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* Throttle Body:
Many people liked the look of the Enderle or BDS “bug catcher”. But these flow so much air that it’s hard to get a stable idle RPM because of butterfly sealing and inconsistent idle return. Also, the tip-in just off idle can be hard to control because the increase in airflow is dramatic with a very small change in throttle. For a street driven car at least one port should be totally blocked off.

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Testing:
1) We ran several tests with Roots blowers with fuel delivery only above the blower, and found that the rotation of the rotors can bias the charge causing inconsistent cylinder charge at low and mid RPMs. Also we found an airflow bias toward the front of the engine.

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On the setup I'm putting together I was hoping I could use the Hilborn shotgun injector hat directly on the blower, but I was indeed wondering how those 2 large valves could manage off-idle and part-throttle situations.

Any solutions to this issue? Perhaps mounting flat-ish valve-bodies between blower and hat, does something like that exist??

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Yes, you can hold the timing and the fuel back a little so its not like an on/off switch. I run a bug catcher normally aspirated on my Hemi, and it was very touchy. I have two programs. One that gives it what it wants "race program" and one that holds back a little "street program"...Made the car a lot easier to drive.

I have also seen, for the Big & Ugly injectors, an adjustable mechanical throttle linkage that allows each hole to be opened at different throttle postions like a dual quad linkage with a slider adjustment...I have pics of it somewhere.

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Did you find a flow bias to the front cylinders during low loads/normal driving ranges or just when the blower started really working and cranking out the boost?

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On the setup I'm putting together I was hoping I could use the Hilborn shotgun injector hat directly on the blower, but I was indeed wondering how those 2 large valves could manage off-idle and part-throttle situations.

Perhaps mounting flat-ish valve-bodies between blower and hat, does something like that exist??

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Do you think this would also be the case with a pure gaseous fuel like Propane?

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Cool. I couldn't see from the pics if the plates were still on one shaft. Very creative solution even if the mechanics look like something that should be on "Mythbusters"

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great topic,,,im just now starting to research this for my street driven cruise nite ...car show blown 340 66 barracuda,,ide like to get rid of the carbs,,way to rich in my opinion,,,,and a hat style injector may get less attention at state inspection,,,

i dont race it just drive it and have fun,,,where can i look for information on a set up that would work for me,,,,thanks

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I love the bug catcher set-ups on blowers...They have about the lowest profile you can get, and they look awesome. Go with what Rich says on the injectors above and below, and you will be very happy, just lighter in the wallet.

I especially like the self learning feature and will be putting my Classic FAST up for sale this weekend to upgrade to XFI 2.0....

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hey thanks for the quick reply,,to run injectors below the blower i would have to have the powder coating stripped off, and bungs put in the runners,,,small block blower intakes are hard to come by,,,,but thats not a problem,,im wondering if i would need them below vs just above the blower for this mild set up,,, any info is great, and thanks you,,, your motor looks killer,,,is that a sheet metal type intake ??

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