MSefi.com read only forum (Jan.15,2018)

Hello,

I'm in the process of gathering parts for the efi retrofit on my chevy.

I calculated that the engine would require 42 lbs/h injectors and the supplier of the manifold suggested bosch injectors.

I see there are several types running from low impedance to high impedance. As far as I understood, ms does not support 8 low impedance injectors... so i'm confined to the high impedance types. Anyone have a correct partnumber for those and what are the disadvantages from low to high impedance ?

Yves wrote:As far as I understood, ms does not support 8 low impedance injectors... so i'm confined to the high impedance types.

My V12 Jag is running on 12 low impedance injectors, 6 per injector circuit. In fact, I have come accross a serious pro ECU that can NOT handle low impedance injectors (in an optimal fashion that is).

Still, if I could choose I would go for high impedance- just to eliminate possible flyback issues.

If you have the choice, may as well go Hi-Z as far as I can tell.

Some cars run low-Z with resistors rather than low-Z and PWM.

What size motor are you running? Fairly stock V8 42lbs would be in the range of 4 injectors and TBI. That 40-50 range seems to be where many of the injectors switch to low z's. Below that the common ones tend to be High z's. But Im fairly new to this so I could be wrong.