We also have picked up two pounds of boost by swapping out the ProCharger supplied air filter to a larger one. This was when the ProCharger was already putting out 14 psi of boost. I suggested this to a customer last week, and sent him a larger filter, and he got the same results. This was with the stock inlet hat still in place. Bob

 

Bob,
Do you have the part numbers for the bigger filter and the small ones to fit on the bypass valve?

4:06am Bob? you're nutz

 

You sent me one also. I won't be able to tell though. I'm putting on a smaller pulley and meth too.

 

Currently all I have is a part number for the filter we have used that has a four inch inlet. K&N RE-0870 is the part number. You would need to somehow jump up from your three inch inlet to a four inch to use this one.

My wife tells me I'm nuts all the time... Bob

 

I think if you are making 700-900rwhp you would ideally be looking at filters (big single source) that are probably a foot long or more. Talk to a filter tech person at KN or SB and see what they say.

 

Interesting results!

Green Line - 2 Window Screens on a 45 to one another. This gave us the lowest boost and the least power.

Middle Red - Stock ATI Little filter for an 04 GTO (Very limited room)

Purple Line - One Window Screen. Little bit more boost then the stock filter, with minimal gains for the safety given up.

Top Red Line - No filter at all...The most boost and most power.




This is a picture of the stock air filter and the two screens. We have a MUCH larger air filter we will be installing some time next week and we will report the results.



If anyone would like to request something to test out, or have any suggestions, please ask!


I should note, the car is an 04 GTO with a mild cam, P1SC, LTs, Full Exhaust and other supporting mods. The GTOs have a super small area to put the filter and it may be the reason we are seeing such a larg gain. I think the FBodies and Vettes have a much larger filter.

Bob, can you confirm that?

 

My f-body filter looks to be the same size as the one shown above

 

If space is limited, the HKS green mushroom filters have been used on many big power Jap cars. ( Super Mega Flow )

They are about 8-10" diameter, but only 4" tall or so, so pretty compact. Some rant and rave about them, some say they are crap....
Then again, you get that about most things.

Im using a K&N RU-3050. Its as big as I have room for. Id say its performing ok though. 6" inlet, circa 8" diameter tapered cone about 8" tall.

 

Next time I go to the dyno, I think I am going to try the following:

-Small (current) filter/ hat assembly for a baseline

-hat only with no filter

-hat with bigger filter, I'm thinking maybe a truck filter from a 95ish chevy (I've heard one of those can be stuffed in the cavity in front of the front wheel)

-no hat or filter

If you could try that 70Stang as well that would be great to have 2 independant tests...

 

i just called KN about my dinky street filter....428cfm!! I asked the chick "do you think that will support 1000rwhp?" she said she wasnt sure but the KN filters flow much better than conventional paper filters Good thing i got a screen for the track

 

Typical salesperson response. No help at all...

 

I spoke with Thomas, a Tech a K&N. He was a huge help in recommending a filter for my application. He asked for inlet size, cid, horsepower, and psi. From this he was able to provide a list of choices needed to support my current horsepower and some filters that will flow beyond my current needs giving me some headroom. Naturally size and shape are limiting factors to your choices.

 

i knew mine was too small but its all that will fit in my limited space...i just run it for the street.....i was asking the girl about the hp to be a smart ***

 

I see you now offer one for the 3.5" inlet size as well.

http://www.exoticperformanceplus.com...html?item=1086

 

She had or has no clue what it takes to make 1000 hp,
if i was on the other end of that call and a guy asked me a bout a 1000 hp I might have got got semi ridgid.

 

Have you retested with the larger filters yet ?

 

this is my filter I only run with it on.

its 4-5" taper, 1' long

 

Here's a link to the topic that has shown positive results from Dallas Performance



http://forums.corvetteforum.com/show...post1567609903

 

we also did aircleaner / no aircleaner dyno camparision..
no difference

k & n 4 inch inlets ,
8 inchs long

tt sbc, 355 cube , 57mm 's, 24-28 psi , 100% meth fuel
tt sbc, 358 cube , 61 mm 's and 66mm's , 32 + psi , 100% meth fuel


ash

 

I am using A pepboys inverted top air filter with EPP inlet pipe.