So tell me exactly how you "double clutch" and what are the benefits? is it worth double clutching when you drag someone off the lights? :?
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So tell me exactly how you "double clutch" and what are the benefits? is it worth double clutching when you drag someone off the lights? :?
When about to change gear, clutch in to neutral and let the revs rise then clutch into your next gear.. I believe it is like this..
i always thought it was down changeing?? when ur comin up to a corner i usually just put in clutch, put it in neutral then rev it a bit then put in clutch and change down the gear, i dunnno just what my old man tought me but who who knows,lol
Pretty sure its up gears. You dont need to do it if your car is relatively new anyway. Unless your synchros are about to die on ya hehe :D
"granny shifting instead of soubling clutching like you should"
its the worse line from f&f, totally BS. The quickest shift involves not clutching at all!
friends dads truck you have to double clutch when downshifting, its due to worn out synchro's on the gears. its a pain in the arse, basically pushing the cluth in twice, first time to put it into neutral then second time to select gear.
just rent the video and learn.
umm there was a thread in ff forum about it, try doing a search there :D fusion vti i think thats heel & toe :D
fusion VTi has it right...heel & toe is doing that while braking
Use it while downshifting, when upshifting do it normally, or flat shift if you hate your car or have a nice ECU that has a flatshift program :)
And thats the ONLY time you would need to use it in a veihcle where the syncros are ****ed(this includes missing a gear and having to reset it) or not even syncro gear box... if you use it any other time your an idiot and deserve to be shot!!!Quote:
riends dads truck you have to double clutch when downshifting, its due to worn out synchro's on the gears. its a pain in the arse, basically pushing the cluth in twice, first time to put it into neutral then second time to select gear.
Theres a technique that people often confuse with doubling the clutch and its called Heal and toe... its onyl really usful on a track or hard driving... ie Keeping the revs up while under BRAKES(and yes i mean foot on the brake, it shouldn't leave the brake) to do this while having your foot on the brake you clutch in, shift out of gear, Blip the throttle to keep the revs up enough for the next gear down, put it into gear and (if your good enough at it) dump the clutch(otherwise release the clutch at a quick rate). I made a post about it on MCCR... I'll find it and link it if anyone is intrested in the different braking techniques.
I said what double clutching is in another thread.....try searching
the fastest gear change would be a flat change... where ur foot never comes off the accelerator the whole quater mile! :)
heal toe not only keeps revs up
main reason for it is to control the car's weight distribution when downshifting and cornering
wouldn't want the car to suddenly jump cuos of downshifting while cornering...
Correct! Matching the revs will transfer less shock though the drivetrain making it more controlled and predictable while cornering.Quote:
Originally Posted by alan
Not to mention less wear on your synchros and gearbox :)
the order in which you move the gears is important too... Its not too great for the syncros if you put it into gear before matching the revs, doesn't take long at all to pick this technique up although most people do strugle with it in day to day driving (since it serves no purpose :P) But I have found myself using it and needing it quite a few ocasions... good thing to learn also good fun to learn.
umm...heel and toe is now doicsuesed..but i think the dude is asking about double clutching...
l'm thinking when u shift into second...and the gear is too long...u push ur cluitch in quick to rev the enging upo and then dumping the slutch again which gives u abit of wheel spin at round 5000 rpm or more
however in sayiung this..u loose abit of time..and doesn't make a difference l duin think
We already established on the other page what double the clutch was for :P
Back in the day before syncromesh... they had "crash" gearboxes... to be able to put it into the next gear the revs had to be matched. If you didn't match them you be grinding till kingdom come... Hence the reason why when you see movies with trucks, you hear them grinding the gears as they drive off. It was comon place because of the close ratios. Now days the only time you need to do it is if your gear box was ****ed and even still you wouldn't need to take your foot off the clutch, just match the revs.
So bottom line is, you don't need to do it becasue we have the luxury of synchros...(unless your synchros are gone of course)
Correct :!: :thumbsup:
It helps you shift smoother in the meanwhile. No amount of double-clutching can smoothen the shift on a really bad synchro though.
Heeltoe is for not spilling coke when downshifting
only for the maccas friday night crew.
spot on!!!.........Quote:
Originally Posted by carbine
it's up and down =o)Quote:
Originally Posted by fusion_VTi
from what you're doing, it's double clutching combined with heel-toe when you're down shifting.
keep on practising. =o) it's good.
