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That depends.....if you are cruising on the highway at 80 MPH, the intake air temp will be 90-100F. However, if you stop at a traffic light for 5 minutes, your intake air temp could easily reach 140+. Then, even after driving again on the highway, that temp will decrease to no less than about 120F after 15 minutes. During this time when your temps are over 110, the LS1 is down 10+ HP.
By contrast, a Cold Air Intake will keep the intake air temps down below 100 almost immediately after leaving a red light.
The next time you see a Chevy SSR, take a look at the opening in the front end. That opening allows outside air to blast in directly at the air filter. That's CAI and every vehicle should have it from the factory.
On my kit car (in my avatar), I put in a LS1. the air intake is currently sitting behind the radiator, and intake temps suck (160). I'll be putting a duct in to get cold air to it. I just wanted to know how bad they were compared to a production application. Looks like there are quite a few horses for me in there.
If you have automatic climate control with an outside temp sensor, you can make an extension wire so the sensor can be placed anywhere inside or around the intake and watch the temp reading from inside the car while you're driving. The dash readout will go up to 150 degrees, then it craps out.
I used Car Chip. First, you set up the types of readings you want to log. In my case, coolant temp, vehicle speed, intake temp and elapsed time were measured. You then plug the CC into the OBDII port (under the instrument cluster). The number of data types, days driven, and frequency of data collection will determine how long you can collect data. When you are done, download and print the data.