Cheap Turbo ECU, Possibly From Another Car?

[crazymonk]

Hi, I have a 320 convertible 1989 model, that will eventually be completely rebuilt as it's a bit ratty, but for now I'd like to do a real made from bits turbo conversion on it for a bit of fun. I don't really care if the engine doesn't last that long as it won't be staying in the car anyway. I'm looking to do something low pressure, and just to give it a bit of extra kick. I have most of the parts to do the conversion anyway, injectors, fuel pressure regulator, intercooler etc, I'd just need a turbo and an ecu. My car has already been modified to run a lambda sensor, and has the 325 throttle body conversion with the larger afm from a 535. What I really need to know is whats the cheapest way of sorting an ecu, I don't really want to go down the megasquirt route, as I am having a customised ecu made for my new engine but that won't be for a little white yet, so I don't want to have to spend much on another one,.
Could I use the standard ecu at all? or could a piggy back be used, and if so where can I get one? Also could another ecu from something like a six cylindered jap turbo car be used, or is there far more involved to try an do that?

[Gunni]

If you use the 535i AFM then you should be able to measure about 220-230hp.
And use the ecu that is in your car. But you´ll need it custom tuned for the new AFM and injectors

[crazymonk]

Hi, my ecu is already chipped for the 535 afm conversion with the bigger injectors, I did that a while ago, but can the standard ecu cope with a turbo? Isn't the change in air flow going to be too much or it to cope with?

[Gunni]

No as you now have the range of the 535i AFM and whatever injectors you have to work with.

So I´d say you should be able to get at least 250hp from your B20 without issues.