Man, Barc, you got here a few seconds before I did!
www.fbthrottlebodies.com Keep in mind DP, the throttle body injection is 2 types, actually 3 but for our discussion here it's 2. The throttle body comes in basically 2 flavors. Electronic controlled TB injection with 3 2barrel injection units and the preferred setup is the air valve throttle bodies with port fuel injection. The difference is the fact that the port fuel contains a fuel rail with injectors that spray a nice atomised fuel plumb at the back of a warm intake valve, very nice power with superior torque production. The other type is an OEM designed throttle body that contains a set of 2 injectors that alternate the pulses inside the throttle body and spray the fuel above the throttle plates like an old archaic carby, sloppy , wet, inefficient. I would NOT use a TB with injectors inside the TB. There will be NO performance gain, tuning is limited due to the alternating sequence of the spray, without getting to technical it sucks and cost a lot of money for very little gain. The truth is the throttle bodies worked well in pickup trucks that operated at low engine speeds and needed a good torquey engine. The TB in my opinion was a carry over engineering project to appease govt. emission regulations instead of developing a superior system like the Multi-Point port fuel injection which is vastly superior because the intakes now only flowed air no fuel. This is a HUGE advantage. The F&B six-pack system looks very nice, it's port fuel injection, the throttle bodies only carry air, has a 8-AN fuel supply line, fits stock type aircleaners according to their site, looks nice flows a lot of air. It will not be cheap. You will need a PCM and someone who knows what they are doing. The fuel system will need to be upgraded to a high flow electric pump,(this is mandatory), large enough fuel lines 3/8 will be fine, F.I. doesnt need the huge lines as a carby and low volume low pressure mechanical pump. A Holley Blue would work fine. It would idle clean, have great torque, make nice H.P. the potential for peak power is the same versus a well tuned race type carby . The REAL benefit is longer engine life, cleaner burn, longer lasting sparkplugs and tune is always good. Fuel Injection makes MORE power under the curve. For competition it's a wash, but for street driving there is NO comparison!!(This is just my opinion only)
Posted: 29 Dec 2008 14:21
Stock sixpacks have a bog going from the cruise to the enrichment circuit. This 'bog' or stumble is tuned away with adjustable jetting as opposed to drilling the outer fixed metering plates. Makes tuning a breeze. I tested mine with a wind band O2 sensor and a LM-1 meter, it runs at 12.9-13.1,,perfect for street/strip.