The only time I really use double clutching is when down-shifting into first. My gearbox is a bit trempremental when it comes to getting into first gear while the car is moving, so for me it's only a necessary technique while driving in heavy traffic. Never had to use it for any other gear. However, I have heard that if you have a lightened flywheel, then you should double clutch if you are changing gears under normal driving conditions, since the revs fall quickly.
OMG, you still wouldn't need to double the clutch, only rev match.... theres a difference.if this was the case by the time you'd matched your revs and got your foot onto the clutch the revs would have droped again. The techniqure your thinking of is rev matching, which is what heel and toe is.Quote:
double clutch if you are changing gears under normal driving conditions, since the revs fall quickly.
I will concor that doubling the clutch is rev matching however, the only reason rev matching must be done is because by the time your ready to put it into gear the revs have droped below the match point, a decent trucky wouldn't even need to touch the throttle during the process.
Now that I think about it, you're absoloutely right. (My bad). It's the engine speed that falls quickly due to the lightened flywheel, not the gear box speed.Quote:
Originally Posted by SIKCVC
hehehe :P sorry for getting pissed. I've just heard the "yeah man doubling the clutch is much better" line way to many times, I just had another nuebie driver friend tell me he did it, and he thinks its better...
Doesn't matter. I soly blame F&F... before that movie it was only older drivers and truckies who even knew about it :P
are you sure? do you have proof? :PQuote:
Originally Posted by SIKCVC
ehh...i thought double clutching is for better breaking?...
why is everyone saying changing gear???
ehhh....
can people prove me that i'm wrong?????
and i thought that it's a technique to prevent your car from jamming those breaks and you can break in time to turn in the corner?
hmm...
actually, do people know wats the real reason for heel toe?...
the funny one is that...to prevent from spilling your coke!..hahaha...
hmm...i wanna know what ya guys say...hmmmm...
Heal and Toe is actually to keep your revs up as your power through a corner, theres very little need for it if your breaks are good. For example you dont want to be fumbling for the next gear after you've taken your foot off the break and want to power around, It helps with times on a track. Truckies use it because it saves the breaks and helps pull up big loads, another name is "engine brakes". which is the result... truckies arn't suposed to use them around town coz its ****ing loud.Quote:
Back in the day before syncromesh... they had "crash"(dogboxes) gearboxes... to be able to put it into the next gear the revs had to be matched. If you didn't match them you be grinding till kingdom come... Hence the reason why when you see movies with trucks, you hear them grinding the gears as they drive off. It was comon place because of the close ratios. Now days the only time you need to do it is if your gear box was ****ed and even still you wouldn't need to take your foot off the clutch, just match the revs.
i thought it was exhaust brakes they wern't supposed to use around town
everybody seems to say heel toe only keeps the power up...i wonder why...hmm....
This is some funny thread... a lot of people are misinformed, and some have the correct answers but then some people just want to continue to say what they think things are which just confuses everybody in the end.
Heel toe is not "engine brakes"...
Heel toe is a driving "technique"... a technique to "rev match"...
"Rev matching" is not a technique...
"Double clutching" is a technique...
"Double clutching" has nothing to do with "heel toe"...
Watch Best Motoring DVD's when they show the feet "techniques"... you will notice that they "heel toe" when coming up to a corner to "rev match"... but they don't do it for the sole purpose of engine braking but rather so the synchros do not get worn out...
They do it to keep the car balanced as they set up to take the corners..
Just curious, how long since you changed your tires?Quote:
Originally Posted by geo41e
watch initial d.....
i agree with dc2r
very late post!! sorry
but i thot double cluthing is only for trucks
you sir, muckafutha. Have got the right idea! it was and sometimes still needs to be used in car, but now days only with POS gearboxes on their last legs.
double post
ok everyone, from my experience of double clutching. Doubleclutching is downshitfing matching yor revs yes, proper double clutching is not easy, every car is different. You can actually make your car sound really good if you know how to doubleclutch properly, adn the faster you do it, the more impressive it sounds(i am serious)
I've had many people in my car (that know their cars), and whenever i double clutch .. they are like "WTF.. that sounds awesome.what is it?)
hehe..
after u completed a turn, ur already in your desired gear, (because you've changed at the same time u were braking for that turn.)Quote:
Originally Posted by pgclee";p="90776
Heel and toe combine double clutching + braking
Double clutching and heel and toe are good for the clutch if you do it right each time
I've had enough of this... read the rest of the posts... what your talking about is not doubling the clutch.
