VN-VS tailshaft capabilities?

[delcowizzid]

2 peice

[ejukated]

I killed one CV, well actually it was faulty from get go (aftermarket) as it was too tight to even move, basically seized. I thought at the time being new it much be how they come and they wear in. 200+ K latter it was still too tight to move and started to chew out.

So that was nothing to do with power, just shit quality. Everything else I have never had issues with regardless of abuse but all of them have been not a lot more than stock v6 outputs.

However an engine design I' m playing with basically an l67 which I'm trying to keep tame simulated at close to 580hp about 550 ft-lb flat line at 16psi but its getting tricky getting it less to save stuff breaking because I will be running the Whipple SC in below its best operating range if I run any lower boost and the pulley be huge potentially hitting the bonnet. Anyway, I can manage with the rest of the drive train holding up but tailshaft I haven't really seen anything thats an upgrade for them.

I feel that with those torque figures the tailshaft will just snap off instantly really damaging the crap out of the car underneath

What specs are you running on the L67?

[vlad01]

It's just a simulated design at this stage.

ZZP aluminium heads
Stock displacement
Optimised cam for max area under hp curve from 2000-6500 rpm
9.4 cr based on stock 8.5 specs and head gasket thickness with zzp heads.
Whipple 2300ax at 2.2 belt ratio at 16psi. (Turned down yella terra kit)
Non intercooled
Dedicated E85.

[Dylan]

Morrison CV and driveshafts in Bendigo. Seen good results from here.

[ejukated]

It's just a simulated design at this stage.

ZZP aluminium heads
Stock displacement
Optimised cam for max area under hp curve from 2000-6500 rpm
9.4 cr based on stock 8.5 specs and head gasket thickness with zzp heads.
Whipple 2300ax at 2.2 belt ratio at 16psi. (Turned down yella terra kit)
Non intercooled
Dedicated E85.

Nice be an interesting build. When were you thinking of building it? Be great to make a thread on here

[vlad01]

Will start getting bits after the red vp is done. So be a while. Plus need a better paying job

[VK_3800]

The small diameter isn't too much of an issue with Commodore drive shafts due to being so short (because two piece). Getting a 1330 yoke is a bit of a pain though, I ended up using a old slip yoke that is reasonably large diameter and sleeving it to fit the tube. CV joint will withstand plenty, the one in my Torana still has the standard rear uni which hasn't been an issue with hard launches and slicks, although we're not talking 500ft-lb torque (yet).

[vlad01]

Yeah I have to use a Dana spicer 1330 yoke because the Astro main shaft was designed around it. Older 28 spline yokes are 1 thou smaller and don't fit aka stock T5 yoke. So I got that already worked out.

[VK_3800]

Talking about the matching weld yoke to fit the Commodore shaft, its an oddball diameter tube. A lot of Tremec boxes use the 28 spline yokes with the 1330 uni.

[vlad01]

Yes I found this too. Common sizes are 2, 2.5, 2.75, 3 etc.

Holden used 2.25". Good news is the tube yoke for 2.5 has tons of mean to be machines down to 2.25. The other thing is the commodore tube happens to be a thicker wall than most standard tube so extra strong for its diameter.