REW swap Ė things to retain from the RX8 - RX8Club.com

Go Back  RX8Club.com > Engine Swap Forum > Rotary Swaps
Reload this Page >

REW swap Ė things to retain from the RX8

Notices

REW swap Ė things to retain from the RX8

Old 07-20-2016, 09:54 PM
  #1  
Registered
Thread Starter
 
Join Date: Sep 2010
Posts: 25
Thanks: 0
Thanked 0 Times in 0 Posts
REW swap Ė things to retain from the RX8

Hi All,

Iím about to undertake a REW swap in to a S1 RX8 to be used as a dedicated track toy. I have the donor car, aptly named by my brother as the Canary.. Sheís complete and for all intents and purposes, stock..
The REW is on its way to me now from an Aussie importer, itís a fresh Japanese import from a S6 FD RX7.. Itís coming complete with manifolds, loom, ECU, box and the usual peripherals like the Alt and PS..

Iím about to start pulling the Reni out and parting out what I donít need but I want to be sure Iím retaining everything I need AND what I might need.. The last thing I want to be doing it sourcing parts Iíve just sold..

The plan is to go with new radiator and oil coolers, use the stock PS, I already have a Microtech MT-8s with a matching race dash. Fuel is sorted with a highflow pump and surge tank ready to go..

From reading the swap threads here Iím feeling like the main thing is to retain the stock wiring, ECU and the throttle body but thatís largely it. Iíll be keeping the box, I intend on using the bellhousing with the FD 5spd to retain the stock clutch set up. The AC can all go, thereís nothing bolted to the reni that needs to be retained (though Iím thinking of snaffling the OMP for my other RX8 because I think itís over performing..) and thatís about it..

Feels too simple, what am I missing?

Cheers All!
PsyDom is offline  
Old 08-05-2016, 11:20 PM
  #2  
Modulated Moderator
iTrader: (3)
 
dannobre's Avatar
 
Join Date: Feb 2004
Location: Smallville
Posts: 12,662
Thanked 83 Times in 80 Posts
Originally Posted by PsyDom View Post
Hi All,

Iím about to undertake a REW swap in to a S1 RX8 to be used as a dedicated track toy. I have the donor car, aptly named by my brother as the Canary.. Sheís complete and for all intents and purposes, stock..
The REW is on its way to me now from an Aussie importer, itís a fresh Japanese import from a S6 FD RX7.. Itís coming complete with manifolds, loom, ECU, box and the usual peripherals like the Alt and PS..

Iím about to start pulling the Reni out and parting out what I donít need but I want to be sure Iím retaining everything I need AND what I might need.. The last thing I want to be doing it sourcing parts Iíve just sold..

The plan is to go with new radiator and oil coolers, use the stock PS, I already have a Microtech MT-8s with a matching race dash. Fuel is sorted with a highflow pump and surge tank ready to go..

From reading the swap threads here Iím feeling like the main thing is to retain the stock wiring, ECU and the throttle body but thatís largely it. Iíll be keeping the box, I intend on using the bellhousing with the FD 5spd to retain the stock clutch set up. The AC can all go, thereís nothing bolted to the reni that needs to be retained (though Iím thinking of snaffling the OMP for my other RX8 because I think itís over performing..) and thatís about it..

Feels too simple, what am I missing?

Cheers All!
You have to choose what type clutch you are going to use. The FD uses a pull type clutch and the RX8 uses a push style like the FC.

The REW 5 speed won't fit without changing the drives shaft. ...and the shifter location is different

Best choice is to find an RX8 5 speed if you can. It is a plug and play solution that gives you a stronger tranny than the 6 speed

Everything else you have to decide what throttle body and how you are going to get the Power steering to work..... using a MT8 will mean you need the REW crank sensor setup....and you will need an RX8 signal for the power steering
dannobre is offline  
Old 08-14-2016, 04:36 AM
  #3  
Registered
Thread Starter
 
Join Date: Sep 2010
Posts: 25
Thanks: 0
Thanked 0 Times in 0 Posts
Cheers Dannobre,
For what ever reason I missed your reply.. or at least the notification of it.

I intend on sticking with the push type by using the RX8 bell housing bolted to the Rx7 S6 5 speed. (I also have a S5 Turbo 5 spd should that fit better) I'm not worried about the shifter being in a slightly different place, have angle grinder, will cut! I hear what you're saying about the drive shaft though, I'll price up having a custom one made, or an extension, and weigh up the cost verses getting in the RX8 5spd.
The problem is that the 5spd was never an option here in Australia, the low power version came as an auto here.. the uk got them though and I have rotor friends there so it might be an option.

