6-bolt Driveshafts Into 32 Gtst

[bubba]

Well I picked up my 3.9 auto S13 diff yesterday and it turns out it has 6-bolt flanges, because of this I was also supplied with the driveshafts.

What I'm wondering is, are the driveshafts a straight swap with my 5-bolt items? I'm thinking this would be a hell of an upgrade to go along with the 2way diff.

Basically I have a full Nismo 2way kit (came with new 5-bolt halfshaft flanges, bearings, gaskets etc.), are the halfshaft flange bits interchangeable (i.e. no dramas swapping the 6-bolt flanges for the 5-bolt ones, in the diff that is) in case the driveshafts aren't a straight swap.

Help! need to sus out which way to go before I drop my bits off at the diff place.

Cheers

[bryyy]

What benefit if any is there of having the 6 bolt flanges?

You have brand new 5 bolt half shafts with the 2-way.. which will bolt straight up to your standard driveshafts... and i dont see why they wont work in your 3.9.

[bubba]

The 6-bolt driveshafts are MUCH thicker. I have heard of people upgrading their gtst shafts to GTR shafts (which is pretty much what these are).

The way I see it is if I upgrade the shafts while I'm doing the diff then I shouldn't have to ever worry about the rear end again.

Just need to hear from someone who has done it as to whether the shafts just drop straight in or if I need GTR hubs or some other modifications done..

[Cubes]

Depends on what 6bolt you are talking about.

If its the Silvia 2x3 6bolt (3 groups of 2 bolts totalling 6) then its no difference to the GTST's, stick with the 5bolts so you don't have to frig around swapping axles etc

If its the GTR 1x6 6bolt (similiar look to the 5bolt but 6bolts, so all spread evenly) then its a definite upgrade as the axles are physically bigger.

The 3.9:1 should be quite nice with it making some decent power.

[bubba]

Yeah it's out of an S13, the 3x2 bolt pattern. So the axles aren't any bigger? looked bigger but I haven't measured and didn't have them side by side with my stock items.

The halfshaft flange bits are a straight swap yeah?

Cheers Cubes

P.S. measured the GT35R up and it isn't going to fit low mount so I've decided to bite the bullet and go high mount and forward facing plenum

[Cubes]

Yeah the half shafts are a straight swap. The real thickness difference is down at the spline on both the half shaft and axle. Generally if the 5bolt axles break they break on the axles spline where it enters the hub.

What manifold are you using?

With the std manifold they can be low mounted and fit fine as well as with custom low mount tubular manifolds.

Plenum, nice exhaust manifold, now just some reground cams (if your running the r32 rb25de) and you'll definitely be looking at close to 400rwkw.

[bubba]

I'll just stick with my standard axles then. Dropping the diff off tonight.. might have it ready to install on the weekend

We did some crude measurements and it really didn't look like it's going to fit.. I was originally going to get a nice tubular low mount manifold but now going to go with an china high mount (got a few mates over here that have had good experiences with particular ones).

400rwkw?!? I don't want that much yet will retain the stock throttle body for now along with the NA cams and cap the power around 400rwhp (still running stock rods..). That should be PLENTY for quite a while, the rest of the setup will be able to pump more but before I go nuts I'll pull the engine out, put a decent set of rods in there and have everything balanced.. then I'll see if she can push 400rwkw

Any idea how much boost it will need to make 400rwhp?

[Cubes]

Standard cams.. 18-20psi; the exhaust manifold may help make the 300rwkw on 18psi or so. Not sure to be honest.

A mate with a GT35r .8, std cams, std exhaust manifold, plenum and 17psi made 270rwkw yet mine on the same dyno roughly same amb conditions made 270rwkw on ~1bar with all stock bits and with a smaller turbo so its really difficult to tell as not all motors are equal.

Another GT35r, std plenum, std exhaust manifold and 260degree cams 18-19psi 300-312rwkw.

Up around 300rwkw the limit is the std exhaust manifold.

It will be good to see what yours pulls with a nice exhaust manifold on it with the rest of the bits being standard.

[bubba]

Oh I'm very interested too!

Dropped the diff bits off yesterday arvo, can't wait for some 2way action!

[STATUS]

S13 6 BOLT DRIVE SHAFTS ARE WEAKER THAN R32 SKYLINE, the first upgrade to any drifter is to remover the 6 bolt driveshafts as they are prone to breaking and cracking.

[Cubes]

URAS,

What is actually weaker about them? Do they run a smaller spline or is the fault with the flange?

[bubba]

Good thing I'm keeping the stockers then, cheers URAS and Cubes