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Author Subject: Sequential gearbox
ricknorbat

Newbie

Location: Asker

Registered: 26 Mar 2008

Posts: 13

Status: Offline

Post #1
Where can I get a 5 or 6 speed dog-shift box for my 306 gti-6 to a OK price?

or

a strong 6 speed manual gearbox whit dif?

my 3 and 5 gear is broken. Got 240 HP (N/A tuned)

Posted 24th Jan 2010 at 17:03
SteviePut

Seasoned Pro

Location: Down south

Registered: 20 Oct 2005

Posts: 13,624

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Post #2
How much money are you will to spend? A sequential would be silly money. IIRC Pug sport sell 5 speed dog gear set. I'm not 100% on that thoLOL

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Posted 4th Jan 2010 at 04:24
fletch

Track Head

Location: The nearest Shell garage

Registered: 12 Jun 2004

Posts: 12,268

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Post #3
Whats an 'OK' price? Laugh

You're going to SERIOUSLY dip into you pocket for something youre asking?

Perhaps a 6 speed BE box with shot peened or cryo-frozen internals might cut it? IT would be a damn sight cheaper too.

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Posted 4th Jan 2010 at 04:31
cabbymeg

Regular

Location: Alfreton/Derbyshite

Registered: 04 Sep 2009

Posts: 323

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Post #4
I can't really see the need. There are plenty of people running that power and more on this site on std 'box's
Posted 4th Jan 2010 at 04:33
ricknorbat

Newbie

Location: Asker

Registered: 26 Mar 2008

Posts: 13

Status: Offline

Post #5
The reason why I am looking for a dog shift are because my gearbox is broken. It is fun to drive toSmile

If there is posible to get a strong 6 shift manual box whit a good dif to a much lower cost, I am up to itHappy

ps. Not sure about price yet, because I have not been able to do some resourch.
Posted 4th Jan 2010 at 04:34
ricknorbat

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Location: Asker

Registered: 26 Mar 2008

Posts: 13

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Post #6
fletch wrote:
Whats an 'OK' price? Laugh

You're going to SERIOUSLY dip into you pocket for something youre asking?

Perhaps a 6 speed BE box with shot peened or cryo-frozen internals might cut it? IT would be a damn sight cheaper too.


What is the price for this in UK? I live in NorwayRoll eyes
Posted 4th Jan 2010 at 04:37
fletch

Track Head

Location: The nearest Shell garage

Registered: 12 Jun 2004

Posts: 12,268

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Post #7
ricknorbat wrote:
fletch wrote:
Whats an 'OK' price? Laugh

You're going to SERIOUSLY dip into you pocket for something youre asking?

Perhaps a 6 speed BE box with shot peened or cryo-frozen internals might cut it? IT would be a damn sight cheaper too.


What is the price for this in UK? I live in NorwayRoll eyes


Probably about

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Posted 4th Jan 2010 at 04:41
buzzbrightyear

Seasoned Pro

Location: hiding all receipts for car

Registered: 09 Jul 2008

Posts: 11,239

Status: Offline

Post #8
ricknorbat wrote:
fletch wrote:
Whats an 'OK' price? Laugh

You're going to SERIOUSLY dip into you pocket for something youre asking?

Perhaps a 6 speed BE box with shot peened or cryo-frozen internals might cut it? IT would be a damn sight cheaper too.


What is the price for this in UK? I live in NorwayRoll eyes

i thought you was in york.

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Posted 4th Jan 2010 at 04:51
pete_rallye

Seasoned Pro

Location: Yorkshire

Registered: 12 Dec 2002

Posts: 4,911

Status: Online

Post #9
Sadev dog box is around

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Posted 4th Jan 2010 at 05:09
fletch

Track Head

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Registered: 12 Jun 2004

Posts: 12,268

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Post #10
pete_rallye wrote:
Apparently straight cut gears aren't as strong as helical cut as there is less surface area on the teeth to help spread the load.


Surely there is more surface area with straight cut Pete?

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Posted 4th Jan 2010 at 05:41
Welly Forum Admin

Location: Brizzle

Registered: 11 Jan 2004

Posts: 21,797

Status: Offline

Post #11
fletch wrote:
pete_rallye wrote:
Apparently straight cut gears aren't as strong as helical cut as there is less surface area on the teeth to help spread the load.


Surely there is more surface area with straight cut Pete?

Thought it was more to do with shear forces.
Dog boxes are quite harsh on the change and knock the teeth hard.

I'll dig iut something i did ages ago in the Admin section about gearboxes for an FAQ i did to explain them all

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Posted 4th Jan 2010 at 05:45
fletch

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Post #12
fletch wrote:
pete_rallye wrote:
Apparently straight cut gears aren't as strong as helical cut as there is less surface area on the teeth to help spread the load.


