New ecu, will a stock one work for my application?

[chalander]

Basically as the title states, I'm currently running a mines ecu and want to revert back to the stock ecu. Will I have any problems doing this? Will I be running richer or leaner?

Mods:
•1st gen DSM injectors 450cc
•FMIC with cone air filter
•3inch exhaust turbo back with 3inch resonator
•MLS head gasket with arp studs
•Stock CA18DET t25 turbo
•Fuel pressure regulator

Some stuff is irrelevant but I felt worth mentioning.

[mbmbmb23]

According to Deatschwerks fuel calculator you'd need to turn the fuel pressure down from 43.5psi to 30psi to simulate the 370cc injectors that a stock fuel map is tuned for. Im not sure how far you can lower the pressure before it runs like crap, or at all. Maybe someone can chime in?

[240Clarke]

My cars AFR were 100% better at a fuel pressure of 25psi. Ran pig rich until I lowered it. Im curious as to how people answer this question, because I turned mine back up to 36psi idle out of fear I would harm something, though AFR's were good.

[float_6969]

Stock ecu is setup for 370cc injectors. You're running 450's, so it'll be too rich everywhere. You either need to get it chipped for those injectors, or turn the fuel pressure down so those injectors behave like the 370's that the ECU is expecting.

There shouldn't be any harm in running them at a lower fuel pressure, although I wouldn't go any lower than 25psi.