2008 ESR MOTOR! (10% more efficient)

[mr. bits]

"The new 2008 motor is installed with stronger magnets, lower brush drag, better cooling, and ball bearings, not bushings all creating about 10% more efficiency." - Steve Patmont

this is the news I got in a PM from steve.

oh, and FINALLY my new ESR will be here soon!!! and with a NEW MOTOR! :-)

[michaelplogue]

Great news! I wonder it the new motor is interchangeable with the older one, so we can upgrade our older ESR's......

[ViNN`/]

"The new 2008 motor is installed with stronger magnets, lower brush drag, better cooling, and ball bearings, not bushings all creating about 10% more efficiency." - Steve Patmont

this is the news I got in a PM from steve.

oh, and FINALLY my new ESR will be here soon!!! and with a NEW MOTOR! :-)

Oh man now i bet your happy you waited. Now you get to be one of the first to try out this new motor. Let us know how you like it. Be safe, be easy.

Vince

[mr. bits]

Great news! I wonder it the new motor is interchangeable with the older one, so we can upgrade our older ESR's......

yep, sweet news! I am happy that I was able to wait it out! he didn't give me any other details beside the ones I quoted here.

I will make sure any tell everyone what I think of this new motor! be sure of that!

-currently grinning, from ear to ear!

[Wasp93]

Is it faster?

[mr. bits]

Is it faster?

Hoping that Steve, or Tim, will jump in, and give more details. We all would like to know more...

[Sheriff Jon]

Great news! I wonder it the new motor is interchangeable with the older one, so we can upgrade our older ESR's......


Being interchangable would be SWEEEEEEEET :banana:

My 1st Gen. motor is fine, but should I/any of us, ever need a new one, it sure would be swell if we could upgrade :D

[SOS99]

Cool I am about to order a ESR how long till DDM get these new motor versons?

[mr. bits]

Cool I am about to order a ESR how long till DDM get these new motor versons?

hard to tell, because my ESR has been on order for weeks, and I'm pretty sure, it's still not shipped. very very soon, I hope!!!! I am leaving town on the 10th, and I want to take my new ESR750EX with me, when I go....

[Gbcue]

hard to tell, because my ESR has been on order for weeks, and I'm pretty sure, it's still not shipped. very very soon, I hope!!!! I am leaving town on the 10th, and I want to take my new ESR750EX with me, when I go....
Where did you order yours from?

I'm glad I waited!

[mr. bits]

ordered mine through GETaPED, however, they are all shipping directly from PMW, is my current understanding.

[Wimmig]

A logical step in unit production. Better sooner than never.

[classicm]

Yes they are offering a retrofit, the new motor has a higher rpm so they are using a 13/80 gear combination and different length chain. Have some ordered to upgrade the old model and test soon.

[Goped Geek]

How come lately there are many noob that knows more "inside-scoop" than the OG? :D Evade? Staff?

[classicm]

I happen to be a dealer and the PMW newsletters highlighted the product changes. The new motors and auto chain tensioning system is already available to order as upgrades. I'll be putting these on my own personal ESR750EX to demo for comparison probably by next weekend.

[JRDELUNAIII]

I happen to be a dealer and the PMW newsletters highlighted the product changes. The new motors and auto chain tensioning system is already available to order as upgrades. I'll be putting these on my own personal ESR750EX to demo for comparison probably by next weekend.



Are you able to tell us:

1. The part number and cost of the new Electric motor ??
2. Is the new motor bolt on to the older ESR750 or do you need to purchase other parts ??
3. I saw that you had mentioned new 13/80 pinion and sprocket combo, will the new motor still run and work with the older 15/75 combo ??

The reason I ask is that since the new motor has a supposedly has a higher RPM, if it can use the older 15/75 combo, it would give it a higher top speed, which would be nice.

Thanks for any info. God Bless :)

[classicm]

The motor directly replaces the old one on the previous models. As far as the gearing I'll let you know about speed and performance once installed on my older model which should be by next weekend. I've just ordered some of the new parts last week and assuming they arrive by next weekend I will be installing and testing them so I can report back. I see no reason why one couldn't use the original gearing to get higher speeds if desired. My ESR750EX already has 13/80 gearing since I have the slightly larger AT tires on it and I used the lower gearing to compensate, but before changing the original gearing definitely provided more top-end speed when compared to stock, just a little slower off the line.

As far as price, it will vary by dealer of course, but should run about $175 or so and the new auto chain tensioner about $35.

[v tach]

The higher stock gearing on the older ESR's might be a bit too much for the new motor. That is a fairly significant difference in drive ratio. You could be increasing the motor load considerably which means a lot more heat for the motor and a much greater drain on the batteries. Hard to say without actually doing some current measurements under load.

The new motor sounds like it uses a little bit larger gauge windings with maybe a little less turns. That means a higher rpm motor but less torque, hence why they likely changed to the new drive ratio. Electric motors don't do well once you start pushing them beyond peak efficiency.

[classicm]

One correction to my earlier post, they are using a 13/82 sprocket ratio not 13/80 as I previously indicated.

[JRDELUNAIII]

Actually I saw this equation somewhere and it seems to be kind of accurate.

