Oh yes....finished the sound proofing job over the long
holidays.
Did up the entire whole car. Roof, bonnet, engine firewall,
tailgate, spare tire cavity, doors, etc. The whole works! Boy was
it tiring, whole body is now sore!
The sound isolation is now perfect! Quiet bliss in the car at low
cruising speed.
However at high speed(>80km/hr), the wind noise and tyre roar is
getting more obstrusive.
My conclusion is that noise isolation can only be isolated partly
by the soundproofing mats.
To have a totally 'quiet' car, the car structural design will have
to strong to resist resonance in the design phase (obviously Nissan
March as a budget small car, do not consider such matters while in
the drawing board, unlike Lexus/BMW/Mercs)
Ok....now for the next phase.....the Performance Mod!!!
