Feature Request? Performance Meter?

[kbracing96]

I was wondering how hard it would be to add a performance meter type thing to the scan tool for timing 1/4 mile runs. Seen a lot of other devices are doing it, so I though you guys could whip something up. I think it would be handy for seeing if changes you made helped or hurt your performance. Maybe something like a button on the tool bar that you would push that dropped in to a performance gauge that stared logging and had a little green light that said go or something. Could measure your 60', 1/8 and 1/4 mile times and speed stuff like that? Sound plausible?

[TAQuickness]

sounds cool to me. I was thinking along the same lines on my drive to work this morning.

[Black02SS]

I have wanted this for a long time. One of the reasons I bought a G-Tech Pro.

[5.7ute]

While most of the parameters are there to work out your own calc pid. I would like to see how you could filter out wheelspin from the equation. Unless you could have an external trigger for the various points like the 60' 1/8 & 1/4 it would be inaccurate.

[ringram]

Yeah you need an accelerometer to measure G's.
Ive used mine to measure 0-60mph etc, thats easy. The rest is a bit harder.

[redhardsupra]

integrate airmass across smaller rpm intervals, that's powerband right there

[GMPX]

We had a g-sensor in the prototype V1's :eek: , but they cost a fair amount of money and we weren't happy with the testing phase of it.

Cheers,
Ross

[Black02SS]

We had a g-sensor in the prototype V1's :eek: , but they cost a fair amount of money and we weren't happy with the testing phase of it.

Cheers,
Ross
:bash: Thats too bad.

[TAQuickness]

we need to figure out a way to log the Gtech in FS

[Tordne]

Does the GTech have any output?

[redhardsupra]

gtech comp has a serial port on it for dumping data. i dont think it's active while gathering data tho. there are other loggers (race technology AP-22 -- been a long time since i used it) that would dump the instantenous x/y/z gyro's values live as you drive, which can be translated into a velocity vector.

[TAQuickness]

I love it when you talk dirty RHS

[Tordne]

Hmm.. Wonder if there is an opportunity for the serial input on the V2?

[kbracing96]

We had a g-sensor in the prototype V1's :eek: , but they cost a fair amount of money and we weren't happy with the testing phase of it.

Cheers,
Ross
What about just using time and distance like the other OBII tools do? I know wheel spin throws it off, but I got that covered with the little 4x4 button to the left of the steering wheel:D

[redhardsupra]

I spent a lot of time with Chad trying to figure out even a ballpark acceleration using distance/time, and we just dont have enough precision to get it anywhere near close to useful for performance comparisons. 10Hz sucks for performance, IIRC at 120mph you travel about 1.5ft in that time, that's why stuff like mychron 3 gold do 200Hz scanning.

[joecar]

Like RHS said, 10Hz sampling rate is not sufficent for good accuracy on VSS.

Power can computed from VSS by computing dV/dt.

Distance can be computed from VSS by computing the integral of V over time...
EFILive software does not provide an integrate function at the moment.

But both of these operations require better sampling rate than 10Hz (maybe 40Hz would be barely ok, but I don't think so).

At 10Hz, you can get very rough approximations, but any slight irregularity in test conditions will cause the results to skew wildly (because the results are very sensitive to the accuracy of the computed rate of change of velocity).

And, wheelspin and drivetrain deflection would be a problem unique to each vehicle.

[2002_z28_six_speed]

I think it would be a lot of work but at least you woulnd't have to start from a dead stop like you do on the Comp G meter deal. Being since the intial V was known.

Was that sensor shown before in this thread a complete 3 axis sensor?

[emarkay]

I see another market - a stand alone accelerometer, with a thermocouple, and maybe even a GPS enabled atomic clock, that plugs in and gives an output that is 100% compatible with EFILive... Come on R & P you have free time to design it... :)

Call it the Live EFILive - maybe even add an A/D converter and a small condensor mic to add the audio track so they can sync the RPM's to the sound of the car and all that.... And maybe a small webcam interface for 10FPS CGA video frames - say of the throttle plates, the ehxaust tips, the fuel tank, or even the driver's sphincter...

OOh, OOh, and maybe even a few extra 1 bit interfaces for mechanical switches and stuff so mechanical events can be logged to see the lag.... and Bluetooth or IR enabled features so there's no cables from the "box"...

Damn, where's my Flux Capacitor and Oscillation Overthrusters when I need them... :)

[redhardsupra]

I see another market - a stand alone accelerometer, with a thermocouple, and maybe even a GPS enabled atomic clock, that plugs in and gives an output that is 100% compatible with EFILive... Come on R & P you have free time to design it... :)

you're gonna laugh, but i'm building a differential manometer/thermocouple combo that has the ability to log both pressure and temp differences to some arbitrary datalogger...