hello everyone a newb to the 240 crowd, have a few Q

[scottsi]

now now i know most of you are seeing this topic and are like "damnit another stupid noob asking stupid questions" so i'll refrain from all the idiotic questions and ask only the ones i feel are important.

first a bit of background on my, i used to work on hondas but that was boring as hell and turboing them and making 250 hp and just spinng the tires was getting old quick.

So i decided to get a 1990 nissan 300zx twin turbo, i did every modification to it besides change out injectors to bigger ones. ran a 12.7 @ 111mph, then it was hit and murdered

bought another 1991 300zx tt, did the dp/tp/catback/ clutch/ flywheel/ pulley, intake, boost controller and attempted a injector swap but venom injectors are CRAP and gave me nothing but hell.

So that is my background, and if anyone has worked on the z32s, they know how difficult a clutch change on jackstands can be, or how difficult the injectors are to change out.

Now my last Z was stolen and luckily i had full coverage, so its time for a new project, i have decided upon a s13 and plan on swapping in a rb25deti plan on this swap because it is a 2.5l engine therefore it will make a good ammount of torque, also being straight 6 versus the V of the vg30, from what ive researched the bottom end can take 500+hp, and doing the math, 500hp and 2800lbs = FAST

My plans are for a turbo upgrade, injector upgrade, and a intercooler upgrade. along with the necessary, downpipe which i will fabricate, and intake and such.

Now with the questions, can i run a z32 ecu on the rb26? because i ran Zcontrol on my last Z and it let me alter the eprom chips feul and timing maps according to how big my injectors are and the a/f ratio.

If that isnt possible, what types of tuning are there? from cheapest to expensive, besides a safc which i really dislike. something along the lines of a eprom feul/timing writing program. Also, do people switch from MAF to MAP? i am seeing turbos where the intake of the turbo is sucking from the atomosphere instead of through a MAF, or is the MAF located inline of the charge piping?

I've researched the rb25 swap aswell, and it does not look too difficult to bolt in. the part that worries me is the wiring, should i buy a clip and swap everything over? or should i buy a swap with all the wiring? how difficult is the wiring and what are some gremlins to watch out for?

I think that is everything that i can come up with now, if anyone can help me out it would be greatly appreciated, thanks alot!

[krayton]

as far as i know. you CANT use the z32 ecu on the rb26 (someone can hopefully reassure this). but pretty sure you can have the rb26 chipped. (not to sure who does it locally though)

a lot of higher hp guys switch to map. u have many choice. most, practically all, the standalones have this option. cheaper stuff is basically all the little gizmos you can fine. similar to the safc. obviously the real decider is gonna be money and hp goal.

wiring info is not that bad. everything is scattered though. you dont need the whole clip, but it assures most your parts. depending on a mount kit, if you get the engine wiring harness uncut, youll be ok.

[scottsi]

thanks alot, well, i can solder, and i know people that can, so i can socket the chip, and i have a chip burner, and programs to write .bin files to that chip. I think i want to stay MAF, and probably run a z32 maf, or use the rb25 MAF if theyre equally the same.

and i plan on getting a swap with a uncut wiring harness. so everything should be pretty straight forward on the wiring side of the swap? im not a total idiot so i will probably do more research if i run into a problem (knock on wood)

also, ive done a bit of research on the mounts. i found mckinneymotorsports sells em, along with the driveshaft for 1150, is there any other places where its cheaper? i dont really want to swap the subframe since my research concludes that it is a bit of the "ghetto way" to do it

[krayton]

doing the crossmember swap isnt ghetto. plus im using it

its easy and saves that much money. driveshafts are easy to make from a local shop.

z32maf allows A LOT more then the rb25. but of course youll need to chip it or run something like the safc.

[Wulfgang]

Going from a Z32 to an S13.... aren't you going the wrong direction? The extra weight of the Z32 brings with it a solid, more competitive chassis, an OEM turbo setup, wider wheelbase, etc., etc.. Those cars are beautiful, and I would not have an S14 if I could have afforded a Z32.

...but I guess you've already made up your mind.

[rbsileighty]

Depending on how Carl does with the Bikirom thing... I'd say a PFC from Apex is a good option for management.

Since it sounds like you can fab pretty well... I'd make mounts, well actually I did make my mounts. Great fitment, and the only person I was paying to do it was me. Spend the extra money and buy a clip (typically assures an uncut harness and tends to include some other perks from time to time... even if it's only misc bolts), then use the R33 X-member and take measurements off of it in order to get an idea of how to make your own mounts... this method worked for me.

Good luck bud... enjoy the sweet sound and power of the RB

Ahh... don't forget that high HP 25's tend to need new pistons going by the guy's who are pushing theirs here on the board (I'm a 20 guy so I can't say this from exp).

[yellow_jacket]

as far as i know. you CANT use the z32 ecu on the rb26 (someone can hopefully reassure this). but pretty sure you can have the rb26 chipped. (not to sure who does it locally though)

Why couldn't you use the z32 ecu? They are both six cylinders, both run individual coil packs, both run maf setups, both run cas and both are efi. I realize that you would probably have to use the z32 harness and rewire it, but why couldn't it be done?

