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-   -   Shifting (http://www.bimmerfest.com/forums/showthread.php?t=658607)

lgr122 11-16-2012 04:00 PM

Shifting
 
How do you actually do it?
I mean... i've heard lots about double clutching, but i never actually did myself.
For me there are two ways, slowly clutch and accelerator combined, passenger won't feel anything... or maximum attack, as fast as possible clutch and accelerator combined, gear sharp right moment, and just going...

How do you do it?

KenG 11-16-2012 04:24 PM

It's like masterbation
Some like it slow
Others like it fast
As long as I don't get a cramp in my hand or wrist, then we're good

Sent from the middle of nowhere

mrg325i 11-16-2012 04:26 PM

Back before synchronizers, you would push in the clutch and take the car out of gear and release the clutch. You would depress the clutch again to put the car into the next gear. Meaning that you would press and release the clutch twice to shift from one gear to the next (old Ford and International pickups).
Thankfully, we do not have to do this anymore. Nice way to build up the muscles in the left leg.

mrg325i 11-16-2012 04:33 PM

There are several good tutorials on youtube.

Fast Bob 11-16-2012 04:34 PM

Double-clutching is a technique that was developed way back in the infancy of motoring, when manual transmissions had no synchromesh, and it was only driver skill that prevented turning a gearbox into a can of scrap metal.

Nowadays, double-clutching is still a useful skill to master for downshifting, as it removes almost all stress from the synchros, allowing a lower gear to be selected with the shifter gliding through the gate "like butter", with no resistance.

The cadence would be as follows for a "four-to-two" downshift:

While cruising in 4th, push the clutch in, moving the shifter to neutral....
Then, let the clutch out, and blip the throttle to raise the RPMs....
On the downrev, stab the clutch again, while moving the shifter *quickly* to 2nd gear.

If performed correctly, you will be amazed at how smoothly and effortlessly it went.

lgr122 11-16-2012 04:59 PM

Thank you mates. :)

I drove tractors and bulldozers and cars with very small engine, but i never needed double clutch for anything.

My technique is to be very quick.
When clutch foot is going down at the same time accelerator pedal is coming up and hand goes from one gear to another. Clutch and accelerator feet kind of meet in the middle, there is 0,1s when clutch is completely down and accelerator completely up and that's when gear change happens. Left hand is holding steering wheel when feet and right hand do the trick.

I drove tractor on farm since i was 12yrs old, and never with automatic transmission in anything, but i never actually got that double cluthing...

TannerT 11-16-2012 08:57 PM

Love driving the formula car clutch! Ha! Letting down to 8grand and pulling the shifter back is all it takes. Double clutching was covered pretty well so I will only say that it is not strictly necessary but very useful.

Sent from my PantechP9060 using Bimmer App


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