Anyone in here have an A/T RB25 in their car?

[AZhitman]

Tell me a little about it - What's it in? How's the power? Any issues?

[rotorimp]

We may be the first to try it?????????

[Joe]

like i told greg, ive never seen it 100% successfully completed.

[Carl H]

start with an AT car, then use the ka's trans control unit to control the trans, simple as that.

[Joe]

the KA TCU will control a RB25 auto trans? they kinda arent nearly the same size so im assuming the internals are pretty different.

[Carl H]

same basic concepts really...you wont have the power and econ button as std in the r32/33 but it should still work iirc the r32 auto trans is identical to the ka in the s13.gimme a car and a motorset and i'll make it work in 2 weeks or less.also size does not matter (bleh to sexual inuendo) its still a 4spd nissan auto box...

[S14-NEO]

another thing to think about and im not sure if anyone has thought of this but the KA auto trans is huge in comparison to the KA manual..wonder if this is the same as a RB...if thats the case GOOD LUCK getting it to fit in the transmission tunnel for the manual fits barely as is. speaking in regards to the RB25 manual and not the RB20 (teeny tiny) unit. haha sorry RB20 owners.

[incite316]

same basic concepts really...you wont have the power and econ button as std in the r32/33 but it should still work iirc the r32 auto trans is identical to the ka in the s13.gimme a car and a motorset and i'll make it work in 2 weeks or less.also size does not matter (bleh to sexual inuendo) its still a 4spd nissan auto box...

So has anyone try this method yet?

[the_momo]

if someone wants the ka trans (if i read what carl said correctly?) i have a dohc auto i would donate for free. im in michigan.

[Bronze MFP]

too good to shift our own gears now are we?

[Carl H]

ugh dont use the ka trans use the rb one.

[incite316]

So does anyone know if the RB25 auto harness is the same as a KA24. Other then it's missing the power/snow button.
Modified by incite316 at 7:10 PM 1/6/2007

[Carl H]

the power and econ button are nothing more than a switch for the tcu, the harness colours might be diffrent but it will operate off of the same principal.

[FAST-DATSUN]

We are just finishing one. You will have to do some minor cutting to the front of the trans crossmember body mount area and shorten our trans mount to one bolt hole (rear) on each side, but it fits. custom linkage for the shifter, we swapped KA wiring on the trans so everthing plugged in.shorten the front driveshaft section to fit(S14) everthing else except wiring was the same. wiring mods to keep the auto computer working. Mack@Mckinney Motorsports.

[incite316]

We are just finishing one. You will have to do some minor cutting to the front of the trans crossmember body mount area and shorten our trans mount to one bolt hole (rear) on each side, but it fits. custom linkage for the shifter, we swapped KA wiring on the trans so everthing plugged in.shorten the front driveshaft section to fit(S14) everthing else except wiring was the same. wiring mods to keep the auto computer working. Mack@Mckinney Motorsports.

So are you using the KA transmission ,TCU and harness or the skyline transmission, tcu and harness for the wiring?

[Carl H]

its simple like i said before...use the rb auto trans, ka auto harness and connect ka wiring for the tcu and such to the rb harness...very easy if you are smart with wiring.like mack said gotta mod the mount brackets, driveshaft and shift linkage but i didnt really count that as major mods.

[FAST-DATSUN]

skyline trans with the KA wiring...

[rbforsale]

i have done this mod exactly and have had nothing but problems,in fact my trans computer cought on fire like 2 weeks ago now im out of a car trying to convert to manual and cant cause i dont know if a ka trans will bolt up cause i cant find a GOD DAMN RB MANUAL TRANS ANYWHERE!!!!

sorry im just a little frustrated right now cause i havnt had any luck and nothing but problems with the whole swap from the get go

[Carl H]

wow then something is seriously effed up in your wiring man, because that SHOULDNT happen at all.

[FAST-DATSUN]

just use the RB20DET trans it good enough for the street daily driver..

[FL_97_GTS25t_4DR]

I have an A/T in my car. It's bone stock, so I don't know any differently. The power and acceleration are good and it shifts very smoothly. The only issue I have is how it powerslides like a mofo if you don't let go of the gas when turning a corner. Not a bad thing in people's opinion, but this is a daily driver not a drifting/racing machine. It was awfully scary the few couple of days when I was driving around Tokyo. Now it's just good to be different.

[incite316]

So has anyone got their's to work yet?

[Bluefire]

I will be doing an auto within a few weeks... It won't be in a 240, but I should be able to break down the auto wiring system so everyone can understand, and do the swap in whatever chassis

-Bluefire

[jdmser]

Which auto trans are you using and from what year? I was looking into autos and it looked like the Z32 and R33 auto are the same. That would be awesome because of all the support the 300zx auto haas over here with torque converter, clutch and band kits, valve bodies, and controllers.

[roadrunr]

I'm doing the wiring on mine right now, its a 93-240 vert with a RB25DET Auto going in. It looks like all the wiring from the RB transmission will plug into the KA plugs by the battery, but I haven't chased all the wires yet, matter of fact thats what I'm doing now, tring to find a schematic on the RB to see whats what, and I'm not having any luck. Even if I want to put the KA transmission harness on the RB transmission, I still need a schematic to see what wires go to what in case the colors are different, but if their all the same, then it looks like everything from the RB will plug right in where the KA stuff use to be. Anyone know where I can find these wiring diagrams? Every site I have gone to so far only has the RB engine manual and there's no schematics in there.

[incite316]

question: Does anyone know if the 240sx has to be a automatic from the beginning. Because my was a standard. (Like does the automatic version more sensor then manual, etc...)

I already bought an automatic R33 front clip. I'll using a PCS controller (http://www.powertraincontrolsolutions.c ... ent-4.html) and The Shrifter (http://www.twistmachine.com).

But the first person I hired destory the wiring. So my question is can I use the harness from an KA or VQ (can't seem to found anyplace willing to sell an complete automatic harness with ECU)?

[matafied]

What about an adapter kit? then you can run a built chevy th350 bulletproof

http://www.atiperformanceprodu...t.htm

just a thought

[RBvipVert]

I'll be starting mine in a month or so. I have heard so many mixed things about this swap. I have a 94 vert and I have all the stuff minus the ECU and transmission control module from the skyline. Those 2 peices should be here in a few days. I'll try to document my swap so there will be some good info here in the future.

[blues14]

I tried this in my s14 with an auto rb20.........long story short, its now a 5-speed cuz nobody I took it to could get the transmission to shift properly. The best it got was every gear worked perfect except it would hold onto second gear too long, so i had to push hold, and then release it right away and it would drop into 3rd any time from second gear......whacky stuff...... good luck

[jdmser]

I was reading some threads about automatic a while back and saw something about the 300zx automatic shifting slow from second to third. The Q45 guys swap in the 300zxtt autos for the different gears. Seems the slow 2-3 shift can be fixed by unplugging or replacing a resistor. Me, I'd like to find a R34 4 speed auto with lock-up in all four gears and sequential shifting.