Lou Byer

I have recently completed the mechanical portion of a Triumph Spitfire conversion to a 13B engine. However the car is not running yet as we have not been able to find information regarding the engine wiring. As it is not installed in a RX7 the engine and its CPU must stand alone. Does anyone have any information that will help? The Mazda is a 1986-88 13B with the stock CPU. If you can help please do so the race season is coming to a close and it would be nice to be able to take it out to test it before winter sets in. I live in central Indiana and an SCCA member and desperately want to drive this car.

satch

iTrader: (1)

Foxed.ca - Mazda RX-7 Manuals

Lou Byer

Thank you for your reply but stock wiring diagrams do not work for this installation. It is not going into an RX7 therefore the open plug on the engine harness, that would normally plug into the stock RX7 harness, is leaving the engine harness open. We do not know what or how to bypass that open plug so the engine and its CPU stand alone. I know the engine has been used for many other applications such as airplanes. And that has to require a different way of wiring the engine by itself.

KansasCityREPU

iTrader: (9)

You will need the stock engine wiring harness or make your own by following the factory wiring diagram and determine what is needed for your application.

If you where using an aftermarket stand alone CPU like a MS3, it would be different. Your not using a stand alone CPU, your using the stock CPU.

I'd make this simple by getting a stock engine side wiring harness so that it's just a plug in and go situation.

Lou Byer

Thank you for your reply but being very new to RX7's I do not understand what you are telling me. We have the stock engine harness and CPU so adding another harness confuses me. And could you please tell me what an MS3 is? And please clarify what a stock side engine harness is? Thanks

KansasCityREPU

iTrader: (9)

I guess we need start with some more background. We know you have the stock ECU and stock wiring harness that connects the engine to the ECU. Can you post a picture of the "open plug on the engine harness" you have questions about not being able to plug in?

Lou Byer

I have uploaded and created an album (titled 13B wiring) containing several photos showing the engine and various photos of the harness. All open plugs are shown please review these and hopefully you will be able to determine what needs to be done to save this build. I thank you in advance for any help and direction you can provide

KansasCityREPU

iTrader: (9)

I looked at the pictures. This is where you will need to take the wiring diagram and identify each connector on the harness and then determine if it is needed for your application. The wiring diagram will show the connector number and then you will need to identify that connector on the schematic. You might only need a few of the wires in a particular connector.

Lou Byer

Thank you, but could you specify which diagram? And where can I find it.

erick31876

iTrader: (8)

You are missing the 3rd ecu plug, I believe that this is the open connector your talking about, to get this , you will need to get a factory chassis/front harness. It requires a lot of de-pinning because it has the wiring for the whole interior on it as well. It has the connectors for the coils, cas, connects to the engine harness, and you will also need the battery/ starter harness which also connects to it. I would suggest that you download a fsm for what year engine you have from foxed. CA
I hope this helps you

Lou Byer

Thank you I have to ask what is "foxed.CA"

KansasCityREPU

iTrader: (9)

It's a website that has the scanned versions of the factory service manuals. From the website.

************************************************** ****
So you want to know about Foxed.ca?

Foxed.ca is owned and operated as a hobby by Thayer Fox, located in beautiful Victoria, British Columbia, Canada.

Foxed.ca started in 2003 as a school computer project and has slowly grown over the years. Originating from an old HP Pavilion, set up to store various files locally, it evolved into a dedicated multiplayer server. From this is did not take long until an FTP server was installed, transforming the old family computer into a digital briefcase for sharing with friends and family. A short while later, a copy of Apache was loaded and an http webhost was born.

Over time the original servers have died, and other scrap has taken their place, saving the old hardware from the trash. At some points, there have been up to five separate servers operating under Foxed.ca's umbrella. Most of the services offered were never really expected to be used by the masses. Instead, they allowed a platform to play and learn; we have had everything from DNS to SVN repositories. Truthfully, the only part of Foxed.ca to be publically successful is the hosting of the out of print Rotary Manuals.

