Here is the first test of using my homemade air intake cold air box.
The test was versus the box and stock air intake, and measuring the Intake Air Temp (IAT) via a ECM diag tool that recorded and stored the results.

Outside air temp was 72 degrees for both tests and was from engine dead cold to driving the car at about 65 MPH and just hitting normal operating water temps.



As you can see with the cold air box the IATs were about 30 degrees cooler.

Without the box, leaving the air filter in stock position but with a hole cut in the shroud that seperates the filter from cooler airflow the IAT was about the same as with airbox on, but engine seemed to surged once in ahwile.

Next tests will be at high speed.

John

With the continued testing of the LS6 intake and my home made cold air box for the Donaldson airfilter, it became clear that the PCM was having an issue with the colder and increased airflow.

Using the procedure in the do it your self section of the C5 Forum by Craige and purchasing a MAF translator I was able to better the air/fuel issues.

Using a PCM diag tool I found that when engine was at WOT, it was running a bit rich but when not in WOT was running 8 percent lean.
By using the Translator, making tuning adjustments with it and then by tracing the PCM while driving I was able to dial in a better air/fuel condition as seen below



As can be seen on the left image, that the average of Banks 1 and two ( both heads) the long term fuel cells reported about 8.6 percent lean when not in WOT.
The image on the right shows after my tuning with the translator a average of 0.775 which is about as good as it gets ( zero would be perfect)

Both images show that now the WOT condition needs a bit of tuning since best operating of O2s under WOT would be between 890 and 900 mVolts, thus right now it shows a bit rich.
Best case would be to get on a chassie dyno that uses a wide band 02 and tune via what is seen in the exhaust.

In the end the translator gives you the freedom of tuning whereas a modified MAF would not when it is needed under different climates or driving style.

John