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Electric EZGO Electric EZ GO Marathon, Medalist, TXT and RXV. |
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06-22-2015, 11:11 AM | #71 |
Gone Wild
Join Date: Apr 2015
Location: NorCal
Posts: 708
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Re: Converting CC (Ahem) to Lithium Power
Loaded tire diameter is much different than unloaded. Revolutions per mile (or whatever distance) is a much more accurate figure to use.
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06-22-2015, 12:39 PM | #72 | |
Gone Wild
Join Date: Jul 2013
Location: Sacramento, CA
Posts: 204
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Re: Converting CC (Ahem) to Lithium Power
Quote:
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06-22-2015, 01:36 PM | #73 | |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Converting CC (Ahem) to Lithium Power
Quote:
Using a automotive type DMM with a tachometer function, driven by the speed sensor on my SepEx motor, the correlation between the measured motor RPM and the calculated motor RPM using tire height I found, is consistent with the speed reported by the Garmin GPS I use for a speedometer, so it is close enough for my purposes. |
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06-22-2015, 01:45 PM | #74 |
Gone Wild
Join Date: May 2012
Location: Rio Verde, Az
Posts: 7,125
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Re: Converting CC (Ahem) to Lithium Power
Make sure your tire is inflated to the PSI you plan to use because changing the inflation will change the effective circumference of the tire. This is a great method to calibrate things if you do it carefully.
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06-23-2015, 07:50 AM | #75 |
Gone Wild
Join Date: Jul 2013
Location: Sacramento, CA
Posts: 204
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Re: Converting CC (Ahem) to Lithium Power
I got home last night and jumped right into the cart to try out my new torque curve.
Don't think I quite have a great understanding of programming the Alltrax SPM72500 yet, cause as soon as I stepped on the GO pedal, the thing shot forward like the proverbial "bat out of hell" No wheelspin, but much quicker acceleration than the stock torque curve provided. As a matter of fact, too much…. The cart would get that herky jerky takeoff if I didn't mash the pedal to the floorboard. I think that on partial acceleration, my foot would bounce on and off the pedal giving that jerky takeoff. So back to the toolkit. I changed the torque curve until it resembled the original S curve. Then I played around with the throttle rate, kicking it up towards 50%. This gave me a little more control off the line. It allowed me to creep along slowly at partial throttle (kind of important when using the cart for its intended purpose) and then accelerate VERY quickly to my ball (to insure that perfect lie) Still have lots of experimenting to do. Would welcome any suggestions to how other SPM's have been programmed. Still need to fix the seat so it sits flush to the body. Then I'll calculate my tire diameter and go for a few high speed runs |
06-23-2015, 09:28 AM | #76 |
Techno-Nerd
Join Date: Jun 2011
Location: West Virginia
Posts: 19,654
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Re: Converting CC (Ahem) to Lithium Power
I don't know if it is adjustable in the SPM programming, but take a look at the Throttle Linearization curve.
What I ran into on my XCT is that the default curve was generating a throttle position signal the was greater than the physical position of the pedal during the first half of pedal travel. (Attachment-1) I adjusted it so the throttle position signal increases very gradually and the first half of pedal travel only invokes a 30% throttle signal. (Attachment-2) I've still got a lot of tweaking to do with the Speed, Torque and Linearity curves, but I think I'm getting closer to what I want. I don't actually do what is considered off-road, so I call it cross-country, but it is bumpy and my foot bounces on the pedal, so the cart was jerky because it only took a small movement on the top end of the pedal travel to produced a lot of acceleration. Now I can drive around my property at about 6 MPH without the need of a HANS device. |
06-28-2015, 12:19 PM | #77 |
Gone Wild
Join Date: Jul 2013
Location: Sacramento, CA
Posts: 204
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Re: Converting CC (Ahem) to Lithium Power
Just got back from my first test round of golf. Loaded the cart up with myself and a buddy and took the short blast up the road to the clubhouse. Hit 37.2 mph on the way up Then played a quick round of golf. Quite a few jackrabbit starts would throw my buddy right back into his seat. A lot of going back and forth to his ball meant I travelled a lot longer distance than I do during my normal round. Anyhow, at the end of the round, I still had 57% SOC which means that I used roughly 43% of the pack. If I drive a little more conservatively and play as a single, two rounds will be easy to get and possibly be able to squeeze out three.
So compared to my 84 volt cart with AC motor and regeneration, this cart uses a few more amps. It is not quite as quick off the line, nor as controllable, and the max speed is roughly 80% of the AC cart. However, for a little more than one third of the cost for controller and motor for the DC version vs the AC, it's quite a bargain Just as much fun on the course and still guaranteed to always have that perfect lie |
12-08-2015, 05:57 PM | #78 |
Getting Wild
Join Date: Dec 2015
Location: South Florida
Posts: 80
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Re: Converting CC (Ahem) to Lithium Power
Sent a PM to Ronncat to get some info on where he purchased all his stuff. Appears he does not visit thus website much.
He notes Elcon out of Sacramento, but i cannot seem to find the correct department. Anyone know where he purchased the main components |
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