Small K&N cone filters: How well do they flow?

[gaylantvr4]

I though K&N rated their filter for horsepower

[RealMcCoy]

I though K&N rated their filter for horsepower

Not anywhere I've seen... If so, I'd like to see it.

K&N part RU-3590 information

[mb7050]

according to K&N Product Engineer Patrick Jacobs RU-3590 flows around 367cfm

[RealMcCoy]

according to K&N Product Engineer Patrick Jacobs RU-3590 flows around 367cfm

Is that published somewhere? or did you have to ask someone..?

If that's the case, I'm back to looking for filters...

[mb7050]

I asked

[RealMcCoy]

I asked

OK, well thanks for the info, that's a big help making my decision.

[RealMcCoy]

I don't know why Adam's post disappeared, but it touched on a subject I wanted to explore... according to K&N, they rate filters at 1.5 inches of vacuum. K&N Airflow Testing Procedure

That's pretty typical, carburetors are rated the same... but that's also why we used to run 2300 cfm of carb on a race car that couldn't flow half that. 1.5 inches is a huge restriction... if you're going to pull a race motor to that high of a vacuum, you may as well stuff a potato in the tailpipe while you're at it...

If those filters flow 370ish cfm at 1.5 inches, then I guarantee they're slowing your turbos down doing it.... kinda sounds like my original thinking wasn't that far off...

[Toni]

So what kind of horse power would these filters support? I tried to find some calculators but realized I don't have enough information to use them.

[sergechronos]

370 cfm would be little less than 13T, little more than 13G (360 cfm IIRC)

[Toni]

So I made 480whp(billet dr650s) on mine and I am pretty sure they were dirty...

From that estimate, I'm guessing I'm a bit over a 13t level. But what does that really mean? 5hp loss? lol? Slower spool?