The complete automotive resource for buyers, sellers, and owners like you.
Car, Truck and SUV Forums at Roadfly
+ Bentley Forums
+ BMW Forums
+ Cadillac Forums
+ Chevrolet Forums
+ Ferrari Forums
+ Jaguar Forums
+ Lamborghini Forums
+ Lotus Forums
+ Mercedes-Benz Forums
+ Maserati Forums
+ MINI Forums
+ Porsche Forums
+ General Discussion
+ Marketplace Forums
Re: what are the basic procedures for this? (archive)
[ Follow Ups ] [ M5 (E28) Message Board ] [ Msg. Board FAQ ]
Posted by Steve Offley on March 20, 2002 at 17:33:18:

In Reply to: Re: what are the basic procedures for this? posted by matt evans on March 20, 2002 at 14:36:01:

Why bother on upshifts? Well, maybe only if the synchro is tired or the 'box is obstructive (as was my dog-leg M535i, see above), in which case it will give a smoother shift. My M535 was so b***dy awkward sometimes when cold, it was often easier to shift from 1st direct to 3rd. This baulkiness would improve rapidly as the 'box warmed up - if left idling from cold (nasty!), the radiated heat from the exhaust would soon smooth things out. And before you ask, yes, it *did* have the correct lubricant in it!

If the rear wheels lock on shifting downwards -whether double-declutching or not, then I suggest the throttle blip has been made too early (allowing rpm to fall too far) or the revs weren't high enough in the first place: the drivetrain is having to overcome the inertia of a slow-moving engine.

As for the speed of a double-declutched change - as they say, practice makes perfect!

I learned many years ago (when E12's were all the rage and the M-concept was just a twinkle in someone's eye...) on a double-decker (London-style) bus with no synchromesh on 1st and 2nd (ever) - if you didn't double-declutch, you didn't get as far as finding a gear that was synchronised! Part of the driving test was a hill start: 2nd was too high for starting on a hill and if you let the revs drop 2nd would not engage and you would roll to a halt...failed. So it was a case of having to learn to double declutch quickly, using a pedal with a return spring of sufficient strength to overcome the effect of a lazy driver riding the pedal - as well as a gear lever 3 feet long. Great fun...

My employer has a 1923 Vauxhall 14/40 - that has three speeds and, of course, no synchro (gate change, too!). See - I knew double declutching would be handy one day!

Enough rambling through history for now (anyway, Henry Ford said it was bunk, didn't he?!).

Regards

Steve

Regards

Steve

Follow Ups:


[ Follow Ups ] [ M5 (E28) Message Board ] [ Msg. Board FAQ ]
Questions, comments, or problems, please visit the Roadfly help desk.
Roadfly.com Logo © 1997 - 2009 Jump Internet Inc. All rights reserved.