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Looking to swap in a RB25DET into my 240z


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#1 musickraver

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Posted 28 March 2010 - 04:42 PM

I suppose I'll start off my introducing myself. My name is Travis, I am new to hybridz and datsun z's although my father and uncle own a few. So I just recently bought a 240z from someone in the neighborhood and it doesn't run. It needs some carburetor work and a few other things that its missing so rather than fixing it up, I was thinking I could just go ahead with a rb25 swap. My uncle has a 240z that has a v8 conversion as well as a rb20 conversion, so he told me it wouldn’t be too difficult to swap out an rb25 with a 5 speed tranny into it. Now I've never really done any work on a z before but my paps and my uncle said they’d help me out as much as possible.

Could you guys give me some information on how to go about this? How much it’ll cost and if it’s a straight swap, or would I have to do various other things along with it. Any information, etc would be absolutely amazing and it seems like everyone here is really cool, seems like a great community here.

Could I just do something like purchasing this rb25 for example: RB25. Or is that a bad choice? Like I said, I'm new to the z world and could use all the help and support I can get. Thanks a lot.

Travis
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#2 DREW RBZ

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Posted 28 March 2010 - 04:49 PM

I suppose I'll start off my introducing myself. My name is Travis, I am new to hybridz and datsun z's although my father and uncle own a few. So I just recently bought a 240z from someone in the neighborhood and it doesn't run. It needs some carburetor work and a few other things that its missing so rather than fixing it up, I was thinking I could just go ahead with a rb25 swap. My uncle has a 240z that has a v8 conversion as well as a rb20 conversion, so he told me it wouldn’t be too difficult to swap out an rb25 with a 5 speed tranny into it. Now I've never really done any work on a z before but my paps and my uncle said they’d help me out as much as possible.

Could you guys give me some information on how to go about this? How much it’ll cost and if it’s a straight swap, or would I have to do various other things along with it. Any information, etc would be absolutely amazing and it seems like everyone here is really cool, seems like a great community here.

Could I just do something like purchasing this rb25 for example: RB25. Or is that a bad choice? Like I said, I'm new to the z world and could use all the help and support I can get. Thanks a lot.

Travis



Travis...welcome to the board. There is a ton of information here regarding the questions you ask about this swap. I would highly suggest that you search through and read as much as you can then ask questions that you may not have an answer to. Here is a direct link to the RB section here at Hybridz.org. This will answer many of your questions.

http://forums.hybrid...issan-rb-forum/
1972 240z, BAMF wide flares. RB26DETT ported/polished w HKS step 2 cams, Gt2860r-5's ,300zxtt 5spd,WCR Cv axles,Nismo twin plate clutch, LSD,porsche 996 brakes front, 944 turbo rears, coilovers, illuminas, meth injection, 540RWHP @17psi:flamedevi

#3 CarJway

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Posted 28 March 2010 - 04:50 PM

Welcome to HybridZ... Since this is your first post, I will be nice...

There is a entire sticky on this topic.
click me

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#4 pat1

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Posted 28 March 2010 - 04:56 PM

there is a ton of info on the rb part on this forum. The swap is pretty straight forward. I did a rb20 swap in my 280z and I found it easy. I decided on the rb20 because of the cost. I have seen the rb20's produce about 400hp and that more than enough for my datsun. I have about 1500.00-1800.00 in my swap before I added everything like a bigger turbo,injectors and NIStune and etc. Thats 1500.00-1800 with it running and driving. I added everything else after the swap. The only part thats a pain to find is the rear sump oil pan which nissan does not make anymore. Thats where I can help you. I have been build custom rear sump pans for the rb swaps for the s30's (see my posts on the rb engine part on this forum) Please let me know if you have any questions about this swaps. I would be glad to answer any questions.
I'm still building the RB 20,25 and 26 rear sump oil pans.

For the S30,S130 and the Z31 swap. PM me for details.

#5 musickraver

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Posted 28 March 2010 - 09:19 PM

Thanks a lot for your input guys, and I have been doing some research here on the forums before I actually posted but I just couldn't find the sufficient information. Perhaps I'm just blind or I don't know how to read. Nevertheless, I have found some great information on the rb forums (thank you carjway) although I'm still lost. I know I'm going to be in need of some motor mounts, just don't know where to go about getting one. Also, I'm afraid the wiring is going to be a pain in the ***. Any additional information, or perhaps you guys can lead me in the correct direction would be plenty helpful.


pat1:
The swap is pretty straight forward. I did a rb20 swap in my 280z and I found it easy. I decided on the rb20 because of the cost.

