fc pro am

iTrader: (8)

So this year I decided to embark on what Ive heard to be a pretty straight forward and common project as well as overloaded with wild performance fun , thee "TII swap".

So far it's been ok , but also has it's fair share of annoying sitiuations, however, I am remaining confident and determined to complete the swap and someday soon, enjoy my FC once again.

Im running a 90 GTU with a recently purchased Jspec TII motor S5. My drivetrain is already bolted up and ready to go, with the exception of the elusive TII diff. Running the NA diff temporarily.....now on to the rest of this adventure.

This post is to update you guys of my progress and HOPEFULLY get beneficial pointers and tips whenever Im stuck. I will post often in this thread and look forward to hearing your feedback. I unfortunately lost my camera, so I will try and post photos of my progress using my lady's digi cam.

To begin, my first question involves ECU's. When running a Jspec S5 TII motor, does it matter which OEM ECU gets hooked up? The guy whom I purchased the motor from, stated that it is highly suggested to run a US spec ECU " only". My assumption was Jspec motor- Jspec ECU...go figure. Lets hear it guys.

Speer_vert88

I am in the midst of doing a TII swap into my vert. I think it was a big mistake buying the J-Spec motor instead of the USDM motor. The only thing I have ran into is problems with this adventure. My wiring is all screwed up, I bought a S5 motor and trying to put it into a S4 vert....What a hassle!!! I need to know what wiring harness and ecu to use. Can anyone help me out???

younG_Gunner

iTrader: (2)

Maybe this will help?

https://www.rx7club.com/showthread.p...jspec+swap+ecu

fc pro am

iTrader: (8)

If found a guy who's selling S5 ecu's and harness's on ebay. Not sure what your budget is, but your looking at $ 575 for just those two parts alone. Keep searching of you havent found anything yet, you might even comee across something cheaper.

Anyone got info on my ECU question????

fc pro am

iTrader: (8)

I'll look into that. Thank's G_gun.

I shall return yall!

AcidAngel7477

iTrader: (16)

you cant use the jdm wire harness or the jdm ecu..you have to use us spec.
i know what you mean as well about the hassle. ive been looking for t2 halfshafts for the t2 diff. and i cant find **** for under 80bux shipped. i guess beggers cant be choosers.

:AA:

Digi7ech

iTrader: (1)

Run US wiring.

As for the Diff. It will hold up to stock plus up'd psi.
Don't expect the LSD to last long though. Mine turned into a one wheel wonder a couple months after the switch.

fc pro am

iTrader: (8)

Ok. So far I've got the green light running US spec Harness. Should I get the complete harness or just the engine portion???

As for the ECU...what should I get? Jspec or US. AcidAngel, I feel you dog. LOL..Im laughing because I have the TII axles but no TII diff. The treasure hunt begins!!!

BTW, I love this club man...skip going to mechanics school.

djmtsu

iTrader: (3)

TII swap is easy. Took 2 days.

You can use an NA harness, there are only a few wires to change. Not a biggie.

ECU doesn't really matter. But if you can, get the US spec.

The engine harness is all you need. Don't worry about the drivers side harness at all.

fc pro am

iTrader: (8)

Suck's that you feel that way. Hope you get things squared away soon. Ever considered selling your Jspec? Who know's , the cash you get for it could get you a USDM TII.

Im going to 7 stock this weekend, so I hope to get a couple 1 one on 1's with those more familiar with this swap. Hopefully I find a few lead's for parts , especially Diff's and ECU's.

fc pro am

iTrader: (8)

Damn 2 days?? You must have a dealership garage or something. My cars been sittin for 2 weeks looking at me like " whats next".

Anyhow, you mentioned using the NA harness and just changing a few wires. I'll see what's up with this option. Look forward to getting a PM if something comes up.

For sure Im on the hunt for the US ecu and engine harness purchase which sounds like it would cost less than one that's complete, or like djmtsu suggests, using the NA harness and making a few wire adjustments.

Lovin the feedback guys. More please!!!

djmtsu

iTrader: (3)

Yeah, the ECU, just put a WTB ad in the 2nd gen FS section (when it comes back)
My friend (Fero313) did this and got one for a great price.

We are actually doing a 6-port turbo conversion on his GTUs. We are using the NA harness. He knows what wires to change, you might want to PM him.

We are hoping to have the car torn down in 1/2 day. Install all the TII bits the 2nd half, and shake down any problems the next day.

We just use a standard 2 car garage. But we have a good mentor!!

Boosted11

iTrader: (11)

Ive seen alot of topics in this category, that say the JDM ecu is worse then the US ecu.

djmtsu

iTrader: (3)

I think the JDM ECU is tuned for a different octane rating or something? Dunno, don't care.

