Joined: 02 Jun 2006
|Posted: Mon Jun 06, 2011 11:36 am Post subject: i2 Standard data analysis to get MPH from gear voltages?
|I have no gearbox shaft speed sensor, and no wheel speed sensors, but want to overlay road speed in MPH in i2 Standard software.
I have set up a voltage based gear position input on my M800. I have 2 questions, in Datalogging : Other Sensors : Gear Position Voltage what rate of logging do I need to enable for reasonable road speed accuracy in I2 Standard?
Being totally new to datalogging the maths needed to go from RPM, and gear position, to a road speed readout is a bit daunting. Can someone give me a hand please? I *THINK* the info below is enough?
1st gear ratio : 3.00
2nd gear ratio : 2.14
3rd gear ratio : 1.65
4th gear ratio : 1.32
5th gear ratio 1.10
I have drop gears in the gearbox (Tractive sequential ) of 22 driving, 23 driven giving an overall reduction. I calculate this at 1.045 to 1
My diff ratio is 3.545 to 1
My rear tyres revs per mile figure is 829 RPM
I *THINK* i ma right multiplying the two together to get an overall ratio of drop gears and diff ratio of 3.71 to 1??
That's what I have used for now, anyway.
What do I put in as a maths function to get I2 Standard to read road speed in MPH from the above data, and is logging engine RPM and gear position voltage enough to achieve this?
Thanks. I think once I see the procedure I'll be fine to input other values if I change ratios etcetera, it's just i would like to see this demonstrated by someone that knows what they are doing first please