I am wanting to replace the secondary injectors on my 8, probably will get new ones from Mazsport.
The Mazsport page has "High or Low Impedance Choices 650cc, 780cc, 880cc, or 1000cc"

Why would they have two impeadences for the RX8 fuel injectors?
What does the standard factory RX8 secondary flow?
I assume the ECU will not let the injectors go full output, but will I need to remap during the install? (Do I need to have this done AT the tuners shop?)

 

The OE injectors are high impedance.
The flows are 290cc/380cc/380cc.

I have 480cc in my third position and 380cc in my primary.

I have 630cc - 730cc injectors on my site for $60 a pair (with trade of your old injectors).

 

We offer various injectors to suit the customers specific application. Please give me a call and I will be happy to assist you, Scott

 

I've been searching, but I can't seem to find anything about the injectors really.

there are three sets, right? 1 for each port, which port set is primary, then "P2"?, and then secondary? When do all of these "activate" , can this setting be changed?

 

ALL of those questions are answered on this forum.
Read the stickies in the tech sections.
You can also browse the factory shop manual.

 

found it! there are just so many forum branches I never saw all of the stickies. Damn, all your information is giving me insomnia, do you have any more progress on your tuning video?

 

Progress. Yes. Is the end in sight? Unfortunately, no.
Life moves much faster than my video production skills.

 

hey nachos could you point me to which thread you're looking at? i must be blind but i've been looking for that info for a while..

 

Outsource!!

 

yeah, I hear India does pretty well with their movie making now too "Dhaliwood"

https://www.rx8club.com/showthread.php?t=53406

a good bit of injector information.

You really have to use firefox to view this forum, open up the parent forum "Tech & Performance" open all of its child forums in a new tab and read through every sticky in the child forums. You'll be able to tell the ones that you don't have to read too.

 

Holy S*it how did I miss that.. Must be going blind in my old age...

Danke schön

 

Wow. Has it really been three years!?!

 

I am flabbergasted

 

i've read all the stickies, the only thing I'm still a confused about is the calcLoad thing . what is that?

I understand fuel maps, but how do they change with different TPS values? or is it more complex than that?

 

CalcLoad is a value that the PCM generates based on all the inputs - MAF, BARO, TPS, IAT, ECT, VSS and RPM.
Ultimately, it ends up being roughly equal to the airflow through the engine in g/sec.

 

When changing injectors; will the ECU "re-learn" to use the higher flow rated injectors if the "learned" memory is wiped, or will I need to re-tune the AF ratio when changing the injectors?

In other words; can I swap the injectors in my home garage?

 

You have to tune for it regardless.

Also, I'm pretty sure the PCM figures fuel flow by pwm settings for the injectors, it doesn't have a flow meter or anything. So if your injectors are larger then things aren't going to match up.

 

It depends on the engine management, but most have a correction factor you dial in to scale the injectors.
Once that is done, there is nothing to relearn beyond the normal fuel trim.

 

In a perfect world:
The O2 sensor would just say "Rich mixture" and the ECU would go lean it till the proper AF ratio was reached; soon the ECU would re-learn what is rich and lean.

Not gonna happen?

 

To some degree, but the PCM wouldn't learn everything until you had driven in every possible load scenario.
Plus, the PCM can only do 25% or so correction +/-.

You really only want the PCM to correct +/- 6% maximum if you can help it.

 

ah,

you are making me proud!!!

good job.

beers