Convert from the Navitas 600 and 5KW to the 800 and 7.5KW.

[cart12]

Originally Posted by CC018

Right now I see cruising speeds of 35mph, top speeds of 40mph and good acceleration but as a lifelong gearhead I'm always looking for more.

Is it safe to assume you (or your passengers) have not experienced a panic stop on your cart at 30+ MPH?

[CC018]

Originally Posted by Noonan

Somewhere in the 45-48 mph if i remember correctly.

Thank you for that information. I’m getting 35-40 mph now with the 48v battery. Still trying to decide if I want to go further or run it as is for a while. I’ve only put about 70 miles on it as it is.

[CC018]

Originally Posted by cart12

Is it safe to assume you (or your passengers) have not experienced a panic stop on your cart at 30+ MPH?

I have experienced a panic stop at 35mph. I’m a lifelong gearhead that’s broken more transmissions, rear axles and axles shafts than many can imagine. I also have a turbo charged 175 hp motorcycle.

[cart12]

Originally Posted by CC018

I have experienced a panic stop at 35mph.

Can you please do it again and post a video for us?

[CC018]

Originally Posted by Imapled

I would want a 24s1p 600A continuous and 1000A peak for 30s battery for that setup. Batteries are the power source not a traction setup that "uses" power (watts). So, without the proper battery to meet the demand that setup won't do much more than a 440A on a 4kW motor.

No commercial off-the-shelf battery can supply the needed power (watts) to drive that system. You will need a custom battery to reach full potential or two commercial offerings in parallel at 72Vdc nominal for each.

Then the real issue is the Granzi (or Dana/Spicer) rear end. They are not made for that torque. They are golf carts and much smaller motor setups. You will grind your differential if not setup correctly at full power of 2x 72Vdc commercial batteries. So, your next limit is what the differential can actually handle.

Full power full send a few times at max settings and you will strip input or worse blow a gear and shoot it out the side of the differential. If you have an under power battery you will just be configuring down the inverter to meet the batteries maxes and you should have just got a 440A 4kW setup instead because you are configuring most setups down to that if you don't have the battery. Then you will configure down so you don't blow up your differential... strip hubs... etc... That is a lot of torque for a little golf cart axle.

Its all math... No magic.

Battery + Differential is the limiters. I have a 11kW motor that can slip right on to a Dana/Spicer from SME (DanaTM4) but, it if I power it fully it will just shred a wimpy golf cart axle.

Then, you have the open differential... if you are doing something like this then you should get a proper locker for the rear so you don't make a one wheel wonder and st

The whole "Powered By" marketing from motor companies is puzzling. Batteries provide the power... Motors use the power. I guess you could say it is "Powered By" the motor when you have regen kicking in. ;)

Its not worth the money to upgrade to a motor setup that your battery can't supply fully or your differential can't handle...

I have a 11kW AC Induction motor and a 144Vdc inverter at 400A to drive it with but, it will just shred a golf cart axle. Needs a proper Ford 9" custom rear to actually work and then there is the problem with the fact its a freaking golf cart and a death trap with that much power.

All good points but you aren’t having fun until you start breaking things. ;)

From the archives. My 42 MB from 1980. I built a custom 2,000 CC turbo charged nitrous injected engine that produced 600hp that would literally fly. Of course I broke every part of the drivetrain until I eventually changed everything from trans, transfer case and both differentials.

[simicrintz]

That pic is from the way back machine; look at those 3 wheelers!!!

Nice Flattie!

[Noonan]

Originally Posted by simicrintz

That pic is from the way back machine; look at those 3 wheelers!!!

Nice Flattie!

Right????
Oh the tales I could tell about times spent on a Big Red
Who needs suspension when you're riding on balloons??

[CC018]

Originally Posted by Noonan

Right????
Oh the tales I could tell about times spent on a Big Red
Who needs suspension when you're riding on balloons??

By the early 90s the off road equipment had changed completely. This was my wife’s first 4 wheeler. Of course I still preferred my jeeps for the dunes. Once paddle tires hit the market it was much more fun to run in 2 wheel drive, high range and get the paddle tires kicking up huge rooster tails.