Alpine A110 wind noise / buffeting with window slightly open

[Franzino]

When driving with one window fully open or even a little open; do other A110 owners also experience a lot of wind noise and buffeting inside the A110? This is already at really low speed (40mph). It's night and day difference with my M2 (if I drive with the window a bit are fully open). When driving at low speed there almost no noise in the M2 and it's so noisy in the A110. It seems this car is not made to drive (al low speed) with the window open or slightly open. I tested with both sides of the A110 window, bot make equally the same wind noise and buffeting.

[Miserablegit]

If you partially open the window opposite the one you have opened it reduces the buffetting significantly.

[Franzino]

Miserablegit said:

If you partially open the window opposite the one you have opened it reduces the buffetting significantly.

Indeed. this seem to work...but I never have to do this in my other small sportcars. Do you also have A110?

[Miserablegit]

Yes I have an A110.
I put the buffeting down to the particular aerodynamics of the car with the open window affecting the airflow. The opening of the other window equalises the flow-induced pressure in the cabin. I think.

[Prestonese]

The air coming into the cabin has little space to dissipate as there's a piece of glass / perspex (?) between the cabin and the engine. Similar issues in the MX5 RF although that is designed for open air driving!

This differs to the Cayman where the same area is open and carpeted.

[blueg33]

Its pretty common on most aerodynamic modern cars. IIRC its to do with detaching the laminar airflow

[Franzino]

Miserablegit said:

Yes I have an A110.
I put the buffeting down to the particular aerodynamics of the car with the open window affecting the airflow. The opening of the other window equalises the flow-induced pressure in the cabin. I think.

Thanks for there info; I was afraid the issue was something on our Alpine only

[Franzino]

blueg33 said:

Its pretty common on most aerodynamic modern cars. IIRC its to do with detaching the laminar airflow

Did not know this...

[blueg33]

Franzino said:

blueg33 said:

Its pretty common on most aerodynamic modern cars. IIRC its to do with detaching the laminar airflow

Did not know this...

Info here - Its called Helmholtz resonance

Click

My son is an acoustic engineer - I asked him too and he pointed me to this paper (the full on technical stuff)

Tecnical Stuff

Its also the way wave ported speakers work

Edited by blueg33 on Thursday 23 April 17:05