I'm Going To Swap Front Cases From Ka24e To Rb20.....

[frosted flakes]

darn this really sux...guess i will have to buy an rb25det transmission....

[93RPS13]

so wat type of clutch would you use for the hybrid transmission

[PROJECTRB240SX]

The same for any rb.... it still uses the stock flywheel. The Only thing I changed was the rear case and gear set.

[BoostFab]

what's the obvious benefit of using the ka's gear box rather then rb20's? i would assume the r20's is stronger than the one off the ka's

[PROJECTRB240SX]

the only benefit is that if you blow the transmission you wont have to get one from over seas you can pick-up one of the abundant sr/ka trannies and do a front case swap. The rb20/sr/ka trannies are all the same internally none is stronger than the other.

[93RPS13]

yup... i think the S15 6 speed will work with the RB20 http://www.nissaninfiniticlub....ny+KA

i dont know about the mounting tho

[Onizuka]

Who ever said the SR 6 speed is weak needs to come up with some proof. As far as the SR community is concerned, thats just a bunch of internet rubbish. There is a reason not to use the SR 6 speed though, the speed sensor is located in the differential instead of the transmission case. Plus I dont think it will fit on the RB20 bell housing anyways.

[Joe]

from what i understand the 6 speed transmission has a cutout for the speed sensor in a factory location tho, it just uses a cover plate.

kinda like the oil feed holes for the turbo on the non turbo rb25. they are there, just capped.

and i guess im being volunteered for this, altho i was never informed it was a KA transmission in a rb case. i have a perfect KA transmission at home i would have used for this and done it myself.

[PROJECTRB240SX]

If you want my rb20 one thats fine too... let me know either way. I'll have to pull my rb20det transmission from my car though.

[Joe]

check your pm's on az240, i just wanna know what the condition of the KA transmission was before it was put in the rb case.

[PROJECTRB240SX]

It was fully rebuilt thats why I did it.It isn't some used and abused 160k mile transmission. It was rebuilt before it was pulled.

[Joe]

hmm interesting..ok ill guinea pig it just cause ive got time to kill on saturday lol. we gotta get it to me before then, im working 4-close every night except wensday and saturday (obviously)

[PROJECTRB240SX]

I should have it tomorrow for you... we were just waiting for hte activator for the sealer.

[Joe]

still have my work number? just gimme a call if you get it.

[PROJECTRB240SX]

YES AND I WILL DO.

[93RPS13]

if a person can swap a KA transmission to with a SR using the SR bellhousing and have it work, i dont see a problem swapping a S15 6 speed with a RB bellhousing....

[IvoryJ30t]

because theres nothing to be gained. adding a shift doesnt make the car faster, it makes it slower.

the 6th gear is not taller by any appreciable amount to make it worthwhile.

unless you have a huge turbo, and some big cams [270+], swapping in a 6 speed will make the car slower.

[IvoryJ30t]

after the case swap, is the location of the mount moved?

that was the only thing i questioned. i knew the front case would bolt up, but are the bolt holes for the transmission mount in the same place?

[PROJECTRB240SX]

YES, THE HYBRID transmission WILL NOT LINE UP PROPERLY (SITS 1.5" INCHES BACK).... SO I HAVE UPDATES:

WE ARE NOW SWAPPING THE JUST THE KA MAIN SECTION MINUS REAR SHAFT INTO THE RB CASE AND USING THE RB REAR OUTPUT SHAFT. WHICH IS BASICALLY USING KA INTERNALS IN A RB CASE.

ALSO ONE THING YOU NEED TO KNOW WHEN BUILDING THIS HYBRID.... THE RB FRONT CASE HAS A NOTCH THAT NEEDS TO BE GRINDED DOWN TO FIT THE KA CENTERSECTION. THIS NOTCH IS JUST ABOVE THE MIDDLE GUIDE PIN HOLE.

[Wulfgang]

So the mainshafts are a direct swap? What about the countershafts (and 5th gear)? I suppose it doesn't matter much for reverse... never had that one go out on me.

[PROJECTRB240SX]

THERE ARE VERY FEW PARTS THAT ARE THE SAME ACROSS THE TRANNIES.... MAINLY BECAUSE THE RB20 IS A MUCH SMALLER transmission.

THE MAIN SECTIONS CAN BE TRANSFERED BETWEEN THE TWO AS WHOLE UNITS SAVE FOR THE REAR OUTPUT SHAFT THESE BOTH ATTACH IN THE SAME PLACE WITH THE SAME HARDWARE SO YOU CAN SWAP THOSE BETWEEN THE TWO. AS I LEARN MORE I CAN POST MORE BUT THE transmission IS COMING APART AGAIN AND GOING UNDER THE KNIFE FOR MORE MODIFICATIONS.

[Wulfgang]

If you have a digicam I would love to see some comparison pics.

So no synchro or dogteeth swaps?

[PROJECTRB240SX]

IF YOU USE THE KA ONE YOU CAN AS LONG AS YOU RETAIN THE RB20 OUTPUT SHAFT....AS FOR GETTING THE STRAIGHTCUT, SYNCHRO UPGRADES, AND DOG CUT GEAR SWAPS I'M LOOKING INTO IT. I'LL PROBABLY SEE IN US GEARS OR OS GIKEN CAN BUILD A CUSTOM SETUP..... ALSO I'M LOOKING INTO THE GREX SR/KA SEQUENTIAL transmission UPGRADES.

I REALLY NEED TO GO OUT AND BUY A CAMERA AND MAKE PICTURE DOCUMENTATION OF EVERYTHING.... I'LL SEE IF I CAN GET AHOLD OF ONE EFORE IT ALL GOES BACK TOGETHER.

[im two techno]

i know that the Mazda miata 6 speed and Rx-8 both have the same trans as the S15. i wonder if they line up?

[PROJECTRB240SX]

If internally they are the same I could probably swap casings to get it to work, if they are the same generation of transmissions as the rb20 series.... if they are larger possibly the rb25 trans cases will work.

[sil8tdrifter]

Very interesting, rock on projectrb240sx. my question is, Is it still cost effective for the average joe with all the modifications that need be performed as comparison with the cost of a Rb tran?And am I correct in my understanding that the gearing between the Ka and Rb are the same??

[PROJECTRB240SX]

YES AND YES.... AS LONG AS YOU CAN VISUALLY REMEMBER WHERE EVERY PART YOU TAKE OFF GOES IT SHOULD ONLY COST YOU THE AMOUNT OF A KA TRANS, SOME GASKETS, AND SOME ANEROBIC SEALANT.