Doubling the clutch doesn't make ANY sound except for the sound of the fluid from the clutch cylinder being pulled through and pumped to the clutch and the clutch plate opening up. Twice.
Your talking about rev matching and yes i spose it "sounds cool" but has a bigger purpose, and this whole thing is about rev matching. But Doubling the clutch is just ONE form of rev matching.
This is the steps you follow when you double the clutch... remember its for UP-shifting...
depress the clutch.
Remove gear stick from 1st (or what ever gear)
Release the clutch.
Depress the clutch again
Match the revs
Put the gear stick into the next gear
Release the clutch.
N.B. Depressing the clutch the second time and rev matching could be the other way around.
THAT is doubling the clutch... Thats the ONLY motion for doubling the clutch (with the exception of down shifting where your shifting from higher to lower)
Thats it. Theres nothing left to explain. Anything else isn't doubling the clutch. It may be a form of rev matching, but its not ACTUAL doubling the clutch technique.
can i be the first to ask......
(yes.. im a noooob)....
whats the point of rev matching when up shifting.... wont u get more power and less time wasting if u jsut pop it into the next gear!?
never understood vin, when he said "granny shifting, not double clutching like you should be..."
SIKCVC, if u can double clutch fast, ur exhaust will make a very quick rev note, match the gears and stop .. thats the sound it will make..
in a split second.
What you just said is clearly BULLSHIT
cos WHY would u need to match the revs when you upshift, all u gotta do is wait a bit
=\
thats the most pathetic thing i've ever heard.
clearly, u THINK !you know what your talking about.
And i KNOW what i'm talking about. end of that.
Yeah coz my dads NOT a truck driver is he :| (note sarcasm)
Belive what you want. Just makes it easier for people like me to drag people like you who are sitting there depressing the clutch twice.
and WHO gave you the impressoin double clutching is for drag racing??
double clutching is for downshifting, not upshifting, so how does that give u an advantage during drag racing?
i can drive normally and beat u in a drag, if u tried double de super clutching or watever your method is.
=D
hehe
IMHO, you can double clutch UP & DOWN a shift.Quote:
Originally Posted by bumthology";p="111776
Double clutching is the act of :
clutch pedal in, put gear in neutral, clutch pedal out, [blip gas if downshifting,] clutch pedal in, select gear whether up a gear or down a gear, clutch pedal out.
NOW, whether you are shifting up or down, you are double clutching. From one gear to another you have clutched twice. The purpose to "double clutch" on upshift OR downshift is your choice or own discretion.
With modern day synchromesh, i find you only really need to double clutch if you have a worn synchro. You can use it for drag racing, you can use it at the track, you can use it doing a 3 point turn. Up to driver.
bumthology: my 3rd gear synchro is worn out. 2nd to 3rd shift catches or crunches when above 6000rpm. i find it quicker to double clutch into 3rd, rather than *wait a little bit* when shifting normally. This way, i force the synchronising, rather than wait for the synchronising.
"rev matching" is normally done on a downshift. you can rev match when double-clutching down a gear, or when normally down shifiting a gear.
"heel-toeing" is braking & rev-matching on a downshift. you can heel-toe when double-clutching down a gear, or when down shifting normally.
BUt....i could be terribly wrong :?
*ding*
thank you.
now we can stop flaming, lol.
whao this is getting hot.
but i stand by sikcvc.
like i said trucks use it cos they have lousy or worn synchros, tink another forumer mentioned that
i know cos the trucks in my country suck and in order to get a truck license i had to learn to double declutch as it is a requirement for the driving test. i dun really tink the tester wants to see how fast i can throw the truck into the corner and rev matching and stuff
this is interesting n i will share my 2cents.
Double clutching:
main thing is for cars with worn synchros, or race cars with no synchros. so unless you are planning to drive a race car, theres really no need to practise this.
