private void CalculateRevs()
{
// calculate engine revs (for display / sound)
// (this is done in retrospect - revs are not used in force/power calculations)
CalculateGearFactor();
var gearNumFactor = m_GearNum/(float) NoOfGears;
var revsRangeMin = ULerp(0f, m_RevRangeBoundary, CurveFactor(gearNumFactor));
var revsRangeMax = ULerp(m_RevRangeBoundary, 1f, gearNumFactor);
Revs = ULerp(revsRangeMin, revsRangeMax, m_GearFactor);
}