0-60 time, 1/4 mile and such -meter on your carPC

**carabuser** · 09-18-2003, 11:50 PM

ok, did a little search, didn't find anything useful, so decided to post here:
there seems to be a lot of software for carpc for different purposes (GPS , ME, etc.) except one (at least i couldn't find any).
Why not write software that would take readings from OBD/OBD2 (using www.obd2.com's soft for example) and give you your 0-60 time, 1/4 and such? I'm pretty sure it's possible, just record the time when you started going, then when you reach 60 mph and so on.
So what do you guys think about it? Does this kind of software exist? If not, why not write one? Since I'm only beginning to program im not much of a help, but the effort and the idea is what counts, right?

**cproaudio** · 09-19-2003, 01:27 AM

obd-ii update rate is about once a second. Your performance time will most likely be inaccurate.

**Sensor** · 09-19-2003, 01:44 PM

Well, if it updates once per second and then interpolated between them, I'm sure it could be accurate enough for showing to your friend in the passenger seat.

I think the problem is that not many of us are connected to the ODB-II's, so you may want to try learning to program that stuff yourself

**cproaudio** · 09-19-2003, 05:33 PM

sorry dude, im not a programmer

**DocBru** · 09-21-2003, 04:00 PM

I'm interested in that too, but is the update interval really only 1 per second? that would be way to slow for realtime performance indicators and virtual dashboards... Is the update speed defined somewhere (sure it is, but does anyone of you know it?)

**carabuser** · 09-22-2003, 01:50 PM

Originally Posted by Sensor

Well, if it updates once per second and then interpolated between them, I'm sure it could be accurate enough for showing to your friend in the passenger seat.

I think the problem is that not many of us are connected to the ODB-II's, so you may want to try learning to program that stuff yourself

slowly but surely I will. hopefullty there are people who are willing to do that also...

**ob1** · 09-22-2003, 11:38 PM

You could also use a GPS for speed data (i have), but it is only once/second as well.

Works better on a track than a drag strip.

For accuracy, you need either an accelerometer or wheel rotation sensors. I have never seen either of these in a format that allows easy PC interfacing, so would require custom hardware as well as software.

**Robocog** · 09-23-2003, 05:27 AM

How about using your HT leads to trigger a sensor going into your soundcard input (giving RPM) and a sesnsor for which gear you are in ?
I have seen Streetdyno and Home dyno on the web and got as far as building the HT lead sensor and giving it to my father to try out on his MG with a Rover V8 shoehorned under the bonnet :-)
http://www.charm.net/~mchaney/homedyno/homedyno.htm
http://www.geocities.com/MotorCity/D...treetDyno.html

Rob

**GingerPrince** · 09-23-2003, 06:16 AM

Originally Posted by Robocog

How about using your HT leads to trigger a sensor going into your soundcard input (giving RPM) and a sesnsor for which gear you are in ?
I have seen Streetdyno and Home dyno on the web and got as far as building the HT lead sensor and giving it to my father to try out on his MG with a Rover V8 shoehorned under the bonnet :-)
http://www.charm.net/~mchaney/homedyno/homedyno.htm
http://www.geocities.com/MotorCity/D...treetDyno.html

Rob

Another option (and better in a way). I've used this software, but my HT leads picked up too much noise. I got round this by tapping off the crank angle sensor on my car, and attenuating with a resistor. This gives a 5 volt spike every 1/6th revolution and is much cleaner than the HT method. A bit of C to make it in a nicer format for home dyno and bobs yer dog!