For the power steering I thought to use the gear from Full function engineering, that should, if I understand it correctly, enable me to emulate the RX8 signal for the RX8 ECU to run the PS. I'm far from an expert on the MT8 (or auto elec's in general tbh), I'm assuming there wont be an issue using the same for the MT8.
The fall back if all goes to pot is change out the ECU or just run without the PS, it's a track car after all so it's not like I have to worry about low speed corners all that much..

The throttle body is a gamble at the moment.. On hand I've got a S5 and S6 RX7 plus the RX8 with the fly by wire.. I'd like to retain the fly by wire so I don't have to worry about putting in the cable style. however if it turns out I can't get it to work I have a S5 RX7 pedal assembly on hand as well.

I've had the engine just over a week and haven't had the chance to start looking at it yet so I'm not sure what parts will be compatible with what.. yet!

Last edited by PsyDom; 08-14-2016 at 04:39 AM.
PsyDom is offline  
Old 08-14-2016, 10:38 PM
  #4  
Registered
iTrader: (1)
 
LiveWire's Avatar
 
Join Date: Mar 2012
Location: Richfield
Posts: 438
Thanks: 0
Thanked 0 Times in 0 Posts
I think the rx8 5spd will be your best bet, you probably want to keep the rx8 CF driveshaft and stock PPF. May have to do some international shopping, but you may be lucky and come across a free shipping one. I got mine for around $800 free shipping.

I would decide on which front cover you plan on using first, as that will likely dictate the remainder of the build if you want to stay on the beaten path. Rx8 front cover seems to be the easiest with lots of information available.
LiveWire is offline  
Old 12-18-2018, 09:31 PM
  #5  
New Member
 
Join Date: Feb 2012
Location: Brisbane, Australia
Posts: 5
Thanked 0 Times in 0 Posts
Sorry to bring a thread back from the dead but I am not yet able to make a new topic, I generally search and find the info I need so haven't needed to post much as yet. I did search this time but most info relates to S1's...

I have a S2 R3, running Mazdaedit software. I also have a REW and single turbo from a previous project which I would like to swap in. I would like to retain the factory ecu to run the engine, as I don't have massive power figures in mind (400whp max). Swap parts from Nicon-rotary seem to make the swap near painless and also retain my 6 speed trans so theres no modifications rear of the firewall nearly. I would also like to stick with the FD front plate (I will make a mount to hold the AC compressor).

From the searching I have done we need to retain -
- RX8 trigger setup (https://nicon-rotary.com/en/product/...r-for-13b-rew/)
- RX8 throttle body (https://nicon-rotary.com/en/product/...-body-adapter/)
- RX8 MAF

Being a S2 it has a different OMP setup so I might not be able to just plug it in and forget it, Premixing isn't a big deal if that's what I have to do. But I don't wanna be risking limp mode due to it not being there.

One benefit of the S2 engine is 4 injectors, same as a REW so no fab work to add in 2 more.

Have I missed anything? The intention would be to use the RX8 sensors and wiring to keep the ECU happy and reading the same signals.
mr_squiggle_1 is offline  
Old 12-19-2018, 07:33 AM
  #6  
Registered
iTrader: (2)
 
Join Date: Mar 2010
Location: Cincinnati, OH
Posts: 82
Thanked 6 Times in 6 Posts
TomD_Cincy is offline  
Old 12-20-2018, 07:36 AM
  #7  
Registered
iTrader: (3)
 
MaD666MaX's Avatar
 
Join Date: Jun 2008
Location: Montreal, Qc
Posts: 549
Thanks: 0
Thanked 3 Times in 3 Posts
You seem to overthink or overcomplicate things...keep it simple, its gonna be easier and youll save some
time. Why not use a ecu that does everything you need? Can bus, dbw tb and so on.

everything works like oem in my car and i did it the most simple way i could.

the rx8 5 speed ia worth the money instead of making something fit that does not belong there. 500$ is pocket change in a swap like this, why not do it once and do it right?

ditch the omp, run premix thats it

if you dont want to do a full wire in ecu you can use the oem rx8 harness and the adaptronic modular works fine for me.

you said you are not an expert in electricity so thats another reason to make it simple and use a software that is easy to use and that you can do some things yourself

having only one ecu that does it all is worth alot imo

most ecu use map, only oem ecu use maf so with a ecu that does it all you could delete maf and omp and use the trigger setup you like.
with oem rx8 ecu you need to have maf, omp and oem trigger setup otherwise oem ecu will go limp

Last edited by MaD666MaX; 12-20-2018 at 09:17 AM.
MaD666MaX is offline  
Old 12-21-2018, 01:17 AM
  #8  
New Member
 
Join Date: Feb 2012
Location: Brisbane, Australia
Posts: 5
Thanked 0 Times in 0 Posts
Ummm, this thread was bumped up by me from 2016... He has his swap sorted from what I can tell elsewhere in the forum.

