RB20 vs. RB25 trans (56k beware pics**)

[OpeLok]

Posted this on another forum, but I thought I'd share it here too.

Well my friends RB20 transmission took a dump. He/we couldn't locate another one, but we had an RB25 trans layin around. So he decided to use that. So after I took the 20 out I put them side by side just to see what the difference was. Man what a difference! Hahahahha the 25 is so much more "girthy" I guess would be the correct word. Oh well, just thought I'd share some obviousness with everyone

[slow s13]

yeah the rb20 trans is the same family as ka/sr but the 25 has the same transmission fammily as the Z32 so if you blow up the 25 just get a 300zx transmission swap bell housings and your good.

was he able to use it?

[DawgMode]

isnt that a boxer engine in the backround???

[accel junky]

Can everyone confirm that the Rb20's trans has the exact same internals as the KA and SR?

Also how much power can the KA and SR trans typically hold?

[hannibal]

thanks Dawg. I was trying to figure out what kinda motor that was. Definitely a Porsche motor from either a boxster or 911.

How do the lengths compare? Its hard to tell from the pic, but they appear to have the same dimensions; bellhousing to transmission x member looks the same, x member to shifter looks the same, etc.Throw them on a scale if you have access to one...

[SpdElemts]

Looks like a subaru motor to me.

[DawgMode]

IWannaS15,Its not a boxster.....SpdElements was right, its the subarus EJ20

[OpeLok]

IWannaS15,Its not a boxster.....SpdElements was right, its the subarus EJ20

Yup, EJ20 type RA with a lil battle damage. The clip behind it though is complete. Another GC8, type RA

[hannibal]

Oops, my bad. Ive been looking at too many flat fours lately...

So Opelok, got any measurements of the trannies??

[quick_shiftr]

actually subaru engines are reffered to as a "boxster" engine because of the way the pistons are setup..its not referring to a Porsche Boxster, jsut a subaru "boxster" engine

[hannibal]

Both the subaru and the Boxster (combo of BOXer and roadSTER) use a boxer motor.

He was right. He said 'boxer', but I thought Boxster for some reason...