Objective analysis of cabin noise solutions

Rui Z

From Edmund's InsideLine

Nismo 370Z Test Results:

Test Results:
0 - 30 (sec): 2.1
0 - 45 (sec): 3.6
0 - 60 (sec): 5.3
0 - 75 (sec): 7.7
1/4 Mile (sec @ mph): 13.6 @ 103.2
0-60 with 1-ft Rollout (sec): 5.1
30 - 0 (ft): 28
60 - 0 (ft): 115
Slalom (mph): 70.4
Skid Pad Lateral acceleration (g): 0.91
Db @ Idle: 47.1
Db @ Full Throttle: 84.8
Db @ 70 mph Cruise: 72.9

370Z Touring Test Results:

0 - 30 (sec): 2.0
0 - 45 (sec): 3.5
0 - 60 (sec): 5.2
0 - 75 (sec): 7.6
1/4 Mile (sec @ mph): 13.5 @ 103.7
0-60 with 1-ft Rollout (sec): 4.9
30 - 0 (ft): 26
60 - 0 (ft): 108
Slalom (mph): 72.0
Skid Pad Lateral acceleration (g): 0.94
Db @ Idle: 49.2
Db @ Full Throttle: 82.7
Db @ 70 mph Cruise: 70.3


Compared to

Mercedes C350 Test Results:

Test Results:
0 - 45 (sec): 4.0
0 - 60 (sec): 6.2
0 - 75 (sec): 9.0
1/4 Mile (sec @ mph): 14.5 @ 96.5
30 - 0 (ft): 30
60 - 0 (ft): 118
Slalom (mph): 67.6
Skid Pad Lateral acceleration (g): 0.83
Db @ Idle: 43.3
Db @ Full Throttle: 75.8
Db @ 70 mph Cruise: 65.2

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sonic370

finally some common sense reasoning.............

SeattleLion

These results are interesting but unfortunately not too helpful. We don't know what sort of road surface was involved or where the measurement was made. Assuming that the Edmunds results are consistent between cars, the touring Z was about 5 db louder than the Mercedes. That would be around 25% more noise.

What I was hoping we could do is get the difference in the same car of the noise level before and after sound treatment. With that data, members could compare solutions versus cost, etc. and decide what, if anything they want to do.

Rui Z

Actually, it is useful information. I'm sure edmunds used more professional equipment then an iphone app, so we need to compare their numbers to the decibel you get from an iphone app. If it's not close to the edmunds numbers, then that means there is alot of muffling going on with the iphone or whatever other device you are using. If there's too much muffling, you will not get an accurate measurement of noise level difference for before and after sound treatment.

Like I suggested before, you should look into what Nissan did as their road noise fix for the 2011 model.

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