Dynolicious - Dyno in your pocket

[swamp2]

Reply from the designer of the G-tech in response to the Garage419 comparison between the G-tech and dynolicious.

Hello, my name is Jovo Majstorovic and I have designed all four generations of G-TECH products. I have to say that this video is very upsetting, throwing a product to the ground, that’s not very nice. The entire video seems very biased. However, in this comment, I will try to be as unbiased as I can.

First of all I need to say that I also love my I-phone. It truly is a marvel of modern industrial design and manufacturing, that precision, quality, finish, user interface, all great stuff. In fact I am a big fan of Apple and many of my college friends (Art Center College of Design in Pasadena), work there. While you can pay as little as $200 bucks for an I phone, it should be mentioned that this pricing is heavily subsidized by a two year contract and that the actual price of the I-phone is around $500-700.

Here are a few facts that you may find interesting relative to this video:

Accelerometers in the I-phone are used to determine if the product is moved, rotated etc. They are not calibrated to the precision level that G-TECH accelerometers are. Video neglects to mention that the user has to calibrate the accelerometers. To do this right, is not easy and is temperature dependent. If you are lucky, you did the calibration at the same temperature as your measurements otherwise you will be off. G-TECH accelerometers are robotically calibrated and temperature-compensated, I-Phone accelerometers are not, they don’t need to be, so it’s all up to the user and to do a calibration better then a robot is simply impossible, believe me I know. I have several patents in the field, just go to www.uspto.gov and do a search by my name.

No mention of the roll-out in the video! As all of you more experienced drag-racers know, it all happens right there in the first 60ft and the roll-out is the most important part of it. If you deep-stage on the track and you use a 12” roll-out, the resulting discrepancy can be even bigger than half a second!

No mention of the pitch correction! Pitch is the rotation of the car due to suspension compliance and G-forces. To have the “correct” measurement without correction for the pitch of the car as it rolls down the track is simply blind luck!

1.5Gs on a Mini?! Video indicates that a Mini pulled 1.5Gs. This is simply impossible and is due to what we call kinetic-dump. This is the force resulting from the engine running freely for a period and than dumping that energy on to the drivetrain. Obviously not proper dampening algorithms are used in the Dynolicious software.

I have spent last 15 years on the drag strips and racetracks testing measuring equipment for vehicles and I am here to tell you that this is not as easy as it seems. There is a great deal of variables to contend with. If you neglect the variables and your measurements seem “correct” you were simply lucky! That seems to be the case with the horsepower measurement in the video. Here is why...

It is physically impossible to have the same horsepower numbers on the dyno and in real life. On the dyno the car is strapped and standing still and it doesn’t have to contend with air-resistance. Without the exact aerodynamic drag coefficient and the frontal area of the vehicle it’s impossible to determine the exact horsepower loss due to air-resistance. So to have the same numbers on the dyno and the I-phone is simply blind, unsubstantiated luck!

The I-Phone is great, this Dynolicious app. is also kind of neat, but this measurement method is simply no match for a factory calibrated G-TECH.

With proper calibration service for of each and every customer’s I-Phone, improved software and proper customer support we may have a contender. Thanks for listening.

It does appear that some of the accuracy found by Garage419 may have been getting the right answer for the wrong reason and this phenomena can be very confusing without extensive testing and validation.

[d_dot]

do they make any software remotely like this for the blackberry?

[darkphantom]

Originally Posted by d_dot

do they make any software remotely like this for the blackberry?

Don't know......do you have a) gps or b) an accelerometer?

if you answered yes to any of those, which OS is your phone running?

[synclastica_86]

Originally Posted by DonM3

How does it work out peak horsepower?

You input your vehicle'e weight... include your weight and the weight of everything in you car if you are a type A person and wants to be really precise on everything...

Then you put in the power loss due to drivetrain friction... but this is a problem... how do you find an exact figure?

Anyways... then it computes the power from power = force x velocity and force = mass x accleration... you do the math...

Originally Posted by masmole

I like this app. I played with it all day yesterday, did acceleration runs, and was doing skid pad tests at an empty parking lot last night. It actually works very well in my iPhone and yes it works with iTouch also but not the other iPods. I've found that it records more accurate results only if secured properly. It has to be fixed solid onto a part of the car and not loosely to prevent mounted vibration. It also has to follow the fore-aft axis of the car. I compared results of several runs with my old gtech pro and while I don't believe either device is scientifically accurate, the results for both a comparable, consistent, and accurate enough for practical use to compare the effects of mods and for basic sh1ts and giggles.

Hopefully, some developer will take this to another level and make a version exclusive to the iPhone 3G utilizing its built-in GPS in conjunction with the 3-axis accelerometers to log on-track turn-by-turn telemetry for analysis of your driving as mapped around a track. That would be sick! Fully functional telemetry from your phone. And because it has wifi and 3G, perhaps even the possibility of transmitting telemetry data near-real-time to a web-based server for immediate analysis by someone in the paddock.

With an idea like that... you should be sittin on your super yacht in monaco... what ru doing here?

Originally Posted by mkoesel

I like your ideas. This really makes me want to become an iPhone developer.

Another cool thing that would of course be highly controversial is time-attack on a given pre-determined pre-mapped course on the street. Then, your phone could send the results to a server and compare against others. Never in any high traffic or residential area, of course, coutry roads only. It would like a real-time, real-life video game. But the law enforcement community would have a field day with that. But I'll bet you could still find a cult following for it. Apple probably would not allow it in the store though, unless you made it a trojan horse function in a more politically correct app.

Can the authorities use this as evidence in court to incrimate speeders?

