5K Gearbox Selection

[B-Rad]

Current I'm running a supercharged 5K with 134kw at the wheels. I have just destroyed the T50 and clutch. So now I need to replace them. I don't know what punishment the T50 has been put through before me but all gear are shagged. I'm currently running a 4k flywheel with 180mm cable clutch.

 

Can you fit a 5K flywheel inside a T50 bell housing? Will the starter motor still bolt up? Is a lighten flywheel worth the time for a daily driver? What weight have people got the flywheels down too?

 

Options 1 T50 with new 4K HD clutch ($500)

 

2 T50 with new 5K HD clutch and flywheel ($550)

 

3 W5X with new 5K HD clutch and flywheel ($1700)

 

W5X would be nice but its a lot of work and cash to fit a hydraulic clutch. What power can a T50 handle? What brand clutch do people recomend (Exedy or Clutch Industries)? I have always used Exedy but CI are 1/2 the price.

[Taz_Rx]

Yes a 200ml flywheel will fit in the bell housing.... But the pressure plate (for say an ae71 kit) will not - i tried and failed.

I've been running well over 100rwkw through my t50 for years now with no problem. Maybe just try a new clutch and t50. Otherwise look into a k-w50 setup, which is also still cable rather than k-w56/7/8 etc

[B-Rad]

So to run 200mm clutch I need to go to a W5X box. So to upgrade to a W50 I need K-W bellhousing, 5K flywheel, 200mm clutch, tail shaft and build a crossmember. Gearbox output shaft is different so I would need to change the yoke as well. Is the tailshaft the right length or do I have to find one? The only advanagte I see of the W50 over the T50 is stregnth. So for the work I might as well fit a W58 for the gear ratios.

 

Any recomedations of clutches? Exedy or Clutch Industries?

[Taz_Rx]

W50, t50 and k50 are all the same length so you just need to change the spline on the gb end.

I prefer exedy's.

 

The draw back with the w58 etc (over w50) is cost and the fact you need to convert to hydraulic.

[Clapped out]

+1 for excedy.

[B-Rad]

So my plans are W50 gearbox behind 5K flywheel with an Exedy HD clutch (TYK-6319HD). Just need to pick up the parts this weekend. Get the flywheel machined. Put it together. Fabricate a gearbox cross member. Fit yoke to tail shaft with an old holden uni.

 

What’s everyone thoughts on lightened flywheels? My engine builds revs really quickly so probably no need.

[Taz_Rx]

Should just buy this fw....

http://www.rollaclub.com/board/topic/66286-clutch-plate-help-please-21-spline-k50/page__pid__659494#entry659494

Might encourage him to go the way I think he should!.....or you buying mhmills setup?

[mhmills]

Should just buy this fw....

http://www.rollaclub...494#entry659494

Might encourage him to go the way I think he should!.....or you buying mhmills setup?

I'm assuming this is the bloke that was texting me earlier today lol.

[B-Rad]

I bought mhmills setup

 

Now to get a clutch and put it all together

[B-Rad]

Clutch is on its way (TYK-6286HD). Flywheel is getting lightened and faced. Just need to find a RA40 yoke and hope it all goes together.

[B-Rad]

Got the flywheel back from the machine shop. Its now 2.5kg lighter and has been balanced with pressure plate. RA40 yoke is on the way should see it today. Just need to find the correct uni joint. I have been looking through the catalogs but can't find something that would work. Taz_Rx what is the part number for the uni you used?

Edited July 9, 2013 by B-Rad

[Taz_Rx]

Never ended up fitting mine as I ended up with a k-t instead. I took a tail shaft to a mechanic and he reckoned it could be done with some old holden uni.