ALRIGHT im so sick of everyone giveing me all these different answers on what double clutch is i've been told its when you downshift and u shift down 2 gears, then i've been told its when u pump in the clutch twice and then put it in gear or its where u not use the clutch at all......i get all these different answers from stupid lil ricer ppl...... WELL what is it?
1) car in gear
2) clutch in
3) gear out
4) clutch out
5) clutch in
6) gear in
7) clutch out
the idea is to leave the car in neutral for a split second versus having the clutch in all the way and going into gear directly.
so its gear - neutral - gear, vs gear to gear.
in this way, during the neutral stage you can rev match so that the gears align perfectly (driveshaft speed to the engine speed) and you have a smooth shift.
Lets say your downshifting from 4th. You put it into neutral then clutch out then rev match then clutch in again to put it into 3rd then clutch out to engage gear. Basic gist of it. Theres a lotta articles online you can read through
Lets say your downshifting from 4th. You put it into neutral then clutch out then rev match then clutch in again to put it into 3rd then clutch out to engage gear. Basic gist of it. Theres a lotta articles online you can read through
You really never need to do this on your car though... or any car that has synchros. This is a technique used by big diesels and 18 wheelers and such... it is of pretty much NO use to you, whatsoever. Especially not in racing.
You really never need to do this on your car though... or any car that has synchros. This is a technique used by big diesels and 18 wheelers and such... it is of pretty much NO use to you, whatsoever. Especially not in racing.
who cares... just drive the car however u feel like... my 2003 coup 6spd has 82k on it as of today and i give the car a beating all the time... clutch is still fine and tranny is doing very well...
who cares... just drive the car however u feel like... my 2003 coup 6spd has 82k on it as of today and i give the car a beating all the time... clutch is still fine and tranny is doing very well...
ok. but some people want to see their car last longer. btw do you downshift? do you use your brakes for anything OTHER than traffic stops (red lights, traffic, toll booths, stop signs?)
i dont. i downshift by rev matching. ppl wave at me crazy saying your brake lights are out.
ok. but some people want to see their car last longer. btw do you downshift? do you use your brakes for anything OTHER than traffic stops (red lights, traffic, toll booths, stop signs?)
i dont. i downshift by rev matching. ppl wave at me crazy saying your brake lights are out.
well yes i rev match.. i downshift like a mofo... i double clutch sometimes but i'm saying double clutching is not really necessary. rev match and your fine.
ok. but some people want to see their car last longer. btw do you downshift? do you use your brakes for anything OTHER than traffic stops (red lights, traffic, toll booths, stop signs?)
i dont. i downshift by rev matching. ppl wave at me crazy saying your brake lights are out.
First of all, riding the engine down to a stop might not be great for longevity. Brakes are cheaper to replace than a drivetrain. Also, heel/toe downshifting is like double clutching, but cooler.
First of all, riding the engine down to a stop might not be great for longevity. Brakes are cheaper to replace than a drivetrain. Also, heel/toe downshifting is like double clutching, but cooler.
FSAE. But, we're using a motorcycle engine, so it's sequential. As for downshifts, we're going to buy a slipper clutch, which will allow us to downshift without blipping the throttle (we would blip, but the rules make it exceedingly difficult to).
FSAE. But, we're using a motorcycle engine, so it's sequential. As for downshifts, we're going to buy a slipper clutch, which will allow us to downshift without blipping the throttle (we would blip, but the rules make it exceedingly difficult to).
they're built for a motorcycle, which doesn't last very long in the first place. And we're going to be putting it under lots of stress, so not particularly long.
heel-toe downshifting is comparable in effect to double clutching for downshifting.
double clutching for an upshift is NOT necessary on a synchro-mesh transmission, but it is true that it will prolong the life of your clutch and synchros. there are trade-offs to double-clutching or not, and its just a matter of where you place your values. google this for more info
You really never need to do this on your car though... or any car that has synchros. This is a technique used by big diesels and 18 wheelers and such... it is of pretty much NO use to you, whatsoever. Especially not in racing.
Double-Clutching
Truck transmissions don't have synchromesh gears which allow you to shift even if the input and output shafts are rotating at a different speed. For a truck, you need to match speed with what the engine and wheels are doing. Shifting for truckers is a two-step process. Hit the clutch and put the transmission in neutral. You then quickly tap the accelerator to match engine revs with what the wheels are doing, hit the clutch and put it in gear. You can use this method to see how smoothly you are shifting normally, and helps you learn how to rev match. The benefits of rev matching include smoother transitions between gears, especially on downshifts as well as reducing the wear and tear on the synchromesh gears themselves.
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