As expected, the throttle-body...
As expected, the throttle-body throat is blended to aid airflow; each throttle is 62 mm in diameter. Besides the TPS and throttle-actuator motors, the BBK throttle body reuses the stock mounting hardware as well.
During throttle-body installation,...
During throttle-body installation, the stock actuator motor and TPS are fitted to the BBK casting. A small spring in the actuator motor needs to be properly clocked to the throttle shaft, which is easy with a set of needle-nose pliers.
To see if the air/fuel ratio...
To see if the air/fuel ratio changed with the BBK parts during the dyno test, this air fuel meter was rigged into the test car. As expected, it hovered amazingly close to the mid-12s the entire time.
All testing was done on Brothers Performance West's in-house Dynojet chassis dyno. The subject car was BBK's in-house '05 GT, which was otherwise stock. Three runs were made in each configuration, and these are the best examples of each run (which varied little). Individually, the throttle body tested slightly better than the cold-air kit, but both offered about the same improvement over stock. Both worked over the entire rpm range, and together they formed a solid 20-plus-horsepower gain at the peaks and more up top. No electronic tuning was attempted; experience has shown it would also help considerably
Ever notice how everyone "drives"...
Ever notice how everyone "drives" on chassis dynos? We suppose it's best to be prepared if the straps come loose. Bryan Rogers, BBK's product PR guy, prototype tech, and a great comic impersonator, is doing the driving here. If you really want to be jealous, he managed a strip club for several years but tired of the scenery and traded it for underhood delights.
Now here's something the old Two-Valve GT engines could have used-an intake manifold cover-up. Serving no other purpose than to improve the Three-Valve GT engine's looks, the BBK decorative intake plenum cover is offered at $199.99 in silver powdercoat as seen here, or $249.99 with a chrome powdercoating treatment. Installation is simple using four intake manifold bolts, and it can't leak!