(RPM of motor / Gear ratio) x (tire size in inches) / 336 = MPH


Let us input some number for a STOCK ESR750 with the older motor:

1. I am estimating the RPM speed of the older stock ESR motor to be around 3400rpm +/- 250rpm
2. Stock gear ratio of 75/15 = 5
3. Wheel size 10 inches

3400 / 5 = 680
680 x 10 = 6800
6800 / 336 = 20.24 Mph

I am assuming that a nice lightweight 180 pound person gets about 20-21Mph on the stock ESR ?? I weigh approx. 225+ pounds and I just did verified GPS top speed of 19.8mph and about 18.5 Mph average.


Now assuming that the NEW ESR motor Go-Ped is using is making about the same speed as the older one like I have. Here are some numbers that I got:

1. I am estimating the new motor to be around 4300rpm +/- 250rpm
2. New gearing of 82/13 = 6.307
3. Wheel size 10 inches

4300 / 6.307 = 682
682 x 10 = 6820
6820 / 336 = 20.29 Mph

Now assuming that you can use the NEW ESR motor with the older 75/15 gearing:

4300 / 5 = 860
860 x 10 = 8600
8600 / 336 = 25.6 Mph

Again all of this is just an estimation and theory as there are many items that can affect the speed. Enjoy and God Bless :)

[PatmontS]

Excellent annalysis JRDELUNAIII, and very accurate as well.

Yes, the new motor with the old stock sprocket ratio will get close to your calculated top speed with a 180 lb person. Surprisingly however it will need almost twice as much current, and resulting drastic heat increase with range, reliability and hill climbing ability decreases as opposed to the new appropriately sized sprocket ratio.

[JRDELUNAIII]

Thanks Steve. By the way I thought I remember you mentioning that one should not have the ESR motor run for about 25 minutes straight using WOT or something like that to avoid over heating it. How long is a good rest period between runs ?? I know that there would be several other factors that affect this, but would 10-15 minutes be a good time to let it cool off ?? Thanks again for any info. God Bless :)

[PatmontS]

The variables involved are too "variable" to be too specific.
I.E at what weight, gear ratio, tire pressure, wind restance, ground surface conditions, hills or flat, how many hills, how much are you towing, what speeds etc?
The new more efficient motor with it's sprocket ratio signifficantly improves the limit the unit can handle in terms of "duty cycle".
The time then to recharge is more than sufficient to cool it back down.
By feeling the "E Head", you should be able to gauge how your motor is holding up under the duty cycle you are asking of it. If it ever gets too hot to touch (over 140 deg) then it's being over worked, and will greatly reduce the motor/battery/controler life expectancy. (It's way hotter than that at the armature).
Most normal use applications never got the older motor that hot even at continuous WOT.
I hope this helps explain your good question.

[v tach]

Surprisingly however it will need almost twice as much current, and resulting drastic heat increase with range, reliability and hill climbing ability decreases as opposed to the new appropriately sized sprocket ratio.
Not surprising at all. Electric motors work well within specific parameters. Sure you can push them beyond their design spec but there are always consequences because of inefficiency.

[Goped Geek]

Actually I saw this equation somewhere and it seems to be kind of accurate.

(RPM of motor / Gear ratio) x (tire size in inches) / 336 = MPH


Let us input some number for a STOCK ESR750 with the older motor:

1. I am estimating the RPM speed of the older stock ESR motor to be around 3400rpm +/- 250rpm
2. Stock gear ratio of 75/15 = 5
3. Wheel size 10 inches

3400 / 5 = 680
680 x 10 = 6800
6800 / 336 = 20.24 Mph

I am assuming that a nice lightweight 180 pound person gets about 20-21Mph on the stock ESR ?? I weigh approx. 225+ pounds and I just did verified GPS top speed of 19.8mph and about 18.5 Mph average.


Now assuming that the NEW ESR motor Go-Ped is using is making about the same speed as the older one like I have. Here are some numbers that I got:

1. I am estimating the new motor to be around 4300rpm +/- 250rpm
2. New gearing of 82/13 = 6.307
3. Wheel size 10 inches

4300 / 6.307 = 682
682 x 10 = 6820
6820 / 336 = 20.29 Mph

Now assuming that you can use the NEW ESR motor with the older 75/15 gearing:

4300 / 5 = 860
860 x 10 = 8600
8600 / 336 = 25.6 Mph

Again all of this is just an estimation and theory as there are many items that can affect the speed. Enjoy and God Bless :)

So on my gsr

11500/7.5=1533
1533X10=15330
15330/336=45.625

Reality my top speed with no wind and flat surface is 41 mph.

[v tach]

So on my gsr

11500/7.5=1533
1533X10=15330
15330/336=45.625

Reality my top speed with no wind and flat surface is 41 mph.


11,500 rpm with a 7.5:1 drive ratio takes one heck of an engine.

[sacksyboy]

Steve,

I want the 2008 750EX, when will they be available?

G

[PatmontS]

Steve,

I want the 2008 750EX, when will they be available?

G

Supply issues now behind us. Only a few days lead time from date of order.
Next week we'll post 1-3 days like all our other products.
Interestingly however, each time we increase production, demand increases even greater, so don't wait.

[Goped Geek]

The current price tag holding me down.