Gearbox for highboost! - Transmission Forum - Peugeot 306 GTi-6 & Rallye Owners Club

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Subject: Gearbox for highboost!

superchargedblack1997gti6

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Post #1

Right am looking at options for gearbox for my super highboost does anyone have any sensible suggestions advice or anything? My car decided to s**te it's gearbox on the dyno and I'm not really interested in p**sing around not averse to any suggestions or recommended substitute gearboxes? Rather not go sequential as I will be limited in class that I can enter competition with Thumbs up

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Super high boost Completed, destroyer of gearboxes and 160mph club

Posted 25th Jul 2015 at 12:35

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allanallen

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Location: Buxton

Registered: 01 May 2007

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Post #2

Have you looked in to converting to an ML box?

Is there an off the shelf sequential available that will handle the torque of a F/I car?

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Posted 25th Jul 2015 at 13:00

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barrym

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Location: Westcliff-on-sea

Registered: 26 Jun 2014

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Post #3

How much torque are you making?

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Posted 25th Jul 2015 at 13:15

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superchargedblack1997gti6

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Post #4

Yes sadevs new transverse setup will handle it, got a quote of 12.5k including paddle shift. But as I say that puts me in class with 1000bhp evos which is pointless in my eyes. Ml gearbox yes that's all good apart from there is no lsd available. I've spoken to a couple of gearbox manufacturers about a one off gear kit for the Box but the way I feel now I'm better off just binning the whole project as it seems nothing is available.

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Super high boost Completed, destroyer of gearboxes and 160mph club

Posted 25th Jul 2015 at 13:16

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allanallen

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Post #5

Does that 12.5k include the bell housing, shafts etc etc?

I thought there was a quaife did a an LSD and 3j were making a batch?

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Posted 25th Jul 2015 at 13:34

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allanallen

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Post #6

Not that you'd want a quaife! :p

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Posted 25th Jul 2015 at 13:35

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welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

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Post #7

yeah, 3j have made a batch afaik.

surely must be something available for the ML as that's what the early 306 maxi/group A cars ran.

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Posted 25th Jul 2015 at 13:45

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superchargedblack1997gti6

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Post #8

Yep but it is going to handle 360lbft? Just losing interest due to reliability I spent £300 on Wednesday to do £1500 worth of damage. Haven't even made it onto track yet Sad

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Super high boost Completed, destroyer of gearboxes and 160mph club

Posted 25th Jul 2015 at 14:57

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allanallen

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Post #9

I believe an ML will handle that sort of torque yes, I have no personal experience though im afraid.

Other than that you need to start looking at other manufactures... Ford, Saab, Volvo perhaps?

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Posted 25th Jul 2015 at 15:00

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superchargedblack1997gti6

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Post #10

I agree other than that I thought Honda as the civics have updated gears available with different ratios available, I've found a company that builds ml sequential boxes,just going to treble the cost of my conversion and how do the sequentially react on dyno? Don't want to be snapping one of those at 12 k

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Super high boost Completed, destroyer of gearboxes and 160mph club

Posted 25th Jul 2015 at 15:07

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allanallen

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Post #11

I'm not sure how good the synchros are in the boxes they use in the k20/ep3??

Sequential is no different on a dyno?! Unless you don't know what you're doing when trying to set flat shift or auto blip up I guess.....

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Posted 25th Jul 2015 at 15:21

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welshpug!

Capt Pedantic

Location: Bigend, Wales.

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Post #12

throttlebodies are the answer.

Ninja

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Posted 25th Jul 2015 at 15:24

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Day666

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Post #13

I really really feel for you Ross !

Was speaking to a guy & his sister with a super fast super charged Golf at Combe last week & a chap with a Turbo charged Audi & both were complaining of similar problems ...one was using Drenth stuff & said its amazing ?
The other Quaife stuff but still they were telling me of Gearbox failures & the Golf was 400bhp not 500 like yours ....
I believe Drenth do heavy duty boxes that take 500nm ?
Have a look on there website if you haven't already Thumbs up

I really do hope you find a sensible price ML gearbox & 3j plate diff & strengthened driveshafts ...I'm not even sure if you were crazy enough to go Sequencel that it would take all your Torque ?

