Pocket Dyno- The iPhone App Every Blaster Owner Should Have!

[Quadrider10]

ok, so ive been using this app for a long time now. its called "Pocket Dyno" and basically it measures ur vehical's speed, Wheel HP, and a bunch of other really amazing things, and its also extreamly accurate! Its priced at $12 on the app store, and there is also a FREE one too! check it out! its really kool! I:II:II:II:I

 

[Quadrider10]

bump.......................................

 

[Prime]

How does it measure wheel speed, HP, etc.?

 

[blasterdemon7]

Just downloaded it. Will have to try it out tomarrow.

 

[yamaha28]

How does it measure the HP?

 

[Paulie B]

Sounds very interesting. I need some feedback from you guys on it first.

 

[Quadrider10]

How does it measure wheel speed, HP, etc.?

I'm am not comedy shute, but ilu need to enter the bike and riders weight, and I thginl it decides that by ur acceleration and speed or something

Just downloaded it. Will have to try it out tomarrow.

How does it measure the HP?

I have never tried it on my blaster yet, cause it still not running, but I tried it on my mom car, brothers car, and my RC car, and it worked amazingly. As soon as I get my bike done Oma try it too!

 

[Quadrider10]

It keeps logs of everything too; so if u buy new parts and would like o see if there is any improvements, u got a bunch of graphs to look at!

 

[Quadrider10]

If u guys want another app to compare it too, u can get "Max Speed" this app only measures ur speed by gps and where I've been. But to compare it, it's ok. Pocket dyno is brlettwr. I've tried this one in my at too and ehh. It took a little while to calibrate it self.

 

[Quadrider10]

For the best results, u kinda want it as flat as possIble. So I would tape the phone on the seat between my legs. And also as u get to ur max speed at wot in 6th, and ur not going any faster, hit the brakes so it will counter blance and stop the test. Other wise it's a little in accurate on the speed and HP. Just a. Little tip.

 

[slickerthanyou]

sounds like a cool app to toy with, but no way it's accurate, if so all the $50,000 dyno's out there would be obsolete!

 

[sicivicdude]

You program in AUW (all up weight) and it uses the phone's accelerometer and GPS tracker to figure out speed and acceleration. HP can be *loosely* calculated by knowing the weight of something and seeing how fast it can accelerate. I say loosely because there are A LOT of variables that it doesn't take into consideration like traction losses.

There is a similar unit that suction cups to the inside of a windshield in a car and doesn't the same basic thing...

G-TECH/Pro Homepage

 

[blasterdemon7]

I've seen the G tech before but never really trusted in them to spend the money.

 

[sicivicdude]

I've seen the G tech before but never really trusted in them to spend the money.

Same here.

The idea is sound..... the more power you have the faster you'll be able to accelerate (at least in theory leaving out the MAJOR drawbacks in a simple system like this like accounting for tire spin) so by measuring G forces and overall speed it can "calculate" the horsepower.

I too, am not a believer that the drawbacks to that system are worth the price. I have seen it used with success and it DOES work BUT you also don't have anything to compare it to because it cannot work while the vehicle is also sitting on a dynamometer....

 

[DirtDiggler]

I think it would be a great tool for us shade tree mechanics and tuners .
If you have a place to tune your bike where the conditions are the same all the time you can remove as many variables as possible . I can see this working fantastic for upgrades and if the phone app will work while it's in your back pocket , it's truly an " Assdyno " lol.
GPS is scary accurate , I got a Tom Tom 2 Xmas's ago and when I use it for road trips , the posted speed limit is displayed on the screen and when I pass a speed limit sign the tom-tom reacts instantly matching the posted limit and it tells me my exact speed limit and it's matched perfectly to my speedo on the truck . I know it has to be right because when I swapped to 35" tires my speedo was off and had to be re-programmed.
I love my iPhone 4 , Its replaced a ton of stuff in my life .

 

[DirtDiggler]

Sicivic , you are the leader in brains around here by a long shot .
Wouldn't there be a tire spin formula you could factor in ?
Take rpm ( wich can be recorded with a device , my timing light will inductively read it )
And apply that to each gear ratio in the transmission and of course the final drive ratio?
And of course calculate wheel and tire size . So theoretically you could see how many rotations your tires should be spinning per second with zero wheel spin . All of those numbers will never change unless you change sprocket and or wheel combinations .
What do you think ? Yay or nay?

 

[sicivicdude]

Sicivic , you are the leader in brains around here by a long shot .
Wouldn't there be a tire spin formula you could factor in ?
Take rpm ( wich can be recorded with a device , my timing light will inductively read it )
And apply that to each gear ratio in the transmission and of course the final drive ratio?
And of course calculate wheel and tire size . So theoretically you could see how many rotations your tires should be spinning per second with zero wheel spin . All of those numbers will never change unless you change sprocket and or wheel combinations .
What do you think ? Yay or nay?

If you wanted total slippage losses across the entire system, you could pickup the timing signal from the trigger coil and measure rear end speed and figure out how much slippage there is "down the line"

If all you wanted was wheel spin data it would be easier to attach a magnet to the sprocket hub and use a magnetic pickup attached to the top of the swingarm (or carrier) that would register each rotation.....

Data could be analyzed after the fact and overlayed over top of the GPS speed data to get a wheel spin coefficient. Be pretty interesting to see how much you lose with just the rear wheels throwing sand/dirt....

 

[Quadrider10]

sounds like a cool app to toy with, but no way it's accurate, if so all the $50,000 dyno's out there would be obsolete!

You program in AUW (all up weight) and it uses the phone's accelerometer and GPS tracker to figure out speed and acceleration. HP can be *loosely* calculated by knowing the weight of something and seeing how fast it can accelerate. I say loosely because there are A LOT of variables that it doesn't take into consideration like traction losses.

There is a similar unit that suction cups to the inside of a windshield in a car and doesn't the same basic thing...

G-TECH/Pro Homepage

I think it would be a great tool for us shade tree mechanics and tuners .
If you have a place to tune your bike where the conditions are the same all the time you can remove as many variables as possible . I can see this working fantastic for upgrades and if the phone app will work while it's in your back pocket , it's truly an " Assdyno " lol.
GPS is scary accurate , I got a Tom Tom 2 Xmas's ago and when I use it for road trips , the posted speed limit is displayed on the screen and when I pass a speed limit sign the tom-tom reacts instantly matching the posted limit and it tells me my exact speed limit and it's matched perfectly to my speedo on the truck . I know it has to be right because when I swapped to 35" tires my speedo was off and had to be re-programmed.
I love my iPhone 4 , Its replaced a ton of stuff in my life .

ok, obvisally its not "on the dime" accurate, but its pretty freaking close. speed may vary by 5mph and same with HP. but for something fun to play with and see what parts make a difference and stuff, its pretty kool! im dying to try it on my bike, but still cant . whoever gets a run with it on their bike, take some screen shots and upload them!

 

[DirtDiggler]

I've got an idea , I have fat bars on my shee , I could make a fat bar pad with a mount for the phone , get a used pad and cut out the center to snugly fit the phone and use some Velcro to hold it down . The pad should also absorb vibration from the bike.

 

[Quadrider10]

thats an idea! i would just tape it to my seat between my legs tho, incase it decides to take a spill, and fall. this way my legs catch it.