Accepted Answer

Hi, the 330i engine is not designed to be ran by a 325i ecu. The 330 has a longer stroke, so it will require more fuel and air to run properly. If it's running on a 325i ecu, all calibrations will be slightly less than they should be, and it could run too lean.
In short the mechanicals will not match up with the computer calibrations.

The 325i uses black colored injectors with the part number you listed.
The 330i uses Purple colored injectors with a slightly larger diameter pintle, for more fuel.

This is a tricky situation, not sure why someone would do this.
It would be best to run it off a 330i computer (DME), but you will have the problem of the anti theft system. For it to work, you will need a the dme, ews module, and the key and ignition lock cylinder as a matched set, or the anti theft system will not allow the engine to start.

You could try swapping out the injectors for 330i ones, and the 330i air mass meter part # 13627567451. The 325i uses a different air mass meter, and intake boot.
But I don't think many people have done this before, so it will be hard to gurantee anything to work 100%

Expert:	bimmaster
Pos. Feedback:	100.0 %
Accepts:
Answered:	10/8/2009

BMW Technician

3 years dealer experience, master bmw tech