My RB25DET--> Z31 project

Post by **Dramier** » Mon Oct 23, 2006 9:47 am

Awesome job so far Racin'... It is looking much better than mine already... I really wish I had had the mechanical knowledge to do my own like you are doing and document it like you have.

Keep up the great work!

I have been hellaciously busy working, it's tough starting off at the bottom in the automotive technician field.. Haven't hardly been able to touch my car at all, and it needs oil, plugs and a crapload of other stuff. I do have the Blazt software in and the consult connectors, so I'm looking forward to checking that out.

Enjoy the Ride!

Post by **Blackbob** » Mon Oct 23, 2006 1:48 pm

Dramier wrote:Awesome job so far Racin'... It is looking much better than mine already... I really wish I had had the mechanical knowledge to do my own like you are doing and document it like you have.

Keep up the great work!

I have been hellaciously busy working, it's tough starting off at the bottom in the automotive technician field.. Haven't hardly been able to touch my car at all, and it needs oil, plugs and a crapload of other stuff. I do have the Blazt software in and the consult connectors, so I'm looking forward to checking that out.

Enjoy the Ride!

Now is this blazt stuff kinda like crome for hondas or what because I ave never heard of it. Being looking into doing an RB swap myself this thread along with some random information I have found online is helping as much as I am willing to read. BTW awsome thread Racinjitter your thread helpin ALOT ! I'll be sure to share it with my Z31 brotherin.

~BB~

Post by **Racinjitter** » Mon Oct 23, 2006 3:21 pm

Not a prob guys, I am doing this mainly to show that it doesnt really take that much to make it work well in a Z31. But I have tons of documentation for my final writeup that will go into the website that I will be building for future reference.

Dramier let me know how the blatz software works out for you. I would also like to know how easy it is for you to tune.

Blatz is a editing program for the EEPROM in the newer Z's and RB engines. Well actually it will work on almost all nissans from the early 90's on. Just like NisTune. http://www.blazt.biz/index.html. The next update I should have the Driveshaft in and will prep for removal and final installation.

Post by **Dramier** » Wed Nov 15, 2006 3:22 pm

Well, finally got around to playing with that consult port and the software I have...

No luck getting it working. I'm not sure if the problem is the consult connector or laptop drivers... My swap's ECU had the consult connector removed, so I had to add it back. I'm 99% the wiring is right, but so far I haven't had any luck getting the laptop to see the ECU with any software.

If you still have the consult connector wired into your ECU, can you confirm which pins it is on?

I wish I knew somebody local with a Z32 or a 240SX I could test it on. Bleh.

Post by **evildky** » Thu Nov 16, 2006 8:16 am

wht not a stand alone? I am sure you can find a local nissan to test your consult

Post by **Motegi** » Thu Nov 16, 2006 5:16 pm

Sweet.

Post by **Dramier** » Sat Nov 18, 2006 12:36 pm

evildky wrote:wht not a stand alone? I am sure you can find a local nissan to test your consult

Yeah but with me working at the Nissan's sister Honda dealership, they close when I get off work... lol.

It's all gravy anyway, because I GOT IT WORKING! Woo hoo! Turns out my IGN wire running from the ECU was only putting out 4.5V for some reason, swapped to a different 12V source and it connected and works flawlessly.

I haven't played too much with it yet, ran out of daylight after work today, but from the little I have seen..... I can't say enough how useful of a troubleshooting tool this stuff is. I mean no joke if you have an RB and you aren't using some kind of PC->Consult package you are shooting yourself in the foot. Just being able to compare the specs from the ECU's sensors to the FSM is a huge advantage. Instead of swapping and buying crap to see if it's working, you just compare numbers. 100x easier and much more like it's done in modern dealerships anyway.

I did a quick cold idle datalog, and played with turning some cylinders off and generally monitoring some different settings, and I've already learned a few things. Like I said, if you haven't gotten an aftermarket ECU or some kind of consult monitoring setup, do yourself a favor and get one now.

I went with Blazt.biz's USB Consult cable and Nissan Datascan 1.51, and I have no complaints, and their customer support has been truly amazing. I also played with Conzult, ECU-Talk, Nissan OBD Scan, and CalumSult, all of which connected to the ECU without trouble and were able to monitor some to all functions. Tecu however, I could not get to work. It also looks like I can dump the ROM relatively easily, and I bet a custom flashed chip wouldn't be that difficult to handle, or even a piggy back system.

