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Old Wed, Jul-30-2008, 03:23:44 AM   #31
Obioban
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I played with this a bunch today, it's AWESOME
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Old Wed, Jul-30-2008, 04:17:20 AM   #32
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Default this is freaking glorious, but anybody else's crashing out?

I just downloaded this and went out for a little drive ...
on ramp, off ramp ... on ramp, off ramp ...

I've actually been dreaming about writing a piece of software like this ever since the day I bought my iPhone. And this implementation, on the very initial release, has just about every feature you could want (skidpad, saving of data for multiple cars, including tracking modifications in order to chart power gains, horsepower estimate using weight and drivetrain loss inputs). It's completely fantastic.

Seriously, while the accelerometers in the G-Tech may be a bit more accurate than those in the iPhone (the iPhone's 3-axis is on one extremely small integrated circuit due to the obvious packaging constraints), what's most important for accurate calculations is that you have accelerometers for all 3 directions (to properly account for the car squatting/diving/leaning as you drive). I'm hoping to see someone do a head-to-head on this soon, but I'm guessing dynolicious will prove to be within a few percent as accurate as the G-Tech. And, hell ... it's just software on my phone, which I have with me all the time anyway.

It does have some bugs though, so I'm hoping they'll ramp up support soon: Mine crashes any time I try to add or edit in "My Ride". And when I try to do the 'Calibration' under "Setup", it just stays on the 'Hold your iPhone steady and level with the arrow pointing up' screen. I'm assuming this calibration is pretty important for accurate readings.

So my few runs today were about a half second slower 0-60mph (on public roads here) than I expected. I'm presuming this is because it's not calibrated.

Anybody else having these issues?
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Old Wed, Jul-30-2008, 08:01:59 AM   #33
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Very curious how accurate this is, I will go out and buy a I-Phone today if this works as well as they claim. Their website sais +/- <.1/sec error to ~100mph or a 1/4mile. I assume this app is very dependent on the weight and drivetrain loss values, What are people using for those?

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Old Wed, Jul-30-2008, 08:20:15 AM   #34
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Originally Posted by 4drdb8gsr View Post
Very curious how accurate this is, I will go out and buy a I-Phone today if this works as well as they claim. Their website sais +/- <.1/sec error to ~100mph or a 1/4mile. I assume this app is very dependent on the weight and drivetrain loss values, What are people using for those?

-Wes
Supposed to be around ~17%.
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Old Wed, Jul-30-2008, 08:42:57 AM   #35
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Supposed to be around ~17%.
Really, That seems wildly inaccurate, that means a 13.72 sec 1/4 mile could read as high as 16.1 or a 4.5/sec 0.60 could show a 3.7sec?

That seems almost useless at a 17% error margin

Their website shows +/- .1sec error. 17% could be a 2-1/2 second error, a huge difference from <.1.sec.

Anyone with actual experience on error %?
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Last edited by 4drdb8gsr; Wed, Jul-30-2008 at 08:47:13 AM.
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Old Wed, Jul-30-2008, 12:40:36 PM   #36
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Originally Posted by 4drdb8gsr View Post
Really, That seems wildly inaccurate, that means a 13.72 sec 1/4 mile could read as high as 16.1 or a 4.5/sec 0.60 could show a 3.7sec?

That seems almost useless at a 17% error margin

Their website shows +/- .1sec error. 17% could be a 2-1/2 second error, a huge difference from <.1.sec.

Anyone with actual experience on error %?
He was talking about drivetrain loss
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Old Wed, Jul-30-2008, 01:00:50 PM   #37
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He was talking about drivetrain loss
have you tested you 0-60 times and hp?

if so let us now how close it may be
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Old Wed, Jul-30-2008, 01:28:32 PM   #38
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0-60 and quarter mile have been very similar to what I do at the drag strip.

HP is going to be very dependent on what you put in for weight and drivetrain loss
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Old Wed, Jul-30-2008, 02:34:23 PM   #39
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0-60 and quarter mile have been very similar to what I do at the drag strip.

HP is going to be very dependent on what you put in for weight and drivetrain loss
any idea what the drivetrain loss is about?

and the weight of the m3 stock without driver?
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Old Wed, Jul-30-2008, 03:05:32 PM   #40
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Duuude I gotta get this app. Anyone running it on the 1st gen iphone?
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Discussing Now I Have To Get a Iphone....Iphone Dyno in the Off Topic Forum - Place to discuss this and that. Note: We also have "request to join" forums: Guns and Fitness.
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