RE: Welcome F&B Performance!!
Powerdyne Supercharger applications can see quite a bit of improvement with a high flow throttlebody provided the system tune is good and you can adjust it a bit. Higher flow capacity throttle bodies reduce the back pressure on the supercharger, increasing the efficiency. They also reduce the manifold vacuum earlier in the throttle "swing" (lower TPS value), which increases the enrichment rate if all things are in tune... downside: A high flow TB can change the point in the TPS swing where the Map sensor "tops out". In a Powerdyne set-up (box stock?) you do not have a two bar map, so the factory MAP sensor only reads vacuum. This can lead to bucking or surge during the mid throttle transistion. A bit more (or less in some cases) fuel usually compensates until you get into open loop control. F&B Throttle bodies are designed for supercharged trucks. To improve air hat seal and reduce leakage, we machine in a full perimeter seal ring with our "wave" seal surface to help gently bite into the gasket face to avoid squirm. (dang, I sound like a TV ad...) We also include our billet seal nut to seal around the air hat hold down bolt. We also offer our RZ mount that eliminates the wimpy bent all thread most kits seem to end up with To take advantage of this, you need to remove the plastic protrusions in your stock air hat "outlet" that keep it from being a full 5" circular hole. A dremel tool or jig saw works great. Its worth it since a better seal usually gives more boost! With properly tuned Powerdyne systems weve seen up to 25HP (stock intake manifold) stepping up from an F&B 2x50mm to an F&B 2x52mm TB. It does depend on your current build (exhaust, motor condition etc. etc.) and your current system's "tuneability". Mileage also depends on this as well! If the moons are aligned properly and your running too rich now, a larger TB "may" help your mileage...My foot is always too heavy to tell... Weve found good HP and torque gains when running our 2x55 and 2x58mm TBs on the b***er centrifugal systems, even in un-stroked applications! The stock intake manifold becomes the restriction pretty quickly at higher boost and volumetric efficency levels! The list price is $475.00 +9.00 shipping (money back guarantee!) but you can usually find em cheaper at my distributors or by calling us directly... kinda long winded...
Bruce
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