Confusing dyno numbers
Thread Starter
Melting Slicks
Joined: May 2014
Posts: 2,611
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Confusing dyno numbers
I've been adding so small bolt-ons and running on my friends dyno and am confused about some of the results. Back in April, on a cool night, (47 degrees), we tuned my stock C7 with an AIR RAID drop in filter. Baseline before tune, (but with filter) was 423, after a limited tune with EFI-LIVE (not all the tables are available), we hit 440hp and 441tq. This was the corrected number. (453hp, uncorrected). Same dyno, different day, (yesterday) we threw her back on. This time I was running the AFE cold air intake which was installed about a month ago. This dyno run was on a much warmer day (but not summer hot) at about 72 degrees. My tuner figured the car was going to run lean because of the additional airflow from the AFE and it was lean at about 14:1. After correcting the a/f ratio down to 12.5:1, we had lost power from the earlier run. Power was down to 423hp. Can the increase in air temperature and the increase in AIT sucked into the engine account for such a decrease in HP? 
