NoPistons -Mazda Rx7 & Rx8 Rotary Forum

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-   2nd Generation Specific (https://www.nopistons.com/2nd-generation-specific-17/)
-   -   Swapping A Series 5 Afm Into A Series 4 Rx-7! (https://www.nopistons.com/2nd-generation-specific-17/swapping-series-5-afm-into-series-4-rx-7-a-10383/)

MAZDAROTARYPOWER 01-08-2003 03:42 PM

here it is!

1Revvin7 01-08-2003 03:45 PM

Cool. :bigok: SO i know the s5 maf is better, but umm anyone have any experience with the changeover? Or any #s on it?

j9fd3s 01-08-2003 04:01 PM

you can also use a v6 626/mx-6/probe one too. also k2rd can get the s5 afm connectors



mike

assgrabber 12-03-2005 06:45 PM

I followed the instructions the best i could, but my car wouldnt start. Frustrated, I whipped out the trusty manual and compared wiring diagrams between the two series(s4/s5) and made my own wiring decisions, pulled codes and made more wiring changes.



so here it is kids, the definitive wiring instructions!





...........S4................................S5... ..........

GRN/ORG...............+.........GRN/ORG

............BRN/BLK+BRN/BLK.......................

............BRN/BLK+BRN/BLK.......................(join these four wires together)

GRN/BLU................+........GRAY(green wire inside gray insulator)

BRN/WHT...............+........BRN/WHT

BLK+BRN



https://www.nopistons.com/forums/pub...IR#>/bigok.gif



note: my car has a 87 wiring harness-- according to the book the wiring is different between 87 and 88.

matts86fc3s 12-03-2005 07:41 PM

nice... i treid doing that to mine and it wouldnt start. i used the directions from the one in second gen FAQ and car wouldnt start. ill try doing this tomarrow

nismo convert 12-03-2005 08:21 PM


Originally Posted by j9fd3s' post='130813' date='Jan 8 2003, 05:01 PM

you can also use a v6 626/mx-6/probe one too. also k2rd can get the s5 afm connectors



mike







Second GEN? or the first Gen mx6, probe ect.?

matts86fc3s 12-04-2005 09:25 AM

what or who is K2RD, i need the connector

matts86fc3s 12-05-2005 12:29 AM

hmm... did the mod from s4 to s5... doesnt want to idle right. it will die if i let off gas and when i start to go it sounds like it only runs on one rotor... but after like 2 minutes with my foot on the gas it will idle decently

j9fd3s 12-05-2005 11:52 AM


Originally Posted by nismo convert' post='783548' date='Dec 3 2005, 06:21 PM

Second GEN? or the first Gen mx6, probe ect.?



93-97ish 626/mx6/probe

nismo convert 12-06-2005 08:27 AM

Cool, thanks, a n/a afm wouldn't work on a TII eh?

assgrabber 12-06-2005 10:23 AM


Originally Posted by 86fc3sMatt' post='783947' date='Dec 4 2005, 10:29 PM

hmm... did the mod from s4 to s5... doesnt want to idle right. it will die if i let off gas and when i start to go it sounds like it only runs on one rotor... but after like 2 minutes with my foot on the gas it will idle decently



this sounds like an idle issue. When you hold your foot on the accelerator to keep the motor running, what rpm are you at? if your around 750 then you need to set TPS and idle.

j9fd3s 12-06-2005 10:55 PM


Originally Posted by nismo convert' post='784223' date='Dec 6 2005, 06:27 AM

Cool, thanks, a n/a afm wouldn't work on a TII eh?



it will, but the calibration is a little different, so it may run wierd

CrassFC3S 12-07-2005 02:13 AM

how similar is the 626et afm to the s5 afm? i dont like the huge ugly s4 box

j9fd3s 12-07-2005 11:52 AM


Originally Posted by CrassFC3S' post='784467' date='Dec 7 2005, 12:13 AM

how similar is the 626et afm to the s5 afm? i dont like the huge ugly s4 box



same thing but its larger

Tessai 12-07-2005 05:55 PM

Is it the same electronically?



I mean, would it be a direct swap for s5 owners to test the "the afm is too small to make good power" debate I see so often on the other board?



I ask because my brother drives a 96 MX-6 so I could possibly do a back-to-back dyno if they are directly swappable.

j9fd3s 12-07-2005 09:27 PM


Originally Posted by Tessai' post='784617' date='Dec 7 2005, 03:55 PM

Is it the same electronically?



I mean, would it be a direct swap for s5 owners to test the "the afm is too small to make good power" debate I see so often on the other board?



I ask because my brother drives a 96 MX-6 so I could possibly do a back-to-back dyno if they are directly swappable.



yes, the 626/probe-mx6 afm is bigger and plugs right in and works fine, its been done!

CrassFC3S 12-08-2005 12:43 AM

so the wiring would have to be altered for a s4 correct j9? if it is a direct swap with the s5

j9fd3s 12-08-2005 02:34 PM


Originally Posted by CrassFC3S' post='784713' date='Dec 7 2005, 10:43 PM

so the wiring would have to be altered for a s4 correct j9? if it is a direct swap with the s5



yes, the 626/mx6/probe afm is an s5 but larger


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