I hope you enjoy your visit to our little domain.

Happy Trails,
Thayer Fox
************************************************** ****

erick31876

iTrader: (8)

Basically you can download factory service manuals and wiring diagrams for free

satch

iTrader: (1)

It's what was provided in post #2.

Lou Byer

I want to thank you for your input, but the engine builder sent me the link to foxed months ago when I asked for his help with this. At that time I did not know it was called foxed. I have downloaded diagrams from there but there 108 pages of wiring diagrams for a 1988 RX7. I do not know which one(s) to use my race car builder did not know and he has been building and wiring race cars for 30 years. There has to be a simpler, more direct approach to this problem than adding additional yards of un-needed wiring for a race car. It will never have dash lights, air conditioning, a radio etc. headlights turn signals and all the modern comforts that a street car has. So now can you give me a direction, an idea of what has to be done to wire a starter switch, into this system and make this engine work?

satch

iTrader: (1)

The ignition switch on your spitfire should contain a wire which is supposed to energize the starter solenoid so that should not be too hard to figure out. I'm guessing though you are asking more than how to engage the starter though. What you really need to do is decide which aftermarket ECU/EMS (not CPU) which you are going to use. Once you make that the decision will then in turn tell you which wires you will need. Sometime the AFM is needed and sometimes it isn't and it depends on which EMS you incorporate in the system. You need to focus on the pertinent engine sensors (possibly the AFM, TPS, CAS, pressure sensor, intake air temp sensor). You'll also need the wiring to the injectors and coils (some of this depends on the coils you use as are they the stock ones or the aftermarket ones). If you go stock, the wires to the lead coil are Black/Yellow and Green/Yellow (and that is it-and the stock coil won't work unless the unit is bolted to the body for grounding purposes). The trailing coil has two B/Y wires in one plug and four wires in the other plug to the coil and you'll need all six of these wires. The injectors each have two wires, one is B/Y which supplies voltage to them and the other wire is Light Green (most w/a stripe) and that wire is the trigger wire which runs to the EMS. You'll also need the main relay. It has 2 plugs. The plug w/2 wires has a ground wire and a B/W wire which is energized w/key to start and key to on. The other plug has four wires. The B/Y wire runs to the coils and injectors. The B/W wire in the 4 wire plug powers the EMS. The engine fuse box has an EGI INJ fuse. The wire coming off of it is Black/Green and it runs to the main relay so when the key is turned to on or start it powers the B/Y wire in the same plug and as already noted, this wire powers the coils (2 of them) and the 4 injectors. The fuse box (engine) also has the EGI COMP fuse which has a White/Blue wire coming off of it and it also runs to the main relay and powers the B/W wire in the same plug which as previously stated powers the EMS/ECU. This wire also runs to the emission solenoids. If you want to ditch most of them that is up to you. The main fuse in the engine fuse box normally powers the ignition switch. How you wire up your ignition switch is up to you but in the stock set up this fuse powers the ignition switch.

mikeyj

was wondering if anyone had any pictures or videos of this car for the wiring schemes i have recently bought it and the engine was swapped with the same engine before i bought it and have too figure out how too put it all together . this is my first rotary car and would like as much intake as possible # i love too learn and the reason why i bought the car in the first place

RotaryEvolution

iTrader: (30)

Foxed.ca - Mazda RX-7 Manuals

troublesubie

Good work
, i bet its a blast to drive.
Got any videos?

zaque

Going to revive this as it has a lot of useful information, to add/ask something.

Is there any reason the CPU no.1 would need replacing due to these issues?
I was having a problem with the seatbelt light flashing constantly like others, and my seatbelt wasn't catching properly. The driver door also didn't unlock. A Mazda dealer was telling me that both the CPU no.2 and CPU no.1, need replacing due to not agreeing.
I'd assume CPU no.2 doesn't agree just because of issues with it alone.

I can't hardly find information on CPU no.1, though.

sintri

idk how I even got sent to this thread