Here's a real informal test on a Delco UPF44, K&N 1007, and Baldwin B31.
After reading lots of comments on the Delco UPF44 being restrictive I decided to look at oil pressures on my car with as much control as I could come up with given I'm not in a lab. All these readings are with new oil on a C5 Corvette. The oils was at 210 deg F and I was taking the readings at 1700 RPM in 6th gear.
Delco UPF 44 32 lb PSI
K&N 1007 40 Lb PSI
Baldwin B31 38 lb PSI
I decided to stick with the Baldwin. They are built like tanks and other tests seem to show that it filters better than the K&N. For my car the Baldwin seems to hit the sweet spot between flow and filtering. I'm sure there are a lot of good ones out there but I really want decent flow, given my car sees a lot of roadcourse. Thanks to Patman for talking me away from the Delco UPF44!
After reading lots of comments on the Delco UPF44 being restrictive I decided to look at oil pressures on my car with as much control as I could come up with given I'm not in a lab. All these readings are with new oil on a C5 Corvette. The oils was at 210 deg F and I was taking the readings at 1700 RPM in 6th gear.
Delco UPF 44 32 lb PSI
K&N 1007 40 Lb PSI
Baldwin B31 38 lb PSI
I decided to stick with the Baldwin. They are built like tanks and other tests seem to show that it filters better than the K&N. For my car the Baldwin seems to hit the sweet spot between flow and filtering. I'm sure there are a lot of good ones out there but I really want decent flow, given my car sees a lot of roadcourse. Thanks to Patman for talking me away from the Delco UPF44!