biz-da-tech...here is an interesting read for you:
"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."
Make no mistake, i think the dynolicious is a great bang-for-the-buck application BUT like mentioned above, critical things are overlooked...
Btw, a gtech does not only do those things, but it has a PASS software which u can use to analyse ur recorded runs on drag / circuits, record how many G's u r pulling at each and every corner, and overlap runs so u can see how each setting has changed corner g's
man i shud be paid for free advertising
cant blame u for thinking that way, the video did a poor job or conducting the test fairly, they didnt even use the gtech properly, seems more like an product promo than some random non-bias 3rd party testing
since u already have an i-phone, if i were u i would also just get the dynolicious app rather than coming out with 1k plus for a gtech lah....but my aim here is just to clear some misperceptions of certain things
Cheers!
p.s the dynolicious app looks great and detailed too, for the price, it cant be beat
