Wired a thermocouple under the hood today and went for a drive. I was surprised by the results.
My probe was placed about 3 inches in front of my HKS filter, and wired back to the dash where my multimeter was propped up.
Ambient air temps ranged from 68°-72°F over the course of my 20 minute drive.
While the car was still warming up, I saw the same temperature under the hood as outside the car- not surprising.
After the car was warmed up, at any speed over 15mph, under hood temps at the intake were never more than 8-10°F over ambient providing you had clean air.
The crazy part was how fast temperatures would rise at a standstill. Waiting 20 seconds at a red light would bring under hood temps up as high as 135°. Fortunately, once you broke the 15mph barrier, temperatures would plummet as fast as they had climbed.
Drafting would raise under hood temperatures an additional 5-10°F over what I was seeing under clean air driving.
This is nowhere near the results you'll see on AudiWorld relating to before/after testing of Schwings cold air intake. I believe the differences are car to car related. I don't know what exactly his setup was, but I can tell you what you'll find modified on my car.
My probe was placed about 3 inches in front of my HKS filter, and wired back to the dash where my multimeter was propped up.
Ambient air temps ranged from 68°-72°F over the course of my 20 minute drive.
While the car was still warming up, I saw the same temperature under the hood as outside the car- not surprising.
After the car was warmed up, at any speed over 15mph, under hood temps at the intake were never more than 8-10°F over ambient providing you had clean air.
The crazy part was how fast temperatures would rise at a standstill. Waiting 20 seconds at a red light would bring under hood temps up as high as 135°. Fortunately, once you broke the 15mph barrier, temperatures would plummet as fast as they had climbed.
Drafting would raise under hood temperatures an additional 5-10°F over what I was seeing under clean air driving.
This is nowhere near the results you'll see on AudiWorld relating to before/after testing of Schwings cold air intake. I believe the differences are car to car related. I don't know what exactly his setup was, but I can tell you what you'll find modified on my car.
- I don't run with the plastic belly pan (more airflow)
- I have no seal/trim across the top of my firewall. I'd assume this provides a small amount of cowl induction. (more airflow)
- My battery is relocated to the rear, freeing up more space under the hood (more airflow)
- Car is significantly lowered, and raked forward. Assume modified airflow.
I'm make believe
There was a simular test done with a basically stock underhood (even airbox) and the temps never changed anymore than what you posted. I have stated all this to people for a long time now. If i can find the thread, i will post it. Glad there is now FINALLY a handful of people ?'ing steves claims and posts.
It's always a bunch of talk and never any hard data. Hearsay is only that, and I'm not one to believe something just because someone on the internet says its true.