The instructions are to boot it up in full reverse, wait till light stops blinking then full forward wait ...then neutral.
I can't get to do anything other than blink red, which it does whether it's getting pwm signal or not.
I don't know what the pulse width is but have tried servo controller in every possible position . I even tried using hobbywing as a power supply so controller was already powered up before I turned on the XC

 

I presume somewhere around the middle of the dial of the servo tester would get you the 1.5ms + - 0.05 the esc expects for boot up. Go both ways to the limits then figure out the center, start from there. Or get an Arduino to do generate just that, at least to confirm the esc isn't bad.

 

Tried that and about 40 spots all around the dial .... NADA.
Sending it back. Will be interesting to see how good the Aliexpress process is for that. This will be my first time after well over 100 transactions.

 

So I finally got a refund for faulty ESC and then bought another one.
Spent last few days testing various pulleys, and now realise it's not going to make that much of a difference. It seems the real thing holding me back is the battery probably closely followed by the motor. So just trying to make the best of what I now have. This dyno was in 3rd gear and is the highest I've gotten so far albeit not much above VD on previous page which was done in 2nd with the hobbywing ESC. Couldn't do a run in 3rd on the Hobbywing without it tripping out on amps so yeah ...it's better.

So close to my target 300!!!!

 

Spent a lot of time pondering on this over the last few days. Upshot from that is that I'm going to be upgrading most of the wiring, the bms and the battery bus bars.
Idea is to use less battery power heating up wires etc and more on actually driving the eSC.
This thing WILL make 300whp + !!!!!


Busbars I used were those supplied with the battery cells ..... they are 13mm2 cross section suitable for 40A continuous and I've been putting 400A plus through them!

 

I love your resolve. I'm gearing up to build one of these too and your pursuit of 300 horsepower is inspiring.

I've been trying to follow the build, how many batteries cells do you have in series right now?

 

Thanks. Battery cell no is determined by what voltage you intend to charge to and cel voltage. For 2.3 nominal LTOs you'd want 19-20 for 50.4v fully charged voltage. I'd go for 20 and charge to 52V if your charger will do that.

 

Think it's time for another real dyno as it looks to be at 300.
Check out peak torque now @ 230 lb/ft !


New 340A BMS , bigger bus bars , 28T pulley

 

Good job Brett! It's good to see that reducing resistance can increase the amount of power out of that blower. How many watts were you pulling on it?

 

I have been reading and following this thread for sometime now and want to do it for one of my 8s. Thanks Brett, for all the effort and hair loss you put into it.

 

Cheers
That pull was 411A @ 45.3v = 18613w

 

Thanks, this has definitely been a challenging project for me.

 

Updated component list to latest. Post#2