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View Full Version : MTX bad downshifting habbit ?



Psy-q
08-18-2011, 01:32 AM
Hey guys. Just wanted to ask a few manual transmission gurus around here if what I am doing is bad.

Im 21 now I've been driving manual since 16. Im pretty good at downshifting, whether heel-toe or just to overtake.

I know to properly downshift from say 4th to 3rd one must release gas, depress clutch, give it a little gas to rev-match while holding in clutch and shifting into 3rd, then release clutch and back on gas. I can do that no problem but I've always found myself doing it with a little short-cut.

If Im cruising at, say, 1/5 throttle in 4th gear at 60 KPH and suddenly I need to be in 3rd gear (yellow light, overtaking, etc) all the proper procedures take too long, especially if I am not anticipating a downshift.
So what I do to really quickly downshift is this:
- NOT realease gas
- QUICKLY depress clutch, shift into 3rd and release clutch, All that while still 1/5, 1/4 throttle.
That split second while clutch is disengaged the motor revs up a little and 99% of the time it is just perfectly enough revs to downshift. At any speed above 50 KPH this technique worked flawlessly for me in both of my cars.

I was wondering if there is any additional wear on clutch, synchros, tranny, etc. if I downshift my "shortcut" way.

Looking forward to opinions!

tweak_s
08-18-2011, 02:02 AM
I'd say a bit of additional wear for sure on the clutch (not sure on synchros or tranny). And if I'm wrong feel free to correct me someone.

The reason why I think this is because even though you're still "matching" as you release the clutch, that split second as you're disengaging the clutch you're still giving it gas so you're clutch is taking that extra spin until its fully disengaged.

You're essentially shifting with no lift.

Pillbox2010
08-18-2011, 10:14 PM
Its called powershifting and it is quite common.

http://en.wikipedia.org/wiki/Powershifting

It does increase wear on the clutch and transmission, but is sometimes necessary.

Default User
08-18-2011, 10:25 PM
Maybe just me - but it doesn't take any time at all to lift my foot off the accelerator pedal while I hit the clutch

G-daddy
08-18-2011, 11:33 PM
Hmmmm...I always powershift from 1st to 2nd, that is the only way I can do it smooth. It's weird, still can't shift smoothly from 1st to 2nd properly. LOL