iPhone Dyno App

[glyphon]

Sorry if this is the wrong section, but wasn't really sure where to put it.

quote from the rx8 club forum i frequent...

Wow, I didn't know where to post this one. It warrants more important status than just being in the iPhone thread.

Check this out, an application called "Dynolicious" for your (my) iPhone. It cost a whopping $12.99 and it is actually a Dyno!!!!
===============
http://www.dynolicious.com/images/screenshot1.gif

http://www.dynolicious.com/

Dynolicious is the first automotive performance meter available for the iPhone and iPod Touch. Dynolicious uses the hardware built-in to your iPhone to measure the performance characteristics of your vehicle. No external wires or equipment is necessary, simply slip the iPhone into a cradle or cupholder and go!

Some of the performance metrics Dynolicious can measure:

0-60 Acceleration
1/4 Mile Elapsed Time
Lateral G's
Horsepower

Unlike other accelerometer-based performance meters, Dynolicious uses the advanced data-handling and display capabilities of the iPhone to make the most of your performance testing. Dynolicious maintains a history of test runs, showing you averages and trends in your results. Dynolicious also allows you to enter modifications performed to your vehicle, and will instantly show before-and-after results to easily identify gains or losses.
================

Performance Measurements
0-60 MPH
Other Speed Tests (0-10 MPH through 0-100 MPH in 10MPH increments)
Quarter Mile Elapsed Time
Quarter Mile Trap Speed
Elapsed Time and Trap Speed for standard intervals (60', 330', 1/8 Mi, 1000')
Lateral G's (current and peak)
Braking G's (current and peak)
Wheel Horsepower
Estimated Engine Horsepower

Results Presentation
Realtime Speedometer and Graphs
Realtime graphical skidpad display
View results for latest test run or any saved run
View averages based on vehicle, date, or modification
Compare results between vehicles, dates, or before-and-after modifications

Configuration
Rollout 0" to 24" (separate settings for 0-60 and Quarter Mile tests)
Stores vehicle weight and drivetrain efficiency in your vehicle's profile
Calibration routine gets the maximum accuracy possible with the built-in accelerometers

Accuracy
0-60 MPH: +/- 0.08 sec*
Quarter Mile: +/- 0.10 sec*, +/- 1.5 MPH*
*Results based on preliminary testing. A detailed accuracy analysis using professional timing equipment at a regulation dragstrip will be posted soon.

It's all in the Gees
Dynolicious utilizes the accelerometer built in to your iPhone or iPod Touch to sense the motion of your vehicle. This data is sampled as many as one hundred times per second, developing a detailed picture of the car's acceleration. This information is then used to determine the speed of the vehicle and the distance travelled. Due to the unique hardware integrated into the iPhone, this can all be done with no setup, wires, or extra equipment!


and my limited experience with it this morning...

skid pad of my morning drive...well, not all of it. i opened the skid pad while sitting at the red light to turn onto the on ramp, so, it doesn't have the section from home-highway. notice the low acceleration g reading...still in the break-in period :(

http://www.mcx7.com/attachment.php?attachmentid=1099&stc=1&d=1217515551

and here's the exit ramp that brought about the .82 lateral g peak...
http://www.mcx7.com/attachment.php?attachmentid=1098&stc=1&d=1217515434

[MAZOOM]

Wow, all the more reason to get an iPod Touch

[JBCX7]

if this gives accurate readings im PUMPED. how can u get this on an ipod touch?

[glyphon]

you buy it through the App store in iTunes on the App store...app, er, on your iphone/ipod touch.

[JBCX7]

flawless. def doing this when i get home

[astraelraen]

Except you've gotta update to the 2.0 software to get/use any of the apps from the Itunes store.

Is there a jailbreak for the 2.0 out yet? I'm still running 1.4 jailbroken with loooooooooooots of awesome free apps. Not to mention the fact that I've probably spent 5+ hours customizing, etc which will all be lost with an update.

[glyphon]

Is there a jailbreak for the 2.0 out yet?

yes.
http://blog.iphone-dev.org/post/42931306/pwnagetool-2-0-1

disclaimer, i haven't used it, so i can't comment on how well it works. so, that's up for the jailbreakers to research, i'm just sharing the knowledge :)

[Raider]

I would like to know how it measures HP

[glyphon]

you program in the weight of the vehicle (and all the stuff in it), and using the weight and acceleration, it can calculate the wheel hp. and if you know the drivetrain loss, you can program that in and it will calculate the crank hp.

[LuckySeven]

its amazing what we can do nowadays...

[glyphon]

for the curious...