But anyway, add my name to the list of impressed users of Blazt.

Post by **Racinjitter** » Sat Nov 25, 2006 5:23 pm

Thats awesome Dramier, I have the wires for consult, But I need to buy the connector.

Sorry it has been so long for an update but I have been very busy with the house weddings and wiring. So I got rid of the greddy fmic for a brand new treadstone/spearco fmic. The main reason for getting rid of the greddy is because it was used, and I sold it for way more that I paid for it. Next I swapped the auto pedals for a clutch and small brake pedal. This took all together like 20 minutes, very easy to change over. I am on final mock up and am removing the engine transmission tomarrow to do all of the final welding. Then I put her all together and start the power steering mock up and remote oil filter and cooler. I will be sending the car out then for the FMIC piping and then she should be running. Pics

Updates should be coming more often now, Likely every weekend.

Post by **evildky** » Sat Nov 25, 2006 8:42 pm

Nicew I.C same one I'm running on my 240Z, much more efficient than the crossflow POS I had before, and the vertical takes a lot of piping out for those of us with non crossflow inline engines, why not swap to the log style intake?

Post by **Racinjitter** » Sat Nov 25, 2006 9:28 pm

I dont plan on the greddy intake until I have the gt35r on and am maxing out its potential. The factory intake flows really well, but at around 400 whp it starts to choke the engine. So basically I am not too worried about it until the end of next summer. next winter is the expected time for me to put the rb30 in.

Post by **evildky** » Sun Nov 26, 2006 6:00 pm

I just hate the over the cams intake, and the logstyle opens up shorter piping paths using crossflow I/C with less bends

when I was monkeying with the turbofords I rotated and pie sliced the upper intake to accomplish the same thing

Post by **Racinjitter** » Tue Nov 28, 2006 4:04 pm

evildky wrote:I just hate the over the cams intake, and the logstyle opens up shorter piping paths using crossflow I/C with less bends

I feel the same way. I just figured that right now it isnt worth putting on until I have her running at least. Here is a couple pics of the modified crossmember. Right now it is just tacked together, tomarrow I should have it done.

Post by **Racinjitter** » Sun Dec 10, 2006 4:35 pm

Sorry for not updating sooner, I have a lot to do in the next few weeks. well, the crossmember is finished, and I got a slew of new parts. I got the turbo calipers, hubs, rotors, new rack, new tie rods, new rack bushings and a few other things. I will be ordering Jason's poly mounts very soon also. Unfortunately I wont be able to use the transmission mount that he makes. I also made an interesting discovery about the shortage of turbo calipers. The 1995 infinity J30 calipers and mounts will bolt up and have larger pistons by 1/4" each.

Well here are some pics.

Post by **WidebodyZ** » Fri Dec 22, 2006 6:45 pm

There's a far easier way to do this swap, but seeing how you've gone all out I guess it doesn't matter. Haha. The RB20 crossmember can be used from the Z31's in Japan that came stock with them. Guys do RB26 swaps quite frequently. Nice project though.

Post by **Racinjitter** » Sat Dec 23, 2006 8:49 am

You are correct, However I did find a 200zr crossmember for $600. It is too easy to modify this one for free. Also the engine brackets are NLA for a 200zr, I didnt even try to source those after the sticker shock from the crossmember. The rb26dett only fits if you have a single turbo, or right hand drive.

Post by **Racinjitter** » Wed Jan 17, 2007 7:28 pm

Well I have been looking for the 10mm fittings for the slave master for 2 weeks now and I am at my witts end, no auto parts stores carry the ones I need. I have had a parts guru looking with me, to no sucess. But I finished the crossmember and installed the new rack, rack bushings and tie rods. Once I get the fully treaded 10mm line nuts I can final install the rb and get her running.

Pics...

And the pooch decided its his turn to drive...

Post by **Racinjitter** » Tue Jan 23, 2007 4:10 pm

OK i got back to work on the car today, but didnt get much done. I found the 10mm line nuts that I needed at the local dealership. So I then made the new clutch line from the master directly to the flex line on the slave.

Pic...

Tomarrow I plan on setting the engine for the final time along with the transmission. Updates will come regularly and more frequently in the next few weeks.

