RB FAQ

[Tenchuu]

www.racebread.com check under their USDM parts interface section. too many cross referenced parts to list in one post.

[s13coupedrfter]

Here's a helpful s13/ka24 - r33/rb25det wiring conversion I found. Just click "proceed".
http://racebread.com/old/Documents/harness.swf

[ANVIL]

Originally Posted by TheSnail

rb25 valves are the same as vg30dett valves.

Originally Posted by bardabe

VG30DETT and VG30DE valves are the same. as well as cams, timing belt, thermostat, Head and Head gasket.

and some where else I read that z32 coilpacks work on rb25's? (if they do its not bolt on)

im 99% sure those are false

MODS - this thread could really use some cleaning up. Maybe deleted and started over with all FACTS instead of people arguing and people's assumtions.

[bardabe]

Originally Posted by ANVIL

and some where else I read that z32 coilpacks work on rb25's? (if they do its not bolt on)

im 99% sure those are false

MODS - this thread could really use some cleaning up. Maybe deleted and started over with all FACTS instead of people arguing and people's assumtions.

Z32 coilpacks aren't a bolt on to any RB, however word of mouth is Q45's work i have personally not tried it so no assurance on that but i KNOW Z32 wudn't work. im looking at one right now.

the VG30 and VG30DETT are practically the same engines with the following 2 exceptions:

the VG30DETT has Oil squirters, Forged Pistons, taped oil lines, and oil return bungs on the oil pan, and 370cc injectors.

the VG30DE has non of the above. but ha sa 10:1 compression ratio with 270cc injectors. everything else on these motors is pretty much the same / identical.

[ANVIL]

when I was in the market for rb25 valves, I measured both with an micrometer and they were different.

[ECR33S14]

Early model Q45 coil packs will work on a series 1 RB25 but you have to change the"boot" (i guess thats what youd call it?). the series 2 shares the same coil packs as the RB26 and nothing else.

[kouki_s14]

Originally Posted by ECR33S14

Early model Q45 coil packs will work on a series 1 RB25 but you have to change the"boot" (i guess thats what youd call it?). the series 2 shares the same coil packs as the RB26 and nothing else.

Series 2 shares coil packs with the R34 RB26 ONLY

RB25DET Series 2 and R34 RB26DETT have ignitors built into the coilpacks.

RB25DET Series 1 and R33/R32 RB26DETT have external ignitors.

[lost_generation]

quick question, if i were to buy a rb20det front cut, could i use all the manual parts to convert a sohc auto to a 5 speed, or do i have to find usdm parts(expl the driveshafts) i'm just not sure if the master cyl, pedals and shit would work

[240love]

i doubt they will work....

[kouki_s14]

Originally Posted by lost_generation

quick question, if i were to buy a rb20det front cut, could i use all the manual parts to convert a sohc auto to a 5 speed, or do i have to find usdm parts(expl the driveshafts) i'm just not sure if the master cyl, pedals and shit would work

RB stuff wont work

Just buy new stuff, i tried to used junkyard parts, they all eventually failed so i bought all new stuff and it has been great since.

[racer98]

Question: isnt thre a way use the Getrag 6-speed set from the R34 GTR.

Meaning , use the Rb25det trasmission casing and use the 6-speed box and bolt it up to the Rb25 casing ? ............. Eliminating the awd componet on the back of the R34 GTR box ?

[joshls2]

I'm a noob(first post) and i have a question as well. can u mate an s14 or s15 SR20 motor with a KAauto' tranny?

if so, what sort of replacment parts must i have like(replacing the ECU or fule pump) to make it all work.

[racer98]

Originally Posted by joshls2

I'm a noob(first post) and i have a question as well. can u mate an s14 or s15 SR20 motor with a KAauto' tranny?

if so, what sort of replacment parts must i have like(replacing the ECU or fule pump) to make it all work.

Um, what thread is this ? its related to RB motors and parts not SR's GTFO.

[joshls2]

Well actually thats what i wanted to knowin the firstplace, but i asked the wrong question, sorry.. I heard some where that the bell housing of the RB25 matches that of the z32 tranny. or was it just the clutch?..hmmm.

but yah, are you able to mate a RB25 to a 300zx auto-tranny? thanx.

[racer98]

Originally Posted by joshls2

Well actually thats what i wanted to knowin the firstplace, but i asked the wrong question, sorry.. I heard some where that the bell housing of the RB25 matches that of the z32 tranny. or was it just the clutch?..hmmm.

but yah, are you able to mate a RB25 to a 300zx auto-tranny? thanx.

