z_cars_rule Posted December 6, 2005 Author Share Posted December 6, 2005 One more thing, you cant go past the wide aftermarket support for an RB over here, where as the only thing i could buy for a L28 performance wise was a 2nd hand cam. Quote Link to comment Share on other sites More sharing options...
Sparks280zt Posted December 6, 2005 Share Posted December 6, 2005 yea makes good sense, im sure you can make some power with the 20 Quote Link to comment Share on other sites More sharing options...
olie05 Posted December 6, 2005 Share Posted December 6, 2005 so if the RB20DET fits into the 280zx that easily, why not the Z? Just wondering... Edit: my understanding (now) is that everything should bolt into the Z with the shorter rb20 transmission and z31 mounts, correct? -Oliver Quote Link to comment Share on other sites More sharing options...
stony Posted December 6, 2005 Share Posted December 6, 2005 It fits fine in the Z. I had a rb25 bolted into mine before the rb26 but the motor had spun bearing in it so i didnt use it and went with a rb26. Quote Link to comment Share on other sites More sharing options...
Gollum Posted December 6, 2005 Share Posted December 6, 2005 So correct me if I'm wrong, the RB25 and the RB20 use the same mounts correct? Or at least have the same mount setup on the block? I know there was a guy who did a RB25 in a ZX so i'm gonna go search for his posts again. Quote Link to comment Share on other sites More sharing options...
z_cars_rule Posted December 7, 2005 Author Share Posted December 7, 2005 so if the RB20DET fits into the 280zx that easily' date=' why not the Z? Just wondering... Edit: my understanding (now) is that everything should bolt into the Z with the shorter rb20 transmission and z31 mounts, correct? -Oliver[/quote'] I didnt use the 200ZR mounts, i used the skyline mounts. the only thing i used was the 200ZR sump and oil pickup. I would imagine that it should all bolt up to the Z, thing i am not sure about would be the gearbox mount. Quote Link to comment Share on other sites More sharing options...
Guest ON3GO Posted December 7, 2005 Share Posted December 7, 2005 well ill find out more info on the rb20 and 25 engine mounts as my engine supplier has both in stock. and i have a 280ZX i can use as a project car for it.... damnit not another fricken car!!!!!!!!!!!!!!!!!!!! mike Quote Link to comment Share on other sites More sharing options...
z_cars_rule Posted December 7, 2005 Author Share Posted December 7, 2005 hahaha, i was wondering if i would have this effect on people. if you want to know something mike just ask away Quote Link to comment Share on other sites More sharing options...
z_cars_rule Posted December 11, 2005 Author Share Posted December 11, 2005 At the moment i am having problems hooking up the power steering of all things, then it should be getting the exhaust done in 3 days time, then next week off to the workshop to get the ECU wired and tuned. Quote Link to comment Share on other sites More sharing options...
z_cars_rule Posted December 13, 2005 Author Share Posted December 13, 2005 well it looks like I am going to have to wait until the end of January to finish her and get on the road. My tuner has said that he is now too busy to do my work and i dont trust anyone else with the work. This just gives me a chance to clean up then engine bay with new hoses etc. Quote Link to comment Share on other sites More sharing options...
240Z_Master Posted December 14, 2005 Share Posted December 14, 2005 You'll be fine man.... don't worry. Good work takes time. Quote Link to comment Share on other sites More sharing options...
z_cars_rule Posted December 17, 2005 Author Share Posted December 17, 2005 soon i will have pics of the intercooler and exhaust set up Quote Link to comment Share on other sites More sharing options...
z_cars_rule Posted February 13, 2006 Author Share Posted February 13, 2006 The car runs!!! I ended up using an EMS 8860 for the ECU. Running stock boost i pulled 221 rwhp (in shootout mode, so no 'fake' numbers can be produced.) the thing has instant boost, i have not got a working tacho at the moment so i cannot go all out, just play it by ear. I beat a 2005 WRX STi from 80 - 160 kmh, pulled atleast 2 car lengths. when i get some gauges working i will post up a video of it. Quote Link to comment Share on other sites More sharing options...
RB26powered74zcar Posted February 13, 2006 Share Posted February 13, 2006 Good news.... hope to see some pics of that bad boy! Quote Link to comment Share on other sites More sharing options...
