[Let us kill the rb26 mated to rb25 tranny questions.]

This is the setup I currently have. I wish I had that taller 5th of the z32 tranny. As for the other gears?? I wish they were a bit shorter when I am on drag radials, otherwise it doesn't matter. I can spin 3rd gear from a roll without too much trouble. However, it would be nice to have shorter gears for launching at the track.

 

Evan

 

Is this setup in your s30 or s14?

[Let us kill the rb26 mated to rb25 tranny questions.]

Thanks Bud,

 

Thanks for clearing a lot of things up. I know that there's a lot of this information on the net and this is an old subject, but all the information I've found were conflicting with no solid answers.

 

If you'd like some answers, list them below and I will only answer if I am 100% sure I am giving you correct information.

 

From what I read above, there's still a hell of a lot of missinformation or you guys sure like doing things the hard way, lol.

 

Here's a couple of basic's for ya..........

 

If you want a 2wd transmission for RB20,25,26,30 in a S13,S14,S15,A31,C33,C34,R32,R33,R34,240z,260z etc and you want something that can cope with up to 600hp pretty easy, go with a stock R33 RB25det box, it bolts straight up to the motor, uses the same starter etc etc.

 

Then................use a RB20 or 25 flywheel (any model, and there are no pull type RB25 flywheel/clutches as far as I am aware)....or R32 RB26 flywheel as they all take normal push type clutches, just be sure you get the flywheel that takes a 9 1/2 in clutch and it has 9 bolts holding the clutch cover on (some RB20s had a 9 in flywheel and a 6 bolt cover)

 

Then............use a normal push type R32 release bearing or whatever bearing suits the clutch you get.

 

Its so simple its not funny, why mess around with a VG30dett box???

 

If you have any other specific questions, go for it.

 

Rob

 

There's also another member who started a separate post after I did about using the n/a 300zx clutch:

 

http://forums.hybridz.org/showthread.php?t=141802

 

The answer is yes. You can can us the n/a z32 with the rb26/rb25 tranny setup. It will bolt right up to the rb flywheels.

[Let us kill the rb26 mated to rb25 tranny questions.]

If I recall correctly, haven't you tried the z31t tranny with your rb in your s30 (read it somewhere in nico)? How does the z31t tranny shifter align up to the s30 shifter hole?

 

On another thought. The z31t tranny seems to have taller gearing from gears 1-3 and a shorter fifth gear when compared to z32 and rb25 transmissions. I'm have no clue when it comes to gearing, but would this mean better acceleration (for dragging) in the first three gears, while having a higher top speed in fifth or do I have that reversed? I believe fourth gear on all the trannies are 1:1. Here are the gear ratios that I found for the FS5R30A, 1988-89 z31t transmission:

 

1st - 3.324

2nd - 2.077

3rd - 1.360

4th - 1.000

5th - 0.711

 

(info sourced from http://www.az-zbum.com/information.transmission.shtml)

 

Most of the guys that buy a rb26 motor set, end up with a awd box that they can use the bell housing off of, so it's just a matter of coming up with a z32 box to mate to.

 

Or better yet, find a z31T (88-89) and use that with the front bell from the awd. No shifter dramas that way...

 

rb25 guys usually get the correct rb25det box with their motor set, so they are good to go.

 

I know this is old, repeated info I just posted. I just wanted to put it all in one place again for those searching.

 

 

j.

[Let us kill the rb26 mated to rb25 tranny questions.]

Or when using a RB20/25/26/30 why not just use a R33 RB25det tranny, a RB26 flywheel and push type clutch and save yourself a hell of alot of trouble, all bolts straight up without mixing parts.

 

Rob

 

Sure, but you didn't mention which clutch rb25, rb26, or n/a 300zx?

 

It's easier said than it is to actually source some of these parts together. Here in the U.S., rb parts are not common and are quite expensive.

 

I would like this post to be something that helps people who can't readily get "ready-to-go" swap parts that are already pieced together or for someone looking to replace a clutch or flywheel or any of the other parts. Also I've found that a lot of the info I came across on the internet is very vague as if people don't want to share their knowledge but just hints at it. No offense, but comments like "get a push clutch type" just brings up more questions. A comment such as "a push clutch type from a n/a Z32 or Rb25" would be more helpful. I started this post to clear up all the conflicting information floating around the net so I would like the answers to be specific here if possible.

[Let us kill the rb26 mated to rb25 tranny questions.]

First off, I've done my research... here, google, nico, zilvia, freshalloy, and so on...so let's end the questions and myths about using these tranny combinations. These are more confirmation and/or clarification questions.

