I have 2 factory ecu's one with a part number N3A1, and the other with a part number N3A7. I believe the N3A7 is for a 1995 RX7? and the N3A1 is for a 1993 RX7. Im not sure if I should sell them or what... The N3A1 ecu works perfectly fine, EXCEPT if you have emission testing in your state, it will not allow you to pass smog... The N3A7 ecu on the other hand, honestly I have no idea if it works well or not, it didnt work well in my car, so I wouldnt want to sell that one... what should I do with these?

 

they're all basically the same. Just that some are for Autos and some are for manuals. Aside from that, they should all react the same, except putting a cali ecu in a non-cali car will cause an EGR related CEL.

 

the N3A1 ecu is for a 1993 5 speed manual RX7, and its a non-cali ecu. the N3A7 I believe is for a 1995 5 speed manual RX7, and is also non-cali. Difference is that the N3A1 ecu is partially damaged, in that the air pump signal does not work, and you will not pass smog with this ecu, otherwise I've been driving everyday to work for over a year with it, and no other problems. The N3A7 ecu, WILL allow you pass smog, and is not damaged in any way, BUT it has a strange intermittent idle flucutation between 1-3k rpm, and it can happen, and go away at any time. Im not trying to solve a problem, im just wondering what to do with these, I dont want to throw them away

 

I think the N3A7 is a Japan or non U.S. model ecu, if so, it may or may not have all the emission control system components programed into the prom. I could be wrong but that may be the reason why you are getting some idle flucutation. If it is a JDM there might be a speed limiter setting in the factory setup. I'm not sure if there is anything different in the ecu but the JDM harnessnes need a wire cut to get rid of the speed limiter.

 

Please give the full PN

 

no problem...the ecu that works fine with no drivability problems at all, is the N3A1 18 881. The other ecu I have is a N3A7 18 881A, I have no idea if this ecu is in good condition, I just know it didnt work well in my car.

 

ECU Numbers pulled off Mazda Motorsports site:

N3A1-18-881* CONTROL UNIT,E.G.I. $2,924.50
$469.98

N3A1-18-881A* CONTROL UNIT,E.G.I. $1,513.75
$469.98

N3A1-18-881B* CONTROL UNIT,E.G.I. $3,397.70
$469.98

N3A1-18-881R* REMAN CONT UNIT EGI $1,101.51
$669.99

N3A1-18-881R-0B* REMAN CONT UNIT EGI $200.00

No hit on N3A7-18-881A; sure the 7 is not a 1

 

Continued:



18-881 = Control Unit,General

N3A1 = FD ECU Federal M/T goes from 881 revisions A, B, and Remanufactured
N3A2 = FD ECU Federal A/T goes from 881 revisions A, B, C and Remanufactured
N3A3 = FD ECU Cali M/T goes from 881 revisions A, B, and Remanufactured
N3A4 = FD ECU Cali A/T goes from 881 revisions A, B, C and Remanufactured

no N3A5, or N3A6; maybe JDM markets

one listing for N3A7-18-881C; but no prior listings for revisions A and B ?? And I do not find any '93-'95 FD referance to this part.

No hit on N3A7-18-881A; sure the "7" is not a "1"

 

N3A7 prefix indicates a manual transmission japanese (and possibly other rhd market) ECU.

 

here is a picture of the "N3A7-18-881A" ecu, so that way you guys will believe me lol

 

Not that I don't believe you, just stating that the N3A7-81-881A is not a US available part. Mazdaspeed Motorsports site lists many JDM parts that they consider interchangeable with US cars and feel has a market demand. This ECU may not drive all US "features".

 

Ok thanks for the info... In that case theres nothing else to do but throw it away. I may have to throw both ecu's away, even though the second one seems to work well

 

if it seems to work with engine running smoothly, it is probale ok for the car ... may not met emmisions, if that not an issue keep it and use it

 

I threw away the N3A7 ecu, because nobody in america can use this, and as for the N3A1, it is in great shape, almost looks brand new (I have pics), and works fine. I have a post in the "parts" section if anyone wants to buy

 

threw it away?
Guys up in Canada could have used it for their RHD RX7s or Ebay it.
its a 5speed ECU. 4 socket
Series 6.
Still 8 Bit.

i'd gladly take it if you're giving it away for free.