NTS2KOC Road Test MajorHavoc Headrest Wind Blockers. A wind-breaking analysis. MajorHavoc Headrest Wind Blocker?. A pair of clear lexan sheets Cut to fit behind the “cheese graters” in your headrests. A snap to install Low cost ($20) Nearly invisible. One Minute Installation.
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A wind-breaking analysis.
Literally a snap:
1. Remove headrest backing with a firm tug.
2. Wind Blocker in place. Note four holes for backing snaps.
Note: Blockers are clear lexan, but since we were using “demo” units, we left on the peel-off protective wrap, which looks blue…
3. Backing has four snaps. A firm tap or squeeze reinstalls.
4. Backing back in place, done!
But how can we find out?
Radio Shack Digital Sound Level Meter 33-2055
Honda S2000, MY2000
Stock, 41k Miles
No Boot Cover
Skywatch Meteos SW-3 Elite
Hand-held wind meter
Wind speed meter, 4” from headrest grate*, level with bottom 1/3 of opening
* Approx. equal to distance from grate to back of spouse’s neck.
Data logging sheets
Sound level meter, pointed at headrest opening
For each configuration, two runs were made, one in each direction, to minimize the effects of the prevailing wind.
Ambient temp: 78
Prevailing winds: NNE
Windspeed: 2-18 mph
RPM: 3500 - 4800
Sample of data logging sheet
25 mph and 40 mph runs.
1 mile each way.
GB Highway between Hwy 78 and Renner (Breckenridge)
50 mph, 70 mph and 85 mph runs.
6.25 miles each way.
And now, finally…
Since dB are logarithmic, a 9% reduction (i.e from 82dB to 75 dB) is ~7dB, or ~40% reduction in noise level.
0.5 mph – S2000 @ 40 mph, windows up
1.1 mph – S2000 @ 70 mph, windows up
1.2 mph – S2000 @ 25 mph, windows up
1.4 mph – S2000 @ 85 mph, windows up
1.7 mph – S2000 @ 40 mph, windows down
3.2 mph – S2000 @ 55 mph, windows up (strong ambient gusts); 70 mph windows down
4.3 mph – S2000 @ 85 mph, windows down
6.8 mph – S2000 @ 25 mph, windows down (strong gusts)
10.3 mph – S2000 @ 55 mph, windows down (strong gusts)