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ken800 · 05-10-2003, 07:37 PM

upate:

First, I plugged the ram air tightly with a towel so no air could get in... I went out of my neighborhood at full operating temp. 10-15mph for about 6 blocks. 40mph for about 3 miles to the interstate. 60mph for about 3 miles. Turned around and did the same course coming home without the towel stuffed in the ram air. Temp outbound was 91 degrees, coming home it dropped by 1 degree to 90. Here is what I got:

lowest leaving the neighborhood about 111. Going 40mph toward freeway, lowest I got was 106 degrees. I stopped and let it climb to 127 degrees and then did a 1/4 mile or so at 40mph and it only dropped to 118 degrees in that short run. I then jumped on the freeway and did 60mph for about 3 miles. In a minute and a half, it reached 109 and had a low of 108 degrees. That's 17 degrees over ambient with the towel in place. I stopped and pulled the towel and started the opposite direction on the freeway. I was at 122 when I took off. In 19 seconds I was at 109 degrees. (it took 1.5 mins with the ram air blocked). I reached a low of 94 degrees coming back down the freeway. That's 14 degrees cooler on the freeway with the ram air unplugged... The 40 mph trip back down the back road for about three miles saw a low of 102. Returning in the neighborhood I saw a low of 108.

So, it appears that the ram air setup on JL's box does keep intake temps cooler. It brings down temps pretty quick at speed though the ram air is not as effective at low speeds as expected...

It also seems to depend on how long the engine compartment was sitting and being heated as to how fast and how close to ambient the box can get. If I run the truck all over town and then let it sit, intake temps climb very quickly and take longer to come down. If I just wait until the engine comes up to full operating temp and then take off, intake temps rise slower and peak lower. The interesting part of this test is I did the blocked ram air on the way OUT which means the engine compartment was less heated than the return trip. The return trip showed lower intake temps and faster cool downs with the ram air functioning.

This test was done around 6:30PM and the hot sun wasn't superheating the concrete I was driving on.

Next up is the stock airbox. First, I need to find a K&N panel filter to run in it. After the pure stock airbox, I'll cut a hole and run a hose and test again just to be sure, but the hose will be run to the outside of the engine compartment.

stay tuned...

05-10-2003, 07:37 PM	#14 (permalink)
ken800 Maximus Horsepowerus Join Date: Feb 2003 Location: Houston, tx Posts: 1,858 View this user's gallery iTrader: 0 / 0%	upate: First, I plugged the ram air tightly with a towel so no air could get in... I went out of my neighborhood at full operating temp. 10-15mph for about 6 blocks. 40mph for about 3 miles to the interstate. 60mph for about 3 miles. Turned around and did the same course coming home without the towel stuffed in the ram air. Temp outbound was 91 degrees, coming home it dropped by 1 degree to 90. Here is what I got: lowest leaving the neighborhood about 111. Going 40mph toward freeway, lowest I got was 106 degrees. I stopped and let it climb to 127 degrees and then did a 1/4 mile or so at 40mph and it only dropped to 118 degrees in that short run. I then jumped on the freeway and did 60mph for about 3 miles. In a minute and a half, it reached 109 and had a low of 108 degrees. That's 17 degrees over ambient with the towel in place. I stopped and pulled the towel and started the opposite direction on the freeway. I was at 122 when I took off. In 19 seconds I was at 109 degrees. (it took 1.5 mins with the ram air blocked). I reached a low of 94 degrees coming back down the freeway. That's 14 degrees cooler on the freeway with the ram air unplugged... The 40 mph trip back down the back road for about three miles saw a low of 102. Returning in the neighborhood I saw a low of 108. So, it appears that the ram air setup on JL's box does keep intake temps cooler. It brings down temps pretty quick at speed though the ram air is not as effective at low speeds as expected... It also seems to depend on how long the engine compartment was sitting and being heated as to how fast and how close to ambient the box can get. If I run the truck all over town and then let it sit, intake temps climb very quickly and take longer to come down. If I just wait until the engine comes up to full operating temp and then take off, intake temps rise slower and peak lower. The interesting part of this test is I did the blocked ram air on the way OUT which means the engine compartment was less heated than the return trip. The return trip showed lower intake temps and faster cool downs with the ram air functioning. This test was done around 6:30PM and the hot sun wasn't superheating the concrete I was driving on. Next up is the stock airbox. First, I need to find a K&N panel filter to run in it. After the pure stock airbox, I'll cut a hole and run a hose and test again just to be sure, but the hose will be run to the outside of the engine compartment. stay tuned...