EX Android app

[Hinkelstein]

I think, this is interesting enough to start a new post. I'm playing with the EX arkenstone, here are my thougths:

*Does anybody know how to make screenshots on the Arkenstone? I'm an Iphone guy...*

Seams I can lock the varg by phone.

I find "Pro" features:
on main screen: Trails
on main screen: Maps
in Power Mode "Advanced"
In Settings theres a "Racing Mode"

I now start trial of Pro Mode:

after 3 month trial it is 12,90 Euros /month

maps seams a simple navigation, content is from mapbox? to be honest, seams much simpler than google maps.
trails gives me the possibility to upload gpx data. Looks also pretty simple. Pretty sure I'd use my locus maps.

Power mode IS interesting: I can adjust horse power in y axis by rpm on x axis. So I think this is something like an adjustable power curve, but is to be paid.
I can adjust it different for every 5 power modes

Racing Mode in Settings: I can switch it on. Wow. Don't know.

My first thoughts: The only really interesting pro feature seams for me the power mode adjustments. I'm sure there are better apps for street and trail navigation and I didn't understand the racing feature. I didn't find more and the menu of the app is not so deep that I could have probably missed something.

Don't tell anybody I made Fotos from a screen.

 

[Beagle]

Awesome thanks.

Maps looked really nice in demo vids.

Adjustable power curves here they are, finally!

And so here is the price of pro mode, 13€/month. 150€ per year might be lower than your annual fuel cost?
I know, it's not a vital feature so you can pay extra if you wish to have it.
Still despise the concept of SaaS, doesn't matter if it makes sense business wise.

Don't try racing mode, it's just to lock your bike at 60 or 48 hp for 24h for official competition.

 

[Philip]

Does anybody know how to make screenshots on the Arkenstone? I'm an Iphone guy...*

Screenshots should work by pressing the power and the volume down buttons simultaneously. On Samsung phones you also must release both buttons within 1-2 seconds.

 

[Philip]

Power mode IS interesting: I can adjust horse power in y axis by rpm on x axis. So I think this is something like an adjustable power curve, but is to be paid.
I can adjust it different for every 5 power modes

Now, if only we could tell which RPM we are at in each section of the track...

 

[Beagle]

Now, if only we could tell which RPM we are at in each section of the track...

Oh right, it doesn't display rpm? I guess it was completely useless... before that feature.

 

[OpaTsupa]

Regarding Android screenshots:
You can also record the screen as a video clip.
Swipe down from the top and there should be 'Screen Record' icon. If it's not there, tap the three dots in the upper right corner to find it in settings.

 

[DaveAusNor]

Perhaps RPM is the wrong x-axis as well. Having a throttle percentage X axis would be nice. that way we could customise the power response based on throttle position. For example a nice mellow curve below 70% throttle and then a steeper curve to full throttle.

 

[Hinkelstein]

Perhaps RPM is the wrong x-axis as well. Having a throttle percentage X axis would be nice. that way we could customise the power response based on throttle position. For example a nice mellow curve below 70% throttle and then a steeper curve to full throttle.

I agree. Imho rpm doesn't make too much sense since it is proportional to speed on a single speed bike.

 

[Hinkelstein]

some news:

- Trail mode doesn't like my GPX Files that work fine in Basecamp
- When you press home inside Maps Navigation you have to start over, it doesn't enter Navigation again.

 

[Theo]

View attachment 13333

The red line is basically like a dyno chart of a Varg at full throttle. Like you would expect from a synchronous motor, up to half the rpms there is constant torque, which makes the power curve a straight line with some slope, since
power = torque * rpm * a constant
ane when torque is a constant, too you end up with the equation of a straight line:
power = rpm * a constant
That also means constant acceleration because tractive force = torque / wheel radius.
Then, from half the rpms to maximum rpms there is constant power, which means that the acceleration becomes weaker as the speed increases.
For motocross I’d say that one needs less torque and therefore less power at lower rpms because the maximum available makes the bike oversteering easily; for enduro maybe you want the torque to wheelie easier.

