S4/S5 FC ECU conversion

[lee-bo]

Right then, im thinking about converting my S4 FC RX7 to run an S5 ECU, as in changing the plugs/wiring etc. Now my main question is - Is this possible etc, are they compatable if I connect the wires to the correct pins/change the plugs over etc? Im not a complete numpty and will follow the wiring, connect the correct signal wires etc, but I want to know if the S5 ECU 'operates' in the same way etc? The injector sizes etc are the same, the impedances are the same so wont have trouble there, but is there anything else I should consider etc, or has anyone attempted this mod before and can shed some light on it?

Lee

[lee-bo]

Could anyone help at all - or has anyone experienced this before?

Lee

[clive]

Easiest way to carry this out would be to leave the stock ECU alone and make your own loom just to run the engine with an ECU like one on the link.

http://www.adaptronic.com.au/product/e420d/

Few things that you may or may not know,

The series 4 is quite a different animal to the series 5 with the gear box different and stronger and a completely different axle assembly, again weaker under the back without an LSD.

I am told that an MX-5 diff unit can be fitted if this helps.

[lee-bo]

Thanks, I wasn't aware that S4 and S5 FC's had different gearboxs and Diffs/housings - you learn something new everyday... I know Turbo, and Non-turbo gearboxs had a different starter location etc...

Lee