[ACEL]

From my hypothesis and observation of recent cars, the convex front may be adapted to some older cars.

Why what is good for newer cars could not be used on older cars?

So, here is a mock-up built with plastic quarter round and some tape.





The air pressure was measured in front of the mouth air intake with a digital air pressure meter that is generally used for building ventilation systems.





Simultaneously, the top speed reached at a given throttle stop was monitored and recorded with the Android Torque App through a ELM327 OBD2 Bluetooth adapter.

The mocked-up modification allows for a light increase of 0,1 inch of water in air pressure at the air intake mouth. At the same time, the car speed increased about 1% at 104-105 Km/h and 17,65 % throttle opening. There was no measurable fuel economy realized. Still, there seems to be some improvement worth pursuing the experiment.

A second series of test was conducted with a more elegant "lip" acquired from the commerce.





The results are better. Pressure at the air intake mouth was about the same as with the mock-up. Speed increase at a given throttle opening varied between 2 (104 km/h reached) and 6 Km/h (114 Km/h reached) while fuel consumption reduced by 0,1 L/100 km (during the tests at 5,6 L/100 instead of 5,7 baseline before the mock-up mod).

This modification is beneficial and becomes permanent.

Cheers!