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Looks intereseting, I wonder why you didn't relocate the TB closer to the plenum (even attach it right to it), it should help the engine response a lot, kind of like ITBs but not to the same extenent.
Ther eis very limited space under the hood. THe TBs are going to have be some distance away from the plenum for clearance issues. It would take a mighty tall cowl hood to cover everything up if the TBs were bolted straight to the plenum.
I just got back from the dyno testing the twin throttle body set up for the second time, sometimes I just hate this car.
While there do seem to be some gains to be had from a less restrictive or a larger intake/throttle body system, it seems it would be better to research utilizing a larger single throttle body. The twin set up would be cost prohibitive based on the gains we saw on the dyno and the cost to perfect such a setup not only for driveability but fitment as well. Not to mention what it would cost to produce and market.
Finally, the results: I got approx. 10 horsepower and 8 ft/lb of torque.with the twin TB setup based on today's dyno. There was a little problem with the air fuel ratio throughout the test, and it seemed throttle body motor #2 malfunctioned towards the end of the test.
So in conclusion, I don't think 9 to 10 hp is worth all the work and expense it would take to pefect this type of system.