Heel (not heal) n toe:
when u are approaching a corner u have to slow down right? but if u use the brakes only theres no engine braking so the car is very unstable. n when u exit the corner, your revs wld have fallen as during the corner u were on the brake or on very little gas.
so u heel n toe, that is as u approach the corner, u brake, clutch in n downshift (foot still on brake) then with the HEEL of your right foot (TOE still on brake) depress the accelerator to match the rev to the lower gear ( cos at same speed when in 4th ur rev might be 3000rpm but in 3rd its like 5000 for eg) let go of the brake while still feathering the throttle n release the clutch.
this keeps ur engine on the boil while going thru the corner. it also prevent the car jerking if u just drop gear without matching the rev as that can seriously upset your car, esp in a [acronym:b699ccc94b="Front Wheel Drive"]FWD[/acronym:b699ccc94b] thru a corner.
just my 2cents
i thot there is engine brake whenever u release the accelerator??
there is, but there is significantly less engine braking when you're in 4th gear compared to 3rd right? the key is to not float thru the corner depending only on your brakes, but let the engine share in the braking role.
I double clutch all the time. Pointless for upshifting IMO. I do it on downshifts cos my synchros are a bit worn, and it also is better for your box and synchs in the long run. Double lcutching is also good prep for heel toeing which I have nearly fully mastered now. Too many people here think all this shit is important and "I am better than you cos I can do this that rev match blah blah blah". Truth is, until you put it into practice on the track or whatever in a race against another individual, what you say on the internet means shit. So most of you guys just need to chill.
lol with javed(was gonna say at but not laughing at you :P) so true... I've been a bit of a keyboard worrier on this topic but I'm more than happy for someone to come for a spin and fault my shifting technique. Matching the revs is the most important thing to remember with any shifting reguardless what your doing, up down round and round. If you dont rev match properly it'll be rough uneven and wont do any good for your box.
/last rant ever on this topic... if anyone wants to judge my driving PM me and I'll take you up the twisties.
lol, wasnt targeted at you mate, I know im not a perfect driver (very very far from it), yet I can double clutch. However as I assume you know, it is not something worth bragging about? Everyone can appreciate a driving technique, but claiming it isnt really the way to go. And to reply to that fast and the furious quote that somebody already notably ridiculed. Who double clutches in a drag race anyways? If you are gonna use the clutch at all, you definitely wouldnt be double cluthcing on a race that contains 100 percent of shifting up. I pissed myself at that line, everybody looked at me funny. :D
ever noticed that the really good drivers in the world are very modest about it. Does that mean that the people out there that say they are good/better than you etc are actually lousy drivers.
big deal, we can all use an accelerator and brake to drive fast but what worries me is when something goes wrong.
when i was 18 i used to think i was the worlds greatest driver, i look back on it and realise that being a good driver is not about how fast you can go through a roundabout or take a corner. being a good driver is knowing your cars limits, road conditions, your own ability and driving in such a way so you wont end up crashing.
Im older now and realise when i was 18 i could have easily been another statistic cos in reality i was an unexperienced testosterone driven young driver that was a danger danger to my self and other road users.
I still would like to do some driver training one day in controlled conditions.
/rant
If you want to have a winge because people dont mind being arrogant post it in another thread. Just because a driver states that they have aquired certain skills in a certain length of time, which may be more advanced or quicker than you could have, doesn't mean they they're poor driver/havn't honed other driving skills. But if you havn't noticed the subject is actually about "track" skills NOT road driving ability.
Quote:
Originally Posted by SIKCVC";p="113664
mate i never said that any one is a poor driver, i was reflecting on my own driving abilities. i post what i like here cos im not the one whinging :lol:
hey guys
in my opinion, there are 2 ways of heel and toe
i was just wondering which one do most ppl dp
1) brake, clutch in and down shift while heel and toe-ing, clutch out
2) brake, clutch in, shift to N, clutch out, heel and toe, clutch in shift down, clutch out
no need for the second one unless your g/box is on its way out.
The first one is almost right, but after a few months of it and then you'll have to use the second one coz you'll mash your g/box.
You need to match your revs(heel/toe) before you put it into the next gear otherwise it can still grind and mash around a bit. BUT your foot only depresses the clutch once as you have noted.
Like I said unless your g/box is mashed there no need for the second one, not to mention it is extremly slow and at 120-140km entering corners you really dont want to get caught up with your downshifts. In all honesty if your gonna waste your time clutching in twice during heel and toe you might as well brake, rev match without heel/toe and brake again.
