[Diy_efi] [off topic] performance meter app

[Fred Cooke]

I have one car that can stay on the rev-limiter through 5th if you can keep
it from ending up in a tree while doing it ;-)

G-Tech Pro units do exactly this btw, re the shift light. They measure RPM
from batter voltage fluctuations which are tuned via two RPM points that
you hold and set. It can't be THAT accurate, but it seems to work well
enough.


2011/11/9 Ben P <benof1987 at hotmail.com>

> It's also feasable to have an advanced shift light function. Making the
> screen flash at appropriate user defined speeds could be useful as high
> powered cars will show wheel spin on the speedo. I had one car that could
> stay on the rev limiter through second gear, changing accurately to third
> was difficult at best..
>
> ------------------------------
> From: benof1987 at hotmail.com
> CC: diy_efi at diy-efi.org
> Date: Wed, 9 Nov 2011 13:54:40 +1300
>
> Subject: Re: [Diy_efi] [off topic] performance meter app
>
> I really don't think knowing cd is important. Although cda can be (almost)
> directly measured with a couple of user inputs and I can output a graph of
> hp required to cruise vs speed (which is what you implied, no?)...
>
> As for a tacho function, it would be easier to input gear ratios manually
> and teach the program to recognise shifts than to use any kind of audio
> feedback, unless you had an unfiltered alternator noise being played back
> loudly through an am radio. (we all know that happens on older cars...)
>
> Thanks for all this feedback, I never realised just how much real useful
> data can be extracted just from an accelerometer and a mass input... This
> tool will quickly become the ultimate performance tool. I haven't seen some
> of these features on any previous app...
>
> ------------------------------
> Date: Tue, 8 Nov 2011 13:12:05 -0800
> Subject: Re: [Diy_efi] [off topic] performance meter app
> From: anisbet at gmail.com
> To: clshore at yahoo.com
> CC: benof1987 at hotmail.com; jonnbell at gmail.com; diy_efi at diy-efi.org
>
> Tach input on the microphone + gear ratios manually input.  This could be
> used for back up calculation of HP/Torque.
>
>
> -Avery
>
> 2011/11/8 Carter Shore <clshore at yahoo.com>
>
> Since you are already capturing the data, and have a platform capapable of
> doing the calculations:
> Capture coast-down, and calculate the HP vs speed.
> Then calculate the aero Cd by subtracting out the extrapolations of
> mechanical drag.
> For 'dyno' feature, allow user to enter correction data like air temp,
> baro, relative humidity, etc.
> Could the camera phone take a high contrast frontal pic of the car, then
> do an estimate of the frontal area based on user input of measurements of
> some distinct linear dimension (ground to bottom of the door handle, etc.).
>
> Carter
>
> --- On *Mon, 11/7/11, Jonathan Bell <jonnbell at gmail.com>* wrote:
>
>
> From: Jonathan Bell <jonnbell at gmail.com>
>
> Subject: Re: [Diy_efi] [off topic] performance meter app
> To: "Ben P" <benof1987 at hotmail.com>
> Cc: "<diy_efi at diy-efi.org>" <diy_efi at diy-efi.org>
> Date: Monday, November 7, 2011, 1:17 PM
>
>
>  Keep us posted!  That looks great.
>
>
> Jonathan
>
> On Nov 7, 2011, at 10:58 AM, Ben P <benof1987 at hotmail.com<http://us.mc1136.mail.yahoo.com/mc/compose?to=benof1987%40hotmail.com>>
> wrote:
>
>   I'm considering writing a performance meter app for my android phone.
> It's about getting the features I want and proving I can more than anything
> else. So these are the features I want to implement :
>
> Vector based (no need for specific phone orientation, just constant
> throughout run)
>
> Graph output with selectable axis (i.e. Speed or time for y axis)
>
> Save/export function
>
> Additional calculations based on accelerometer data and user inputs (dyno
> plot, maximum possible g-circle, etc)
>
> "live" g-circle display
>
> User selectable time splits on both previously recorded and about to be
> recorded acceleration runs
>
> Is there anything else you would like to see?
>
> I don't intend to charge for distribution of this app if I do get it
> finished, although a donate version (possibly with skins or somethingelse)
>
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