GNG, 1000W 48V BB-drive, $400

I did a kv test on the 404 big block motor today. I bought an inexpensive optical tach and hooked the motor up to two 6S LiPo NanoTechs and a multi-meter. The batteries were putting out 45v wired 12S. The big block consistently turned 2810 rpm at full throttle. By my calculator- 62.44 rpm/volt.

Video: http://youtu.be/5CGo4GtxtjY

EDIT: Using the same test equipment my original Gen 1.0 GNG motor turned 2977 rpm @ 45v. 66.15 rpm/volt. About 6% higher.
 
LightningRods said:
I did a kv test on the 404 big block motor today. I bought an inexpensive optical tach and hooked the motor up to two 6S LiPo NanoTechs and a multi-meter. The batteries were putting out 45v wired 12S. The big block consistently turned 2810 rpm at full throttle. By my calculator- 62.44 rpm/volt.

Video: http://youtu.be/5CGo4GtxtjY
Click to expand...

LR,
can you run the same test on the small block motors you have?
It'd be interesting to know how close are they to the claimed 67 kv and how much variance there is between them.

Avner.
 
LightningRods said:
I did a kv test on the 404 big block motor today. I bought an inexpensive optical tach and hooked the motor up to two 6S LiPo NanoTechs and a multi-meter. The batteries were putting out 45v wired 12S. The big block consistently turned 2810 rpm at full throttle. By my calculator- 62.44 rpm/volt.

Video: http://youtu.be/5CGo4GtxtjY
Click to expand...

Perfekt!
 
ferret said:
can you run the same test on the small block motors you have?
It'd be interesting to know how close are they to the claimed 67 kv and how much variance there is between them.
Click to expand...

Yes, I'm meaning to do that. I just have to put one of them back together first!
 
Yes we should be able to run a lot of amps at low volts. It will make for a super torque monster that will be easier to do reductions on.

And of course at 50 amps @ 72v...... :twisted:

EDIT: Using the same test equipment my original Gen 1.0 GNG motor turned 2977 rpm @ 45v. 66.15 rpm/volt. About 6% higher.
 
LR,
I would like to try the sheets but on your site you have 4 types. I have an un modified GNG mid drive, 68 mm BB. How do I order?
Thanks
 

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I thought Mike discontinued the V1 sheets. I've been waiting for his jackshaft housing and new sheets with tensioners, so I can go with the wider belt conversion.
 
skyungjae said:
I thought Mike discontinued the V1 sheets. I've been waiting for his jackshaft housing and new sheets with tensioners, so I can go with the wider belt conversion.
Click to expand...

I have a limited number left of my original design adjustable sheets for Gen 1.0 with the open jackshaft. For people who are happy with the open jackshaft but want to lose the fake adjuster that comes with the GNG kit this is your last chance. Like Skyungjae says I am discontinuing production of the 1.0 sheets.

What will be available for anyone with one of these 'Honglida' motors that GNG uses is my own design jackshaft and housing. So if you have a Gen 1.0 you can upgrade the jackshaft. I will be using these on my scratch built mid drive kit which will be available in the next month. I am already preselling them. The first two production kits go to electricbike.com for testing.

You can reach me with questions or orders by clicking the PM button at right.

Thanks,
Mike
 
When do you reckon those new wider pulleys are going to be available? :D
 
The pulleys are available now. In order to install them you need one of the following:

(1) The original GNG steel adapter that threads into the 80 tooth pulley and a Chinese freewheel with 35mm-1.0mm threads. These usually have four bolt holes in them. You can also use a 16 tooth freewheel sprocket with 35mm-1.0mm threads. Or, as a last resort, you can cut the center out of the original 80 tooth GNG pulley and use it as an adapter with a bit of work. Depends on how handy you are.

(2) The sprocket adapter from the 60v chain drive GNG. It bolts right up to my 90 tooth pulley. I'm developing an 18 tooth driver that will bolt up to the 10mm double flat spindle on the 60v motor.

(3) One of the 6061 alloy 1.37-24tpi adapters I'm having made. I just ordered 100 of them. It was the last piece I needed to complete my stand alone, GNG free kit. Dicta, ACS and White Industries freewheels will bolt right up.
 
LightningRods said:
(2) The sprocket adapter from the 60v chain drive GNG. It bolts right up to my 90 tooth pulley. I'm developing an 18 tooth driver that will bolt up to the 10mm double flat spindle on the 60v motor.
Click to expand...

I'm curious how many people who're starting off with the belt drive will end up converting to the wider belt.

Anyhow, how's the steel jackshafts coming along? Hopefully the cost is way less than billet aluminum.
 
skyungjae said:
I'm curious how many people who're starting off with the belt drive will end up converting to the wider belt.
Click to expand...