Just some notes :P but in short the first one.
so your saying
brake
clutch in
downshift but heel toe b4 u go down to the lower gear
then clutch out
to be honest
ive been using the 2nd method ever since i got my car (2 months?)
and im pretty used to the 2nd method
when i watch BMI and stuff i always notice how they only clutch once per heel toe
my friend (who taught me heel toe) said clutching twice wear out the syncrhos less
im finding it hard to change my habits and go to the 1st method
the 2nd one is just unessisary and slow, but if your 100% smooth with it, its the best for your g/box, but in comparison to single clutching your talking;
98% for single clutch
100% for doublt clutch...
If that.
If anyone has an FTP site and are willing to upload some vids, I was bored and filmed Doubling the clutch and Heel toe technique... man, first time I've bothered trying doubling the clutch... Biggest waste of time ever.
this post is so f*ckin long i have lost track
But sikcvc... i think you have missed the point... there is no point 'rev matching' if you don't double clutch... because you are only matching your flywheel speed to the diff shaft... you realise without shifting back into neutral, releasing the clutch, then blipping the accelerator, the layshaft isn't involved and it just keeps slowing down. and so yes, if the layshaft isnt involved, your gears aren't matched to your wheel speed when you shift in.
If you do what you're doing then you might as well just apply more accelerator as you release the clutch, it's the same.
and if you think you can just rely on your synchros, think again... why do some cars have triple synchro cones? because the single synchro cones in our cars aren't designed for the beating they can get at race speeds. thats why you want to match revs using heel toe + double clutch. And it's not too hard. Like anything, it needs work but its doable.
And if you guys don't know what i'm talking about, plz do your reading before you reply
http://auto.howstuffworks.com/transmission3.htm
...blah.
To add finally...ive spent most my legal driving life driving small trucks and vans etc for my old mans company - and due to experience - double clutching becomes second nature.....basically...because to slow down a 15 ton vehicle you must use the gears and not the brakes :)
oh....having size 13 shoes , and very long toes really does help too :)
Have you ever tried this?? do you want to lose control of your car? How can you brake, then let go of the brake, and then brake again while cornering? you will fly off the road!!Quote:
Originally Posted by SIKCVC
if you do this, you will firstly shift your centre of gravity towards the outer front wheel. then when you release the traction from this wheel will decrease and the car's centre of gravity will be moving backwards towards the inner rear wheel. if you brake again during this time while still cornering your car will lack centripetal force, and you will shoot out on a tangent.
the key to grip is to never set up a pendulum effect in your car's centre of gravity!
They clutch twiceQuote:
Originally Posted by gelo
There's no point clutching once, you don't do anything by dry revving your flywheel! you don't match the next gear to the shaft as the gearbox is TOTALLY disconnected from the engine!! the clutch is before the gearbox!!
well
perosnalyl i used clutch twice in my heel and toe's
ive been watching the BMI abd option videos lookign just at the foot camera
and it seems as tho they only clutch one per heel-n-toe downshift
now me and my friend reckons they make depress the clutch fully and ease off it past friction point then rev match and depress the clutch fully again
i swear it looks as if they only clutch once
My point was that its slow either way... of cource I'm not fcuking stupid enough to do anything as retarded as that!!! I didn't say brake while cornering!!! read it again.Quote:
Originally Posted by viperx
They would only clutch in once... Unlike us they're not stressed about gear box longevity, they're only worried about times.Quote:
well
perosnalyl i used clutch twice in my heel and toe's
ive been watching the BMI abd option videos lookign just at the foot camera
and it seems as tho they only clutch one per heel-n-toe downshift
now me and my friend reckons they make depress the clutch fully and ease off it past friction point then rev match and depress the clutch fully again
i swear it looks as if they only clutch once
For one thing, its not slow to heel-toe and double clutch provided you have had enough preparation going into the corner. If your foot is on the brake when approaching the next bend then why is it slower if you can fit the double clutch in at that time? And yes it is not too hard to fit double clutching in. Nobody told you to blunder into corners unprepared. Its a skill that needs to be practiced. And my point isn't even braking while cornering. Its the fact that you can't take your foot off the brake, go and do something and then brake again while applying a lateral force. You will upset the car's balance and in high speed situations, lose traction (ie. lost time), potentially even roll the car.Quote:
Originally Posted by SIKCVC
And secondly, they are worried about gear box longevity. You realise that in BMI a lot of the time they are not driving dog boxes. They are road cars being subjected to race conditions. If they weren't worried about longevity, don't you think they would be flat changing on the upshift all the time? Why clutch at all?
