In today’s motoring world much of the driver’s work is controlled by computers which try for the best fuel and emission efficiencies. While that’s high for many diesels the rev limiter, or redline, can be easy enough to hit with a petrol motor when accelerating through the gears.įormula One V6 engines may run out to 15,000rpm for close to 1000 horsepower and top speeds around 350km/h. Most of today’s road-going petrol engines can rev out to around 6000rpm. What’s the average RPM?Ī modern passenger car cruising down the highway, in top gear, could be running somewhere between 1500rpm and 2000rpm at 100km/h.Īnd a diesel ute idles around 750rpm while in sixth gear sits around 2000rpm for 110km/h. Spirited drivers once had to watch the redline - where the numbers went from black to red - on the tacho.Įxceeding maximum RPMs could blow an over-wrought engine while most modern cars, with computer-controlled engines and transmissions, have an automatic, often jarring, rev-limiter if a driver pushes too hard. High revs in a low gear is for acceleration, high revs in a high gear is for road speed.

In the right gear ratio, high RPMs bring more power and road speed.Įngine torque - the pulling power for getting away from the lights or lugging over big rocks - is found a bit lower in the rev range.Īn engine’s speed is governed by the amount of throttle applied, road speed is then governed by those RPM and a car’s gearing.

RPM - for Revolutions Per Minute - were once a larger part of the motoring game, quoted from start to finish, analysed and adjusted, compared, calculated and hot-rodded.įor RPM is about the speed of an internal combustion engine, how many revolutions a minute it’s running at, how many times it fires, and pistons and shafts and belts and such spin around in 60 seconds it’s usually shown on a tachometer sitting alongside a car’s speedometer. To skite about? To ignore? Or another TV show about fast cars?

Drivers tacho symbols what does it mean