Im running mototron 60lbs high imppedance injectors and my stock FP regulator gives 50psi ??? (no vac) so i have set the injectorconstant to 65lbs.
At 570rwhp 5900rpm they are at 70% dutycycle....
stock fuellines, Walboro intankpump widh new wiring from the alternator, V-plus volt booster.
Tried lucas 42lbs before i installed the new wiring to the pump, FP at 58psi injectorconstant 49lbs and they hit 100% dutycycle and the fuelpressure dropped at the top....

Im very pleased widh the mototron injectors, idles perfect at 950rpm...

 

Any comments on the Seimens 57lb high impedence? or Seimens in general?

 

I honestly have never used the Sieman 57lb injectors but I will say overall that Sieman makes a great injector. I have used Siemans 55lb (low impedance injectors) and am currently using 83lb Sieman injectors. I would email Jack at Racetronix and see if he has any experience with the Sieman 57lb injectors.