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Re: CANbus 0-60 time

Posted: Fri Aug 19, 2011 2:39 pm
by GregH
I seem to recall both volts and amps being divide by 2.. Ie 0.5V and 0.5A resolution. I'm now buffering the amps and showing the average of the 25 samples every 1/4 sec which gives me the illusion of something closer to 0.1A resolution (putting my trust in the dither).

I've also noted the 85+ kw power on full speed acceleration.. Pretty cool as we'd been told the motor was only 80kw.

I don't really have data logging on my display so I'm graphing the current at the bottom of the 128 pixel screen with the option of a sample every 2.5, 10, or 60 seconds (ie, the last 5min, 20min or 2hrs).. I hope to use this to catch charger "sips" during balancing at end of charge.. This morning again tried to go to 100% and only reached 274 RAhC/SOC#... forced it tom charge again and got to 276, but no sign of sips after. I hate not having regen driving at 90+% SOC.. Just feels wrong.

Re: CANbus 0-60 time

Posted: Sat Aug 20, 2011 1:16 am
by garygid
It would help to know exactly what bits you use, and your scaling.

Volts need to be (roughly) between 300 and 400 for the pack.

The 16-amp L2 charging DC Pack amps should be about 8 or 9 amps (when near full, before tapering off), I suspect.

Re: CANbus 0-60 time

Posted: Sat Aug 20, 2011 9:19 pm
by GroundLoop
Sparky, I have a a Race Tech DL1 you can borrow if you want to compare these numbers to accelerometer/GPS readings. I think it has enough resolution you could confirm some of these scaling values.

Re: CANbus 0-60 time

Posted: Fri Feb 17, 2012 12:09 pm
by Brightonuk
So it is confirmed 0-60 9 seconds?

Does anyone know the 0-94 time (I was going to try it this morning, got to 83mph in the hammer lane on I75 and I passed a State Trooper in the slow lane) so I hit eco mode fast.............no ticket :D

Re: CANbus 0-60 time

Posted: Fri Feb 17, 2012 1:00 pm
by Reddy
Herm wrote:With a long and steady braking run you could work out the kwh/m number for the regen events.. then we would know efficient regen is in recovering energy.

We know regen is not 100% efficient but it would be nice to pin down the real number.
My thoughts as well. I would suggest running up to 60 mph then slowing down under three conditions:
1) In D only allowing the car to slow down to less than 10 mph, maybe even 5 mph before braking.
2) In ECO to the same stop or speed.
3) In ECO, but braking steadily at about twice the force of ECO regen down to the same stop or speed.

Then let's integrate those graphs.

Reddy.

Re: CANbus 0-60 time

Posted: Fri Feb 17, 2012 1:06 pm
by TomT
Around 9.7 is what most of the instrumented tests have shown...
Brightonuk wrote:So it is confirmed 0-60 9 seconds?

Re: CANbus 0-60 time

Posted: Fri Feb 17, 2012 1:25 pm
by Brightonuk
Wow it seems so much faster

I hope to pull a few Leaf drivers to a car meet tonight and as some of the cars are gonna be small imports with big exhausts you know the type I think this question may be asked.

In addition, can anyone tell me how far can you go? :lol:

Re: CANbus 0-60 time

Posted: Fri Feb 17, 2012 1:43 pm
by LTLFTcomposite
That 0-60 curve is more like a straight line than a curve. How does that compare to gas cars?

Just for laughs I went up against a friend's 550i at a light. For the first 50-100 feet I was ahead of him, then he left me in the dust. Totally non-scientific of course, as it could have just been reaction time hitting the gas.

Re: CANbus 0-60 time

Posted: Fri Feb 17, 2012 1:53 pm
by TomT
The inverter is not 100% efficient so it is going to have to pull more than 80Kw from the pack to send 80Kw to the motor... The car measures the power flowing in to the inverter, not going to the motor. Thus, that is exactly what I would expect to see.
GregH wrote:I've also noted the 85+ kw power on full speed acceleration.. Pretty cool as we'd been told the motor was only 80kw.

Re: CANbus 0-60 time

Posted: Fri Feb 17, 2012 2:55 pm
by Nubo
My LEAF often chirps the tires a bit under full accel from a stop. Those graphs look like it feels. Sudden movement, a very brief lull, wheels chirp, and then the railgun effect :)