if you look at this pic close, notice that the Front P1 and Rear P1 are wired side by side. As well secondaries and P2's.. if you trace the black/blue wire back to the connector, you should be able to determine which is which

 

I like that idea.

 

Number one tip, take digital pictures and mark the leads before removal.

I hope this is correct, please feel free to correct any errors....



Fuel Rail 1 (two injectors)
Both leads for this fuel rail come off of the main harness together.
Front rotor injector wire color is light-green and red. (Front Primary 1)
Front injector Wire lead has White colored tape

Rear rotor injector wire color is light-green and black. (Rear Primary 1)
Rear injector Wire lead has Tan colored tape.

Fuel Rail 2 (four injectors)
The two center (the middle) injector wires come off the harness together and split.
Front side of the middle split has Yellow colored tape.
Rear side of the middle split has Green colored tape.
The two end (front and rear) injector wires come off the harness separately and have no colored tape.

The front injector wire is Green and Red. (Front Secondary)
The front rotor middle injector wire is Black and Blue. (Front Primary 2)
The rear rotor middle injector wire is White and Green. (Rear Primary 2)
The rear injector wire is Black and Blue. (Rear Secondary)

 

OK.
I'm having difficulty in understanding what you are trying to clarify.
You just spelled out, in somewhat lengthy prose, exactly what is shown in the diagram I posted at the beginning of the thread.
Just follow the diagram. Its all shown for you there in intimate detail.

 

I added the tape colors....

I also wanted to add way the wiring pairs split from the harness.
Seriously, what really confused me was that a 4 port also has secondaries, but the 6 port calls those positions P-2, so in some places, the manual seems to call the 6 port P-2 spot "Secondaries".
(Which would make my 4 injector rail colors wrong if the secondaries were supposed to be in the middle)

I am very glad to know the color order is correct, and thank you for posting the original.

 

Sorry if this is a noob question, what is a safe cc # for N/A RX8 to upgrade primary & secondary injectors using the stock ECU.

 

Absolutely no reason to do this.......

There is more than enough fuel for any NA application with the stock injectors

 

Thanks for the clarification, reason I asked is when I changed my plugs and spark plug wires this Pepboy Seller said I can upgrade my injectors for better performance for $25 and keep my OEM ECU, I knew at first he didn't knew what he's talking about cause he tried to sell me Synthetic oil and that's a NO BUY.. jeje

 

Wow...those are cheap injectors

The ECU could likely handle +/- about 15% and still give you enough trim left to work

 

Hi

On the injector issue

i am porting a bit etc on my 8 with rebuild,

you guys say injectors is big enough,

but my question is if anyone knows if there is a maximum (not thinking of 100% duty cycle) but a maximum in the program on ecu to say no more fuel, like a limit or will it still first look at the sensors to first

I am just worried i start to run lean if it so happens the ecu has a upper limit

anyone know?

thanks

 

Jeff.... AKA MazdaManiac could help here...

 

Considering the stock tune is 10-15% rich at higher flow rates anyway ( CAT cooling) ...the porting if it improves flow at higher rates will likely be no problem (even without a tune)

 

okkkk

 

Is there a chart anywhere for what size injectors to upgrade to while running a turbo?? I am going be getting my turbo upgraded by BNR and they said it should be able to handle 360whp. I only wanna run about 325-330whp. Is there a chart or anything that explains which injectors I should change out and to what size? Im still learning the fuel system on this car. Thanks!! By the way, this thread is the product of a search!

 

I have 650cc High Impedance injectors I was about to release...

Two options Plug and Play and ones that you solder...

Shoot me a PM I will have these ready for everyone to buy Monday

 

My apologies for not elaborating more, Monday I will provide a breakdown for you.

 

You 2 are funny You both should be in the "special" Olympics for sniping

 

I won't even try bowling...it would just be further conformation for me .......

 

Hey MazdaManiac!

Since this is a thread with injector information, could you also post what size fuel injectors that Mazsport used to sell with their Fuel injector kit upgrade? The reason I am asking is because I currently run the Interceptor-X and I want to switch to the Cobb Access port with a tune done by you. I know that I need to know my injector sizes in order to get a base map, so I need this information or a way to find out this information.

on my invoice, the part number was Injector-Kit-RX8 and they were selling them for around $560.

 

has anyone just removed the pintle caps to increase flow?
olddragger

 

http://kgparts.com/index.php?page=rx8modinject

I have these which is basically what you are asking

 

what was the flow rate off the ones you did ?
olddragger

 

here is the flow sheet they provided

 

whoa!
OD

 

Uh, I am not jeef, but I have the injectors that Scott sold. He sold 650cc/min Sieman Dekas (High impedance) and 780cc/min Densos (IIRC) that were low impedance. While it has not yet been proved by a failure and I ran the 780s for several weeks, you should not run low impedance injectors on the stock pcm as it likely does not have drivers to run low impedance injectors (the int-x does.) Again, while I dont know of any failures, running low impedance injectors on Honduhs has fried boards in the past.

If you followed Scott's suggestion on where to put the injectors, you may want to consider switching the larger injectors to bank two. (As you will be pulling the 780s.) You can get 650s from Fluid Motorsports. Make sure they are machined correctly. (The ones you got from scott had machined collars. )