Please don't give up and keep us posted .....
Small set back m8 Thumbs up

This from 2010 from Miles on here !!!!

miles wrote:

The ML box fit's and is allot stronger than the BE box, But it's twice as heavy, Needs a cable conversion unless you can fit a master cylinder on the clutch pedal and custom shafts as the inner splines are different, Also is using the 2.0 turbo version then I would add another 2 planet gears like the V6 or a ATB diff dare I say it

Posted 25th Jul 2015 at 16:03

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Day666

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Post #14

welshpug! wrote:

throttlebodies are the answer.

Ninja

Must admit Mei I'm so glad I listened to you & took your advice Thumbs up

Can't wait now to get my dash out next week & shed some serious weight from behind there m8

Going Back to Ross problem ...there must be something guys without spending 10k plus ?????

Really hope you get to the bottom of what caused it other than Torque Thumbs up

Posted 25th Jul 2015 at 16:05

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rich_w

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Post #15

Why don't you hold your horses until you've found out the exact cause of failure of yours? I think we need to understand what the issue is before considering next steps.

Wayne's previous advice to me was to fit a Japanese box - the gears are generally superior to European stuff. Box out of a K20 engined Civic should be reasonably straight forward to fit, and they can take a fair bit of power.

Smile

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Posted 25th Jul 2015 at 15:48

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pete_rallye

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Post #16

Think you'll find your limited in classes you want to race in anyway with a supercharged engine that was NA as standard. You'll likely end up in the 'anything goes' class. Any idea which series you're looking at?

Reliability is always going to be an issue when you have modified things t the extent you have, especially if you plan to race it. Agree with Rich though, find out exactly what the cause of the current boxes failure is before panicking. However I've heard of a few Honda boxes going bang with the TTS sc conversions, but they do tend to run higher rpm.

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Posted 25th Jul 2015 at 16:16

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rich_w

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Post #17

I think something can't of been right to start with... a dyno puts far less load on the car than the road does Smile

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Posted 25th Jul 2015 at 16:52

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barrym

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Location: Westcliff-on-sea

Registered: 26 Jun 2014

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Post #18

Mk2 Focus RS puts out 340lb/ft in RS500 trim and over 400bhp and lb/ft when mapped?

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Posted 25th Jul 2015 at 18:15

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superchargedblack1997gti6

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Registered: 15 Aug 2009

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Post #19

I just don't know what to do Sad

the issue is I have a lot of money invested in a car that I can no longer drive. Just want an answer gearbox will be out Monday until then we won't know what actually failed. But it must of been something substantial to have broken the lsd as well.

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Super high boost Completed, destroyer of gearboxes and 160mph club

Posted 25th Jul 2015 at 19:11

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rich_w

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Location: Havant, Hampshire

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Post #20

How do you know the diff is broke?

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Posted 25th Jul 2015 at 19:37

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rich_w

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Post #21

Ross, just stick a standard box in it for now, as an interim measure whilst we look at the failure mode of your gearbox.

It could be anything... can you save some of the oil in a container when you remove it, it may need to be analysed Smile

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Posted 25th Jul 2015 at 19:40

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superchargedblack1997gti6

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Post #22

Only turns one wheel when off the floor?

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Super high boost Completed, destroyer of gearboxes and 160mph club

Posted 25th Jul 2015 at 20:11

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v6saloon

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Location: Ilkeston

Registered: 24 Sep 2010

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Post #23

There may be a batch of diff's being made for the ml box, I'm waiting to find out if it's got the go ahead yet, they've currently got a gearbox and waiting on them to say if they are going to do it or not, but if there were some people who would definitely be interested in 1 then that might sway them :-)

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Posted 25th Jul 2015 at 20:21

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rich_w

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Post #24

When the engine is running in gear, or when you turn one of the wheels by hand?

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Posted 25th Jul 2015 at 20:23

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v6saloon

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Registered: 24 Sep 2010

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Post #25

And just to add its not a quaife :-)

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205 mi16
405 Mi16x4 restoration project
406 v6 saloon track car project/daily driver
508 Hdi

Posted 25th Jul 2015 at 20:23

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