HOT FILM versus AIR FLAP

The vital differences in design which make all the difference to performance ....

CONVENTIONAL AIR FLAP SYSTEM

An examination of an air flap unit reveals a fairly convoluted air path, not ideal for smooth air flow, in addition to which the air has to push open the flap so hindering speed of flow. Our measurements prove the Bosch hot film unit (see below) to be 30 percent more than the equivalent air flap unit. Our rolling road tests have demonstrated that Porsche 911, 3.2 and 3.6 models made more power and torque when the air flap was replaced by a hot film unit.

Hot Film control v. Air Flap control

HOT FILM SYSTEM

Air flow through the Bosch hot film unit is straightforward and unhindered. However, the output signal characteristics of hot film are different to those from an air flap, hence our FilmStar microprocessor interface unit, which translates the film sensor signals into their air flap unit counterparts, with the correct dynamic range and compatible with the car's E.C.U.

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