6 speed box onto a speed 6 engine?

[DonkeyApple]

In essence, is there a very simple solution/product to do the job (i.e. remove original 5 spd and replace with new 6 spd without any faffing about) or is this something to is more of a 'project'?

[PascalBuyens]

I believe the T56 is a bit longer, so you'll need a shorter driveshaft.

Other than that, I can't see much of a problem fitting one...

[yzf1070]

You will most certainly need to mod the bell housing as well. If you are serious have a chat with this gadge.... top dog, but please don't waste his time.

http://www.gearboxman.co.uk/

G

[WorAl]

Can I just ask, why are you wanting to do this? I was thinking of it due to feeling the car needs an extra gear for cruising. However, why not replace the diff with a taller one? and maybe rebuild gearbox with a taller 5th if you need to? won't be anywhere near as expensive.

[JonRB]

Racing Green have been developing / evaluating a Quaife 6-speed sequential box. It'll be available with a manual lever or, for yet more dosh, a robotised paddle shift system.


http://www.flickr.com/photos/jonrb/3319955151/in/s...

[450Nick]

JonRB said:

Racing Green have been developing / evaluating a Quaife 6-speed sequential box. It'll be available with a manual lever or, for yet more dosh, a robotised paddle shift system.


http://www.flickr.com/photos/jonrb/3319955151/in/s...

That'll be a Geartronics paddle control system. Just bought one of these for my Tuscan Challenge Car. Top bit of kit, but as has been said, not cheap! I've heard that the Quaife boxes are a bit st though so I wouldn't go down that route. I've gone for an Elite IL-300 6 speed. Not sure I'd want one of these systems in a road car though, its a dog box so not likely to be much fun in traffic...

[PascalBuyens]

Had a Quaife dog gear box in my Elise... Best thing ever I installed in that car

[dvs_dave]

Wow, 6k for the box and a further 3k for the shift system. Is it that much better? Also looks to have straight cut gears so will be noisy as hell.

Other than expense, why aren't sequential boxes normally fitted to road cars?

Edited by dvs_dave on Monday 19th April 23:28

[DonkeyApple]

dvs_dave said:

Why aren't sequential boxes normally fitted to road cars?

Good question.

I've driven a few sequential cars on circuits, they seem very noisy and I'd imagine that the changes when moving normally would be very rough.

I guess an auto box is simply a smarter option for road use.

[450Nick]

No synchros in these boxes so engaging 1st may require a bit of effort from a standstill, and I would have thought they'd have quite harsh changes which is fine in a track focussed car, but not so nice if its your daily driver. PLus of course the noise of a straight cut box!.

The geartronics system isn't small either, you need somewhere to locate the air compressor, air tank, valving and GCU, then there's the issue of wiring it up to your throttle linkage so it can do its auto blip function. This also requires the engine to respond very quickly as the gear shift time depends entirely on how quickly the engine can meet the required revs to engage the next gear. TVR engines do rev quickly, but the system is designed for F3 cars, on which it can achieve 30ms shift times.

Edited by 450Nick on Tuesday 20th April 08:30

[GT TVR]

Been thinking about a 6 speed gearbox too. Have the CR box with the 3.91 diff which is fantastic but it could use a 6th gear (something like 0.65) for cruising.

[kcc]

Gerio, Hi, 6 speed box? did'nt think you were that worried about a standard Tamora keeping up with you on some of those spirited drive's we had last couple of weeks,great fun.

[GT TVR]

hi Ken,

Yeah was great fun! Must say I was happy to be able to keep up with you on the track with your soft rubber

Would like a 6th gear for cruising with my short diff and all.

[RichardD]

For road use, I think this (latest T56):-

http://www.jegs.com/i/Steeda/957/TUET11009/10002/-...

would be about perfect as the ratios seem the same as the T5 CR, but with a 6th ratio too.

[WorAl]

RichardD said:

For road use, I think this (latest T56):-

http://www.jegs.com/i/Steeda/957/TUET11009/10002/-...

would be about perfect as the ratios seem the same as the T5 CR, but with a 6th ratio too.

Measure it first, not sure it will fit well in tunnel, they are wider than the T5. They do go, but not sure if they hang further down so reduce ground clearance.

Also will have to get a bell housing made for it.

[JR]

WorAl said:

RichardD said:

For road use, I think this (latest T56):-

http://www.jegs.com/i/Steeda/957/TUET11009/10002/-...

would be about perfect as the ratios seem the same as the T5 CR, but with a 6th ratio too.

Measure it first, not sure it will fit well in tunnel, they are wider than the T5. They do go, but not sure if they hang further down so reduce ground clearance.

Also will have to get a bell housing made for it.

350Matt designed one for the T5 but there wasn't enough interest. IIRC he wanted a run of about ten to make it economic.

[WorAl]

JR said:

WorAl said:

RichardD said:

For road use, I think this (latest T56):-

http://www.jegs.com/i/Steeda/957/TUET11009/10002/-...

would be about perfect as the ratios seem the same as the T5 CR, but with a 6th ratio too.

Measure it first, not sure it will fit well in tunnel, they are wider than the T5. They do go, but not sure if they hang further down so reduce ground clearance.

Also will have to get a bell housing made for it.

350Matt designed one for the T5 but there wasn't enough interest. IIRC he wanted a run of about ten to make it economic.

Are you talking bell housing here? If you could get me a drawing, or dimensions/bolt patterns I could have them drawn up and machined for anyone. However it may be expensive if one-offs.

[GT TVR]

RichardD said:

For road use, I think this (latest T56):-

http://www.jegs.com/i/Steeda/957/TUET11009/10002/-...

would be about perfect as the ratios seem the same as the T5 CR, but with a 6th ratio too.

Indeed, this seems about perfect; first gear a bit too short maybe if I were to go down the 4.5 route and kept my 3.91 diff.
Thanx!

[JR]

WorAl said:

JR said:

WorAl said:

RichardD said:

For road use, I think this (latest T56):-

http://www.jegs.com/i/Steeda/957/TUET11009/10002/-...

would be about perfect as the ratios seem the same as the T5 CR, but with a 6th ratio too.

Measure it first, not sure it will fit well in tunnel, they are wider than the T5. They do go, but not sure if they hang further down so reduce ground clearance.

Also will have to get a bell housing made for it.

350Matt designed one for the T5 but there wasn't enough interest. IIRC he wanted a run of about ten to make it economic.

Are you talking bell housing here? If you could get me a drawing, or dimensions/bolt patterns I could have them drawn up and machined for anyone. However it may be expensive if one-offs.

No, this was the box. Matt (ex-Cosworth F1 engineer) designed a sixth gear to fit onto one of the shafts. (edited to correct quotes.)

Edited by JR on Thursday 13th May 13:40

[GT TVR]

Had a brief talk with my dealer: seems the T56 is too wide to fit. Need to find a solution ...