Heel / Toe / Double De-Clutch Shifting

My attempt at it inside a Clio 172 Cup

Category:

Autos & Vehicles

Tags:

• renault
• clio
• Sport
• 172
• cup
• heel
• toe
• heeltoe
• double
• de
• clutch
• declutch
• downshift
• shift
• shifting
• gear
• change
• downchange

[125zetecs]

why are you double de clutching when your gearbox has syncro? your gearbox is already syncronized. i've never seen HT and Double Clutching used together before.

[MarkCup70]

I know it has a syncromesh...it's a driving technique I thought I'd have a go at.

Also, to double de-clutch you have to rev the engine with the clutch up in neutral, so you naturally have to heel/toe if you're on the brakes when you do it.

I'm not sure how it would be possible to do it without heel and toeing when you're on the brakes?

[MarkCup70]

It's not about the engine. Double de-clutching helps the gears engage.

Yes, modern 'boxes have a synchro, but when I do this, the gears always engage easier, more smoothly.

[MarkCup70]

Heel and toe helps the clutch and car balance.

Double de-clutching can help the gearbox along too.

[interpret4u]

This video shows the proper technique to dbl-clutch a downshift.

Reving an engine while in "Neutral" gear, w/clutch pedal released, is the only time transmission gears can be matched with engine rpm.

Other videos reving while clutch is depressed are wrong and damaging.(idiot in Lotus)

Any time the clutch pedal is depressed, the engine is seperated from the transmission. Reving will only spin the engine. Choritsu-shi NomuraTuning&Design

[man3ack]

whats actually happening, i do this at traffic lights because my feet are too big and fit across both pedals.

surly it takes longer to press the cluth twice than once and lash it in gear with a bit of force?

[MrHellyeah2010]

I'm surprised they don't teach this in driving schools anymore :/

It's a very handy procedure even in normal driving sometimes. It's funny hearing someone driving up a hill in a car with a big load and running out of puff. Then they make a rough downchange to get back in the torque curve but the car still struggles a bit. Double de clutch it!

It's handy too when you need to overtake someone quickly on the highway, without a really brutal, sudden jump in revs.

Good ole double de clutch

[Ebiiichu]

1:03 isnt that a toe-toe version? =)

[Polishsebbe]

Nice driving mate! Makes me remeber when i was learning dcht when i was 18 yr old in my toyota corolla 92, sweet times on the roads in stockholm. Don't have a car right now, i'm studying so I have to watch these videos instead :P I will put up a video of me doing this if i get the chance though :)

[hasido16]

this is hard if you have no coordination. Once you learn it, downshifts can be performed earlier and smoother for sure. i can do it ,just not as fast as porfessional race car drivers.

[stevenscottoddballz]

What are the dis/advantages of double de-clutching?

[Losna61]

@interpret4u Another way to put it: simple heel and toe is required to prevent wheel locking, partially minimizing engine's inertia on the transmission. Dbl-declucth is even better, as it minimizes TOTALLY ALL the inertias, including half of the gear inertia, left out with simple H&T. But I'm willing to admit that some heavy bulky gears coupled with very torquey big engines may benefit a lot from dbl-declutch (trucks and dangerous rectiles like Cobras and Vipers ;D)

[Losna61]

@Losna61 >>> More: engine's inertia and wheels+diff+transmission shaft inertia are much greater than "half gears" inertia. When downshifting under severe braking, the main problem is not "keeping the gears/syncros happy"but "avoiding rear wheels lock". Which can be obtained by "simple" heel and toe. One more thing: the above is not referred to dog-gears, which require dbl-declutch. By the way, i appreciate dbl-dec downshifting, I often do it.

[Losna61]

@interpret4u I see your point and you're right when you say that without dbl-declutch trans revs don't match engine revs, but don't forget that, INSIDE the gear, you have one shaft that revs with the engine, and ONE that revs with the wheels. So you have approx only "HALF of gears" that "depend on the engine". >>>

[interpret4u]

@Losna61 You and the racers are wrong. There's no such thing as, simple heel&toe downshifting. You may think that it works, but it's IMPOSSIBLE to match rev any engine and transmission while the clutch pedal is pushed down... they're both separated.

heel&toe is double clutching a downshift while braking. This allows for a smooth engagement and not to upset the balance of a car while entering a turn. This technique applies to syncronized and non-syncronized transmissions.

[interpret4u]

@Losna61 You and the racers are wrong. There's no such thing as, simple heel&toe downshifting. You may think that it works, but it's IMPOSSIBLE to match rev any engine and transmission while the clutch pedal is pushed down... they're both separated.

heel&toe is double clutching a downshift while braking. This allows for a smooth engagement and not to upset the balance of a car while entering a turn. This technique applies to syncronized and non-syncronized transmissions.