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'Lots of battery pack questions. Here's a challenge, sorta. Our pack is around 1.81Kwh, 72v Nominal, and we're running around 125 amps right now. Can you calculate (SWAG, scientific wild ass guess) what cell configuration we're using?

Metallica88 had the same problem and I was able to help him fix his bike simply by texting. He's probably more knowledgeable than I am right now. You might want to try contacting him and asking what he did and how he did it. Kinda a pay it forward thing.

The MSC garage is starting to look like a mini bike chop shop as we prepare more test bikes.

5 more HP is one of our goals. Possibly with the current controller but easily with something like a Sevcon. Mass reduction? Not happening.

Having owned several Altas and built a couple Alta based conversions (see Honda ElectroGrom and ElectroCRGshifterKart) I decided to build something electric that was NOT based on the Alta platform/running gear. Along with my partner in crime (Instagram Electrtrobraap (@electro_and_co) we...

The stock bikes were/are so softly sprung they were/are almost glued to the track. At the demo days everyone would rave about how well the bike worked (on a turn track). I don’t think I ever heard any rider say anything but “wow”. Then they asked about the price, lol.

I’ve also tried all kinds of unique shim stacks trying to replicate a desired curve but the theory (restackor) is way more precise than the application in most cases. A few tenths (.0001) on a preload shim can make a difference and certainly a few thou can totally throw off a setting.

Also, although the ultimate damping magnitudes will mathematically sum the actual “feel” of basevalve damping vs midvalve damping is quite different. There is a tremendous amount of hysteresis in basevalve damaging while midvalve damping is just the opposite. The typical spreadsheet calculator...

Remember, the rear shock affects the front and vise versa. A soft rear makes the forks feel stiff. The opposite is also true. Changing just one end at a time (without keeping proper balance) this can throw a tuner off track even if the change would otherwise have been beneficial.

Injection molding is obviously the best way to go for high volume manufacturing. However, for the qty we're probably talking about here it'd be much easier to simply make a clay mockup of the shrouds on the bike (each side) and splash them to make a mold(s). Then just make them out of carbon...

Do you have multitool? That would be the first place to start as there are quite a few On Board Charger parameters MT monitors and logs. I'm assuming the SM has the OBC setup. If not, the standard DCCP has a few quirks that I've seen regarding either not recognizing that the charger is...

I remember those early conversations and information exchanges! Those were fun and exciting times. Not that I've stopped digging deeper into the bowels and innerworkings of these great bikes but some of the excitement is gone. I really wanted to see an Alta compete at the Pro level at our...

I believe the original question was whether it was possible to put an A pack into a R bike. Makes sense, R packs are essentially impossible to find (unless someone parts out their bike) while there are a few people which acquired a small number of complete A packs during the liquidation. Given...

Work yes, but still very possible. The interlock loop (two wires) is fairly easy to change, I’ve done it on the bench many time (the R is quite a bit simpler). My biggest concern is the way the firmware recognizes the type of pack installed and then adjusts the motor control accordingly. It...

If it was the only option it could be made to work with a few harness/connector changes.

I agree. There’s some nonlinearities but it’d give a better picture. With the exception during gear changes I suspect the charts would be much more comparable.

The Alta controller uses pretty sophisticated field weakening algorithms to reduce the negative affects of back EMF. That's the primary reason they're able to get the motor to spin as fast as it does. Otherwise, no way. Yes, voltage sag with the Alta is one of the biggest single limiting...

Ok, got it. You're looking to attenuate the throttle under certain conditions, kinda a limp mode, even if the throttle is substantially higher (more open). In this case I'd say a simple resistor switched inline with the analog signal of the throttle would certainly reduce the output signal by...

The throttle circuit has both analog and digital components. However, I'm not sure what you'd accomplish by modifying the signal that a good right hand couldn't do better. The goal of a clutch is to decouple the speed of the motor (crankshaft) with respect to the speed of the countershaft for a...

Just take your cover off and the chip is right there. Or search the forum as it's pretty common knowledge. Unfortunately, it doesn't tell you much (if any) about the actual code. I've got several inverter chips purchased from supply houses as they've been discontinued as I remember. Again...