xar

Hey guys,

I cant seem to find an actual answer anywhere - however I did search.

Theres a lot of JDM imported motor setups that include everything the motor needs to run... I cannot find any S4 turbo motors locally, but the S5 is incredibly abundant.

So Im wondering what exactly is needed in order to put the S5 Turbo Engine, into my S4 NA? I get lots of different answers and hopefully I can finally get a clear one.

And why is it apparently so much more difficult?

Thanks,
Spence

rotaryracer1

iTrader: (1)

hey spence, this issue you are asking about has been talked about alot and you will be able to get the answer you are lookin for alot sooner by doing a search for the info you need. good luck man

87 t-66

iTrader: (133)

sunshine

iTrader: (3)

Yeah, its been covered a ton. Ive personally answered this question a few times, so you can use my screen name to help your search.

The short answer is no. Not without a lot of small changes to be made. One of the small changes in the electric OMP of the S5 versus the mechanical OMP of the S4. In the S4, you will not have any oil meetering, if the electric S5 unit is not working. There are other small issues...so do that search.
-a

FC3Sdrift

iTrader: (5)

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/how-splice-s5-tii-engine-into-s4-chassis-703692/

xar

I just searched another hour and Im still turning up rather dry, I read FC3SDrifts thread a fair bit, but Im still rather confused.

I hear that the Non-Turbo S4 harness can somehow be wired up to the S5 Turbo engine, and then add a couple sensors or something. Id love to see a buildup or a guide atleast more info on this topic - I seriously cant find anymore.

Thanks,
Spence

Napsterfreak15

I actually did this except my shell was an S4 Na auto and my engine was an s5 Turbo manual. If your trying to use the s4 harness its not worth your time. I got a Microtech Lt10s that came with its own harness.

xar

so wait, if I plan on running an aftermarket ECU. like Megasquirt or whatever can handle a T04E. That harness will somehow work?

Theres two harnesses arent there - theres one for the engine and one for the chassis. The engine one from the S5 engine, wont clip into the S4-NA Chassis harness... Right?

Friggin hate wiring

hurleysurf24

iTrader: (3)

dont run megasquirt .. just get a microtech

xar

Okay, so if I get that though then still what is needed to put my S5 Turbo Engine, into my S4 Non-Turbo? heh.

hIGGI

iTrader: (7)

if you use standalone EMS, then you are all set...your current chassis harness (driver side) will do the job just fine....

HAILERS

There's really been just a bag full of threads on how to put a Series five into a series four.

You already KNOW the series five EM harness won't mate with the series four FRONT harness nor the series four ECU, whether turbo or non turbo ECU.

The series five EM harness can be made to mate with the series four ECU and Front harness, but only by looking at the series four and series five wiring diagrams and swapping wires around and splicing other wires together. That has been done recently and written about on this forum. And I think Higgi' has a friend who has written about this but I can't remember his name, only that it had a $ sign in the name.

Then you'll be reminded the series five has an electric OMP whereas the series four had a mechanical OMP. So you have to address that issue. The easiest way is to just swap a series four turbo front cover to the series five turbo engine. But now you've created a new problem in that the series five throttle body has no attachment for the actuating rod for the mechanical operated, series four pump you just put on with the series four turbo front cover.

Then again you should not use the JDM EM harness anyway because it does not have the wiring for the wipers in it nor the cruise control wiring. You can overcome this by pulling your old n/a EM harness apart and extracting those wires and adding them to your JDM harness.

Then again you can throw away your money on a *stanalone* EMS. Of course with those, all you have to do is throw its wiring into the engine bay and close the hood. It will by magic , all by itself, attach itself to the proper items under the hood. Pure d magic. Purely amazing how that happens. No thought needed. Just *happens* all by its lonesome. And don't worry about tuning the EMS to the engine. Just *happens* by magical means. Or take it to a *tuner* who will tune it for, what? A six pack of beer in a half hour? Yes.

Actually using a series five in a series four should be considered a fun project. Plug and play sucks big time.

There's more involved in the swap than the above. Just do a search of the threads already posted on this subject, and look some more on your own.

