Project Status

Our affordable ITB kits are still under development for both the Volkswagen 16v and crossflow 8v engines. (VR6 systems are under consideration.) Prototypes have been built for both 4-cylinder engines using throttle body sections sourced from other manufacturers. Tests to date, however, have left us dissatisfied with these options. So, at this time we are designing our own throttles. A target retail price of $1000 is still very much within reach. Plug n' play engine management packages are already developed and await hardware testing.

Incredible Response

Throttle response is greatly improved over single TB designs by placing multiple throttle plates immediately before the intake valves. The air charge must only travel a few inches rather than a foot or more with a conventional manifold.

Increased Horsepower

High-rpm power is greatly enhanced due by eliminating flow-restrictions and special timing of intake air pulses. Upwards of 200hp can be made in all out 16v or even 8v engines. Forced induction ultimately delivers more power for the dollar. However, ITBs are much simpler, lighter, and compact. And, then there's that wicked sound!

Systems Feature:

1. Equal-length intake sections.
2. Straight air paths to intake valves for superior breathing.
3. Intake passages are each smaller in volume, yet larger in total volume. Port velocity is increased for enhanced response and torque. Total flow is increased for maximum horsepower.
4. Velocity stacks can be custom-tailored to match cams. Torque/power peaks can be tuned for a target rpm. A supercharging effect can also be produced within a narrow rpm range.

Increased Bottom-end Torque and Mid-range

Each cylinder fills more efficiently with air/fuel. Greater port velocity and improved breathing means a broader/flatter torque curve across the entire rev range -especially in the midrange. A properly-set up ITB'd engine can be very tractable in "normal" driving while delivering a screaming top end. This is a major improvement over regular manifolds.

Idle Quality

Acceptable idle quality may be retained even with wild cams since individual cylinder's air pulses do not affect adjacent cylinders. Those converting from CIS (Bosch mechanical fuel injection) get a double benefit in that the restrictive airflow meter plates is eliminated.