240z RB25det or RB26dett Swap

[DeleriousZ]

sweet dude that looks awesome.

[k3smostwanted]

Originally Posted by FullThrottleHP

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!

well, good luck and keep us posted. if you have any questions, im sure we are all here to try and help get it answered or recommend someone to talk to.

it is pretty crazy that the Japs did that but in other countries, people have a little more concern about keeping their words and being "good" people, unlike the US. alot of places, its about pride and reputation than money...the good guy always comes out on top.

[SR240Z]

for the SR20det into a 240z the transmission tunnel doesnt need to be stretched out and neither does it with the rb25 transmission, if it were a 70-72 240z you would need to shave off the ears inside the tunnel and weld in new ones for the new transmission mount that would need to be made. There is a guy named Rick Wong that makes straight drop in motor mounts for these conversions as well, and our shop also does these swaps but i dont know where you are located. Rb25s ive seen in some 240sxs with almost 500whp and stock internals. Even SR20dets have been held up to 554whp on completely stock block. RB26dett have been seen to hold insane power up north of 800hp+. For the RB25 to fit into the 240z you would also need these parts to clear the front crossmember:
11110-20P00 RB20DET Oil Pan (Rear Sump)
15050-20P03 RB20DET Oil Pickup
15059-V5001 RB20DET Oil Pickup O-Ring

[k3smostwanted]

Originally Posted by SR240Z

for the SR20det into a 240z the transmission tunnel doesnt need to be stretched out and neither does it with the rb25 transmission, if it were a 70-72 240z you would need to shave off the ears inside the tunnel and weld in new ones for the new transmission mount that would need to be made. There is a guy named Rick Wong that makes straight drop in motor mounts for these conversions as well, and our shop also does these swaps but i dont know where you are located. Rb25s ive seen in some 240sxs with almost 500whp and stock internals. Even SR20dets have been held up to 554whp on completely stock block. RB26dett have been seen to hold insane power up north of 800hp+. For the RB25 to fit into the 240z you would also need these parts to clear the front crossmember:
11110-20P00 RB20DET Oil Pan (Rear Sump)
15050-20P03 RB20DET Oil Pickup
15059-V5001 RB20DET Oil Pickup O-Ring

hey, thansk for the info. i must ahve been mistaken about the widening of the tunnels. i thought for sure someone had said the tunnels needed to be widened. have you seen anybody who has swapped in a RB20DET in a 240Z??? seems liek the RB20 would be more of less a straight shot in there...

[DeleriousZ]

hey sr240z, how hard is it to source the sr20det's out of the nissan pulsar GTiR? i've been reading up on them and apparently they've got stronger internals than the other sr20's

[FullThrottleHP]

Sweet, I didn't want to have to make the tunnel larger. Finally someone who has had some experience with this sort of swap; haha. My friend just recently put an sr20det in his 240sx and I need to blow him away next year with my rb! Does anyone know if the Infinity J30 rear end fits a 240z or what rear end with limited slip would?

[SR240Z]

the rb20det into a 240z isnt as hard as it seems, we actually did one as well for a customer who is on this board as Terminal Velocity, here is the link to pics of the swap on our site http://www.vildinimotorsport.com/gallery/mattrb20.html

[SR240Z]

if you are going with either an rb20det or an rb25det i would definitely go with a 4.11 LSD. you can get a r200 4.11 out of the nissan 200sx turbo from 85-87 i believe but they dont come lsd you would need to put an lsd unit into it. i say a 4.11 because those motors in the skyline gts-t came with 4.375 rear ends so the transmission are geared for that rear end, a guy on hybridz.org is running an rb25det with a 3.70 lsd and 3rd gear goes to about 119 mph, good if u want to be a freeway runner but not too quick reving. as far as the pulsar gti-r motors, yes they are stronger internally and have found out recently that they also have individual throttle bodies, they arent really hard to come by i can probably source one out if needed.

[Mr.Molasses]

I have a 1980 280zx, does anyone make a kit to put the vh45de in that?

[DeleriousZ]

i'm sure the 240z kit will either drop right in, or take very little modification to work..

[longlivetheZ]

Originally Posted by K3

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.

Yea...I read an artical about a test they did on a skyline...it's rated at, what, 287 hp from the factory?...something like that. Damn thing dynoed...like...300 or 310 or something AT THE WHEELS. Japan has restrictions on the power their cars can make...to get around this, the makers just lie...I guess...lol

Originally Posted by 1via

I say drop in a VG30DETT....

...or a built VG30ET...like I plan to do... Can we say CHEAP!?

[k3smostwanted]

Originally Posted by longlivetheZ

Yea...I read an artical about a test they did on a skyline...it's rated at, what, 287 hp from the factory?...something like that. Damn thing dynoed...like...300 or 310 or something AT THE WHEELS. Japan has restrictions on the power their cars can make...to get around this, the makers just lie...I guess...lol



...or a built VG30ET...like I plan to do... Can we say CHEAP!?

yep, and i think that myth that the Japanese 300zxTT's have different, smaller turbos is wrong. i will confirm because i have both lying around but i think everything is equal throughout the turbos.

and yes i just read that when Europe received the R34 GTR, it was dynoing well into the 320whp range. thats crazy when it is only supposed to be rated at 280ps which would make it about 230whp. a good ~100whp underrated, not bad.

not that this matters but chevy underrated the LS1 camaros alot too. this was because they didnt want people to know that you can get corvette 1/4 mile and dyno numbers in a car ALOT cheaper, offered by the same company.

[longlivetheZ]

They gotta make their money. Like how the Altima will never be all it can be...don't wanna step on the Maxima's toes...the Maxima will never be all it can be...don't want it interfering with the draw of the 350Z's performance...and so on and so on...

[Nissan-Fan]

Their really arent any engine swaps into this car that are as cut and dry as some have made them out to be... the 2 swaps that would be the most simple would be the Chevy SBC and the L28et, basically any other swap will take a VERY long time unless you have a lot of experience and are able to dedicate 100% of you're time to you're car. Not to mention, engine swaps get very pricey. Go to www.hybridz.org and very soon you will see how long it has taken most of these guys to complete their swaps. (hell, some of them arent even done and have been at it for 2-3 years) Also, if you do get an engine that was only sold in japan, where are you going to buy common replacement parts for it? things will just keep adding up and adding up. But, if you're really confident and have lots of time/money...go for it. But, spend lots of time on Hybridz, and try finding some people in you're area that can maybe offer some hands on help.

[DeleriousZ]

good advice al.. i think that's the part a lot of people overlook in doing any sort of large project... planning is half the battle