Post by **Racinjitter** » Fri Mar 09, 2007 5:35 pm

I final mounted the RB last weekend, and installed the new poly mounts thanks to Jason @ Z31parts. I also installed a unsprung Nismo clutch disc and heavy duty pressure plate. I got a new vertical mount radiator and electric fans to install later. I also bought some new wheels and tires. Rears are 18x10 et 22 with yokohama AVS sports 275/35R18 and fronts 18x9 et 24 and I am thinking of going with either falken azenis 245/40R18 or cooper 2XS, not too sure yet, right now the fronts have 275/35R18 toyo proxes T1-S and fit perfect. I will probably have to roll the rear fenders a little to be sure that I dont cut a tire. Anyhow pics....

Post by **Racinjitter** » Sat Mar 17, 2007 9:46 am

So I got to work on the car and mocked up the radiator and fmic. I am sure that the radiator will be moved more forward and the fmic will be moved wherever. I also located the oil filter block and am waiting for the cooler. The drive shaft with out the rear flange measures 25 3/8" which is being made this week. I plan on wiring up the car tomarrow, but who knows what else I will get done.

Pics...

Post by **nizmo_dryfta** » Sat Apr 21, 2007 9:05 am

any updates??

Post by **WidebodyZ** » Sun Apr 22, 2007 3:39 am

Coming along. Nice use of the propane tank..haha.

Post by **Racinjitter** » Tue May 01, 2007 4:52 pm

WidebodyZ wrote:Coming along. Nice use of the propane tank..haha.

Close... Its a 30lb R-12 can, it seemed to be the right height.

There is an update, But not much of one...

Did a little work this past weekend on the car. I put the driveshaft in, put the transmission mount in, installed the full wiring harness, hooked up the oil cooler and a few other odds and ends. I have the engine cranking, but right now there is no spark. Looking into that very soon.

So far I dont think that the driveline angle is perfect, so I will fab up a new transmission mount. But the angle it is at right now is acceptable for test runs, and initial shakedowns.

Post by **Racinjitter** » Wed May 02, 2007 2:46 pm

Do you ever get that feeling that you have just conquered the world when it is just a small task? That is how I felt when this happened...

That was the first startup of my rb25det in the 88 300zx.

Now its time to get it back together... :twisted:

2nd Startup...

Post by **evildky** » Wed May 02, 2007 7:56 pm

congrats, I know the feeling, especailly after being uo all night tracking down some seemingly simple roblem

Post by **Misuzu** » Fri May 04, 2007 2:53 pm

If you had a chance to get at a junkyard in japan for 200zr parts or something of that nature, is there anything that would of made this swap a lot easier?

Post by **Racinjitter** » Fri May 04, 2007 9:49 pm

Misuzu wrote:If you had a chance to get at a junkyard in japan for 200zr parts or something of that nature, is there anything that would of made this swap a lot easier?

Ummm yes. But shipping will cost an arm and your first born. So I guess if you have no fabrication skill you could buy the crossmember and engine brackets, to make it bolt in. But then you will still have to fabricate other stuff, as the 200zr is rhd.

Post by **Racinjitter** » Fri May 18, 2007 5:32 pm

Well I drove the car today, It feels ok = needs more boost. Right now I have the boost set at a steady 8psi, but creeps to about 10 under WOT while the VCT is working. I couldnt get the tach working however. Which sucks but oh well. I think I will be upgrading the car most of the summer with little things. The butt dyno reads about 250-300whp. I will get a baseling soon to see exactly what it is. The engine pulls hard through all the gears. The complete exhaust and IC pipes cost me $320. The IC pipes are stainless and the turbo back is aluminized. I have the magnaflow 14834 stainless muffler mounted out back.

The bad; I need to take the transmission apart and measure the end play for 5th gear, under power it makes noise. No biggie parts are readily available and easy to get ahold of.

Pics and exhaust clip.

Post by **Razi** » Fri May 18, 2007 8:09 pm

Daaaaaang

Post by **MoparMan** » Mon May 21, 2007 11:40 am

Great job!

Post by **ogrb240** » Tue Nov 02, 2010 4:15 pm

just want to thank you first off this post is helping out alot!!!! im doing the exact same swap except it came manual, but i do have some questions about parts and wiring.
where can i get the drive shaft?
where can i get the transmission mount?
what where the dimensions on the plates for the motor mounts & did you have to cut the cross member at all before you welded the plates to the cross member?
if you had to do any re-wiring cause i havent looked at the wiring harness, what did you have to do and do you have a a wiring diagram?
if their is anything else that i should know about this swap please let me know.

thanks!!!!!!!!

My RB25DET--> Z31 project

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