Thirdly, if they really are clutching in once, then they do not need to blip the throttle WHICH THEY DO. I thought I had established that blipping the throttle without releasing the clutch DOES NOTHING except waste a bit of gas. It DOES NOT match your gear speeds because the layshaft is not connected when you blip the throttle. Please do your theory...
Driving with mechanical sympathy is a skill. Driving fast is also a skill. That is why driving fast AND being mechanically sympathetic is hard.
haven't read the whole thread...but wouldn't blipping the throttle keep the revs up besides wasting gas? :rolleyes:Quote:
Originally Posted by viperx
It only keeps the revs up in everything up to the flywheel. So it's pretty much useless.... if you don't release the clutch, then blip, then clutch again, then your gearbox slows down.
Do you guys that heal-n-toe have aftermarket pedals? I find it pretty hard to do in my car (throttle in particular), but in my mate's BMW the pedals seem to be in a much nicer position. It would be a great technique to learn for those track days.
Cheers,
Tim
Quote:
heel-toe is used to avoid abrubt weight transfer. If smoother shifts are what you're after, then double-clutching is the answer: put it in neutral then let the clutch pedal out (flywheel is now connected to the layshaft but not to the differential because it's in neutral) then give it gas until the layshaft is spinning at the correct speed for the lower gear, then QUICKLY push in the clutch, shift to the lower gear and release the clutch, all before the revs decrease. In most racing today, double-clutching is not used because syncros make it unneccessary and it would only increase shift times, but some people still like to practice it--mostly so they can add another driving skill to their repertoire.
You've obviously never heard of compression lock, which is a far bigger issue to a race company with $$$ to spare but not seconds. Without increasing engine revs to match road revs you will get compression lock at high RPM...Quote:
Thirdly, if they really are clutching in once, then they do not need to blip the throttle WHICH THEY DO. I thought I had established that blipping the throttle without releasing the clutch DOES NOTHING except waste a bit of gas. It DOES NOT match your gear speeds because the layshaft is not connected when you blip the throttle. Please do your theory...
Theres more than mechanics involved...
You've established nothing except for the fact that syncros will slowly die if you dont double the clutch. and Flat shifting is far more damaging to engine parts especially considering the engines are under considerable load on accell compared with decel.
Tractions not the issue here, if you attempt this at the same distance you would heel and toe your gonna end up off the track because you'll enter the corner too hot. Thats the biggest issue.Quote:
Its the fact that you can't take your foot off the brake, go and do something and then brake again while applying a lateral force. You will upset the car's balance and in high speed situations, lose traction (ie. lost time), potentially even roll the car.
Heres a quick experiment... try and make your mouse tip onto its side by only applying sidewards force... its not gonna happen... center of gravity is too low. The arab drifters are the best way of seeing this in action (130-140km then full lock steering wheel in stock camry's, they spin about 4-5 times) The only thing that will change this is if you apply a strong enough force apposing the CofG at a lower point, ie hit a gutter.
I've mentioned flat shifting... and in a lot of cases race drivers WONT clutch in on upshifts. They're skilled enough not to. I recomend anyone who has the balls/knowledge of their car to try it... its a peice of piss. Granted I'd never try it at high revs but it can be done.Quote:
If they weren't worried about longevity, don't you think they would be flat changing on the upshift all the time? Why clutch at all?
Just as a side note its only really FWD that you cant left foot brake in... its a commonly used technique in RWD's. That is where you balance a car around a corner with both throttle and brake.Quote:
And my point isn't even braking while cornering.
sorry for the essay... a lot to reply to.
Edit: What Fuel tank Quoted is spot on.
I read nearly eveything in this thread but I couldn't find anything about clutch ware....
The way i was informed (which could definatly be wrong so bear with me :P)
Rev Matching is the best way to preserve ur clutch, letting the flywheel and clutch spin at the same time causing the least amount of friction?
Similarly with Heal Toeing, I have a friend that heal toes every gear down ... Its a smoother ride.. i can vouch for that, but he also claims the clutch life story...
Is this true?
its more for racing to prevent compression lock and to set the car up in a balanced power possition around a corner... as viperx has pointed out, its not great for your syncros so not something you should be doing all the time. unless your super fast and smooth at doubling the clutch during heal and toe.
Its an old line but it hasn't been mentioned.
Gears are for going, brakes are for stopping.