So - you're telling me, I can turn my kids IPod Touch into a Dyno?

 

I think for $12.99!

 

Yes it works great.

The speed is NOT calculated by GPS. It is all Motion sensors (accelerometers).
The iPod Touch does not have GPS capability and the speed calculation is accurate.

 

I've done a few runs yesterday and got 19hp constantly.
One of the runs showed 22hp, but I bumped in a couple of potholes right at the beginning which threw the thing off.
I am using 0% drive train loss to read hp on the wheel.

Marcelino, do you have an idea of what is the percentage for drive train loss for the KLX?

 

Maves, thank you. this is good stuff, I really want to see what it says my bike does. Which phone do you have?

David

 

What are the inputs needed? I think I saw weight mentioned - how accurate should that be?

 

I'll get it and see whats up....I'm all about the apps. LOL

 

Uhhhhhhh it costs, and I dont pay for apps, so I guess thats the end of that.

 

Here you have it :
The top red one is SAE corrected power at the cranckshaft or what the manufacturers advertize .
The lower blue one is gearbox output .
The next violet-ish looking one is at the rear wheel .
The last one , in black is in the dyno's drum .
The biggest loss is in the tire so remember not to use knobbies on the asfalt and no slicks on dirt roads .
On a side note the applications for the Android will not start untill it gets a GPS lock . Having an accurate speed input can ony be beneficiary .
Here is the power graph :

 

I have an iPhone. Yes, I am also curious to see what numbers you'll get with the 351.

Oh come on... Same cost as a lunch.

Thank you. So, ~9% drive train loss, right? Entering that in Dynolicious, it re-calculates my bike's results to 21hp.