Before the introduction of transmission synchronizers (in the 1920s) and helical cut gears, double clutching was a technique required to prevent damage to an automobile's gear system. Due to the difficulty involved in learning the technique, and because of the advent of synchronized gearing systems, it has largely fallen into disuse. However, drivers of large trucks still use the double clutching technique, as those vehicles are usually equipped with older, more efficient and more durable, unsynchronized gearboxes.

The purpose of the double-clutch technique is to match the rotational speed of the input shaft being driven by the engine to the rotational speed of the gear you wish to select (directly connected to rotating wheels). Once the speeds are matched, the gear will engage smoothly. If the speeds are not matched, the dog teeth on the collar will "crash" or grate as they attempt to fit into the holes on the desired gear. A modern synchromesh gearbox accomplishes this synchronization automatically.

Yes deffinatley a racing situation however there are many more variables on the road than in a race situation, Track days there a very few Comparatively.

Road, circut, or racetrack I always drive the car with the same technique (not speed or aggresiveness).

But meh each to their own.

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500+hp and helis on tap, eta - June 2025.

I normally always double clutch, and when it calls for it heel toe, as it does make changes down smoother, keep a more balanced car, means i can go into first at up to about 50 km/hr smoothly and without any gear damage . When coming into a high speed corner, i usually will stay in what ever gear im in untill i reach my corner speed then change down to what ever gear is appropriate.

On the street i always try to practice it, though obviously without speeding, just driving normally. I dont bother double clutching on upshifts. just let it fall in, and do the clutch as quick as possible, sometimes without

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Version 6 STI

I use to double clutch in the holinger (non synchro/dogbox) when in street duties, altho, once competent with the gearset it was very possible to 'time' the shifts and allow for the rev speed to match the gear speed on up and down shift, further enhancement of the technique required no clutch at all cept for stationary approach and departure.

Normal synchro box, rev match and heel toe all the time, very efficient form of driving, less stress on the box and driveline, but isnt so flash for fuel economy

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www.racewars.com.au

Never driven a car with a dog box, yet. However I have driven a Centurion tank, that had what they called a "crash box" esentially a dox box just everything was way bigger and had more resistance. Had to double clutch on down shifts and double clutch and pull one of the steering levers on the upshift, very hard to get it right.

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500+hp and helis on tap, eta - June 2025.

You win . I find myself heel-toeing all the time too, just makes it easier for the gears to go in.

I always heel-toe/rev-match nowdays, practice makes perfect

It makes for a smoother drive so why not.

It was deffinatley the best fun I've ever had under 60Km/h (and possibly over ) all 52 tonnes of it!!!!

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500+hp and helis on tap, eta - June 2025.

I cant heel and toe. My knee hits the steering wheel. Damn being tall! But I can still rev match

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RS Liberty - Because WRX's are only good for parts...

Tried heel toeing but tend to press the brake too hard when trying to get my heel to tap the throttle, resulting in my car throwing me forward.
I just give it a little rev when i got the clutch depressed on downshifting to match the revs, seems to make gearchanging more smooth.

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"Wrong fitment".