Would you say the swap would be easier with a rb20 rather than the rb25. I'm definitely into conserving as much cash as possible and I'm not looking for intense hp, just a reasonable amount, 300hp would be the most I would ask for. Thanks.
Travis M. Roche
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#6 pat1

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Posted 29 March 2010 - 04:52 AM

The rb20 would be easier. I used the stock skyline motor mounts and modified the stock z trans crossmember to use the rb trans mount. With the rb20 you can use the stock z driveshaft. The wiring is cake. It's less than 10 wires plus gauges. The rb25 is the same but you need motor mounts that run 475.00 from Mckenney motorsports or you can make your own. You have to get a driveshaft made which is about 250-400. The wiring is also easy. Tuning is easier with the rb20 vs the rb25. With the rb25 you can't use the stock rb25 ecu. You have to use a rb20 or z32 ECM.


All and all the rb20 is a little easier and cheaper. It's how much power you want. My rb20 is perfect for me. It hauls a$$. And revs to the moon.
I'm still building the RB 20,25 and 26 rear sump oil pans.

For the S30,S130 and the Z31 swap. PM me for details.

#7 wrcbonk

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Posted 29 March 2010 - 06:42 AM

I am in the midst of doing an RB25 swap myself. Read all the stickies at the top of the Nissan RB Forum. Chris Rummel provided an incredible wiring write up. I am most likely going to use the McKinney Motorsports products for my engine and trans mounts. I purchased by motor from Venus-Auto in Sacramento.
Series 1 RB25DET swap rolling under its own power in my S30
http://i814.photobuc...et/P1010083.jpg

#8 musickraver

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Posted 29 March 2010 - 08:00 PM

The rb20 would be easier. I used the stock skyline motor mounts and modified the stock z trans crossmember to use the rb trans mount. With the rb20 you can use the stock z driveshaft. The wiring is cake. It's less than 10 wires plus gauges. The rb25 is the same but you need motor mounts that run 475.00 from Mckenney motorsports or you can make your own. You have to get a driveshaft made which is about 250-400. The wiring is also easy. Tuning is easier with the rb20 vs the rb25. With the rb25 you can't use the stock rb25 ecu. You have to use a rb20 or z32 ECM.


All and all the rb20 is a little easier and cheaper. It's how much power you want. My rb20 is perfect for me. It hauls a$$. And revs to the moon.


What did you do modify the z crossmember in order to use the rb trans mount if you don't mind me asking? If you could help me out here, I'm going to be putting in the order for the engine and tranny most likely by the end of this week/end.

It comes with the following:
Engine Block Top and Bottom
Intake Manifold
Turbo Manifold
Turbo
5 Speed rear wheel drive Transmission
A/C Compressor
Alternator
Starter
Power steering pump
Valve Cover
OEM Sensors
IGNITER
SPARK PLUG
COIL PACK
Oil Pan
Complete wiring harness to the ECU!

Is there anything missing from the engine or would this be about everything in order to get this bad boy running again? Thanks pat. And I'll probably be sending you a pm soon about your sump pan, saw your thread, looks good.
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#9 pat1

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Posted 30 March 2010 - 04:13 AM

You will need a intercooler and piping, get a walbro inline fuel pump. As far as the crossmember goes I modified it by drilling two holes in it and grinding down the sides a bit so the z crossmember will fit right on. I had to slot the stock engine crossmember forward about 1/4 inch and the motor and trans dropped right in.
I'm still building the RB 20,25 and 26 rear sump oil pans.

For the S30,S130 and the Z31 swap. PM me for details.

#10 musickraver

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Posted 30 March 2010 - 08:34 PM

You will need a intercooler and piping, get a walbro inline fuel pump. As far as the crossmember goes I modified it by drilling two holes in it and grinding down the sides a bit so the z crossmember will fit right on. I had to slot the stock engine crossmember forward about 1/4 inch and the motor and trans dropped right in.


Right, well besides the intercooler and piping and of course the walbro inline fuel pump, is there anything I need or perhaps I'm missing? Any other modifications to the z itself I would have to go through. Perhaps, I would need to upgrade the suspension as well as disk breaks for the rear correct? Or is that not really a necessity for the rb engine? I know that you need it for sure on a v8 conversion, but its not like I'm going to have that crazy amount of hp and I'm definitely not racing it.
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#11 pat1

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Posted 31 March 2010 - 09:43 AM

Off the top of my head it sounds like you have everything. I would put a new timing belt, tensioner,idler pulley and a water pump. And a t-stat. I have coilovers on my car with heavier springs. I put the Toyota 4 piston calipers and the bigger master cylinder. I still have the stock rear brakes. The brakes work great for the street.
I'm still building the RB 20,25 and 26 rear sump oil pans.

