Search found 38 matches

by ttobiassen
Jul 08 2019 10:15am
Forum: Items for Sale - Used
Topic: Ebike etc garage sale: motors, controllers, mechanical bits
Replies: 4
Views: 779

Ebike etc garage sale: motors, controllers, mechanical bits

***please research your shipping options a bit before reaching out with an offer, please :) *** Hi all. Tried to make my description thorough, but basically: I'm clearing out the last 5 years of EV hobby, including ebike parts, go kart parts, batteries, controllers, the works. Local viewing at shop ...
by ttobiassen
Jul 03 2019 8:28am
Forum: Items for Sale - Used
Topic: *SOLD* 4S 16000mAH Turnigy Multi-star packs, QTY8 available
Replies: 0
Views: 219

*SOLD* 4S 16000mAH Turnigy Multi-star packs, QTY8 available

*SOLD* Hi guys, TL;DR: 8 packs, some brand new, others with less than 10 cycles, well cared for. $50/each or $300 for all. Shipping on the buyer. I bought these packs in summer of 2017 for my Power Racing Series go-kart project (about 4000watt peak draw, continuous around 1500watt), and after two ra...
by ttobiassen
Jul 03 2019 8:17am
Forum: Items for Sale - Used
Topic: FAT front/rear wheelbuild: Nexus8, Surly Fork, Weinmann DHL65
Replies: 0
Views: 202

FAT front/rear wheelbuild: Nexus8, Surly Fork, Weinmann DHL65

Hi all, Pictures, but please read the post carefully: https://photos.app.goo.gl/c7LRMKAbjxEyt7DA7 TL;DR: Any or all of yuba rolling chassis with certain accessories, fat IGH rear wheel build, weird front fat wheelbuild. YUBA Project bike, formerly with triangle battery and BBS02, is now an unfinishe...
by ttobiassen
Jun 20 2019 8:33am
Forum: Items for Sale - Used
Topic: [SOLD] (Price Reduction) Customised Axial Flux GM HPM5000b & 2-stage Reduction drive
Replies: 13
Views: 1401

Re: [AUS] (Price Reduction) Customised Axial Flux GM HPM5000b & 2-stage Reduction drive

I own a Yuba Mundo and am interested. My frame is a V4. What mounting provisions had you resolved for placing this in that rear dead zone on the Yuba? How much would shipping be to zip code 15224?
by ttobiassen
Jul 24 2017 9:01am
Forum: Battery Technology
Topic: Charge as 14S, Run as 13S
Replies: 5
Views: 513

Re: Charge as 14S, Run as 13S

@ZackClark70 The rest of my system will indeed survive 14S, this is a competitor in the Power Racing Series and they don't like to see nominal voltages above 48V (13S is 48.1) because of some of their safety rules. If the pack wasn't WIRED as 14S while on the race track, then the 14th cell and BMS w...
by ttobiassen
Jul 24 2017 7:46am
Forum: Battery Technology
Topic: Charge as 14S, Run as 13S
Replies: 5
Views: 513

Charge as 14S, Run as 13S

So, I have the following strange problem... I have 7 Leaf battery modules, ie, 14S, that I have wired and working properly with a 14S BMS (discharging at 0.5C continuous, 1.5C peak and charging at 0.1C). This was for project A, now I was hoping to use it for project B. For project B, I want to use 1...
by ttobiassen
Jul 11 2017 8:19am
Forum: Items Wanted
Topic: Looking for a Fat 80mm rim and/or 100mm rim with 36h
Replies: 3
Views: 344

Re: Looking for a Fat 80mm rim and/or 100mm rim with 36h

I have a matte black anodized one I could probably let go of. It's NOT a rim brake compatible one, though.
by ttobiassen
Feb 27 2017 8:10am
Forum: Items for Sale - Used
Topic: everything sold
Replies: 9
Views: 1324

Re: 18fet lyen - H3540 motor - CA gen 1 - And others

Would you consider selling the 18FET Lyen by itself? I was initially interested in the motor and wheelbuild (would go well on my Yuba Mundo frame), but it looks like you were pushing it pretty hard with your original build (22S, 5kw peak, 50mph, geared tall, Texas heat) so I'd be concerned about ado...
by ttobiassen
Feb 25 2017 3:36pm
Forum: Items for Sale - Used
Topic: 48v 20ah battery Pittsburgh (sold)
Replies: 5
Views: 510

