searched... all i found was one proved no effect
wiki has no documented test results
show me
http://ecomodder.com/wiki/index.php/Warm_air_intake
no documented results
http://www.metrompg.com/posts/wai-test.htm
Observations & conclusions
The grain of salt: the margin of error for the CAI group is +/-0.17 km/gal; for the WAI group it's +/-0.42 km/gal.
For this car, under these specific test conditions, the difference between the WAI and CAI averages is so small as to be statistically insignificant. (And even if it was statistically significant, practically speaking there's no difference between 79.12 and 79.31 km/gal
http://ecomodder.com/forum/showthrea...ins-16212.html
Run with Cold:
1. 38.5
2. 36.5
3. 36.4
4. 37.1
5. 35.6
6. 36.0
Average: 36.68
Run with Hot:
1. 37.0
2. 36.8
3. 37.0
4. 34.8
5. 36.4
6. 35.1
Average: 36.18
A .5 mpg decrease overall at 45 mph. While this would be acceptable if there was another benefit, there isn't. The power is NOTICEABLY gone from the engine. With the hot air intake, its choked.
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i guess i was wrong heres 2 tests not carried over to the wiki both say WAI ineffective