Double clutching and heel-toe?

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Originally Posted by .:Thrasher:.

LOL

shit man, now me and the mad scientist have to rip apart the block, and replace the....(wait for it).....PISTON RINGS YOU FRIED!

can double clutching be bad for your car?

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IF you do it correctly no.
If you do it incorrectly yes.

Same issue as quick shifting.
Doing it properly its awesome as you can go from first to second (whichever gear doesnt matter) in the matter of a second not even..
IF not done properly you run the risk of scratching your gear box n mis-shifting

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Originally Posted by lithium

yes and please note:

1) double clutching is not used at any stage while drag racing
2) double clutching is unnecessary in a gearbox with synchros, which includes all modern passenger cars. it's an archaic technique carried over from when gearboxes had no synchros and only used nowadays when downshifting in a heavy vehicle, or a race car with a dog box, or perhaps if your gearbox is shagged
3) rev-matching and heel-toe are still useful and should be learnt
4) do not learn about cars from the fast and the furious
5) please refer to 4) :)

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Not true - it saves your synchros

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Originally Posted by Mr_will

Not true - it saves your synchros

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i maintain double clutching is UNNECESSARY in a modern gearbox with functioning synchros.

why anyone still double clutches on a gearbox with synchros is beyond me. i only ever use it to get into first while moving as mentioned above by Aaron. i suppose you also don't use your brakes because you'll wear out the brake pads? ;)

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Originally Posted by davidha91

I thought double clutching was used during drags? But what's the point of double clutching when you can just brake, then downshift?

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double clutching is only used on downshifts, therefore it is never used in drags

rev-matching is used to smooth a downshift. this is important when you are cornering at the limit, and any jolt in the drivetrain will fling you off the road.

double clutching is rev-matching while clutching out as the shifter passes through neutral. it matches gear speeds inside your gearbox. the main difference you will feel is that the shifter will slide with minimal effort into the lower gear.

the drive-train smoothness of a double clutched downshift will be exactly the same as a correctly rev-matched downshift. therefore double clutching is usually not used in modern passenger cars.

heel-toe is used to rev matching while braking

i hope this all makes sense :)

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Originally Posted by lithium

i maintain double clutching is UNNECESSARY in a modern gearbox with functioning synchros.

why anyone still double clutches on a gearbox with synchros is beyond me. i only ever use it to get into first while moving as mentioned above by Aaron. i suppose you also don't use your brakes because you'll wear out the brake pads? ;)

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correct me if i'm wrong, but aren't synchros one of the first things that go in a gearbox that hasnt been thrashed? wouldnt that mean double clutching would save you a bit in the long run?

I thought if a gearbox has never been thrashed the first thing to go would be the clutch? Like lithium said double clutching is unnecessary with cars that have synchros but they do have benefits like saving your synchros. I think with modern cars double clutch is almost pointless I'd say single clutch revmatches are enough.

It's an invaluable tool to have up your sleeve - It's great to know that you'll always have the right gear without the risk of flying through your windscreen, heh.

So what about if you are going lets say 60kms on gear 4 and you are dragging then you downshift to 2 for higher speeds. Is double clutching required?

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Originally Posted by davidha91

So what about if you are going lets say 60kms on gear 4 and you are dragging then you downshift to 2 for higher speeds. Is double clutching required?

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Why would you be shifting down to 2nd for higher speeds?

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Originally Posted by braeden

Why would you be shifting down to 2nd for higher speeds?

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well i'm driving at 60kms on fourth gear and if i downshift to second gear, vtec would kicked him much quicker.

He probably means to downshift to be in the power band. Anyway if you want to downshift double clutch is still not required, like i said before just do single clutch revmatch, meaning blip the throttle before u release clutch and the gear change should be smooth

if you blip before you release the clutch.. your burning (or wateva its called i forgot) the clutch aren't you?

well what I do is use double clutching to downshift on straights when i need to accelerate like overtake or something and heel-toe for corners and sometimes coming to a stop.