Huh?, you're in the wrong section.

[joshls2]

''Huh?" no im not. dose any one else know, please.

[racer98]

Originally Posted by joshls2

''Huh?" no im not. dose any one else know, please.

each year of auto are diffferent, you will have to try each one for your own and figure it out. good luck.

[96Turbo]

Originally Posted by joshls2

Well actually thats what i wanted to knowin the firstplace, but i asked the wrong question, sorry.. I heard some where that the bell housing of the RB25 matches that of the z32 tranny. or was it just the clutch?..hmmm.

but yah, are you able to mate a RB25 to a 300zx auto-tranny? thanx.

Just the clutch as far as i know

[joshls2]

well what about mated with a 240 auto? reson why i'm asking is because i'm ready to get a rb25 but i want it to be auto. (faster shifting)

[deep in silvia]

What other alternator are combatable on the series I rb25det?

[racer98]

Originally Posted by joshls2

well what about mated with a 240 auto? reson why i'm asking is because i'm ready to get a rb25 but i want it to be auto. (faster shifting)

might want to play with gear ratio charts before you start taking something apart.

[racer98]

Originally Posted by deep in silvia

What other alternator are combatable on the series I rb25det?

I have one but can you post a photo of yours, this is a completet long shot.

93 KA24 but swap the pulley.

[racer98]

What would be intresting to do with the R34 GTR transmission. (Getrag 6)

Unbolt te AWD transfercase and use the bell & housing case on a Rb25 box for a 6speed 2wd set up.

or figure out a cost effective sequential 6-speed box. Cost effective under $10K.

[deep in silvia]

What other alternator are combatable on the series I rb25det?

[cashed240]

i posted in the tech section as well but i really need help, rb20 in a coupe and floods out and revs super slow til bout 2500 then back down, smells like raw fuel, i am using a z32 maf because thats all i had and OSAKA didnt send one w the swap, now i realize that its not right for the ecu but i swapped w a ka sohc maf and ther is no change at all(di that just to see if it would make any difference) as a matter of fact it runs the same w the maf unplugged so i am confused and dont know where to look. it idles fine once it starts just the other issues. i have heard that the temp sensor might be bad?????? any ideas would be greatly appreciated. also do i need to ck coils and how?

[racer98]

Originally Posted by cashed240

i posted in the tech section as well but i really need help, rb20 in a coupe and floods out and revs super slow til bout 2500 then back down, smells like raw fuel, i am using a z32 maf because thats all i had and OSAKA didnt send one w the swap, now i realize that its not right for the ecu but i swapped w a ka sohc maf and ther is no change at all(di that just to see if it would make any difference) as a matter of fact it runs the same w the maf unplugged so i am confused and dont know where to look. it idles fine once it starts just the other issues. i have heard that the temp sensor might be bad?????? any ideas would be greatly appreciated. also do i need to ck coils and how?

you are going to have to go over every thing with an ohms tester, would have been better if they would stop doing this chicken shit. I dont like to read stuff like this. Really bothers me.


you have a orange lable Maf and you need the green lable one that is for the Rb20DET, now you are going to have to check

-IAC
-Injectors.
-essentially rip a part the whole electrical system.
-also check your ecu and so on

[racer98]

Originally Posted by deep in silvia

What other alternator are combatable on the series I rb25det?

did you try one ? from the KA and swap out the pulley ?

[Tenchuu]

*****RB25DET SPARK PLUG INFO*****

most people suggest the BKR5E-11 re-gapped to .8mm. the -11 with factory gap runs like shit.

the BKR5E is gapped at .8mm already, and therefore is a drop in replacement

For iridium (and i highly suggest it, just switched mine over to these, go with a BKR5EIX. since you can't re gap iridium, that one is also gapped .8, where the BKR5EIX-11 that most people suggest is too big of gap once again.


i hope this helps weed out some false info i have found on the web, i found all this out by having changed my spark plugs a total of 11 times over the last 4 months seeing who was correct on heat range and gaps. and i can say that the iridium, 5 HR .8mm gap ones are noticeably better.

[Ptclaus98]

I was just wondering, where'd the FAQ go?

[racer20]

So which one is hard to swap an rb25 or the rb26. I am thinking of doing this swap down the road.