48 # high impedance or 55 lb low for a FAST xfi system?

corvettedave01

Active member
Joined
Nov 23, 2008
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30
What injectors would be best?

427 sbc with afr heads, solid roller, 10.5:1 cr, Motown ported intake.

I have a FAST xfi system that seemed to be running ridiculously rich, gas on the floor of the intake etc. after I had it tuned with 55 lb low imped (Delphi) injectors. The tune was running at 50 psi fuel pressure, which I thought was way too high as well.

I put the high impedance 48 lb (Venom) injectors back in and now need to retune it, but thought I would double check with you guys as to which would be best?
 
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