The 90-96 Q45 comes with a VLSD. I'm 99% sure the twin turbo Z also comes with a VLSD.
Now why are these two differentials so important? Because they are both have 30 spline input shafts, the R230 is splines are bigger diameter, (see post #14 below). Both are the desirable ones for making bigger power levels. When I say bigger, I mean like 700+ ft/lbs torque. That is big to some but not to others, so... This is a ball park on what they are good for. This ball park has HUGE variables though. If you launch your car and get nothing but wheel hop all over the place, no diff on the planet is going to like you. Generally it is not torque that breaks diffs, or ANY drive train parts for that matter(Yes there's exceptions). IT IS DRIVE LINE SHOCK that jacks things up. You do clutch drop after clutch drop, parts dont like you. You get wheel hop, parts dont like you. When you hear "Clunk" after doing something... that is bad. Respect your drive train and your drive train will respect you.
Now, back to the topic at hand. There are some misconceptions that need to be cleared up. The NON TURBO z32 DID NOT come with the R230. IT DOES NOT have the 6 bolt output flanges. It DOES have the same 5 bolt output flanges that most of the short nose R200's use. These come in the Infinity J30, the N/A z32 and later Q45's (97-02)) and as far as I know the 240sx (not as familiar with the 240sx). THESE ARE ALL 29 SPLINE!!!! Yes the 240sx as well, that I do know. The N/A z32 and the 97-02 Q45 DO come with a VLSD, again, it just has the smaller 29 spline with the 5 bolt output shaft. Only some of the 240sx's came with the VLSD, but I cant tell you which ones. As far as I know, any R200 that comes with some form of LSD is 4 pinion. Any open R200 is going to have 2 pinion. Again this is just as far as I know. I know for FACT that the 90-02 Q45 all use 4 pinion. I know for FACT that ALL z32's use 4 pinion.
NOW, the 2003 and on q45 (F50) comes with the six bolt equally spaced output flange also BUT I cannot tell you what spline count it has. I would assume it is also 30 spline but I have not pulled one to actually count it. It doesn't really matter though because of the following information that I KNOW is FACT.
The F50 Q45 diffs are NOT any kind of LSD. Not VLSD and not CLSD. They are an open diff. On top of that, they are only 2 pinion instead of the 4 pinion. Thats not good for anybody. Take that for what you will.
The reason I know this information is because of extensive internet searching. I kept coming across info that said one thing only to find someone else saying something else. The info I stated to be FACT can be backed up with pictures and FSM details.
Here is a picture of the NON TURBO z32 input shafts VS. the 90-96 Infinity Q45 input shafts. Notice the 5 bolt vs the 6 bolt also. also notice the diameter of the shafts, 29.8mm VS. 30.7mm. I came up with slightly different numbers but over all, it is 1mm difference. I got this picture from nismogab on z31performance.com
Here is what you will see if you look in the Q45 FSM's
90-96 Infinity Q45 R200 short nose. Notice the 4 pinions and 6 bolt along with the viscous coupling, Just like the Twin turbo z32's
97-02 Infinity Q45 R200 short nose. Notice the 4 pinion, but only 5 bolt, along with the viscous coupling, Just like the NA z32's
03- dont know how late Infinity Q45 R200 short nose. Notice the two pinion WITH NO viscous coupling! WEAK SAUCE!
I think that is about all I have to say about that.
Edited by BRAAP, 10 July 2010 - 08:38 AM.
Added edit for Q R200 vs R230 output shaft.