The ET method
This method uses the weight of the car and the time it took that car to travel 1330 feet (¼ mile).
hp = weight / (ET / 5.825)^3


The Trap-speed method
This method uses the weight of the car and the speed at which the car completed the quarter-mile run.
hp = weight * (speed / 234)^3

obviously, the calculation is only as accurate as the variables, and most unknown one is likely a good weight reading, but it will still be close. and if you have all the info, you can do the calcs for both methods, and average them, and in theory get a more accurate hp number

edit
just to be clear, i don't know if those are the calculations that this program is using, just that those are 2 well know calculations, that are reasonably accurate.

[CRD]

I believe this works like the G-tech, internal acelometer or not? I touch and Iphone both have gyro-acelometer same thing the g-tech haves.

[JBCX7]

ok folks so after the 9$ update to 2.0, and the 12$ app, i now have a DYNO on my iPOD touch! idk how to take screen shots on this tho...
btw anyone know out drivetrain loss %?
weight i looked up at 3710 does that sound right?

[CRD]

ok folks so after the 9$ update to 2.0, and the 12$ app, i now have a DYNO on my iPOD touch! idk how to take screen shots on this tho...
btw anyone know out drivetrain loss %?
weight i looked up at 3710 does that sound right?

I'm getting my ipod touch today, so let me know how it works, I still have some 0-60 and 1/4 mile runs from my dashhawk saved and I can compare them.

[MAZOOM]

AWD is like 3900lbs+gas+driver

[JBCX7]

http://www.caranddriver.com/buying_guide/mazda/cx_7/2007_mazda_cx_7/mazda_cx_7_grand_touring_awd+tab-trims.html

says 3710 here... i weigh in at 170, how much does a full tank weigh? 18gal. + ~10lbs? 180 lbs??

[CRD]

I don't know but this 1/4 posted on the product website is kinda OFF

14.48 sec @ 93.1 MPH as a 1/4 mile reading would be perfect, but 16.73 sec @ 100.9 MPH is way off unless this car used NOS almost finishing the 1/4 mile.

http://www.dynolicious.com/results3.png

[JBCX7]

i dont think it had nitrous and was running 16's...
did it say what car this was for?

[MAZOOM]

http://www.caranddriver.com/buying_guide/mazda/cx_7/2007_mazda_cx_7/mazda_cx_7_grand_touring_awd+tab-trims.html

says 3710 here... i weigh in at 170, how much does a full tank weigh? 18gal. + ~10lbs? 180 lbs??
FWD is 3710, AWD is in the 3900lbs range, so that is wrong.

Baseline with you and the car is 4080lbs. (3910+170)

8 gallons of gas goes up to 72lbs, a full tank is about 162lbs.

So, Full tank of gas, 4242lbs.

[CRD]

i dont think it had nitrous and was running 16's...
did it say what car this was for?

nope, but to be on the 100mph range that's 13's no 16's. weird!!!

[CRD]

FWD is 3710, AWD is in the 3900lbs range, so that is wrong.

Baseline with you and the car is 4080lbs. (3910+170)

8 gallons of gas goes up to 72lbs, a full tank is about 162lbs.

So, Full tank of gas, 4242lbs.

You have to put the weight of the car ONLY, if this system works like the GTECH wich I it does, you only put the weight of the car, no gas or your weight.

[MAZOOM]

You have to put the weight of the car ONLY, if this system works like the GTECH wich I it does, you only put the weight of the car, no gas or your weight.
In order for it to work properly, you need to put in all of the weight.

[CRD]

In order for it to work properly, you need to put in all of the weight.


At least on the G-Tech putting all the weight on it it gaves you wrong readings, makes the car faster than it's

[glyphon]

I don't know but this 1/4 posted on the product website is kinda OFF

14.48 sec @ 93.1 MPH as a 1/4 mile reading would be perfect, but 16.73 sec @ 100.9 MPH is way off unless this car used NOS almost finishing the 1/4 mile.


couple of things to consider about this...might not have been a "typical" drag launch. could have been an aggressive, yet not clutch destroying launch from 7k. also, regular road asphalt isn't as sticky as what's used on a drag strip, so launches would typically be a little slower to keep from spinning the wheels. or, could have been a rolling start.

all possibilities to explain what is displayed.

[MAZOOM]

At least on the G-Tech putting all the weight on it it gaves you wrong readings, makes the car faster than it's
Not adding in the weight of the driver and gas will give you inaccurate readings.

[JBCX7]

Not adding in the weight of the driver and gas will give you inaccurate readings.