 

Please correct or confirm me on these questions:

 

The rb26 and rb25 bell housing can be mated with any Z32 transmission (since both turbo and n/a are identical internally) without changing the input shaft to compensate for the difference in rb and z32 bell housing length. Although recommended, it is not necessary since the shorter z32 input will still work when mated to an rb motor. Yes?

 

However, this setup will not fit into a S30 chasis without modifying the shifter hole/area and/or the shifter itself since the Z32 shifter is a "linkage style" type shifter and the lengths are different. Yes?

 

You can also mate the rb bell housing to a Z31 transmission also (and the z31 has the same type of shifter and length as the rb25 tranny). Yes?

 

All sr, ka, and rb shifters are interchangable. Yes?

 

When mating the rb26 motor to the rb25 tranny, you can use any flywheel made for a rb20, rb25, or rb26 motor? Clutches that you can use with this setup are any n/a Z32 or rb25 clutch regardless of flywheel. Yes?

 

Rb26 and rb25 starters are interchangable and works with any of the flywheels mentioned. Yes?

 

Rb26 and turbo Z32 clutches will not fit the rb25 tranny because they are 250 (something) and the rb25 and n/a Z32 measure only 240 (something), but you can notch and grind the interior of the rb25 bell housing to use the larger 250 (something) clutches. Yes?

 

Rb26, rb20, and rb25 clutch pilot bearings (the one inside the engine) are the same. Yes?

 

You must use the matching clutch release bearing (the one mounted on the clutch fork) for the clutch being used (i.e...rb25 bearing for rb25 clutch and n/a z32 bearing for n/a z32 clutch). Yes?

 

Parts needed for pull to push clutch conversion include:

Rb26 (or Rb25) bell housing

Z32 front cover

Z32 throw out arm

Z32 throw out bearing

Z32 pivot ball

front cover gasket

slave cylinder.

Yes? (Taken from http://www.nicoclub.com/articles.php?id=288581)

 

For push type rb25 trannys, you can use a z32 slave cylinder as a replacement.Yes?

 

RB tranny sensors can be swapped out for a Z32 speed sensor for correct MPH reading. Yes?

 

 

Please add anything else I missed or omitted.

[Nagasaki Jdm Motors‏]

I did an ebay search for search by seller for "motor time", 0 results.

 

lookup "motor time" on ebay they send back emails in about 20-30 minutes, then they will respond every 5 minutes, plus they have some really good deals., as well as cheap shipping with there own trucks, so they can offload in residential area's!

 

sales@motortime.biz

[Nagasaki Jdm Motors‏]

I checked that forum before posting here. I was a former 240sx / sr20det geek before moving onto better things, the s30.

 

I cant find it anymore.

 

Here is a link to NicoClub.com about engine set/clip sellers.

http://forums.nicoclub.com/zerothread?id=115184

 

Maybe a Mod will know of the one here and make it a sticky one day but the Nicoclub one is more extensive. It also needs to be made a sticky.

[Nagasaki Jdm Motors‏]

I'm about to purchase a RB26 motor set from these guys, Nagasaki Jdm Motors‏. I've haven't had time to call them yet, every time I have called, which is after work after 5 pm, they were always closed. We've been emailing back and forth, but they take almost a week to reply to each email. Has anyone had experience with them yet? They seem legit going by their site. Here is their site:

 

http://www.nagasakijdmmotors.com/catalog/index.php

 

 

Mods: If I post this in the wrong forum, please move it please. Thanks.

[R33 rb26dett clip pricing...]

Yes, the clip is in the states. It's about a two hour drive, but I can go and see the clip. Is there a way for me to start or at least crank the clip so that I can get a compression reading? I have a compression guage, the type where you screw it into the spark plug. I was thinking of dropping a bit or oil down the spark plug acces into the cylinder and then cranking it with a battery. Of course I'm sure there isn't a key so any ideas here? I don't want to bad-mouth anyone, so all I will say is the clip is from an importer in the northern half of California. The compression was done using a "leak-down" test. I'm not sure what that is, but I'm assuming you pump air into the cylinder(s) and test for leaks, so yes, alexidways, I think the compression was done with dry cylinders. What is the compression suppose to be anyways. Thanks.

[R33 rb26dett clip pricing...]

I know I will get :fmad:flamed:flamedevi, but did a search and couldn't find much usuable info. I'm just wondering if the price on this clip is reasonable(a good deal) or not.

 

I ran across a deal on a complete r33 rb26dett front clip for $3800 with included vlsd with axles, driveshaft, 5 lug conversion, and guage cluster. The motor has 40-45K on it and has been leaked down tested at 165 across. Clip is complete with uncut harness, ecu, mafs(x2), intercooler and pipings also.

 

Any thought are greatly appreciated. Thanks.