barrydklein

Hi all, already did a search but came up empty.

Does anyone have specs and part number for 3rd gen primary injectors. I believe they are 550cc. High or low impedance? Are the specs the same as the 2nd gen 550s other than side feed and electrical connector?

Thanks, I need info in order to program an AEM ecu for different injectors.

Regards,
Barry

SERIES7

Have you tried the ecu forums?

Sickass7

anyone know how much malloy charges for a pair of 550 cc and 850 cc injectors?

jeremyb

550 are the pri. and 850 are the sec. primaries are side feed i believe and 850's are top. OR it could be vice versa =X.

I also second series7. Go into the AEM subforum in the engine management section and ask this.

Jeremy

rxrotary2_7

I bet Malloy knows, have you called them?

rxrotary2_7

This is why you should just call Malloy. Case in point.
Where did this info come from? Primary is side feed while the secondary are top feed? What TF? I think you mean a 2nd gen is top feed and a 3rd gen is side feed? Either that or you *heard* something like that from someone?? who knows.

As for the original question, do you think you should be tuning an AEM while asking those questions?

Sorry to be rude, but these are the reasons nobody with anything worthwile to say posts anything anymore....

DaleClark

iTrader: (55)

To answer the whole shootin' match -

Primaries are 550cc, secondaries are 850cc. ALL of the injectors are high impedance. And, they're all side feed.

I want to say they're around $150 or so each from Mazda - not cheap. Definitely call Ray up - he can have you a price in no time flat.

Dale

barrydklein

What are you trying to say? I have the Miata AEM and simply need battery offset data to set up 2nd generation injectors. If you can't help me then please don't respond. The AEM and turbo are not even installed yet. I'm doing my homework before I start the project.

I have answered many questions on the Miata forum when I had the info and someone needed help.

Barry

scotty305

iTrader: (2)

This is the 3rd Generation Specific (1993-1995) section of the forums. Sorry if you're confused. There is a separate section for 2nd Gen (1996-1991, also known as FC) questions.

Good luck,
-s-

barrydklein

Ok, maybe my question was confusing, here is what I need to know:

Are the 3rd gen primary injectors 550cc ?

Are the 3rd gen primaries high or low impedance ?

Thanks again,
Barry

Mahjik

iTrader: (1)

Posted above:

FDeez

Yes, the primary injectors are 550cc. I believe all the injectors are low impedance.

jeremyb

Yeah I did just hear it from someone else. Even though you were rude and just flamed and not even answer his questions, I stand corrected.

Jeremy

barrydklein

Sorry, missed the above post. This was the info I needed. Sounds like the 3rd gen and later 2nd gen primary injectors are the same except for side feed vs. top feed.

I have a set of 550cc high impedance top feeds which are a drop in to the Miata rail and electrical connectors. AEM has the injector battery offset table for the 3rd gen, so I can now use that data to drive my injectors.

Just need a turbo and I'm ready to go.

Thanks all,
This forum was also very helpful in locating the injectors that I now have.

Regards,
Barry

maxcooper

Yes, the 3rd gen primary injectors are 550cc.

The third gen primary injectors are high impedence.

I am absolutely, 100% certain of both of those facts. Don't let anyone tell you any different.

I can't believe how much misinformation has been posted in this thread! Folks, don't answer unless you are least a little bit sure, and be sure to mention your uncertainty if you aren't completely sure.

-Max

maxcooper

I'm not certain about this , but I wouldn't assume that the settings would be the same for the 3rd gen primaries and the 550 top feeds you are using. It is probably a good starting point, but it is quite possible that the "perfect" settings for your injectors are not the same as the 3rd gen primary settings, since they are different injectors.

-Max

rxrotary2_7

Sorry bout earlier posts. I had someone **** in my cornflakes thismorning....

barrydklein

OK, I got more info on "battery offset" if anyone is interested. As voltage drops, the injector doesn't open as fully, so the ecu compensates by increasing the time that it is open to deliver the same amount of fuel. You need to input a table into the ecu to tell it how to do this. The AEM software has multiple tables for all different brands and sizes of injectors. They generate the tables by testing specific injectors. You are correct, perfect results will come from using the data for the exact injector used.

I spoke with AEM today, they said you just need to be in the ballpark, not critical. I just need to plug in a table from a similar flow rate and impedance injector. There is another step in the tuning where you input the flow rate of the new injectors compared to the old ones and it adjusts the pulse width to keep the fuel delivery constant. This step is the critical one in the process.

Anyhow, hopefully the RX7 injectors that I have should be OK.

Regards,
Barry