So am I.

Anyhow, how's the steel jackshafts coming along? Hopefully the cost is way less than billet aluminum.
Click to expand...

18' of 1 3/8" steel tube ordered. It should be here next Thursday. It's bound to be a lot less work than the billet aluminum job. It takes forever to make a billet piece if you don't have a CNC mill.

3 big block motors and 10 small block motors ordered and on the way. If I sell out the first run of 10 complete kits (they're about half gone already) I'll order more motors.
 
It's a good thing I picked up those spare belts from hillyterrain. On my way to the train station this morning, I tried to throttle, but nothing happened. I thought it was a short from the rain initially, but then I looked down to see... well, nothing. :lol: Did a quick spare belt install on the train on the way to Los Angeles and all is well.

I gotta say though... you can't cheap out on belts. My original Gates belt that came with the kit lasted me 700+ miles while this eBay bought $10 speed control belt lasted about 150+ miles.

Hopefully, the sealed jackshaft and for 1.0 users is available before I go through the next 6 belts on my desk. :)
 
hi , skyungjae did you install LR's 18t driver on your bike it was very easy to install .I just tapped a 1/4-20 bolt & washer this way i can replace it if I f-it up . so far this driver looks like a winner!!!!! to me. I also run it with a 95t pulley . ps love your bike very sweet! 8)
 
gknowes said:
hi , skyungjae did you install LR's 18t driver on your bike it was very easy to install .I just tapped a 1/4-20 bolt & washer this way i can replace it if I f-it up . so far this driver looks like a winner!!!!! to me. I also run it with a 95t pulley . ps love your bike very sweet! 8)
Click to expand...

I have not ran any of his products yet. I'm waiting for all the parts I want to be available before moving forward. I do intend on running his wider pulleys, but I'd like to upgrade to a sealed jackshaft and adjustable sheets w/ tensioners. While I'm waiting, I'll kill a few more belts. :lol:
 
skyungjae said:
gknowes said:
hi , skyungjae did you install LR's 18t driver on your bike it was very easy to install .I just tapped a 1/4-20 bolt & washer this way i can replace it if I f-it up . so far this driver looks like a winner!!!!! to me. I also run it with a 95t pulley . ps love your bike very sweet! 8)
Click to expand...

I have not ran any of his products yet. I'm waiting for all the parts I want to be available before moving forward. I do intend on running his wider pulleys, but I'd like to upgrade to a sealed jackshaft and adjustable sheets w/ tensioners. While I'm waiting, I'll kill a few more belts. :lol:
Click to expand...

I just picked up 20 feet of 1 3/8" steel pipe this afternoon that I special ordered for the jackshaft tubes. We'll start machining those this week.

The 1.37"-24 to 12mm freewheel adapters have been ordered from a CNC machine shop. I should have those in two to three weeks. Then the primary upgrade will be complete.

One setback today. I just saw that Mister Tao had "refunded" my order for 10 GNG spec motors. I PMed them asking for an explanation but have not heard back. There are great deals to be had in China but the waters are treacherous and deep. My order for three 404 big blocks is still processing.

Gknowles, what type of belt are you running with the 18 tooth GT driver and 95 tooth HTD driven pulley? A 15mm wide HTD? If that combo works okay for you I am very excited about the prospects for the wide GT pulleys. You are not supposed to run HTD belts on them!
 
hi lightningrods yes i'm running htd belt works good but i will be getting the wright belt soon just letting everyone know what a great product the 18t driver is :D
 
gknowes said:
hi lightningrods yes i'm running htd belt works good but i will be getting the wright belt soon just letting everyone know what a great product the 18t driver is :D
Click to expand...

That's amazing, Gary. It just shows how bad the stock GNG driver pulley is. Gates lists the GT pulleys as "incompatible" with HTD belt. You should see at least a 400% improvement in grip when you switch from 15mm HTD to 25mm GT. 400% is assuming you're using a HTD pulley!
 
Has anyone found a source for the fanphy freewheels, or maybe a stronger alternative? Seems like GNG found a cheaper version to put on their newest kits.

This one looks similar: http://www.aliexpress.com/item/PARIS-STYLE-High-quality-round-great-wall-12-12t-single-12-m18-inside-diameter-bicycle-accessories/1157753537.html

I'm thinking I should just go with the 13t ACS freewheel upgrade, this is the proper adapter, right?

http://www.staton-inc.com/store/products/11_mm_ID_with_4_mm_key_way_Adapter_for_freewheel_sprocket_13_14_15_tooth_30_mm_x_1_0_OD-1860-73.html
 
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