ElectricMotorcycleForum.com

Sounds like you're both having fairly good luck with your packs.  Well, the 92% bit would make me a bit crazy, but if she can still get 80 miles in and have 35% left, that's better than I've ever gotten! (Though maybe that's due to rider weight, riding style, etc.)

Bonkers, sounds like yours is a poster child! I imagine that's the kind of behavior Zero designed for.  I assume the variations from that can be chalked up to deficiencies in the cell quality control process. Probably the science of testing/manufacturing the cells isn't quite as mature as we (and Zero) would like to believe.

I'd like to someday learn that there's a process for identifying and replacing bad cells in otherwise good packs so that a case such as mine (and possibly Richard's) doesn't turn into a $6000 repair.

Thanks for keeping me honest, Jaime.  I checked on the way home today, and you're right; mine, too, limits at 70 in ECO mode. 

I've updated the post above for the benefit of anyone who doesn't read beyond that point.

Sorry for the late reply on this old thread, but I have some recent experiences here that may be relevant.

The language of the OP says that on two occasions  the the bike refused to go above 75mph.  This is a suspicious figure to me, because I know that ECO mode imposes a limit at 75mph [edited: JaimeC, below, is correct - ECO mode imposes a 70mph limit, not 75 - I mis-remembered as I'm rarely in that mode - Jason], and you can define your own in custom mode.  When you hit this limit, it's like a hard stop.  It just doesn't go faster.  What you do to the throttle really doesn't matter (except if you decrease it enough to allow it to slow down), and the throttle response feels normal right up until you hit that magic figure, 75mph.  If the OPs choice of words were precise, I'd suspect something goofy happened with the mode the bike was in, or the mode it thought it was in.

Recently, my onboard charger failed (Dec '16).  It took about a month to get it to the dealer (thanks to Christmas vacation schedules and such), and during that time my bike sat at ~60% SOC (that was how high it got the night the charger failed.).

When I rode it to the dealer it had decreased to about 56%.  It was chilly that day - 40's I think, but bear in mind I ride year-round, 50miles round trip, sometimes in even colder weather (but usually hotter!)  I experienced something that has never happened to me on the bike before. The power of the bike kept dropping.  At the start of the leisurely 30-35 mile ride, I had to do about three or four miles in interstate.  My top speed was fine - maybe I was having a hard time at around 75 or 80, but I really wasn't trying to go faster. (I wanted to take it easy, because it was chilly, and was longish ride to start out a 56%).  The rest of the ride was back roads as I wiggled over to Conroe, TX, which I anticipated doing at mostly 50-60mph.  Over the course of the trip, though, my top speed got lower and lower, finally limping along with a max speed of ~35mph, with an associated loss of power/acceleration (i.e., I wasn't hitting a limit at 35, it was just running out of oomph.)  I think my SOC on arrival was around 20-25%, but I don't have that written down. 

Since the charger incident, I've been back in the dealer a few times for follow ups on this, and it still hasn't been resolved, though sometimes it's not so pronounced. 

Before this incident, I've had the bike down into the teens, (and even single digits once or twice!) while exploring the limits of the bike, and not seen this kind of behavior.  Conversely, last Friday (Apr 14) I got home from my commute with 15%SOC (dramatically lower than normal for my 50mile round trip, which used to land me home at ~35% pretty consistently), and the bike was topping out at 25mph.  That was scary.  I was having a 'Fred Flintstone' moment, where I had a strong urge to help paddle with my feet!  (The least exciting drag race ever: I pulled away from a stop sign, went full throttle, and by the time I got to my street, about 1/8 to 1/4 mile away, I was bumping along at 25mph.  Still full throttle.)

Anyway, when this type of powerloss/speed limit is imposed, it feels quite different from the 'governor' type limit.  When you crank on the throttle, it just feels like the bike's power output sags.  Almost like at a certain point (which moves as it gets progressively worse), increasing the throttle further causes a slight reduction in power, and then further movement has no effect whatsoever.

I'm still collecting logs and data as I discuss this with Zero.  They're telling me this is normal, and I'm saying "BS!"  I think I have a new battery pack in my near future, or at least a cell replacement or two, because at this rate (I'm currently at 197-- miles, just over two years old), there's no way it's gonna make it to five years/300,000 miles. 

Incidentally, at this moment, the bike is sitting at 63%, and my cell balance (per app) is wiggling from 10-12mv.  I'll check again when I get home.

Awesome!  I hope it continues behaving. 

Since I got the new power tank installed (about six weeks now?) mine has been rock-solid, touch wood.

It's so nice to have all the perks of an electric bike, and some reliability, too :-D

Jason

So far, after riding my 2014 S over 6K miles, I have yet to see a motor temperature more than 175 degrees, even while riding at freeway speeds in 85 degree temperatures.  For me, overheating has not been a problem.   

Ok, this is interesting... on my 2015 SR, I've put a bit over 6K miles, and I routinely see temperatures over 175F.  Like, daily.  It's rare that I get home in the afternoon without going over 200F.  It's not at all uncommon that I hit 212F (when the temp light starts blinking).  I sometimes (when doing something 'dramatic') get up around 250.

Many miles of highway speeds (~19-20 miles at 65-80mph, HOV lane - so I'm just going with the flow, usually.)  The temp does creep up gradually, over the ride.  SO... If you had a shorter trip, I wouldn't be so surprised at our differing experience.

I think my temp gauge may be reading a bit high, though.  Seems I've read about others noticing this, too.  When I first turn on my bike in the morning, the indicated temp is ~100 degrees.  Temp in the garage is probably closer to 75.

Actually, I say that - I'm not sure if that temp (on my dash) is the motor temp, the battery temp, the controller temp, or the charger temp.  I'm assuming it's the motor.

Interesting - I didn't know the FX's motor/controller had that kind of power.  Aren't they the same as the S from the same model year? 

On my SR, all it takes is a few seconds of keeping the throttle pinned (that few seconds can be spread out over a few instances in a given 30-60 period) and the motor temp light is blinking at me.  Possibly even enough to induce 'reduced performance' (over 250?).  This generally happens near the end of the afternoon half of my commute (if I have occasion to ride like that.)  So, it was already in the neighborhood of 200 degrees.  Actually, that gives me a thought... New thread time!

Was your FX cooked at the end of that 120MPH run?  I would imagine it would take... Gosh, at least 15 seconds of full throttle to hit that speed on that bike.  I'd think if it was already warmed up, you'd be taking it easy for a while after that. 

Two weeks of riding since getting the new power tank (not every day, but most), and "So far, so good!"

Knock on wood!