EFI Fuel Injectors

[JohnnyT]

Question regarding fuel injectors and technology.

Is there a compelling reason to choose high impedance injectors over low impedance?

Has there been real improvement in Fuel Injectors over the OEM injectors in my 1987 911 Carrera?

Considering update to EFI for improved ability to properly tune the Air Fuel ratio and gain a little more efficiency.

Thanks,
John

[Raceboy]

Fuel injectors have been through big improvements over old EV1 style design.

Newer, "pencil" style injectors have better atomization, better response (less dead-time) and can cope with wider range of pressures and different fuels.

Some Bosch EV12 or Siemens Deka injectors would be my choice anytime over old style ones.

[HawgRyder]

The difference in impedence may have to do with the response time (reluctance of the coil).
The high impedence one may limit the RPM factor of the engine?
Bob

[Raceboy]

Originally Posted by HawgRyder

The high impedence one may limit the RPM factor of the engine?
Bob

There is no practical difference other than control method.

[Lapkritis]

You can always add a resistor on low impedance if your ecu only drives high impedance injectors. I run the Siemens deka on my non-Porsche turbo application and studied up quite a bit before purchase. Given the single valve/narrow port on the Porsche, the deka may not be the absolute ideal spray pattern but considering some of the tech the fuel traveled through from the factory it is likely to be an improvement even if there is more wall-wetting than one might like.