Everyone says to go to a smaller carb when supercharging. Will My Bigs 950 be too big to use with a procharger? The venturi size is the same as the 750. Mine has been CNC ported to increase flow but the venturi size was not changed. The idea was to smooth the airflow for more CFM but not change the venturi to get a good fuel signal.
It depends on how much power you looking to make. Quickfuel and the other few blowthrough carb'd people have all there 750cfm carbs rated to support around 1000 hp.
I'm not sure if this would be the same for a supercharged application. But.... the general rule for Buicks is they do much better with a bigger carburator. When I switched from a Vac. 750 holley to a 950 Hp, I took six tenths off my qtr. mile time. Don't listen to the usual Chebby, Ford, or Dodge guy that says that carb is too big. Buick is a different animal all together. By the way is this for a 350 or a 455? If it's for a 455, I would think you'd be ok. Maybe someone with a little more knowledge in supercharging would know. John.
I have a procharger kit on my car. When it comes to just motor, i agree that the 950 would be good and buicks usually like larger carbs, but with supercharging the air is being forced through the carb and not having to be sucked through like a NA motor. Power adders in the Turbo or Supercharger category require a purpose built carburetor to accommodate the fuel curve change brought about by Forced Induction. While there is a multiple number of ways to achieve desired air/fuel ratios under normal conditions as well as in boost mode. In our experience the carburetor sizing generally needs to be smaller than most conventional air flow calculations would estimate. A smaller venturi helps the carburetor maintain a much safer air/fuel ratio at higher engine speeds. Moreover, in our experience our 12 hole CNC machined annular booster are great deal more sensitive to pressure changes, improving fuel flow. Our Q-750-BAN was tested on a 540 cid Big Block Chevy using a ProCharger F-2 supercharger produced a mind numbing 940 lb-ft or torque and 977 HP at only 11 lbs. of boost. (Reference: Car Craft Magazine, [PRIMEDIA Inc.] October, 2005 issue.)
As is this is a great carb. I picked up about three mph over three other very good carbs. buick46270 thanks for the info. The 950 has the same venturi as a 750 so I may be good. Will check with Jesse at Bigs and see what he thinks. At this point I appreciate all thoughts.
I've ran a 750, 850, and my current 950 quick fuel with annular boosters. The 950 gave me the best street manners out of all the other carbs tuned to the same AFR. So from my personal experiance I'd say stay with the 950. While it's not needed to make big power spinning it hard, I think you will be more pleased with the low end of the 950 when not using boost.
Thanks Rich, Good news for me, I love my 950. I suspect the 950 is better than an 850 for boost. Will let everyone know how it works out.
