RWD Subaru Boxer Transmission
RWD Subaru Boxer Transmission
(OP)
Okay, I'm pretty sure Subaru never made a RWD transmission for the EJ20 engines. But to get back to the reason I posted this:
I want to put a EJ20 in my soon-to-be heavily modified Datsun 260Z chassis. I've been looking for factory RWD transmissions that could possibly bolt up to the EJs block but as I suspected I haven't found anything. Does anyone here have any ideas on how to mount on to it? Know of a transmission with suitable ratios for the engine?
I'm suspecting I'd have to find a transmission, the kind with a separate bellhousing, and have a custom bellhousing made and possibly get the input shaft machined to fit the pilot bearing. Even then I still don't know what transmissions would have the proper ratios, a 240SX trans might but the pictures I've seen of them the bellhousing was integrated into the case. The only one I've found close so far to might working with the custom and machining idea is the T5 from a 1983 Datsun 280ZX Turbo.
Thank you all for any of the help that's sure to follow.
I want to put a EJ20 in my soon-to-be heavily modified Datsun 260Z chassis. I've been looking for factory RWD transmissions that could possibly bolt up to the EJs block but as I suspected I haven't found anything. Does anyone here have any ideas on how to mount on to it? Know of a transmission with suitable ratios for the engine?
I'm suspecting I'd have to find a transmission, the kind with a separate bellhousing, and have a custom bellhousing made and possibly get the input shaft machined to fit the pilot bearing. Even then I still don't know what transmissions would have the proper ratios, a 240SX trans might but the pictures I've seen of them the bellhousing was integrated into the case. The only one I've found close so far to might working with the custom and machining idea is the T5 from a 1983 Datsun 280ZX Turbo.
Thank you all for any of the help that's sure to follow.





RE: RWD Subaru Boxer Transmission
RE: RWD Subaru Boxer Transmission
RE: RWD Subaru Boxer Transmission
Another solution would be to use a more physically suitable engine gearbox combo.
Regards
Pat
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RE: RWD Subaru Boxer Transmission
Mike Halloran
Pembroke Pines, FL, USA
RE: RWD Subaru Boxer Transmission
An automatic is much easier to hook up, because all you need to do now is get the torque converted bolted to the engine's flex plate or old pressure plate.
With a manual, the trick is now getting the input shaft to work. Since you now have a little more room you might be able to put the pilot bearing into the pressure plate. Obviously you can get the pressure plate redrilled for a clutch that will fit the transmission. Now you just have to figure out how to connect a throw-out bearing.
The manual transmission that came to mind first was a Borg-Warner T-5. They were available in many different cars for many different brands in many different power ratings. There were apparently at least two different bellhousing-to-trans bolt patters. A quick search shows that the ford versions had cable operated clutches.
ISZ
RE: RWD Subaru Boxer Transmission
I tore apart the transmission I blew up hoping that I just needed to replace the bearings for the counter-shaft but when I opened it up I found out that there's no more teeth on any gear (I broke it during a hard down-shift to 3rd around a bend).
What I want to do is maybe have the crank from the EJ machined to accept a pilot bearing for the T5 input shaft. Then hopefully the EJ pressure plate being big enough to fit a 10-spline clutch disk inside of, or find a disk small enough to fit the pressure plate. Use a hydraulic throw-out bearing like from Quarter Master, I think Tilton has them too but not sure. Looking at aftermarket bellhouses I saw that the Lakewood ones are made from 1/4" think steel so I feel like I could fab one myself (with tons of careful measurements because alignment has to be PERFECT) and make sure to leave a recess and a secondary mounting surface for a mini high-torque starter since the starter has to be mounted on the trans side. I don't know if the Subaru starter is hooked into the factory ECU for any given reason, but the engine I want to buy won't be coming with an ECU which is ok with me because I want to do the MegaSquirt route.
RE: RWD Subaru Boxer Transmission
But then, I'm still baffled with why you'd want to put a Subaru engine in a 260Z? Just to be different? Is this really a turbo version of the engine like an EJ257? All the N/A version seem very anemic. Personally, I'd be looking to use someething more along the lines of an all aluminum LS series engine with a T56 bolted to it.
If the transmission has an integrated front cover and bellhousing you can often cut off the bellhousing and install a new one just by using the ring of bolts the hold the front cover on the case. This is often done with auto's when installing a safety rated bellhousing.
RE: RWD Subaru Boxer Transmission
RE: RWD Subaru Boxer Transmission
Look at Formula Ford for gear linkage ideas.
I hope you own a machine shop, metal cutting equipment and a mig or tig welder.
Regards
Pat
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RE: RWD Subaru Boxer Transmission
I would personally worry less about the shifter position and be more concerned with trying to fit the engine between the chassis rails.
RE: RWD Subaru Boxer Transmission
Regards
Pat
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RE: RWD Subaru Boxer Transmission
RE: RWD Subaru Boxer Transmission
I would be checking the bearing spec books for a bearing that has an ID o fit the shaft and an ID to fit the flywheel. If the shaft diameter is so great as to make this unfeasible please RF this post to avoid confusion.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: RWD Subaru Boxer Transmission
Of course Subaru has had their share of transmission failures in may stock cars so they might not be the strongest thing out there.
However that would solve the trans to engine interface issue.
Also, there are surely companies out there that may make upgrades for the weaker stock stuff.
RE: RWD Subaru Boxer Transmission
The rest of it is because they're a clamshell design dating back to vehicles that weighed roughly half as much and had as little as 12% of the horsepower. They're certainly no Audi 016.
The synchronizers don't take well to ham-handed shifting, but I don't think anybody can make one that will. Or rather, there will always be someone out there who can break it.
RE: RWD Subaru Boxer Transmission
The centre diff can be easily replaced with a solid piece of axle.
Pull out the front diff and weld up the exits.
Now the gearbox is rather empty, so you need to fill it up with more oil than standard!
Also, the engine and gearbox are slightly tilted backwards to ensure that there is enough oil reaching the 5th gear.
There are versions with an internal oilpump that bring oil to the back of the box.
The shifter can be modified easily.
check www.sakereurope.com or www.silvermine.nl
they both use Subaru engines with modified standard gearboxes (only these are modified to be a mid engined configuration)