GTR Gearbox Poll - Page 6 - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

brianbunning · 17th March 2007, 12:15 AM

have a slight crunch when changing at high reve from 4th to 5th but nowt major, gonna try some heavy shockproof oil, how much will i need?

Bucky · 22nd March 2007, 08:44 AM

Quote:

Originally Posted by gavman

to correctly heel'n'toe you must double declutch

when you blip the throttle you should be in neutral, clutch released

You must have some long and weird shapped feet to be able to blip the throttle whilst the same foot is on the clutch pedal.

nozza1 · 4th April 2007, 04:54 AM

Owned my r43 gtr vspec for about a year now and lm really unhappy with the gearbox. Its fine when cold but when it heats up it has a progressive whining noise and keeps on jumping out of second. Didnt crunch in the beginning but has now a few times. Want to rebuld the box but nobody wants t touch it locally. Managed to find a company in milton keynes known as compotition transmissions, web sight Gearboxman - home. he has said he can do it but he might have to source the parts from other gearboxes. ( nissan do not provide parts for gearbox) Im abit unsure and was wondering if anyone has had the same problems with the 6 speed getrag and has anyone heard of the gearboxman. please could somone advise and point me in the right direction. thanxs

Floyd · 4th April 2007, 08:56 AM

I remember reading somewhere that the Toyota 6speed R160 getrag box is the same as the R34 getrag, perhaps there's someone who can confirm this, or tell me I'm wrong?

gavman · 4th April 2007, 02:15 PM

Quote:

Originally Posted by icydude

there is no point being in neutral to double clutch

????????

you have to be in neutral to be able to take your foot off the clutch
you have to take your foot off the clutch WHILST blipping the throttle, in order to match transmission speed to the gear you are about to drop into

to explain:
in fourth gear, approaching third gear corner
begin braking (right foot)
clutch in (left foot), select neutral, still braking (right foot)
release clutch (left foot), transmission now in neutral, still braking (right foot)
now continue braking with inside of right foot and blip the throttle with the outside of the same foot (heel'n'toeing)
clutch in (left), into gear, release clutch as revs match road speed (still braking)
release brakes, turn in

gav

GTR RGT · 26th July 2007, 05:45 PM

What weight (w) is Redlines heavy shockproof?

And am I right in saying I need 4.1 litres to feel my gear box?

1st and second hate me

myline · 26th July 2007, 06:04 PM

Go to Turbobits for best prices on Redline

ru' · 10th August 2007, 08:54 PM

Quote:

Originally Posted by gavman

to correctly heel'n'toe you must double declutch
...

Surely to double declutch you must double declutch.

Heel and toe-ing is (imho) different; blipping the throttle on down changes to make it smoother etc. and doesn't require double declutching. Of course you can (do) blip the throttle when double declutching.

Does that make any sense?

Bucky · 11th August 2007, 08:12 AM

Why the **** do you want to double de-clutch a box with syncro's??

Do you's know what yous are talking about?? You only double de-clutch a crash box or a very ****ed standard box.

ru' · 11th August 2007, 09:21 AM

I've never DDC (life's too short), but I often H&T. Having said that I've never driven a car without synchros.

gavman · 12th August 2007, 04:53 PM

Quote:

Originally Posted by ru'

Surely to double declutch you must double declutch.

Heel and toe-ing is (imho) different; blipping the throttle on down changes to make it smoother etc. and doesn't require double declutching. Of course you can (do) blip the throttle when double declutching.

Does that make any sense?

i was taught (incorrectly) that i needn't double declutch when heel'n'toeing
first time i had circuit instruction the instructor kept peering over to see what my left foot (wasn't) doing as i blipped the throttle while on the brakes

it's not just the engine, but the entire drivetrain needs to be synchronised
try dropping down to first gear without doing it!

it is one of those 'masonic handshake' driving techniques that will always give you an advantage over someone not doing it
it just keeps the car smooth whilst braking, and then helps you make a smooth, clean transition to full throttle, without the car dancing about, and means the engine is on cam ready to pull you through the corner

in a nutshell, it makes you quicker
that's why in-car footage of rally drivers often shows their feet dancing across all three pedals

rockabilly · 14th August 2007, 07:48 PM

very true gavman. too give you guys an idea of how effective double declutch is, for example if you wanted it would be possible to be doing 80 mph in 4th and by the above method and a very heavy rev in between you could select 2nd with no crunching whatsoever. now i know the box would blow up if you let the clutch out, but if you tried the same thing but this time just pressed the clutch once and then tried to select 2nd you would hear the most almighty grinding noise ever. thats the principle reason for the above. you bring the next gear down upto the correct revs so that when you release the clutch the revs are already at the right speed..bernie

M SKinner · 14th August 2007, 07:50 PM

Quote:

Originally Posted by Bucky

Why the **** do you want to double de-clutch a box with syncro's??

