SF Intake Air Box Testing
We’ve had a few requests for us to post data regarding some testing we’ve performed on our SF Intake Air Box for the Subaru WRX/STI. I think the results state pretty clearly how much an air box helps with keeping Intake Air Temps in check.
Highway Driving:
COBB SF Intake no box: Max 124 degrees F Avg. 91.6 degrees F
COBB SF Intake w/ box: Max 108 degrees F Avg. 74.9 degrees F
Difference of: Max ~16 degrees F Avg. ~16.7 degees F
City Driving:
COBB SF Intake no box: Max 149 degrees F, Avg. 117.4 degrees F
COBB SF Intake w/ box: Max 111 degrees F, Avg. 87.5 degrees F
Difference of: Max ~38 degrees F, Avg. ~29.9 degrees F
Idle (~5 mins):
COBB SF Intake no box: Max 149 degrees F, Avg. 133.5 degrees F
COBB SF Intake w/ box: Max 113 degrees F, Avg. 99.2 degrees F
Difference of: Max ~36 degrees F, Avg. ~34.3 degrees F
All measurements were taken from the factory IAT sensor located in the MAF sensor. This is exactly what your ECU uses to determine how much timing to pull, boost compensations to make, etc. Not to mention the basic fact that cooler air = more, reliable power.
I was wondering how the temperature compares to the stock airbox.
What are the temps with the stock air box setup?
I wonder how that compares to a stock factory airbox
I’ve just purchased an APS DR525 fmic for my 02 WRX wagon & I know I’ll need a short ram intake; will this airbox and the SF intake work with the APS front mount? Or does the routing of the ic piping conflict with the box?
My stock intake runs about 86 degrees on the interstate and around 95 at idle(according to my stock MAF reading), if you are not planning on exceeding 325 BHP then the stock intake is the way to go. I have been running my stock intake with cobbs stage 2 catless HWGY map, i just bought a VF39 turbo with supporting mods and decided to go with the Cobb intake and box, the temp is a little higher then stock, but it can flow more then 325 BHP, and if the temp scares you, just run meth injection 😉
Thanks for posting the test results very useful info.
I am thinking of the short ram w the box. I have a larger top mount and a 16g under the hood, cobb accessport,and catless tbe. Will I actually benefit with this or am I better off with the stock airbox for now? Im trying to build horsepower but run it efficiently. Its a daily driver. NYC
WRX 05′