I asked some questions about doing it on a S2.
mr_squiggle_1 is offline  
Old 12-30-2018, 12:09 PM
  #9  
New Member
 
Join Date: Jun 2018
Posts: 8
Thanks: 0
Thanked 0 Times in 0 Posts
Msp to rew swap


So i have an rx8 5 speed on the way and ill be getting my rew after the new year. What i pulled out of my 8 is the 6 port msp motor. I understood that i could use the existing harness, but just realized that im going from a 6 port to a 4 port. Would it be better to get a harness from a 4 port renesis, or run with the rew harness and get a stand alone pcm?
RJStyles is offline  
Old 12-30-2018, 12:23 PM
  #10  
Registered
 
Join Date: Sep 2005
Location: Tampa
Posts: 653
Thanked 55 Times in 52 Posts
Originally Posted by RJStyles View Post

So i have an rx8 5 speed on the way and ill be getting my rew after the new year. What i pulled out of my 8 is the 6 port msp motor. I understood that i could use the existing harness, but just realized that im going from a 6 port to a 4 port. Would it be better to get a harness from a 4 port renesis, or run with the rew harness and get a stand alone pcm?
Use the 6 port renesis harness (that you already have) that way you can take advantage of the 3 stages of fuel injection. Buy an Excessive LIM with the 4 injector bungs then buy a fuel rail (like FFE brand) with 4 ports. Your going to have to go standalone anyway.

IMO, easiest way to do swap is....

Adaptronics Modular for RX8
Front Cover for RX8 (machined to fit REW front iron).
RX8 Harness
RX8 Accessories
REW Block
RX8 trigger wheel and sensor
Excessive LIM (4 bungs)
FFE Fuel Rails (4 bung secondary)

Last edited by strokercharged95gt; 12-30-2018 at 12:26 PM.
strokercharged95gt is offline  
Old 12-30-2018, 12:24 PM
  #11  
Modulated Moderator
iTrader: (3)
 
dannobre's Avatar
 
Join Date: Feb 2004
Location: Smallville
Posts: 12,662
Thanked 83 Times in 80 Posts
Originally Posted by RJStyles View Post

So i have an rx8 5 speed on the way and ill be getting my rew after the new year. What i pulled out of my 8 is the 6 port msp motor. I understood that i could use the existing harness, but just realized that im going from a 6 port to a 4 port. Would it be better to get a harness from a 4 port renesis, or run with the rew harness and get a stand alone pcm?
The first thing you have to decide is what ECU you plan on using. After that you can decide what trigger you are going to use.... and the rest kinda falls into place. Personally i didn't use the OEM harness and RX8 trigger.... so I went standalone and a built harness... but there are lots that have used the OEM and plug in like the Adaptronic and have had good results.
dannobre is offline  
Old 01-01-2019, 09:59 PM
  #12  
New Member
 
Join Date: Jun 2018
Posts: 8
Thanks: 0
Thanked 0 Times in 0 Posts
Thankyou so much for the advice. I feel confident in the mechanicals but feel at a loss when it comes to the electrical. What kind if issues did you run into as you adapted the 8 harness? Is it truely plug and play?

Last edited by RJStyles; 01-01-2019 at 10:08 PM.
RJStyles is offline  
Old 01-01-2019, 10:27 PM
  #13  
Modulated Moderator
iTrader: (3)
 
dannobre's Avatar
 
Join Date: Feb 2004
Location: Smallville
Posts: 12,662
Thanked 83 Times in 80 Posts
All I did with my OEM harness was strip everything out that I didn't need... and reshield it
Basically that was most of it 🙂
I used a wire in ECU and made my own harness... using a pre-built loom the first time.... and using plugs and bulk wire the second time. There are pros and cons to both...

Depending on you end goals and who you are going to get to do your wiring...and your budget, you will have to decide what you are going to do. The harness I am working on now has north of 100 hours of work into it... and I'm still not done, so if you had to pay a shop for that you would be broke.

dannobre is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Tunkka
New Member Forum
0
07-14-2016 03:55 AM
newalliance123
Rotary Swaps
32
02-24-2013 12:43 PM
Strokeon6s
SE For Sale/Wanted
0
11-17-2011 03:16 PM


Thread Tools
Search this Thread
Rate This Thread
Rate This Thread:
You have already rated this thread Rating: Thread Rating: 0 votes,  average.

Quick Reply: REW swap Ė things to retain from the RX8


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.