Phantomkid

i swapped a t2 into my vert with a us motor both the turbo harness and na harness after installing it with the turbo harness i ran into a few problems, i torn down the na harness and rewrapped it and found it much easier then using the turbo harness, i think many would agree if your swapping a t2 into your na just to rework the na harness there is plenty off info on what wires need to be adjusted. good luck, i dont have much input on the ecu because it was a us motor but you should be able to pick one up for under 50 bucks

fc pro am

iTrader: (8)

^^ I see I see. Highly imformative guys, for real.

As of now, my options are somewhat narrowed down, so heres what I'll do:

- Keep NA harnes, and perform recommended adjustments.
- Search for US spec ECU which shouldnt cost so much, and install.

Negatives:

- Do not have a reliable mentor ( supervison )
- Budget is running a tad short.

So, off I am in search of this US ECU and answers to my questions involving the exact adjustments to be performed on my NA harness.

QUESTION:

Are there any performance negatives to running the NA harness hooked to a Jspec TII motor?? And secondly, how do I hook up the NA harness correctly so that everything runs smooth??? Im curious!

glh-fc

i just finished my T2 swap 2 weeks ago.it took 3 all nighters after work.pretty much went to work from 11:30-8:00 pm.get food then get to work.take a shower by 10:30 then on to work again.had a jspec motor w/ a north american harness and ecu.still using the stock open diff.by the way my car was a 90 gx/base.

i can't help you with using the stock n/a harness since the t2 harness was easier to put on while the motor was out of the car.the only headache was i had the n/a dashharness and had to pull one of the connectors.just took awhile to figure out which one.

after everything all said and done,if i had the funds,i would have went with a standalone instead of redoing the harness since the one i was able to aquire needed some work.

good luck with you're swap.

fc pro am

iTrader: (8)

Cool, Looks like you got things taken care of in a good time frame. These sucess stories are keeping me motivated, for real.

question for you though, and excuse my noob-ness. I hear a lot of people referencing the term "stand alone". What exactly is that and what are the advantages??

djmtsu

iTrader: (3)

Stand alone is a whole new ECU. ie-Haltech, Megadquirt, Microtech, etc.

You use a whole new harness supplied with the ECU. It also allows you to do away with the restrictive MAF and run MAP based.

A few drawbacks (since you have a tight budget) is price of the ECU, need to buy new sensors, and expensive tuning sessions to get it running right (no boom).

So you are in a position now to just piece it together. It isn't that hard. Also, I hope you are aware that with out the diff, you really aren't ready for the 'full' swap. I have been running the NA driveline behind the TII engine for 2 years no with no ill effects. There are naysayers here, but trust me, it should be fine. I know of two people who are pushing insane amounts of power through the NA driveline and are having no issues yet.

Just a little drunken FYI.

fc pro am

iTrader: (8)

^^ Got it dj.

Yeah man, that stand alone set up sounds like the business, and kinda pricey. For now I'll run factory ECU until my money is right.

As for the diff, Im just having a hard time finding the TII one. I was playing with the idea of installing the 1.5 KAAZ setup and calling it a day. We'll see.

For right now, I am on the free wheel NA diff and axles, but again this is temporary and like you said, not a "full" swap. I do have the TII axles though

djmtsu

iTrader: (3)

Werd.

I am just glad you are listening to people who have actually been there, and can actually give advise.

Most people who chime in have no clue because they have no experience, but have read about it so they are experts.

Or have been told by 'experts' who should never go near a rotary vehicle.

PS- sorry you live in LA and have to deal with Cali **** emissions tactics.

fc pro am

iTrader: (8)

Cali **** emissions tactic, thats hilarious. How about, **** emission's tactical force.

It aint a joke out here in L.A. Pardon my open mindedness, and no offense to anyone, but Im a black man in a Rotary. That's askin for it. Im like the highway patrol's dream. Wish Dave chapelle would do a skit involving something like this. Comedy.

Sorry for getting off the topic, but yeah, I wana pick everyone's brain about doing this swap right. I love the Rotary and everything it represents and would hate to have my car just sittin because I was too lazy to do research.

dsmrx7

The JSPEC harness can be used (if it's complete). I swapped a S5 Jspec T2 into an S4 N/A chassis. I just "flipped" the harness around (since everything is reversed) and extended some wires. It took some time, but it WORKS. I'm even running a REDOM ECU and the car pulls really strong. Here's a snapshot of the odd way the engine harness was run...

fc pro am

iTrader: (8)

This pic helps a lot, thanks.

I'll most likely hit up Rotary Resurrection as Im sure he has touched on this subject a Million times already. I've seen the thread's. My second task is to network with the heads going 7 stock on Sat and see what I can gather. I'll keep you guy's posted on what I find. Thx everyone.

SpooledupRacing

btw for the other guy from what I understand if u want to use a series 5 motor in a series 4 car then use the series 4 intake and sensors and the s4 n/a wireharness will work out easily

Dave