Hello. I just purchased an s5 street ported na block and wanted to swap it into my s4 since it has a blown coolant seal. My question would be can I run my stock s4 ecu if I swap my intake over to the block? I'm currently running tii intake with 550cc injectors in secondary. Everything is ported and I have s5 tii fuel rails. Idk if I need to swap in the ecu with the other motor or if I can just keep mine.

 

i think its best to just use the keg and all the s4 everything else.

the s5 has a lot of electronically controlled items that the s4 mechanically controls.

 

Ya I now that about the omp but I was just going to premix. Does a streetport require any tuning? Besides more fuel? I understand if I were to boost it id be changing everything.

 

The compression is higher so i would not rely on s4 fuel and ignition maps. If you were tip turbo it, i would consider using the s4 rotors