Re: 48v 20ah battery Pittsburgh

Local YINZER says dibs! Hit me up by PM to arrange payment and pickup. I live near Lawrenceville.
by ttobiassen
May 03 2016 4:36pm
Forum: Items for Sale - New
Topic: BBSHD & BBS02 Build Competition for Dillenger Switcheroonie!
Replies: 46
Views: 9429

Re: BBSHD & BBS02 Build Competition for Dillenger Switcheroo

What goes almost 30mph, has a 400lb cargo capacity, and a sweet *stance*? A BBS02 Yuba Mundo (v4) build with 3.5" Fat tires, a 13S Samsung 25R pack, and an 8-speed IGH! This project has been all over the place since inception, but my goal with having a bottom bracket drive was to have the gearing to...
by ttobiassen
Sep 29 2015 7:23am
Forum: E-Bike Technical
Topic: Mysterious degradation in performance - Lyen/Transmag
Replies: 19
Views: 2147

Re: Mysterious degradation in performance - Lyen/Transmag

Our go kart did great! We had some SERIOUS sprocket wear and tire wear problems, but none of those is a big surprise for us. The TRANSMAG performed great, as did the Lyen controller, at battery peak currents of about 60A and a continuous draw of 40 A for the whole weekend. I also checked the kV of t...
by ttobiassen
Sep 26 2015 6:38am
Forum: E-Bike Technical
Topic: Mysterious degradation in performance - Lyen/Transmag
Replies: 19
Views: 2147

Re: Mysterious degradation in performance - Lyen/Transmag

Well, the go kart is back to being fast! I just had to set all the "wait, aren't we supposed to leave that alone?" controller parameters to "t-minus 5 minutes to meltdown" for it to work. Not sure what's going on.... The "Speed at full throttle" setting, which historically I've been warned not to us...
by ttobiassen
Sep 22 2015 7:18am
Forum: E-Bike Technical
Topic: Mysterious degradation in performance - Lyen/Transmag
Replies: 19
Views: 2147

Re: Mysterious degradation in performance - Lyen/Transmag

Two quick notes: 1) To test the *potential though unlikely* idea that the 3spd is introducing mechanical drag UNDER LOAD but not at no load, we do have a drop in replacement jackshaft (simple, just a bicycle axle with the correct sprockets on it) that would prove whether or not the IGH is to blame. ...
by ttobiassen
Sep 22 2015 7:14am
Forum: E-Bike Technical
Topic: Mysterious degradation in performance - Lyen/Transmag
Replies: 19
Views: 2147

Re: Mysterious degradation in performance - Lyen/Transmag

Looks like Roller is going to help me out with the magnet issue, so that's cool. Meanwhile, though... The replacement motor is in, the kV check results in 70-74 rpm/volt like it should, but... We're still slow. With the old, nearly identical motor, when it was new it was REALLY impressive. It would ...
by ttobiassen
Sep 19 2015 5:37pm
Forum: E-Bike Technical
Topic: Mysterious degradation in performance - Lyen/Transmag
Replies: 19
Views: 2147

Re: Mysterious degradation in performance - Lyen/Transmag

General follow-up: I just hooked up the spare 532 I had, and it fires up with a kV of 72rpm/volt, just as expected. So, given my competition is less than a week away, that's the good news. The WEIRD news is that the magnets I received in the mail are just barely the wrong size. The old magnets are 4...
by ttobiassen
Sep 01 2015 9:56am
Forum: E-Bike Technical
Topic: Mysterious degradation in performance - Lyen/Transmag
Replies: 19
Views: 2147

Re: Mysterious degradation in performance - Lyen/Transmag

Bonus round 1: found this great reference for BH/Demagnetization curves. Very believable that demagnetization is our problem. https://www.kjmagnetics.com/blog.asp?p=temperature-and-neodymium-magnets Bonus round 2: Our Facebook page has lots of pictures of our silly little go kart, in both Batmobile ...
by ttobiassen
Sep 01 2015 8:41am
Forum: E-Bike Technical
Topic: Mysterious degradation in performance - Lyen/Transmag
Replies: 19
Views: 2147