Do you's know what yous are talking about?? You only double de-clutch a crash box or a very ****ed standard box.

Some people dont like wearing their synchros out, and like a faster gearchange

TidyTobes · 19th August 2007, 07:34 PM

Just 3rd to 4th on mine, will get round to it some time??

GT-R Glenn · 27th September 2007, 11:41 PM

OS Giken 1st to 5th
Love it.
I will most likely change my diffs to gts4's.

View Poll Results: GTR Gearboxes....
Stock box fine and serves its purpose well, no problems yet thanks..	149	43.19%
Stock box was fine but now causing some concern whilst changing..	80	23.19%
Stock box doing my head in now and needs changed asap!	10	2.90%
Stock box let me down and now on 2nd.. 3rd... 4th...replacement..	21	6.09%
Rebuilt stock box and very happy now thanks!	18	5.22%
Killed rebuilt box and need a really expensive one.. HKS..O/S..	9	2.61%
I have a really expensive box.. and am a smug b**tard thanks ;-))	37	10.72%
None of the above	25	7.25%
Multiple Choice Poll. Voters: 345. You may not vote on this poll

4th April 2007, 04:54 AM	#78 (permalink)
nozza1 GTROC Member Join Date: Jan 2007 Posts: 702	6 speed getrag Owned my r43 gtr vspec for about a year now and lm really unhappy with the gearbox. Its fine when cold but when it heats up it has a progressive whining noise and keeps on jumping out of second. Didnt crunch in the beginning but has now a few times. Want to rebuld the box but nobody wants t touch it locally. Managed to find a company in milton keynes known as compotition transmissions, web sight Gearboxman - home. he has said he can do it but he might have to source the parts from other gearboxes. ( nissan do not provide parts for gearbox) Im abit unsure and was wondering if anyone has had the same problems with the 6 speed getrag and has anyone heard of the gearboxman. please could somone advise and point me in the right direction. thanxs

14th August 2007, 07:48 PM	#87 (permalink)
rockabilly rb30 710bhp Join Date: Oct 2003 Location: lancashire Posts: 1,049	very true gavman. too give you guys an idea of how effective double declutch is, for example if you wanted it would be possible to be doing 80 mph in 4th and by the above method and a very heavy rev in between you could select 2nd with no crunching whatsoever. now i know the box would blow up if you let the clutch out, but if you tried the same thing but this time just pressed the clutch once and then tried to select 2nd you would hear the most almighty grinding noise ever. thats the principle reason for the above. you bring the next gear down upto the correct revs so that when you release the clutch the revs are already at the right speed..bernie __________________ fancy the south of france. http://st-tropez.mysite.orange.co.uk/

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17th March 2007, 12:15 AM	#76 (permalink)
brianbunning GTR Register Member Join Date: Jul 2006 Posts: 51	have a slight crunch when changing at high reve from 4th to 5th but nowt major, gonna try some heavy shockproof oil, how much will i need?

4th April 2007, 08:56 AM	#79 (permalink)
Floyd GTR Register Member Join Date: Dec 2004 Location: S-wales Posts: 314	I remember reading somewhere that the Toyota 6speed R160 getrag box is the same as the R34 getrag, perhaps there's someone who can confirm this, or tell me I'm wrong?

26th July 2007, 05:45 PM	#81 (permalink)
GTR RGT GTR Register Member Join Date: Aug 2006 Posts: 1,941	What weight (w) is Redlines heavy shockproof? And am I right in saying I need 4.1 litres to feel my gear box? 1st and second hate me

26th July 2007, 06:04 PM	#82 (permalink)
myline GTR Register Member Join Date: Dec 2005 Posts: 920	Go to Turbobits for best prices on Redline

11th August 2007, 08:12 AM	#84 (permalink)
Bucky GTROC Member Join Date: Mar 2003 Location: Newcastle Posts: 458	Why the ** do you want to double de-clutch a box with syncro's?? Do you's know what yous are talking about?? You only double de-clutch a crash box or a very **ed standard box.

11th August 2007, 09:21 AM	#85 (permalink)
ru' New Users Join Date: Feb 2007 Location: Black R33 GTR V-Spec Posts: 1,915	I've never DDC (life's too short), but I often H&T. Having said that I've never driven a car without synchros.

19th August 2007, 07:34 PM	#89 (permalink)
TidyTobes GTR Register Member Join Date: Jun 2007 Location: Lincolnshire Posts: 25	Just 3rd to 4th on mine, will get round to it some time??

27th September 2007, 11:41 PM	#90 (permalink)
GT-R Glenn GTR Register Member Join Date: Nov 2002 Location: Waiuku NZ Posts: 1,226	OS Giken 1st to 5th Love it. I will most likely change my diffs to gts4's.