EMWHYR0HEN Posted February 13, 2006 Share Posted February 13, 2006 I beleive the RB20DET and RB25DE have the same motor mounts, and also bolt right up to the early and late model Z's. I also know that the DE and 20DET trannys are exacly the same. I just finished my RB25DE swap into my 71'. everything bolted right up, even the drive shaft. AS Far as weight issues, I weighed the RB25DE before i dropped it on and Got: tranny - 95 lbs -dry engine - 406 lbs (without clutch flywheel and tranny brackets) clutch, starter, and tranny brackets - 25 lbs Flywheel - 18 lbs <----- haha what a joke total weight about 554 lbs with oils. Maybe 40-60 lbs heavier than the L28 i think. also, the Rb measures around 1/2 inch shorter on the backside of the engine compared to the L28, however, the Rb sits in the exact same place the L28 does on the front. but, thats using the stock mounts that is. As far as handling issues, i think it doesnt change it at all. maybe even compensated the weight for my 6 pt. roll cage! Hood clearence Driver side mount Passenger side mount. Front clearence Rear Clearence exhaust clearence Quote Link to comment Share on other sites More sharing options...
Ed260Z Posted February 13, 2006 Share Posted February 13, 2006 looks like a real nice & clean install. I hope mine comes out well, but I'm still worried about the wiring. Quote Link to comment Share on other sites More sharing options...
z_cars_rule Posted February 14, 2006 Author Share Posted February 14, 2006 very nice EMWHYR0HEN, I was originally going to go with the 25DE, but for the same money i got a 20DET. Have you got any dyno numbers or 1/4 times? Also, does anyone have an approximate 1/4 time for me, i am currently using some very sticky 235/65/14s on the back. Quote Link to comment Share on other sites More sharing options...
Stealth-Z Posted February 14, 2006 Share Posted February 14, 2006 I recently found the pictures of the trial fit of an RB20 in my 78 Fairlady Z. Measurements from the stock R32 Skyline mounts to the transmission mounts were the same as the original L motor. The L series transmission mount bolted right up. The Automatic drive shaft splines slid into the RB20 5-speed with no problems. However, I never did try to bolt up the drive shaft. img/ http://www.fairladyzg.comimagesrb20trialfit1.jpg />img img/ http://www.fairladyzg.comimagesrb20trialfit2.jpg />img My preference is to move the engine back a few inches. Perhaps everything would have bolted up and worked with no custom work. The shifter obviously would have been further forward. The Z is now completely awaiting reassembly with an RB30/26DETT combo. Had this bright idea of completely stripping it down, new paint, weather strip, bushings etc. Quote Link to comment Share on other sites More sharing options...
DatZun Driver Posted February 14, 2006 Share Posted February 14, 2006 Man thats cool guys. I'm gettin my RB25DET front clip on thurs. Another 280ZX with a RB in the works. Thanks for the info guys. Quote Link to comment Share on other sites More sharing options...
EMWHYR0HEN Posted February 14, 2006 Share Posted February 14, 2006 Nope, no dyno #'s or official 1/4 mile times yet. I have the stock top half of the header, but i had a muffler shop make the lower half of it and he used 1 inch piping on it and made some horable flowing collector to join in with my exhisting 2.5 inch exhaust. I have to post a picture of it its just plain funny to see an inline six with such skinny piping. so i know im losing alot of power there, currently searching for a good free flowing header. even still with a horable exhaust flow, the RB25DE still has a good midrage torque and a clean linear pull to redline (7000 RPM). however, im running an r200 with 3.5 gears and im not happy with the gearing match with the rb25de tranny. my 2nd gear max's around 65-70, which is just too high for me becuase I 'm trying to make the car achive good roadrace chararteristics. would anyone suggest a 3.9 rear end or 4.11 for my set up? anyway, the way my car is right now which is: 71 240Z RB25DE Cold air intake 2.5 inch header back w/ borla 3.5 R200 195/50/14's 6 pt cage I G-teched it on a backroad and ran a 14.4 @ 91 mph not so impressive, but my new 27mpg is! Heres a recent picture I took on an Angeles Crest run. Quote Link to comment Share on other sites More sharing options...
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