Originally Posted by mkoesel

BTW, as far as mounting the phone in the car securely, this option, mentioned by southlight would seem to be the ideal thing to have:

http://www.m3post.com/forums/showpos...1&postcount=86

I know this is kind of off topic, but I wonder how we can get this installed in the US?

Will you still be able to use the screen of the iPhone after its docked?

[baarii]

Do these look right?? i glued the iphone to the horn
This is the free version.





Does anyone have a pocketdyno vs dynolicious comparison?

[aus]

By buddy got the free version and it's pretty damn good. It read his M Coupes HP at 270whp, which is 326 with a 1.21 correction factor.

[baarii]

ok so i just paid $13
first go..
btw my cars a dct






will do some more later

[Subw00er]

BTW if anyone wants a Gtech Pro device, I have one for sale. Make offer.

[gr8000]

Originally Posted by baarii

ok so i just paid $13
first go..
btw my cars a dct






will do some more later

Was this on LS? If not on what DCT, DSC, throttle and suspension settings were you on for this run?

[baarii]

Mdm, Edc 1, Dct 5

[Subw00er]

hey i bought this and am trying it. what did you guys use for weight? I used 3450 (adding me and matts etc). for drivetrain loss, I have no idea, so I used 0%. Someone says 12% I think.

What # should I be getting for WHP?

[Wads]

Originally Posted by Subw00er

hey i bought this and am trying it. what did you guys use for weight? I used 3450 (adding me and matts etc). for drivetrain loss, I have no idea, so I used 0%. Someone says 12% I think.

What # should I be getting for WHP?

If drive train loss is 12% doesn't that mean WHP will be 414bhp minus 12%? ie. around 360ish

[JIO]

Originally Posted by synclastica_86

You input your vehicle'e weight... include your weight and the weight of everything in you car if you are a type A person and wants to be really precise on everything...

Then you put in the power loss due to drivetrain friction... but this is a problem... how do you find an exact figure?

Anyways... then it computes the power from power = force x velocity and force = mass x accleration... you do the math...



With an idea like that... you should be sittin on your super yacht in monaco... what ru doing here?



Can the authorities use this as evidence in court to incrimate speeders?



Will you still be able to use the screen of the iPhone after its docked?

Yes, after it's docked, you can still access all the functions. I have one in my '09 coupe and it works great. I did order the smartphone integration option and the plug in adapter looks slightly different than the one pictured. It's a tight fit for the phone and so if you have a case over the phone, you have to remove it. I get all the phone functions and all the music. It works great. It also ties into the car's antennas, so the phone's signal is a bit better than just leaving it in your pocket. The only problem I have is that I keep forgetting my iPhone when it's plugged into the cradle. If you also plug in another iPod with the USB connector, the music plays on the iPod and not on the iPhone. Since the car has a hard drive, I have all my music stored on the HD of the car, so I never use my iPhone for music....but I could.

[mixja]

Originally Posted by Subw00er

hey i bought this and am trying it. what did you guys use for weight? I used 3450 (adding me and matts etc). for drivetrain loss, I have no idea, so I used 0%. Someone says 12% I think.

What # should I be getting for WHP?

Weight is too low - you'll get low readings with that weight. The factory quoted weight for a 6MT Coupe with 165 lbs for driver and luggage, and a full tank of gas is 3630 lbs. I would use a base weight without gas of 3380lbs, then add on gas and driver/passenger weights.

Your WHP numbers will also vary depending on termperature, air pressure, humidity, elevation etc...

Here's a run I just did recently - stock DCT, temp 25C, perfect surface (brand new race track), launch control @ 5500RPM...



0-10 km/h: 0.47 sec
0-20 km/h: 0.87 sec
0-30 km/h: 1.21 sec
0-40 km/h: 1.57 sec
0-50 km/h: 1.96 sec
0-60 km/h: 2.43 sec
0-70 km/h: 2.88 sec
0-80 km/h: 3.31 sec
0-90 km/h: 3.85 sec
0-100 km/h: 4.50 sec
0-110 km/h: 5.13 sec
0-120 km/h: 5.82 sec
0-130 km/h: 6.61 sec
0-140 km/h: 7.47 sec
Elapsed Time



60': 2.14 sec @ 51.3 km/h
330': 5.40 sec @ 116.5 km/h
1/8 mi: 8.13 sec @ 146.2 km/h
Miscellaneous



Max Speed: 142.4 km/h
Max Acceleration: 0.79 G's
Peak Horsepower: 375 HP

[brava09]

what's the correct settings for rollout, for speed tests and for distance tests?

if I set 1'' for rollout (speed test) I get much better results than if I set 0''

Does anyone know the meaning of these rollout settings?

[sylonien]

I've floored my 335i multiple times before, it was quick but this feels completely different. Guess the V8 420hp does make a difference after all!

Well, after owning it for 6 months. I finally build up confidence and floored it today, twice.

MDM, Sport+, EDC 1, Toyo T1 Sport tyres, ambient 10C degrees.
Supersprint Race backbox, 2nd cat/resonator delete.

Only thing is that its from an app (dynolicious), not sure what % to set the power train loss, the weight of the car (I made a rough estimate).

Seems pretty accurate? I've seen some dyno that says 345~ WHP stock (91 RON),
with my exhaust mods, 99 RON V-Power Nitro+ and run from an app.
I'm quite surprised that it predicted 379 hp. Give or take and my 5.11 sec 0-60
with a ever so slight downhill gradient (cheating!) and a slight bad start.
Had a slight jolt.

1st and 2nd gear all the way to 8000 rpm. Oh + 1 passenger.

What should I set drive train loss and weight at?!





Oh and a added bonus... new video.