It never hurt to download the series four wiring schematics along with the series five wiring.

AH! I think I remember Higgi's friends name. LUCIUS$ or the like. Maybe $LUCIUS??? He had a whole thread on wire pinning from series five to four or vice versa. But then you had to know about the items he wrote about to understand it. Like the FEM-01 stuff.

MmSadda

iTrader: (2)

bullshit.

it's bad enough that you ask us one of the most common questions on the forum, but you are not helping your cause at all by lying. Unless you are search-retarded, in which case I apologize.

xar

Wow thanks for being so kind...

I searched S4 Swap, S5 Swap, S5 into S4, S5 wiring swap, S5 wiring, Harness compatability, Turbo into NA - etc etc.

And turned up with a bunch of barely related threads.


-Hailers, well thanks for the info - I dont think I will use a standalone until I get into some crazy modification, primarily I just want to get it running, as well I dont have Cruise control so that might help a bit :P. Im hoping this swap wont be a mess and just the splicing and wiring can be done without a ton of hassle. I dont know how much longer my beater will last until my RX7 is finished heh. (hopefully a while)

Thanks,
Spence

MmSadda

iTrader: (2)

There should be plenty of info in the archives if you search there.

To paraphrase, though- You'll need many parts and a lot of time.

It should be possible, and more realistic to find an S4 engine, and swap that. I know you said you're having trouble, but I know I've seen 'em for sale before. It's a much easier swap, and you can make power like an S5 by swapping turbos, and throwing on an exhaust.

Napsterfreak15

I tried wiring my s5 engine harness into my s4 dash harness only to find when i connect the battery it tried to start. So after i fixed that (i have now idea how i did it by the way) my injectors never worked and i have the right amount of voltage. And just to let you know i had over a hundred pages of wiring schematics for an S4 and an S5.

So then i got an s5 dash harness and plugged everything in and damn injectors still didnt work.

After a couple months of working on it i was like f this and bought an lt10s for 1,000 and got it installed and my immissions removed and block plated for about 800. so 1800 was my total and if your setup is stock there is no need to tune it, which i didnt tune mine but at least it runs and runs great

xar

Hm well thats weird, I wonder why splicing and all that would make the injectors not work - I wonder what caused that... It would seem simple to get a JDM motor from one of these companys (S5) and then get a LHD Engine and dash harness or whatever doesnt clip up to the S4.

The swapping front plates and manifolds and sensors and crap, Im always afraid when I open up the engine that something wont go back together properly and then Im really "Fuct".

Spence

xar

http://www.japanracingengines.com/engineview.asp?id=66 is the setup Im looking at, its S5, and its local, and rather cheap - hoping it wont be some stressful BS trying to get my dash lights or windshield wipers to come on.

hIGGI

iTrader: (7)

Just to give you some idea what it will take (electric wise) to get S5 engine + harness into S4 car, here is Luciu$'s writeup on the swap we did few years ago.

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/s4-na-s5-jdm-turbo-conversion-405617/page2/

Mechanically its pretty simple, use all TII parts (trans, driveshaft, diff, halfshafts, starter and you are set)

good luck!

HAILERS

Thanks. It's been driving me nuts trying to remember the name Luciu$ and not being able to remember how he spelled it.

And yes, that thead is the one I was referring to: https://www.rx7club.com/showthread.php?t=405617&page=2

It helps to have both series wiring diagrams handy to understand it.

xar

Cool - Thanks guys, well if I happen to treat myself to the motor, or maybe get lucky and find a parts car for Christmas!

Happy Holidays,
Spence

SpooledupRacing

I did not read all the stuff above but to be qucik and get u a start....

S5 engine with S4 intake manifold that way u can use the S4 wire harness ..

thats what I am doing.. if u need any help feel free to pm me.

FC3Sdrift

iTrader: (5)

your injectors didn't work most likely because when you wired up you probably used the S5 wiring for the CPS ...but didn't touch the wiring for the coils.....i bet you didn't have spark either

if you would have used the S4 CPS plug and wired that into the ecu guaranteed it would have worked.....i had the same problem....took me a day to figure it out