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Ok folks ... I finally found some free time to analyze some of the data I have been collecting from the truck before and after installing the K&N GENII kit. In the next few weeks, I will be analyzing things much more carefully (weather/time permitting) and I will also have numbers when I get my exhaust upgraded.

Here's the setup. For sensor data, I use Autotap (connects laptop to OBDII). For 0-60 numbers I use a RaceTech AP-22 Accelerometer. The results are by no means exact, and mostly they are for my own enjoyment. So don't put too much weight in what I am posting here

I have a couple of spots where I do 0-60 runs (freeway on ramps). So the 0-60 numbers are only for relative comparisons (before and after mods). One of the on-ramps is slightly up-hill, the other slightly down-hill.

My 0-60 did seem to improve, but not by much after the K&N. On the down-hill ramp, I improve by about 1% to 4% (9.9 to 9.5), on up-hill by as much as 10% (12.86 to 11.43). Although this is averaged over a few tries, I am going to have to run a few more times over the next few weeks to get a better idea. The following plots show the readings from the MAF sensor and the normalized speed/rpm curves for two 0-60 runs (one on each ramp) before and after K&N. As you can see, MAF readings are almost identical but when I compare the data, on average, after the K&N there is definitely more air flow (the peak is higher) but not enough IMO to make too much of a fuss about.

Here I have normalized the RPM and speed to see relative behavior. My max speed was 70 MPH and RPM peaked at 5000 so you can get a rough idea of what the graphs mean.

The most amazing thing I noticed was the intake air temperature. This is just unbelievable !!! As you can see, the intake air temperature slowly goes up with the stock airbox but oscillates with the K&N; Gets a little hotter when I am pushing the engine but cools back down when the load is gone. I think this by itself is pretty damn cool.

The intake air temp graphs are for the whole period I was collecting data. If you look at the time-index (x-axis), you can see that I was pushing the engine from 350-450 and from 550 to 650 with the K&N when doing 0-60s. The temp goes up then around the intake but when I take it easy, it cools back down. With the stock intake, the temp goes up around time index 500 but doesn't come down.

Now I forgot to mention that with K&N, the outside temp was 43 degrees and when I was doing stock tests it was about 65 degrees so that may have made a difference (also for the 0-60 numbers). But I think this shows that K&N stays cooler than stock for some reason ... maybe their heat-shield is the reason?


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