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Old 06-15-2005, 12:05 AM   #1
FullThrottleHP
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Question 240z RB25det or RB26dett Swap

Hello and Welcome to my Thread!
Alright, was that a good start...haha, first thread ever for me. But anyways, my story; I bought a 1973 Datsun 240z which is mint condition and I want to make a motor swap this fall. I want something to make it "different" and to blow the doors off other cars. I was decided on a RB25det but I was just curious if anyone else here has done it before? And if so I need to know how it went by chance. I've heard it's a pretty well bolt in situation besides a couple mounts...is this correct? Also before I go too far, I wasn't sure if it was possible to put a RB26dett in a 240z simply? These motors are four-wheel drive and have a different block don't they? Or is this possible? I'm almost sure I will go with a 25 but I was just curious. Thanks for any help!
If I had some pics on the internet I would show you the car which is amazingly clean...maybe sometime soon! I got her for $1600! I think it was a steal, the guy had to move and needed to sell it!!
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Old 06-15-2005, 12:35 AM   #2
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Re: 240z RB25det or RB26dett Swap

well either way, i'm fairly confident that you'll need to fabricate some custom mounts, or try and find someone that makes a swap kit. for it. you'll have to make yourself a custom driveshaft that mounts up from the rb25det transmission. if you're going to swap an rb26dett, you'll need to use an rb25det transmission.

another swap you could think of doing is a vh45de swap... it's a nissan v8 used in the q45 luxury car, and there is a swap kit done up for it (or in the making i'm not sure) done by speedline. (http://speedlinegroup.com/)
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Old 06-15-2005, 05:46 AM   #3
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Re: 240z RB25det or RB26dett Swap

what kind of numbers are being seen from the vh45de?
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Old 06-15-2005, 11:36 AM   #4
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Re: Re: 240z RB25det or RB26dett Swap

Quote:
Originally Posted by redneckshen
what kind of numbers are being seen from the vh45de?
talk to Al for specifics but he says that little over 300hp stock.
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Old 06-15-2005, 08:03 PM   #5
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Re: 240z RB25det or RB26dett Swap

little over 300 stock, with the vk heads, look for around 345, with an intake and a nice exhaust, you're looking at around 400... that's what's been floating around at least
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Old 06-16-2005, 12:42 AM   #6
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I think I would enjoy the turbo better though...The v8 is too much extra metal to put out the same horse power anyways. I also like the idea of having the Skyline motor under my hood, it'll make me feel important. A little more class if you know what I mean.

And I've heard the stock driveshaft will bolt right up for a start...of course I would need a better one in the future. And the motor mounts are no big deal at all neither, that I can do myself.

But if anyone has done this before I need advice!
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Old 06-16-2005, 01:08 AM   #7
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Re: 240z RB25det or RB26dett Swap

sure, having a skyline motor is nice, but having 600whp from a tt v8 is another thing..... if you're looking to build something that will make you soil yourself every time you get on it, then the vh is where it's at... you can either tt it or supercharge it... ask albert (ZGringo) about the potential of it.. it's just insane.

another thing is that the vh45de is probably lighter than the rb25det or 26, as they are both iron Bricks, and the vh is an all aluminum block. just depends if you want finesse and power, or some finesse and INSANE power....
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Old 06-16-2005, 01:26 AM   #8
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Re: Re: Re: 240z RB25det or RB26dett Swap

Just to bust out some FYI:

Quote:
Originally Posted by k3smostwanted
talk to Al for specifics but he says that little over 300hp stock.
02 Q45 was rated 340hp and 333lbs of torque from the factory.
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Old 06-16-2005, 10:57 AM   #9
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Re: Re: Re: Re: 240z RB25det or RB26dett Swap

Quote:
Originally Posted by Broke_as_****
Just to bust out some FYI:



02 Q45 was rated 340hp and 333lbs of torque from the factory.
ehh..thats a little over 300hp for me.
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Old 06-16-2005, 05:54 PM   #10
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Re: Re: Re: Re: Re: 240z RB25det or RB26dett Swap

Quote:
Originally Posted by k3smostwanted
ehh..thats a little over 300hp for me.

Yeah... 345HP or so for the newer Q's and 305HP for the older one's. I'm not sure on the years but the newer ones have the VK45 and the older ones retain the VH45 I'm pretty sure. I'm too lazy to do more research.
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Old 06-16-2005, 07:44 PM   #11
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Well The VH45de puts out 278 hp with 292 lbs. of torque
The RB26dett puts out 280 hp with 260 lbs. of torque
The RB25dett is somewhere's underneath the 26.

I still think I will be going with an RB...
Any past experiences I still ask?

I talked to some people who said that the swap is basically a bolt in. They also say the RB's can run almost 400 hp without needing an internal strengthening. (more like 375hp to be safe)

But anyways I won't be doing many upgrades once I have it in, at least not right away...I can say this now but when it's in I will probably do the opposite..haha
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Old 06-16-2005, 09:35 PM   #12
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Re: 240z RB25det or RB26dett Swap

Quote:
Originally Posted by FullThrottleHP
Well The VH45de puts out 278 hp with 292 lbs. of torque
The RB26dett puts out 280 hp with 260 lbs. of torque
The RB25dett is somewhere's underneath the 26.

I still think I will be going with an RB...
Any past experiences I still ask?

I talked to some people who said that the swap is basically a bolt in. They also say the RB's can run almost 400 hp without needing an internal strengthening. (more like 375hp to be safe)

But anyways I won't be doing many upgrades once I have it in, at least not right away...I can say this now but when it's in I will probably do the opposite..haha
remember that everything in japan was underrated and is in ps not hp. japanese car manufcaturers made a pact not to rate their car over 280ps. so the numbers you see are totally underrated...the RB26DETT have dynoed 270whp so the motor is more like 320-350hp.

anyways, they are no where near bolt-in. i think the drivetrain tunnel needs to be enlarged for the SR it it is really gonna need enlarged for the RB25-26. but yeah...it is an easier swap than most other engines for the 240Z. plus remember you will need to wire the ecu through the firewall...also, im sure the shifter will not come through the floor board so that will need to be customaied somehow. alot of work but if you can do it or afford someone else to do it...it is one hell of a swap.

good luck!!!

oh yeah, RB20DET will probably be your easiest swap and it can handle 350-400whp on stock internals so i know the RB26 can handle atleast 450rwhp on stock internals, thats probably closer to 550bhp. so yeah, very strong motors that love to be modded.
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Old 06-16-2005, 10:33 PM   #13
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Re: 240z RB25det or RB26dett Swap

I say drop in a VG30DETT....
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Old 06-17-2005, 01:36 AM   #14
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I just learned the history about the "pact" today from someone else too. That's so crazy that they would go and rate it 280hp and really the RB26dett puts out like 325hp!! Just to make the Japanese happy... I'm definitly doing an RB, just not sure which one till the time comes this fall. Thanks for the help so far.
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Old 06-17-2005, 01:40 AM   #15
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I just learned the history about the "pact" today from someone else too. That's so crazy that they would go and rate it 280hp and really the RB26dett puts out like 325hp!! Just to make the Japanese happy... I'm definitly doing an RB, just not sure which one till the time comes this fall. Thanks for the help so far.
I got a few pics of the car in my photo gallery!
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