taming The Beast

[fishingpaul]

Hi i thought the Aurora was an off road bike not a commuting bike ? ..!

Yes but used off road even less than range rovers and freelanders,how many people have access to true off road anyway.

 

[weirdfish]

1. Get a decent ali set of cranks with a 55T large ring and you will then know just how this baby can cruise in top gear.(set to high power)

Well it didn't take long I've changed the cranks and fitted a 54T outer which gives a good usable range in both medium & high power settings. I've used a 38T as the inner that is only there as a get it home best you can non powered setting. I've actually removed the front dérailleur and I'll just stop and shift the chain by hand if it's ever needed.

I've changed the chain to suit the new gearing as is it was lunching the rear dérailleur if you selected the 34T on the rear. I've yet to use the 34T so I could have left it as was but I just know that I'll select it by mistake at the worst possible moment

 

[Old Timer]

Well it didn't take long I've changed the cranks and fitted a 54T outer which gives a good usable range in both medium & high power settings. I've used a 38T as the inner that is only there as a get it home best you can non powered setting. I've actually removed the front dérailleur and I'll just stop and shift the chain by hand if it's ever needed.

I've changed the chain to suit the new gearing as is it was lunching the rear dérailleur if you selected the 34T on the rear. I've yet to use the 34T so I could have left it as was but I just know that I'll select it by mistake at the worst possible moment

And your impressions are????

 

[weirdfish]

Very good so far. I've not done the commute yet but the short test rides today seemed a worthwhile improvement.

 

[weirdfish]

After a couple of days of commuting I can definately say it was a worthwhile upgrade.

Using medium power I'm generally only using gears 2 to 5 with the whole drivetrain feeling smoother and easier to use. In high power 7th is now much better once you're up to speed.

Removing the front derailleur and shifter gives it a sleeker look too. Mind you, how sleek it'll look when I'm shifting the chain by hand is up for debate

As I'm no longer using the stock lights and therefore removed the switch, I've moved the assist/thottle switch to the left side, which has tidied up the look of the right side. I might have a go at swapping the rear shifter to a rapidfire one as I find the stock awkward to use, but at first glance I think the throttle may make that difficult.

At least the frame and forks remain standard

 

[Old Timer]

After a couple of days of commuting I can definately say it was a worthwhile upgrade.

Using medium power I'm generally only using gears 2 to 5 with the whole drivetrain feeling smoother and easier to use. In high power 7th is now much better once you're up to speed.

Removing the front derailleur and shifter gives it a sleeker look too. Mind you, how sleek it'll look when I'm shifting the chain by hand is up for debate

As I'm no longer using the stock lights and therefore removed the switch, I've moved the assist/thottle switch to the left side, which has tidied up the look of the right side. I might have a go at swapping the rear shifter to a rapidfire one as I find the stock awkward to use, but at first glance I think the throttle may make that difficult.

At least the frame and forks remain standard

Hiya

Glad you like the upgrade, with that amount of power on tap it just makes sense to have a decent higher gear available. I use the large ring all the time and in medium power 4,5 and 6 are great gears, if I`m in a bit of a hurry then high power and 7th gear seas a very rapid progression without whisking my legs into mush

 

[jbond]

Controller

I've been digging. I've just posted this on ES asking for info about the controller so it's mostly for reference here and includes info you probably already knew.

It's a Bafang setup with a BPM marked 36V350W 26(11). It also has the E-Bus wiring concentrator and a Mode switch marked 980. The battery is a Phylion LiPo 36V10AHr.

Here's the case

Controller

Underside

Here's all the numbers
Rated Voltage 36V, Max Current 18A, Rated Current 9A, LVC 31.5V, Throttle 1.2V->4,4V, Product No. W???1004032169, CE: G2M20211-1592-16, LSDZS.com, PS6G96A, 212304A, 200504, 6 FETS IRF3205 927PZK, Big Cap 50V 1000muF, Chip 78MOS 980119, daughter board SLM-A 290508. There is a throttle-pedelec switch. The pedelec seems to be on-off rather than any kind of cadence or torque sensing. There looks to be a set of programming pads marked S (for serial?) in the furthest corner from the FETs and connector pads. This is different from the pics I've seen on ES of the programming pad locations.

So this is a 36v 350W, 6Fet, from LSDZS. The case is about 100mm on the biggest dimension, so I guess this is this one.
ÄϾ©ÊÐäàË®Ïصç×ÓÑо¿ËùÓÐÏÞ¹«Ë¾ www.lsdzs.com

Overall performance is approx 11mph, 16mph, 21mph in the three modes. These speeds seem to be controller limited rather than hitting the free running top speed of the motor. I have to say I'm happy with this, but curious about what, if anything, can be done to get more performance preferably without changing batteries. I suspect that the controller is programmed conservatively and even staying with 36v there's more power and top speed available. The next stage might be to swap out the controller for one from ecrazyman but that may mean losing the wiring concentrator and mode switch/battery health indicator. I don't know the C rating of the battery but I would have thought it could cope with short bursts of 2C.

So what do you think? Does anyone recognise this?

[edited to add] Just found this Endless-sphere.com • View topic - Bafang BPM Pics and Specs - Large 3.9Kg Sensorless Geared that has a spec sheet. The 11 code motor has a no-load speed of 285rpm at 36v Which I make 24mph. So the top speed we get is what we get. There may be some more power to be had if we unleash the current, but the bike is not exactly slow at accelerating or climbing hills. I'm beginning to think the only realistic upgrade is the jump to 48v and a new controller. So it's probably time to stop worrying at this and just ride the damn thing! I'll save the pipe dreams for the next bike!