS)?
• What changes would you make?
• What voltage would you shoot for?

[dougmcp]

36v series cart converted to 48v, 8:1 gears, 700 amp controller, HD switch and solenoid should do it.
You mentioned CHP, if you're in California it will be hard to get your cart street legal without a real VIN number.

[wizardket]

Originally Posted by dougmcp

36v series cart converted to 48v, 8:1 gears, 700 amp controller, HD switch and solenoid should do it.
You mentioned CHP, if you're in California it will be hard to get your cart street legal without a real VIN number.

If I understand, a stock series motor is 2850 rpm @ 36v. 48v gives +25%, that would be 3500 rpm. Calculator gives that 24.1 mph with 18.5" tires. Am I correct that it would take a 27" tire for 35 mph?

[dougmcp]

Originally Posted by wizardket

If I understand, a stock series motor is 2850 rpm @ 36v. 48v gives +25%, that would be 3500 rpm. Calculator gives that 24.1 mph with 18.5" tires. Am I correct that it would take a 27" tire for 35 mph?

48v is a 33.33% increase (36v x 1.33 = 47.88v), makes a stock 2850 motor spin up to 3800 rpm.
I posted incorrectly before, add 6:1 gears and on 18.5" tires your speed would be 34.9mph. That being said, it is doubtful that a stock motor with 6:1 gears would have enough torque to get up to that speed.
The tire size increase would do the same as an axle ratio change and the torque would still be a problem.

[wizardket]

Originally Posted by dougmcp

48v is a 33.33% increase (36v x 1.33 = 47.88v), makes a stock 2850 motor spin up to 3800 rpm.

I know that to voltage increase is 33%. I heard form Scottyb that the increase in speed and torque was about 25% with the 36v to 48v conversion. Are you saying that the increase is linear?

[dougmcp]

Originally Posted by wizardket

I know that to voltage increase is 33%. I heard form Scottyb that the increase in speed and torque was about 25% with the 36v to 48v conversion. Are you saying that the increase is linear?

Theoretically, yes. Practically, it depends on the ability of your batteries, controller, solenoid, cables and FNR switch to deliver the power to the motor. The motor also has to be able to handle the power delivered.
Scotty's 25% number is a non-scientific, seat of the pants, practical experience, realistic number that is probably more accurate.

[wizardket]

Originally Posted by dougmcp

36v series cart converted to 48v, 8:1 gears, 700 amp controller, HD switch and solenoid should do it.
You mentioned CHP, if you're in California it will be hard to get your cart street legal without a real VIN number.

How much voltage can a 36v series motor take? How many watts before it melts?

[wizardket]

OK, so far I have the following:

• 96' TXT Series
• 6 X 6V T105 batteries - Will add 2 more in the Bag Well
• 480 Amp LGS controller
• #4 Wires to motor, 1/0 on the batteries
• HD Solenoid
• HD F&R Switch
• 18" Stock Tires
• Looks like a 19 spline motor
• Looks like a new rear end: 73500-G01 Date 10/26/07

I was looking at "The Assassin" - Model #PQ9231 but it is a 10 spline. Can the original motor be re-wound?

[PLUMQUICK]

Originally Posted by wizardket

OK, so far I have the following:

• 96' TXT Series
• 6 X 6V T105 batteries - Will add 2 more in the Bag Well
• 480 Amp LGS controller
• #4 Wires to motor, 1/0 on the batteries
• HD Solenoid
• HD F&R Switch
• 18" Stock Tires
• Looks like a 19 spline motor
• Looks like a new rear end: 73500-G01 Date 10/26/07

I was looking at "The Assassin" - Model #PQ9231 but it is a 10 spline. Can the original motor be re-wound?

You can get that style motor in an EZ-GO case...........I would go to 2ga. wire with this motor..........

[wizardket]

Originally Posted by PLUMQUICK

You can get that style motor in an EZ-GO case...........I would go to 2ga. wire with this motor..........

What RPM will this motor do on 48v?