Bruce Nunnally Posted February 19, 2004 Report Share Posted February 19, 2004 While I have the May GM HTP mag open, also want to mention that they tested 7 different custom airboxes on a 2000 Z28, both on the dyno and at the track. They seem to have followed a very reasonable methodology for testing -- even going to the relative extreme of using a 'locked down' PCM to avoid PCM learning from test to test. The stock airbox made 314, 319, and 321 hp on three pulls. The best dyno replacement lid made 331, 330, and 330 hp on three pulls. The stock best quarter was 13.12s at 108.6 mph corrected for atm. The best track replacement lid did 12.92s at 110.05 mph corrected. I know, 1 mph in the quarter does not SEEM significant, but it does equate to about a 10 hp change. In summary then, just changing the airbox yielded about 10 hp on this mostly stock LS1. Why didn't the factory build the camaro airbox lid that if it was just that simple -- these aftermarket lids are $89-149 retail, so say On a related topic, I was reading a similar review in a tuner mag where they tested a variety of intakes, and did a nice summary. They tested each intake 3 times on a dyno, and published the best time for each. Massive test time. One of the intake suppliers was upset with the result -- they did not win the comparo -- so they duplicated the test with the mag's example car. The supplier got the same results they had been getting in their own tests -- that their intake was superior. So what was the problem? The magazine and the supplier used slightly different tests. The supplier tested on the dyno with hood up, to simulate cooler air flowing in like when the car is moving. The mag tested on the dyno with the hood down. The supplier used an average of 3 runs. The mag used the best of 3. Different results, same parts. Moral of the story, it just depends on who is telling the story sometimes. In this case both parties were right, but under different conditions. But also in that case, all the custom intakes outperformed the stock intake. Also in that test, a drop-in panel filter did no or negative gains. Bruce 2016 Cadillac ATS-V gray/black Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
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