sc 454 TBI fuel distribution question

[mobythevan]

This is for the supercharged 454 I am building for my truck, but should apply to a z car setup also

 

I am using a B&M 250 supercharger (same as holley 250 now). I have a four barrel TB with 4 injector ports that have the injector spraying just above the butterfly. I could use four 80lb/hr injectors, one in each barrel, but the problem is that at idle the secondary butterflies will just barely be cracked. I am worried about fuel getting through properly. The TB has progressive linkage so at an idle the primary butterflies will be cracked more. I would like to run two 160lb/hr injectors in the primary barrels only. I think at idle this will allow the fuel past the butterflies better. The only concern with the 2 injector setup is whether or not I will get good fuel mixture distribution to all cylinders vs 4 injectors. It seems to me since the 4 barrels are so close and any mixture just hits the supercharger rotors and then dumps into one larger plenum that it wouldn't matter much. I would like to try the 2 injector method, what do you guys think. Any issues I am overlooking.

 

I plan to use a solenoid like a diesel truck for cold start the just holds the throttle open a little more. That will also help the fuel to get through the butterflies at first. A lot of this depends on how much the butterflies will be cracked to idle the 454. Maybe it will be a none issue. I am also hoping that the high pressure injector spraying up top does not cause fuel to blow out the top of the TB all the time. Hopefully enough air velocity is going by to keep the spray down and in the TB bores.

 

I'll find out soon.