Standard Dual-Injector Throttle Bodies Could Tip AMA Superbike Power War In Favor Of New Honda

Standard Dual-Injector Throttle Bodies Could Tip AMA Superbike Power War In Favor Of New Honda

© 2003, Roadracing World Publishing, Inc.

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Copyright 2003, Roadracing World Publishing, Inc.

A new 1000cc Honda sportbike set to be introduced as a 2004 model may come standard with dual-injector throttle bodies.

The Honda throttle bodies are said to be similar to the kit throttle bodies currently run by Yoshimura Suzuki and Attack Suzuki, with one injector located in the conventional position in each throttle body throat and another, shower-type injector positioned over the mouth of each velocity stack.

AMA rules require non-standard throttle bodies used by factory teams to be sold to other competitors at a controlled price, but the dual-injector throttle bodies used by Yoshimura are sold without wiring harness, velocity stacks, black box or software. Purchasers cannot buy the wiring harness, stacks, black box or software used by Yoshimura, and must instead use the aftermarket to source a wiring harness, stacks, control system and software, and then get the parts to work together.

Yoshimura runs its dual-injector throttle bodies using a Mitsubishi control system that is not available to other teams.

Just before Mid-Ohio, after months of effort, Attack Suzuki finally got its dual-injector kit throttle bodies working correctly using a Motec box and software, and gained over 15 horsepower compared to the power produced with the standard single-injector throttle bodies the team used before.

The result was an instant and obvious increase in the performance of the Attack Suzuki ridden by Jason Pridmore, who finished second in both Superbike races at Mid-Ohio.

Because complete fuel injection systems as used by Yoshimura Suzuki were not made available to qualified buyers, AMA Pro Racing is now considering requiring the use of standard throttle bodies only, starting in 2004.

If that happens, the Suzukis would have to run the standard single-injector throttle bodies and give back the power gains realized with the dual-injector system.

If the new Honda does come with standard dual-injector throttle bodies, it could have an immediate horsepower advantage over the Suzukis at the start of the 2004 AMA Superbike season.

Stay tuned.

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