Surely there is more surface area with straight cut Pete?


Scratch that, makes sense when you think about it.

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Posted 4th Jan 2010 at 06:14
cress87

Seasoned Pro

Location: Norwich

Registered: 30 Mar 2007

Posts: 11,360

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Post #13
Helical gears do have more surface area and that's why they can accept more load than straight cut gears. Yes

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Posted 4th Jan 2010 at 06:22
adam b

Seasoned Pro

Location: Prescott Hill

Registered: 24 Jan 2006

Posts: 12,070

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Post #14
How much torque are you trying to put through it? There was also a thread on using ML gearboxes instead as they are stronger.

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Posted 4th Jan 2010 at 14:08
binkagti

Seasoned Pro

Location: canterbury

Registered: 14 Oct 2006

Posts: 2,410

Status: Offline

Post #15
Dont think any need really for the gearbox, i was using a standard gearbox with kaaz diff with around 460ft/lbs and that was fine. Just my opinion

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Posted 4th Jan 2010 at 15:46
welshpug!

Capt Pedantic

Location: cwmcarn...

Registered: 27 Mar 2007

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Post #16
how often did you REALLY use that 460 lbs though? and when you did, I bet it was all wheelspin Laugh my ass off

Sadev do a box that'll do the trick, its about 18k with the bellhousing and driveshafts IIRC.

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Posted 4th Jan 2010 at 15:59
binkagti

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Location: canterbury

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Post #17
a fair amount of abuse, not a full track day mind. And yes mostly wheelspin lol

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Posted 4th Jan 2010 at 16:00
rich_w

Seasoned Pro

Location: Havant, Hampshire

Registered: 29 Jul 2004

Posts: 5,047

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Post #18
binkagti wrote:
a fair amount of abuse, not a full track day mind. And yes mostly wheelspin lol



Tom,


How is your car doing now?


Is it all sorted?


Cool

Rich

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Posted 4th Jan 2010 at 17:13
mechanical_repairs

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Location: leicester

Registered: 10 Jan 2005

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Post #19
rich_w wrote:
binkagti wrote:
a fair amount of abuse, not a full track day mind. And yes mostly wheelspin lol



Tom,


How is your car doing now?


Is it all sorted?


Cool

Rich



As above as last time i heard you had some problems with it.

Carl

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Posted 4th Jan 2010 at 17:17
dj_turbo

Regular

Location: Shaftesbury

Registered: 11 Jun 2005

Posts: 219

Status: Offline

Post #20
The sadev is 6k bare when we fitted in in james car he didnt have any change from 10k but after driving it its worth every penny!
Posted 5th Jan 2010 at 00:38
welshpug!

Capt Pedantic

Location: cwmcarn...

Registered: 27 Mar 2007

Posts: 21,980

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Post #21
is that on a 1600 engine? that is limited in how much torque it can take, even a standard 2.0 XU is close on that box, needs to be the next one up in the range Smile

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Posted 5th Jan 2010 at 00:50
pete_rallye

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Location: Yorkshire

Registered: 12 Dec 2002

Posts: 4,911

Status: Online

Post #22
The sadev dog box will only take 181 lbft, the bigger sequentials are better though and will take 250 lbft. The only FWD sequential I have found that will take a lot of torque is the Hewland EGT which will take 300 lbft. Thats

________________________________________

Oulton Park in a BTCC 306 vid 1
Oulton Park in a BTCC 306 vid 2
Lap of the 'ring
Posted 5th Jan 2010 at 01:16
dj_turbo

Regular

Location: Shaftesbury

Registered: 11 Jun 2005

Posts: 219

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Post #23
Thats the 6 speed st74 i think that we used in james its only 1400 so no a problem as stated its not ratted to 200lbft but steve at swr says hes sold them to people who are putting that through them with no problem but have to be taken care of and the shift cut set correctly. sadev do another model up it was around 2k more when i was looking at fitting it in mine.
Posted 5th Jan 2010 at 01:24
pdd144c

Senior User

Location: Southampton

Registered: 09 Dec 2005

Posts: 550

Status: Offline

Post #24
I had a couple of Hewland HP 2000 a few years back and they were only rated to approx 300 nm off the top of my head. The problem is the fact they are FWD, the only FWD race cars tend to be 2.0 N/A engines, hence why the boxes are designed to cope with their kind of power/torque figures.

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Posted 5th Jan 2010 at 02:51
ricknorbat

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Location: Asker

Registered: 26 Mar 2008

Posts: 13

Status: Offline

Post #25
It`s a 2.0l (standard gti-6 engine) xu10j4r

I can see that the price is not cheap for a dog boxRoll eyes

Posted 5th Jan 2010 at 03:04

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