Hopefully this is the first in a weekly series where I do my best to translate articles in Japanese to English. This is mainly for my education. If you have requests, feel free to comment or email me to let me know. Parenthesis generally denote my notes or comments. This article was tough to translate so I’m likely not 100% accurate or paraphrase.
Thank you to Pinku Style for sponsoring this series!
Red Title: Finally TourerV (wassat?) swap kit!
Black Title: SR/RB/JZ Z33 transmission era presentation.
Bold Text: This readily domestically available transmission from (for?) the Tourer V can handle over 500 hp now has a drop in kit. The swap kit for the Z33 transmission to the SR/RB/JZ “big 3” is finally here.
Article on the left: Attacking the clutch. With 1 year of development by Miyaseimitsu for the SR and RB, this swap kit was precision machined. Taking into consideration the drive shaft differences, this north Kantou shop is one of the most trusted in the area.
That Miyaseimitsu company worked hard over that 1 year on more than 10 swaps for this transmission. Aiming for more than just strength and popularity. (next page) Anyone who has tried this 6 speed swap will rave about the big difference in shift feeling.
Picture caption: After swapping my turbo and 6 speed, I was surprised at the difference!
Picture story: After blowing his Chaser’s 5 speed, Satokun asked Wakamatsusan to help swap this transmission in over the summer. With a TD06-25G turbo, good for 450 horsepower, this new transmission helped to get and stay in the power band. And using the stock cross member (??) made him feel much better about the swap. Changing gears makes you just want to hop in and drive. With drifting, the rpms don’t drop the engine out of boost so this increases confidence.
With the suggested 4.1 diff ratio, Nikko circuit , Honshu, and Ebisu south course are doable, problem free. With the 5 speed, it was a 2 to 3 shift. Now with the 6 speed, it’s a 3 to 4 shift. The linear up and down shifting makes it easier to not miss a gear. The shortness of the gear selector took a bit to get used to but it wasn’t long.
Picture caption top: The age of the 6 speed is here! By amigo (why does it say amigo?) Wakamatsusan
Picture caption left: We have a full menu of drop in kits! By Miyaseimitsu Iwasakusan (I think that’s his name)
Text: Amigo Wakamatsusan swapped an R34 trans into his 180sx [SR20XGTRS turbo for 400hp] practice car. “For competitions, you’d want to swap out several final drives but in reality that isn’t often possible. With the 6 speed and a 4.3 diff ratio, most of Kantou’s courses are doable. Nikko, Honshu, Mobara, Ebisu south, and Link are all no problem. Maze might also be doable.” says Wakamatsusan.
This time, Miyaseimitsu set its sights on the 1JZ to swap the TourerV into. Because the manufacturers are the same for the RB/SR, up until now, the drive shaft splines and clutch all matched up. Matching the transmission up to a 1JZ has many more hurdles.
With that Miyaseimitsu looked at an ORC product to help with the pilot bearing in the crankshaft. ORC also provided a proper clutch setup to match the splines of the 6 speed transmission. (No idea what ORC is)
It seems like the JZA80 supra’s getrag transmission is no longer receiving new product support (IE no longer being produced). On the other hand, the Z33 transmission is available for $2,000 and can take more power than the R154 transmission. Miyaseimitsu’s swap kit is $3,000, the dual clutch kit can be found for $600, and a used drive shaft can be found for $100. The grand total for the swap can be about $7,000.
In comparison to the R154, this gives better rear ratio options and a worry free 6 speed transmission. For anyone thinking of a getrag swap, this would be worth thinking about instead.
Top Stats: transmission gear ratios
Bottom stats: Transmission new/used prices (new top, used bottom).
Sidebar Under Trans: Z33/R34 trans. For Silvia/skyline TourerV swaps, in comparison, the R154 has a larger and heavier case. Even the gears are wider apart. Miyaseimitsu says this trans can handle up to 800hp. You can still get them new too. Although be weary of used transmissions having gear (shifting?) issues. Although, for S13s/S14s will need separate speed sensor inputs for the speedometer.
Bottom Graphic: DIY product for swapping this transmission trouble free. Price of trans swap kit, $3,000. Contents: trans case, bell housing. Core swap available. Drive shaft (core swap available). Bell housing adapter. Trans cross member. Shift linkage. Pilot bearing. *Look for the stamp on your JZ engine (no idea what this means).
Bottom Left Graphic: Specialty for the JZ trans swap. Depending on the stamp or type of car, a different shifter cage is necessary. This comes with the $3,000 kit and makes things very simple to swap in.
1 JZ’s clutch cover (bell housing) as is! Different manufacturers transmissions line up with a custom pilot bearing. ORC’s clutch and flywheel match with the transmission’s splines and input shaft. This allows for a trouble free swap.
2 Attach it with an adapter! With the R154’s bellhousing and slave cylinder, there’s no need to swap anything else out. Simply cut the bell housing off the new transmission and use the supplied adapter Miyaseimitsu supplies for an easy swap.
3 It even comes with a trans brace! Since you can’t use the Z33’s transmission mount, this kit comes with a custom brace. The brace also has a provision for exhaust hangers.
4 First class drive shaft! With a different length transmission, a custom drive shaft is necessary. (No idea on the second sentence. Single piece drive shaft maybe?)
5 The TourerV’s drive tunnel is roomier than the Silvia’s but this kit still keeps the transmission above the exhaust.
4.1 Final Drive. With the displacement, torque, and rev limit, the silvia’s wide ranged 4.10 differential ratio is likely best. These were tested at Nikko, Ebisu south with third and 4th gears. Honshu was perfectly in 3rd gear.
Fitting the shifter requires a little trimming on the front drive tunnel. Regardless, the shifter sits roughly in the same spot as factory. Some massaging of the drive tunnel is still needed to fit properly.
1/2 Fixing the Release Bearing. Miyaseimitsu’s silvia kit strives to maintain the factory clutch feel and release bearing. This means that adapters aren’t necessary and everything bolts on without issue. Even the center (drive shaft?) remains stock
3 The TourerV specific transmission bracket can be used. It even has a hanger for the exhaust.
4 Trans tunnel is thinner than(in?) the TourerV. The body’s trans tunnel is narrower but it can be hammered in without the need to cut. Different engine and trans mounts might cause issues with the transmission height so be careful when doing this swap.
5 The R34 transmission is pretty big so its hard to fit and not hang out below the car’s body. This setup has been tested at Ebisu south’s “jump”
For Kantou drifting, 4.3 final gear is best! [Nikkou, Honshu, Mobara, Ebisu south, Link, and Maze are workable but Meihan probably isn’t doable.] Say wakamatsusan. If you wanted to complete up to the hairpin, you might need up to a 4.9.
The shifter hole needs no modifications and the shifter lines up perfectly.
Right side: New R34 trans ~$2,000
Z33 drive shaft and stock SR bellhousing $300
Miyaseimitsu kit $3,000
Be careful of used parts. Make sure to specify and ensure your parts are from/for the right cars before ordering. This kit may also be used for the RB engine in the skyline (??)
Bottom graphic: Shifter location