# 6 cylinder ECU

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Any question there Matt?

I'll delete the thread if it was created by accident.

Cheers.

Jurgen

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• 4 weeks later...

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A question relating to calibrating a speed sensor.

I have a speed sensor calibration number of 191

where my GPS shows a maximim of 227kmh.

Â

Is there a maths equation from these number to correctly calibrate the speedo reading?

Â

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Calibration Number = (Number of Sensor Teeth / Wheel Diameter) * 31.83. Note that wheel diameter is in meters (m).

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• 2 weeks later...

Hi Matt

191 x (330 / 227)

= 277.7

Â

The full calculation for a speed sensor mounted on the gearbox tailshaft.

CAL# = pulses per 100m

= (Pulses per revolution x 100 x Diff ratio (eg 3.7) ) / wheel Diameter(m) x Pi

Â

For exampleÂ with 0.7m diameter tyre, 3.7:1 Diff, 4 pulses per revolution sensor

CAL# =Â (4 x 100 x 3.7) / (0.7 x 3.1416)

= 673 (pulses per 100m)

Â

You willÂ need to know the pulses per rev from your gearbox though.Â Google might beÂ the best bet. It is always a round number though.

Â

Jeremy

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