Re: Mysterious degradation in performance - Lyen/Transmag

Hey guys. I'll try to fill in the rest of the details for you. The vehicle in question is an entrant into the Power Racing Series, or PRS, in which you take the body of a children's electric ride on toy like a PowerWheels and use it as a template to build an electric go kart. You must stick to the s...
by ttobiassen
Aug 31 2015 7:56pm
Forum: E-Bike Technical
Topic: Mysterious degradation in performance - Lyen/Transmag
Replies: 19
Views: 2147

Re: Mysterious degradation in performance - Lyen/Transmag

The peak amps mentioned in my post are displayed via a WattsUp, so even if they're off a little bit because of RSHUNT values, they're self-consistent and have been pretty close in quantity to what the XPD programming says it should be, at least until BEFORE the change occurred. NOW we see only 35-40...
by ttobiassen
Aug 31 2015 7:41am
Forum: E-Bike Technical
Topic: Mysterious degradation in performance - Lyen/Transmag
Replies: 19
Views: 2147

Mysterious degradation in performance - Lyen/Transmag

More details below, but basically: Lots of hard driving for about 60 minutes of a 75 minute endurance race with pretty consistent performance and current peaks of about 55-60 amps, despite very hot controller and motor temps. IR gun registered 150-170F sustained temperature for motor and controller....
by ttobiassen
Apr 13 2015 6:39am
Forum: E-Bike Non-hub Motor Drives
Topic: Yuba Mundo FAT with BBS02 mid-drive
Replies: 22
Views: 5291

Re: Yuba Mundo FAT with BBS02 mid-drive

5404 with 88.8V 20AH should be good for... 3000-4000 watts, depending on your controller. Sounds like a great time. I'm pretty done with hubmotors for the time being because of a) practicality: I hate broken spokes and b) I like gearing. And I'm hesitant to go to a hubmotor that would be beefy enoug...
by ttobiassen
Apr 10 2015 1:28pm
Forum: E-Bike Non-hub Motor Drives
Topic: Yuba Mundo FAT with BBS02 mid-drive
Replies: 22
Views: 5291

Re: Yuba Mundo FAT with BBS02 mid-drive

I've been driving the YUBA around for a couple months now. Certainly looks pretty sweet: 20150325_175857.jpg 20150325_175903.jpg BUT! It is not without problems, some specific to the frame, Nexus IGH, and some with the BAFANG BBS02 Problem A: Yuba Dropouts in concert with unconventional Nexus shaft....
by ttobiassen
Oct 06 2014 8:34am
Forum: E-Bike Non-hub Motor Drives
Topic: Yuba Mundo FAT with BBS02 mid-drive
Replies: 22
Views: 5291

Re: Yuba Mundo FAT with BBS02 mid-drive

Looks deceivingly close to completion...
by ttobiassen
Oct 05 2014 6:53pm
Forum: E-Bike Non-hub Motor Drives
Topic: Yuba Mundo FAT with BBS02 mid-drive
Replies: 22
Views: 5291

Re: Yuba Mundo FAT with BBS02 mid-drive

The Yuba is coming together! I got the Sunlite Crusher (wire bead) tires mounted (with difficulty) on the DHL65 wheelbuild and they look sweet. They do NOT fit in the stock Yuba fork, which I am replacing with a Surly Pugsley (100 mm over-lockout version from 2012, since my hubs are 100 mm instead o...
by ttobiassen
Sep 23 2014 6:28pm
Forum: E-Bike Non-hub Motor Drives
Topic: Internally geared hubs as mid-drive transmissions?
Replies: 8
Views: 2329

Re: Internally geared hubs as mid-drive transmissions?

Update on Nexus 3spd in power racing series electric go kart: Our max input speed to the Nexus with our previous motor (Ampflow A28-400, brushed, about 2kw peak) was about 1400 rpm, which was a 3.3:1 reduction from the motor output. The spoke flange was adapted to a sprocket driving the differential...
by ttobiassen
Sep 17 2014 7:00am
Forum: E-Bike Technical
Topic: Issue with Lyen and USB-TTL programming cable
Replies: 3
Views: 388

Re: Issue with Lyen and USB-TTL programming cable

Update: resolved* *The cable was indeed toast. I remembered that user Lenk42602 was local to me, and I was fortunate that he had another cable sitting around. However, after confirming that my cable and software was working by test programming another controller, I then tried to revive the questiona...