+1 definately. all of the calculations this app does for you revolve around the information you set it to. it doesnt know anything about the car. you could put it in ur pocket and run around and measure the gforces if you wanted to..

im curious about how the ipod touch knows when it hits 60mph, 1/4 mi. etc... it doesnt have gps like the phone does...:o

[glyphon]

im curious about how the ipod touch knows when it hits 60mph, 1/4 mi. etc... it doesnt have gps like the phone does...:o

1st gen iphone doesn't have gps either, and the program works on it too.

i'm guessing it is all calculations based off of the rate of acceleration as measured by the accelerometers, which all 3 devices have.

[CRD]

+1 definately. all of the calculations this app does for you revolve around the information you set it to. it doesnt know anything about the car. you could put it in ur pocket and run around and measure the gforces if you wanted to..

im curious about how the ipod touch knows when it hits 60mph, 1/4 mi. etc... it doesnt have gps like the phone does...:o

It works the same way the G-Tech Pro does, using the acelometer.

On the G-tech you only put the weight of the car. I guess the G-tech by default will add the weight of gas and person driving. When I had the g-tech on my other car, on the track we had the same 1/4 mile time, but mph were 1-2 mph higher on the g-tech. If I added let's say 100lbs to the actual weight of the car on the g-tech, I will get faster times readings on the g-tech compared to the real 1/4 mile time at the track. That's why the always put the % of +/- of error.

At least the g-tech worked perfectly same 1/4 numbers when I had only the weight of the car only. GAS and YOUR weight I bet is been added to that number you add by default on a estimate numbers set by them. Unless this softwares ask you for the weight of the car and weight of gas and your weight, you should not put it.

I still see the 1/4 mile times way off on the screenshot they have on their website. 100mph is for a 13's 1/4 mile time.

[JBCX7]

wow. cant wait to try this app on a plane during takeoff! i wonder if at a constant speed it can tell how fast its going, im thinkin it would read zero as its accelerometer is meant to pick up accelleration...

Apple... if only they make cars.

[CRD]

wow. cant wait to try this app on a plane during takeoff! i wonder if at a constant speed it can tell how fast its going, im thinkin it would read zero as its accelerometer is meant to pick up accelleration...

Apple... if only they make cars.

I would love apple to make a Itouch like Double Din Head units with navigation :D

[JBCX7]

On the G-tech you only put the weight of the car. I guess the G-tech by default will add the weight of gas and person driving.

If I added let's say 100lbs to the actual weight of the car on the g-tech, I will get faster times readings on the g-tech compared to the real 1/4 mile time at the track.

GAS and YOUR weight I bet is been added to that number you add by default on a estimate numbers set by them. Unless this softwares ask you for the weight of the car and weight of gas and your weight, you should not put it.

I still see the 1/4 mile times way off on the screenshot they have on their website. 100mph is for a 13's 1/4 mile time.

k didnt see u posted 37 sec b4 i did, ok so i think you may have a valid point, just wanna understand u crystal clear..

1. times r gonna b diff if a 90 lb vs. 350 lb person are driving. how does gtech work with the car? how would it know how much u weigh + lbs of gas in ur tank?

2. when u say "If I added let's say 100lbs to the actual weight of the car on the g-tech" do u mean entering in the weight + 100lbs into the system? or adding a physical 100 lbs into the trunk of the car, and the gtech runs it thinking the weight hasnt been altered.?

3. when you say "GAS and YOUR weight I bet is been added to that number you add by default on a estimate numbers set by them." who is them? the dealer? so u think "curb weight" is measured with a full tank, and a generic driver weight?

4. and as for that 1/4 mi time it looks like the driver waited 3 sec after the clock started or something... maybe a 5 second turbo lag lol

[Shaz]

I would love apple to make a Itouch like Double Din Head units with navigation :D

That would be great. I will be getting my 3G soon and ditching my POS Treo and the POS Verizon network. I will get this app and impress friends

[CRD]

k didnt see u posted 37 sec b4 i did, ok so i think you may have a valid point, just wanna understand u crystal clear..

1. times r gonna b diff if a 90 lb vs. 350 lb person are driving. how does gtech work with the car? how would it know how much u weigh + lbs of gas in ur tank?

2. when u say "If I added let's say 100lbs to the actual weight of the car on the g-tech" do u mean entering in the weight + 100lbs into the system? or adding a physical 100 lbs into the trunk of the car, and the gtech runs it thinking the weight hasnt been altered.?

3. when you say "GAS and YOUR weight I bet is been added to that number you add by default on a estimate numbers set by them." who is them? the dealer? so u think "curb weight" is measured with a full tank, and a generic driver weight?