 

[Chadx]

So is Power Mode (the adjustable part) is going to be subscription only? That sucks. I'll never pay a subscription for anything on a powersports or vehicle even though I was looking forward to that feature. Guess I'll just stick with setting horsepower and live with whatever the power curves are associated with that. Less attractive by the day so now I'm even more committed to sticking with my OG Varg for at least until two year warranty is up rather than selling and buying an EX. Blah. I loath subscriptions.

 

[Beagle]

So is Power Mode (the adjustable part) is going to be subscription only? That sucks. I'll never pay a subscription for anything on a powersports or vehicle even though I was looking forward to that feature. Guess I'll just stick with setting horsepower and live with whatever the power curves are associated with that. Less attractive by the day so now I'm even more committed to sticking with my OG Varg for at least until two year warranty is up rather than selling and buying an EX. Blah. I loath subscriptions.

It's very likely the adjustable power curves and subscription are coming for the Varg as well.

I hate SaaS with passion but even I have to admit that 150€ per year (under 800€ for 5 years) is reasonable if you are interested in such features. It means after 3 or 4 years the Stark price would align with KTM (maintenance will be cheaper of course).

Honestly I would rather have them forego the subscription and raise the price OTD but marketing powers think differently.

 

[DaveAusNor]

I wonder if we'll be able to set our power curves under the subscription/ trial and then continue to use them as long as we don't change them. I'd be ok with that. Pay one or 2 months subscription a year to dial in some new settings

 

[Hinkelstein]

The red line is basically like a dyno chart of a Varg at full throttle. Like you would expect from a synchronous motor, up to half the rpms there is constant torque, which makes the power curve a straight line with some slope, since
power = torque * rpm * a constant
ane when torque is a constant, too you end up with the equation of a straight line:
power = rpm * a constant
That also means constant acceleration because tractive force = torque / wheel radius.
Then, from half the rpms to maximum rpms there is constant power, which means that the acceleration becomes weaker as the speed increases.
For motocross I’d say that one needs less torque and therefore less power at lower rpms because the maximum available makes the bike oversteering easily; for enduro maybe you want the torque to wheelie easier.

so how would you configure a throttle curve making it most easy to lift th front wheel with 40hp max? Imho max hp at the beginning? Like shown in the pic?



or would you even go above 40 hp like this`?

 

[Beagle]

so how would you configure a throttle curve making it most easy to lift th front wheel with 40hp max? Imho max hp at the beginning? Like shown in the pic?
View attachment 13361


or would you even go above 40 hp like this`?
View attachment 13363

What do the standard modes look like, for instance what's the "factory" 40 hp power curve?

 

[Hinkelstein]

What do the standard modes look like, for instance what's the "factory" 40 hp power curve?

They are all the same and look like this. Intererstingly the advanced mode setting doesn't affect the standard mode setting, so if you configure 80 hp max in advanced mode the standard mode stays at 60.

 

[Philip]

so how would you configure a throttle curve making it most easy to lift th front wheel with 40hp max? Imho max hp at the beginning? Like shown in the pic?
View attachment 13361


or would you even go above 40 hp like this`?
View attachment 13363

This would feel like you are in the 80 hp mode until 4K or 5K RPM, which is way too fast, probably 40 - 50 km/h.

You should try maximizing only the low-rpm power, the very first 1K RPM point.

 

[Philip]

I wish Stark had shown the Torque plot instead or in addition to the HP plot. The HP plot is confusing and lacks resolution at low RPM.

 

[Beagle]

For easier wheelies I would guess stick to the red curve from the beginning until maybe 2-3k rpm... hard to say if you don't know at which rpm you are when you quickly open the throttle in an effort to lift the front wheel.
Then of course that would be your wheelie map but could cause some issues in other situations.

Does 60 hp standard map hug the red line initially?

Another way to look at it could be to mimick standard 60 hp or 80 hp map at low rpm then revert to something like standard 40 hp for higher rpm. This should get you snappy 40 hp don't you think?

 

[mike61]

I have a TORP TC500 in my Surron Lightbee (72V).
The throttle response is very easy to set with adjusting the curve in the diagram by one finger.
To get a "push" when you open the throttle the first part of the curve must be steep (exponential).
Later linear (proportional). More flat!
This way you can create a kind of "clutch flip" when you open the throttle fast.