For the S30,S130 and the Z31 swap. PM me for details.

#12 musickraver

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Posted 31 March 2010 - 04:32 PM

Off the top of my head it sounds like you have everything. I would put a new timing belt, tensioner,idler pulley and a water pump. And a t-stat. I have coilovers on my car with heavier springs. I put the Toyota 4 piston calipers and the bigger master cylinder. I still have the stock rear brakes. The brakes work great for the street.

Pat, I greatly appreciate all of your help, couldn't have asked for more. You'll be one of the first I credit for my build. :cheers:

Also, if anyone can point me to an awesome store for guages, speedo, boost, oil, water temp, etc.
Travis M. Roche
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#13 pat1

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Posted 31 March 2010 - 04:39 PM

I have always bought my gauges from summitracing.com. They have good prices and fast shipping. Sometimes you can find coupons on the net for them also.. Just google summit racing coupons.
I'm still building the RB 20,25 and 26 rear sump oil pans.

For the S30,S130 and the Z31 swap. PM me for details.

#14 musickraver

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Posted 01 April 2010 - 05:31 PM

I have always bought my gauges from summitracing.com. They have good prices and fast shipping. Sometimes you can find coupons on the net for them also.. Just google summit racing coupons.


awesome man, thanks a lot.
Travis M. Roche
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www.travisroche.com

#15 erehemantresni

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Posted 02 April 2010 - 05:30 AM

Why can't you use the stock rb25 ecu? I have put a couple rb25s in 240sx's and never had an issue.

#16 pat1

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Posted 02 April 2010 - 01:38 PM

Why can't you use the stock rb25 ecu? I have put a couple rb25s in 240sx's and never had an issue.



you can't tune them. something with the eprom.
I'm still building the RB 20,25 and 26 rear sump oil pans.

For the S30,S130 and the Z31 swap. PM me for details.

#17 jake

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Posted 08 May 2010 - 09:00 PM

there is a ton of info on the rb part on this forum. The swap is pretty straight forward. I did a rb20 swap in my 280z and I found it easy. I decided on the rb20 because of the cost. I have seen the rb20's produce about 400hp and that more than enough for my datsun. I have about 1500.00-1800.00 in my swap before I added everything like a bigger turbo,injectors and NIStune and etc. Thats 1500.00-1800 with it running and driving. I added everything else after the swap. The only part thats a pain to find is the rear sump oil pan which nissan does not make anymore. Thats where I can help you. I have been build custom rear sump pans for the rb swaps for the s30's (see my posts on the rb engine part on this forum) Please let me know if you have any questions about this swaps. I would be glad to answer any questions.

hey how much does a modified oil pan run im starting a rb25 swap on my datsun i could use all the help i can get. thx,jake

#18 doublez

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Posted 09 May 2010 - 01:14 PM

hey how much does a modified oil pan run im starting a rb25 swap on my datsun i could use all the help i can get. thx,jake



You should be reading in the RB subforum to find out more if you are going to be doing this swap, but I'll start you off with a link to pats thread. He lists prices a couple posts down, you just have to look for it...
http://forums.hybrid...these-oil-pans/

RB Subforum

#19 pat1

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Posted 09 May 2010 - 03:48 PM

I'll be glad to build you one. Do you have a rear wheel drive block or a all wheel drive block? The difference between the two is that the rear wheel drive block comes with a steel pan and the all wheel drive block comes with a aluminum pan. Most of the rb25's come rwd and I can build that pan three ways.

1: I can modify your stock pan to make it a rear sump pan that pan runs 250.00 plus shipping. I will need your pan and pick up as a core.

2: I can use your stock pan and I cut off the flange and build a custom pan from the flange up. this one runs 400.00 plus shipping. I will need your stock pan as a core.

3: I can build one from the ground up 100% from scratch. This one does not require a core or a pickup this one runs 475.00



If you have a all wheel drive block I can only make it one way that is 100% from scratch and this one runs 595.00 plus shipping. There is alot more metal work on these pans.



please let me know. I have some stock rb ft sump pans in stock and I can start the work asap. No waiting for your cores to show up. If you have any questions please let me know. I'll be glad to help you out
I'm still building the RB 20,25 and 26 rear sump oil pans.

For the S30,S130 and the Z31 swap. PM me for details.

#20 ComicArtist

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Posted 10 May 2010 - 05:44 AM

It looks like you've got it under control. I wish I had an uncle who knew how to swap an RB20. If I was that fortunate I'd have an RB in my car.

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