Fuel Injector Upgrades for E28/1984 533i

[LookoutDC]

Hi Folks, 

In the process of rebuilding heads on a 1984 E28 533i and in the process of replacing other parts including the fuel injectors. 

I was wondering if there is any benefit from going from the 2 pintle to 4 pintle, increasing the PSI, going with Mustang injectors, or should I just get stock injectors or get mine cleaned/rebuilt? I have read various opinions on it but most stating that the ECU is not sophisticated enough to make adjustments for "upgraded" injectors to make a difference. 

Including, do I need to be aware of low vs high impedance/ohm's?

The car does have a mildly upgraded camshaft, 270 and headers with a Y-pipe if that would make any difference.

Thanks,  

[turbodan]

The 533i uses low impedance injectors, the mustang injectors are high impedance. The flow rate is significantly greater than the later B34 injectors too, though I can't remember the exact figure.

With stock motronic I think your best option by far is the stock injectors. If they're not leaking or clogged, run em.

[LookoutDC]

Thank you, I had a feeling that was the case. Thank you. 

[Mike W.]

And they have plenty of capacity, they're the same ones as used on M5s. Send them out for cleaning maybe, but I agree with Dan, no need for anything else.