As far as bottom end strength on the rb25, it does like to break ring lands if the tuning is questionable. You can ask accel-junky(daniel) about that. At the same time with proper tuning there are guys getting over 500 out of them. Its all about the tuning

[scottsi]

Going from a Z32 to an S13.... aren't you going the wrong direction? The extra weight of the Z32 brings with it a solid, more competitive chassis, an OEM turbo setup, wider wheelbase, etc., etc.. Those cars are beautiful, and I would not have an S14 if I could have afforded a Z32.

...but I guess you've already made up your mind.

i dont think youve worked on a tt z32 , you'll spend HOURS cussing. lol

from a bit more research, im seeing that some guys running r33 swaps are trying to run r32 ecus that are chipped with a prom in order to run correctly on a r33 rb25det engine. I havent figured out why people are doing this, but i think it may be because of the OBD uncompatiblity.

I will probably Fab my own mounts when i find out the difficulty level of them, odds are, if i can save 700 or 800 bucks by doin it, i will

[Wulfgang]

I haven't even had the priviledge of driving a tt Z32, much less working on it. I was kind of wondering if you could get a VK45 to fit under the hood....

But back on topic, I also do not see why you could not use the Z32 ECU to run the RB. The firmware is probably almost exactly the same (if not the same). If anything, the Z32 will have more "features" since it came from a USDM car (not that you'll want those features). The only issue I can think of is the timing maps, and those can be changed with a chip.

[Carl H]

I haven't even had the priviledge of driving a tt Z32, much less working on it. I was kind of wondering if you could get a VK45 to fit under the hood....

But back on topic, I also do not see why you could not use the Z32 ECU to run the RB. The firmware is probably almost exactly the same (if not the same). If anything, the Z32 will have more "features" since it came from a USDM car (not that you'll want those features). The only issue I can think of is the timing maps, and those can be changed with a chip.

hehe, ive seen a vh45dett in a z32 all that can be said is amazing.

as for the z32 yeah the firmware is VERY close to the rb20's ecu however according to the fsm pinouts there may be problems with running a z32 ecu on a rb series car.first off is the lack of a 2nd detonation sensor, while rare that the car will actualy put the ecu into the low fuel map it still needs to be there to prevent codes and to keepp the ecu happy just incase it does hear knock.second is the egr valve bit, rb engines dont have egr........thrid is the aiv setup, again rb's dont have aivs.

hardware wise the early z32 ecu looks nearly identical to the rb20's ecu, so it might be possible to force the rb20's rom image onto a z32 ecu and run it like a rb20; currently looking into this now........you can run a rb25det off of a rb20 ecu but your vtc wont work, this is due to the fact that rb20's done have vtc, an rpm switch will fix this tho. as far as chip tuning goes, it definately is good for doing simple things like defeating limiters, changing mafs and injectors.for all intensive purposes thats how my car runs, ecu controls 550's and z32 maf and it does so very well.once i get a bit more adept at fine tuning ecus for injector and maf changes i might even start doing them on the side for ppl who want to just use a safc to tweak and not to control it all.

[Yellow4g63]

I have heard of Z32 guys running the R32 GTST ecu's. I think they reprogram the chip tho but I think it will work..... so says the internet lol.

[Carl H]

orly?hrmmm time to post up on tt.net, perhaps a search is in order first......

[scottsi]

so the r33 rb25det ecu is not useable for chip tuning purposes, and i would have to get a rb20 ecu and have that socketed? What feul control are you running carl?

[Carl H]

so the r33 rb25det ecu is not useable for chip tuning purposes, and i would have to get a rb20 ecu and have that socketed? What feul control are you running carl?

yah the rb25det ecu is absolutely worthless when it comes to chiptuning.ive heard of rb25 ppl in australia running rb20 ecu's with proper remaps for the rb25, the rb20's rom layout is much like the z32; major tables are at the same addresses.currently im running the stock rb20 ecu that i chipped to remove limiters, comp for 550cc injectors, and convert to z32 maf.

[scottsi]

Are there any programs that i can use to alter rom feul/timing maps? should i just run a powerfc? does that tune aswell?

[Carl H]

yah there are a few programs out there to use to tweak roms.of the many out there i use romeditor and live edit, there are others but these are the simplest with all the items you need.alternatively another guy is working on another software to be used in conjunction with his hardware, you can find out about it on http://www.bikirom.com .im currently trying to get the biki setup to work with my rb20 and if it works then good stuff for the rb guys, whats nice about the biki setup is that it uses consult data to maptrace.........im sure you've played with that using zcontrol.but yah the software is out there, hit me up on aim if you want to know more......

[scottsi]

wow, that program looks very promising, i would like to see some screenshots of the software and how it interfaces with the ecu

scratch that, i saw the screen shots, they look very good, i can wait to hear from you on how it works out, looks alot like Z control which i am very familiar with. I really hope all goes well because i will purchase it, keep us updated