is it possible to change from an electric omp to a mech omp while retaining the stock ecu?

 

No.

The ECU will go into limp mode without it, and the S5 front cover is different as well.

 

Yes.No. Maybe.

RTEK makes a chip that will neuter that Limp mode in the ECU.

But like he said, the front cover has to be changed to a S4 cover AND there is no provision on the S5 throttle body for connecting the mechanical actuating rod.

http://www.pocketlogger.com/index.ph...age=1&ecu=S5NA

 

Is that your FC in the pic?

 

To operate it you would have to switch to an s4 TB, but then I don't think there is a way to hook up the s5 tps to the s4 TB.

 

yep thats my baby!!