SATAN

I run the VH45 throttle body on my vg30et. I have not had any issues with boost leaking. Then again, I haven't been under the hood while I am hitting boost either LOL.

If the z31SS was a 30 spline, I wouldn't be screwing around with the Q45 diff, and the swap would be about 100 times easier. All z31 half shafts/input shafts slide into all z31 carriers. All = 29 spline NA/turbo alike, along with VLSD on the shiro special.

Assuming you are talking about the z31 only, then this is incorrect. They both use the 29 spline shaft. The 88ss is just longer to engage the viscous coupling.

Ok, then we are on the same page. I just read it wrong. My apologies sir. Also, for those entertaining the Q45 VLSD from 90-96, you CANNOT plug in your 260z half shafts or any other input shafts except those out of the 90-96 Q45 or the 300zx twin turbo ONLY, as the are both the larger 30 spline input shafts..

Dont know if it has been brought up or not, but the z31 R200 came both 2 pinion and 4 pinion. Only the z31 r200's with the LSD's or VLSD's came with 4 pinions.

Just so you know, you can take your carrier out of your 95 short nose case and put it into your long nose case. This will save you some fabrication on diff mounts and what not. The only thing you have to do is switch ring gears, as the pinion gear is obviously going to be different lengths in long and short nose. Gotta keep them matching.

Do you think you could post up pictures of the half shaft that broke? It is good info to have around. As far as where the weak spots are on certain parts.

Ok, there is STILL a lot of confusion on the short nose R200 differentials. These diffs have been out for a long time and there should NOT be anymore confusion. I am going to post up what I know is 100% fact. If I dont know, I will say. There is already a list of what diffs came in what cars. good info however, it is missing important info. Spline count. This is just going to cover the R200 and the R230's in which I know of. I didn't even know the Armada came with a 230, let alone a larger 230 than the TTZ 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.

Oh, its nothing like you guys. I still have the OEM VG30E in my z31. It had a T66, forged internals, Electromotive stand alone and a bunch of other goodies. I have since upgraded to a GT42r turbo and some other stuff. No V8 action for me. Here are some runs of mine. I am now hoping to get into the 9's this season with some of the other work I have done since then. http://www.youtube.com/satanz31

Do NOT run Motorsport Auto cams. They are done by Schneider cams and are extremely poor quality. I was missing 9* of duration and .030" lift. That is very bad as far as cams go

I know you are asking yourself "Why the hell would you want to do that?" Well, simply because the VLSD sucks. My initial thought was to take the Viscous coupling and just drill some holes in it and plug weld them where the spine section meets the rest of the assembly. Not a good idea in my opinion. To weak. Then I though about it. You have to keep both sides of the viscous coupling spinning at the same time to make it solid. SO.... you take the washer that is in the middle of the viscous coupling and drill/punch it out. Now you can take the longer input shaft and plug it into the opposite side it would normally go in. This way one shaft slides all the way through both sides of the coupling making it a solid piece. Once this is done, you essentially have an open differential now. This is were you weld your gears. The advantage here is that you have 4 of them to weld instead of the 2 that are normally in the open diffs. This will obviously be stronger. The only problem I see with this idea, is that now you are torquing on the input shafts in the opposite direction from which they are used to being torqued. That could lead to premature failure. But those are easy to replace. What do you guys think? Of course this would not be the best idea for street use but....

I ran the long nose R200 with a clsd and the 29 splines and pulled these numbers. My car weighs about 3000lbs and I make somewhere in the neighborhood of 450whp. Your 30 spline should be MORE than enough to hold the power/torque.

Thats awsome! Thats almost identical to all of my times! check it out.

I think you have your terminology mistaken. Either that or I am most likely reading it wrong. Most of your info is good just worded wrong I think. The carrier is the part that actually holds splines and the viscous coupling or the clutch packs. The case is the part that effects the pinion. You cant use a long nose pinion in a short r200 case. You CAN swap out all R200 carriers into another R200 case. I have a Q45 carrier from the short nose case in my long nose case from my z31. Everything fits just fine. You are also correct on the size of the bolts for the older and newer carriers. 10mm vs. 12mm. Maybe this is what you meant to say, I just didn't understand it fully.

Oh sweet Christ. I have to clear up a few things since this is a sticky and is full of a bunch of wrong information. All Z31's (84-89 300zx) came with LONG NOSE R200's Later 87's-89 z31 TURBO'S ONLY ALL came with some form of LSD (Mostly CLSD) ONLY the 88SS z31 came with the R200 Vlsd VERY FEW 88 turbo's are the SS model. ONLY the 90-96 Q45's(some say 89) have the R200VLSD with the beefy 6 bolt input shafts (30 spline) which are the same as the TT's (30 spline), and they ARE NOT twice the size of the 240sx splines which are 29 spline. The 90-96 Q45's carrier (inside parts) will swap over to the 84-89 z31 r200 case. All that is needed is to swap ring gears. But then you have to custom make half shafts. This is where I am at now. 97 q45's do have the R200vlsd but it IS NOT the larger one like the 90-96. ONLY THE 6 BOLTS input shafts are the beefy 30 spline.

Just so you guys know... You are not supposed to bore out a vg30 (87mm) to the 3.3 liter diameter of 91.5mm The water passages are moved outward from the bore on the VG33 blocks. This is to give the block more meat between the cylinder walls and the water passages. Now, is it possible? probably. Will it hold a ton of power? Probably not.

Hey guys, sorry to appear as a noob and then revive and just start posting in your thread however I am curious about the q45 output shafts. Is it only the 1990-1996 q45 that uses the 30 spline? This is why I ask... I have an 88 z31 turbo LSD on my car ok... My plan... Take any year (depending on answers provided) Q45 diff (or just the carrier) put it in/on my car. Take the 5 bolt output shafts AND half shafts from the 1998 q45 (unless these are not 30 spline) and hybrid the half shafts. Mate the half shafts to the z31 turbo 4 bolt axle stub. Now, here is why... I have the Modern Motorsports 31 spline axle stub conversion kit for my z31. If I can hybrid some stuff and mate the q45 output shafts and half shafts to my Modern Motorsport axle stubs, I should have a potent rear end. Oh, and just so you guys know, It doesn't make any sense that the 30 spline output shaft would be just as weak as the smaller R200 output shaft. If you are curious about what the hell I am talking about on the hybriding half shafts and crap like that, look here. http://www.z31performance.com/forum/viewtopic.php?f=3&t=6294