Integra GSR VTEC 4 Throttle


Acura Integra GSR VTEC 4 Throttle


Featured in the February 1994 issue of CARBOY, a Japanese car enthusiast magazine, this car was modified with 4 individual throttle bodies. CARBOY featured the vehicle because of the unique induction set-up for the VTEC engine.  (That issue was dedicated to U.S. Tuning of Japanese vehicles.)  The Honda VTEC engine design was introduced at the same time Toyota introduced the 20Valve / 4Throttle 4AG.  We anxiously wanted to find the tuning potential of the variable cam timing design, and there were no U.S. Toyota models.  A custom intake was fabricated to align perfectly the throttle bodies into the intake ports.  An Electromotive Tech II was used to easily program different fuel and ignition curves- and also to test (and learn!) the affectivity of VTEC technology.  To fully document the results the engine was not modified.  To assure affectivity and complement the state-of-the-art intake, DC headers and an HKS exhaust was used.  The result was a dramatic increase in throttle response- off idle, part-throttle, and past the redline.  A Formula 2, screaming engine!!  The 4-Throttle set-up proved a definite performance upgrade to the Honda engine, but was very expensive, more than a turbo kit.  In retrospect, the Toyota 20Valve 4Throttle set-up, introduced in Japan a few months earlier was short in HP! (and 200cc) and did not have a variable lift.  The new Celica 2ZZGE engine finally catches up, a “little” late- 9 years, but at least in the same decade.

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