Nissan Skyline r33 gts rear end conversion into my VL!
 
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What I’m doing with my rear end is a little different. Instead of the usual spool or 9" conversion, I’m
going to fit an r33 gts skyline rear k-frame complete. That’s IRS, viscus LSD, 4.11:1 gears, large vented
brakes with twin piston callipers and it's the correct width too. Also I’ve never heard of these things braking,
even in a 9sec car, so they are strong! Other advantages are adjustable camber and tow, much lighter
unsprung weight, coil over struts and rear wheel steering not that it will be used...
At the jap importers I picked up this rear end from, they had a z32 300zx K-frame lying around also, it has
a wider track but the suspension arms and uprights are the same as the skyline, the only difference being the
300zx has aluminium uprights and the skyline has cast uprights (and different shocker mounts). My thinking was
the alloy one's have to be lighter so after a little chat to the boss I started to swap them over! After mucking
around for ages and removing the seized axles from the hubs I finally managed to get them all pulled down.
The weight difference is 2kg, with the cast one's weighing 5.3kgs and the alloy one's weighing 3.3kgs, Worth the
effort! I wish I could have used the entire 300zx rear end as it is a gorilla, bigger center, bigger CV's, axles
and splines!
To mount all this to the bottom of a VL shouldn't be too difficult with the frame mounting on 4 pins which line up
ok with the chassis rails! It's just a matter of welding these in the right place with appropriate gusseting and
bracketing. The shocker towers also require a fair amount of modification but line up too!
I will detail the installation on here when I get up to doing it! So far I have spoken to an engineer about the
roadworthiness of this, it's all good! And a race suspension shop about rear coilovers to suit, no probs there either!
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18/7/03
The first pic shows one of the front mounting plates from underneath. You can see the bolt head with
gusseting to the top plate. The middle pics is the rear left mount underneath, showing the gusseting.
And a shot of the left hand shocker tower from below (above up-side-down). You can see how I have trimmed
the edge of the chassis rail back to the vertical to allow enough room for the spring when the wheel
is fitted.
I have tacked the shocker towers in the correct position as well as the all the mounts
are permanently tacked in ready to be welded so basically it's just a matter of making up the rest of the
plates to strengthen and fill in any holes and welding it all up properly and it'll be finished! :D
I have also removed the hubs and taken them to the engineers to have the stud pattern changed.
He said he will fill the stud holes by bronzing and then re-drill them in a mill, MIGing the holes up
doesn't work as it makes hard and soft metal that is impossible to re-drill in the right spot...
Next on the to do list is making the strut and spring tops, as I now have the expensive spherical bushes
to make cups for!
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16/10/03
I've been pretty slack updating this, but I haven't been slack on my car!!!
The rear end mounting is all finished, painted (mat black) and all bolted up. The car is back on the ground
and rolling. I have dropped in a stocky engine and I’m just working on the minor details, brake lines,
tail shaft, fuel tank, ect. Another 2 weeks and it should be ready to take for a spin!!!
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2/11/03
It's finished!!! Well enough to drive and race it!
With a fun day at my nearest race track (Winton motor raceway) approaching at short notice I really had to put in some hours
get the rear end and brakes completed, but it was all worth it! With the VL only ready to go late
saturday night before the fun day on sunday, I was lucky nothing went wrong.
So here is some results of the conversion,
Ride is improved but not greatly, still rough but not as harsh over larger bumps. Softer springs would help!
General handling feels more responsive but that may be just because I’m used to my pulsar...
Hard cornering resulted in massive oversteer even with the stock non turbo engine but very controllable
with no tank slapping! On the track this was very fun but not very fast. Checking the rear toe found the
problem having 4mm of toe in (difference in width from front to rear of the rear tyres), I adjusted it to
2mm of toe out. That made the rear stick to the track like glue and I found it very hard to drift around
corners after that as the front understeers all the way around...
Being a 'fun day' the tracks lap timers weren’t running but the stop watch was! Clocking a best time of
1:57 with traffic was good considering I am down 120hp without the turbo engine when I did a 1:52 late
last year.
Overall I’m extremely happy with the conversion with the only thing I’m a little disappointed with being
the viscus LSD slipping a lot, and I think softer springs would help but I’ll wait until I get the front
to grip before changing spring rates. I have plenty of adjustment to play with in the mean time ;)
Heaps of pics to come of the rest of the little mods needed to make it all go and fit!
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4/12/03
Here's most of the finishing touches!
To fit the tail shaft was easy, just removed the flange off the diff and had the locating center machined
out and 4 new holes drilled to suit the standard VLt tail shaft.
And the center bearing mounting bracket required the bolt holes slotting as the diff is about 5mm forward
of the old diff. The yoke just sits in the gearbox 5mm further, no problem!
The fuel tank was a little more difficult with the front of the tank in the way of the rear steering rack
and motor. I could have removed the rack and made a bar to replace it but I think that would have been
more difficult than modifying the fuel tank plus I want to have a play around with the rear steering
one day!
So I cut the front off the tank and welded a new plate in but I shifted the fuel sender the wrong way
so it sits directly behind the rack gearing... It clears by about 3mm... Plans are to make an aluminium
tank!
I am still yet to hook up the hand brake and finish off the brake line mounting.
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25/03/04
Hand brake is hooked up and works but it's not perfect and need changing, cable
almost touches the tail shaft.... The lever ratio on the handle is too great, meaning
it pulls all the way up before working and is fairly light.
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29/05/04
I've made up a new fuel tank to clear the rear steering rack. I got hold of another tank and cut the
front off. I had to move the swirl pot back and to the drivers side a little so the sender would still
sit inside. Pretty simple, just time consuming to fix all the leaks ect. Fits well!
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