4. and as for that 1/4 mi time it looks like the driver waited 3 sec after the clock started or something... maybe a 5 second turbo lag lol

1) I guess they estimate the gas weight on a half tank, I don't really

2) When I used to add the GAS and my weight to the G-tech I weight it 220lbs at the time, I got different results than the track times. I took my g-tech to the track always to compare and the only weight on the G-tech was the car weight, and I always was on the same 1/4 mile time only the MPH were off on the G-tech 2-3 mph faster. But if I added my weight and estimated gas weiught on the g-tech, it will show faster 1/4 mile time on the g-tech compared to the track times, that's why I always only used the weight of the car only.

3) default by the G-tech company, I don't know this for sure, but it makes sense, for me there is more people that race car at the track on the 150-200lbs, is very rare seen drivers 90lbs or 300lbs. Also on the track they always have 1/4 to 1/2 tank of gas , so I guess g-tech people estimates 1/4 gas to 1/2 gas weight on a tank using a standard size gas tank 15gallons+/-.

I have been on the track racing since 1998 till 2005 and to have those numbers , that haves to be the worse race ever. :D

[CRD]

I just bought the app for my itouch and on this software it ask you for weight of the car, including occupants and cargo. On the g-tech you only add car weight that's it.

I haven't tested the software yet but looks nice.

[CRD]

I just made a run to test this software, I located my itouch on the floor of the car with the LCD facing up, holded in place so doesn't move around.

Total weight 4,020lbs CX-7 Sport model

3,710 lbs car weight
25 lbs sound insulation
250 lbs my weight "I'm tall" :D
29 lbs half of the 1/4 tank maybe 3 gallons of gas
26 lbs (2) audio amplifiers on the back ( no sub box)


RESULTS:

Acceleration/sec
0-10 MPH = 1.25
0-20 MPH = 2.54
0-30 MPH = 3.78
0-40 MPH = 5.28
0-50 MPH = 6.91
0-60 MPH = 9.14
0-70 MPH = 11.36
0-80 MPH = 14.49



ELAPSED TIME

60' = 3.10 sec @ 23.4 MPH
330' = 7.59 sec @ 52.4 MPH
1/8 mi = 11.23 sec @ 68.9 MPH
1000' = 14.31 sec @ 77.9 MPH
1/4 mi = 16.94 sec @ 86.3 MPH

Horsepower @ wheels = 154

PS: Take off was very simple and performance wasn't that great compared to other runs I have made on the past. Numbers seem correctly.

[JBCX7]

ur only makin 154? sounds low doesnt it? i have the app but im still running my MPG tests drivin around like an old grandma so until my next fill up ill be doing skidpad tests for fun. by early next week ill get some ipod touch dyno stats to compare.

[CRD]

ur only makin 154? sounds low doesnt it? i have the app but im still running my MPG tests drivin around like an old grandma so until my next fill up ill be doing skidpad tests for fun. by early next week ill get some ipod touch dyno stats to compare.

Is not that low, you have to remenber that the 154 is at the tires. plus my take off was not great. I need to test more too, but the numbers seem ok for the run I did, witch was the worse I have made in a long time.

But I didn't want to test more because my oil change is due 2,000 ago and rev to high scares me a little.
I'm changing my oil this week and the I will test more

[Sunlokyee]

Guys from Garage419 decided to test out the iphone dyno app and compared it with the G-Tech Pro.

http://gizmodo.com/5034542/13-iphone-app-faces-off-against-embarrasses-150-dedicated-dynometer

[banjo76]

Does anybody know if it can be set to use metric?

Banjo

[banjo76]

im curious about how the ipod touch knows when it hits 60mph, 1/4 mi. etc... it doesnt have gps like the phone does...:o

It knows istantaneous acceleration. An algorithm inside the software istantaneously integrates acceleration data to yield istantaneous speed data.
Same thing for distance, another integration from speed and you get the distance data.
BTW an accurate accelerometer is WAAAAY more accurate than the GPS when it comes to speed calculation.

Banjo

[Airic]

so has anyone figured out how to delete a vehicle, or delete stats?

[glyphon]

swipe your finger across it, just like with deleting single emails.

[CRD]

Does anybody know if it can be set to use metric?

Banjo


Program can be set to :

MPH or km/h
HP or kW
lbs or kg

[Airic]

There is a new app called rev lite, it isnt fully developed yet but it will connect to the OBD 2 connector. Its will be comparable to the dash hawk from what I can see. I wonder if they can really get the iphone/ipod to connect to the car using the iphone usb port.