turbo filter restriction
turbo filter restriction I am wondering how much this air filter is going to hold me back power/spool wise. Its about as big as I can fit for now. Plans are to get a 90 degree elbow made coming off the turbo to allow for a larger air filter. In the mean time... I have to run this. The filter is 3 1/2" long with a base of 6"
it will suck. Mine was about the same. with a 20# spring, i could only make 9.5 psi. took off the air filter and opened up the cutout and boom....20psi...blew my motor. THAT is how i found out it was a 20psi spring. it will work fine for the street but you want to remove it at the track and make sure you know what spring you have in the wg.
so then my next question would be.... what would be a decent sized air filter to flow well? My car sees more rape sessions on the streets then it does the track so I would like it to be no restrictions on the street.
That filter in the picture is going to be a big restriction. I watched a turbo filter choke 50 hp on the chassis dyno. Stay away from the mushroom style filters, not really the hot ticket. AEM has some nice filters that seem to work pretty good.
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I am gonna try this one hoping to reduce restrictions, its HUGE
http://www.aempower.com/ViewProduct.aspx?ProductID=1250
http://www.aempower.com/ViewProduct.aspx?ProductID=1250
Last edited by ZZebes; May 8, 2008 at 02:10 PM.
ls1_chevelle, That filter is a huge restriction. I was running a 4 1/2 long K&N filter. On the dyno I picked up 80 rwhp and 1 psi by removing the filter. This was running off my 8 lb wastegate spring. I'm only running a screen all the time now.
The filter you have flows a fraction of what you need.
Use the calculator to see the filter area you need to make the power you want and use that as a guide in selecting an appropriate filter.
From K & N's website:
"Filter Selection
If maximum horsepower is the objective, the size and shape of the air filter element is paramount.
Let's first consider shape. When fitting a conventional round filter on top of the engine, such as a carburetor, central fuel injection or throttle body fuel injection, we have found a large diameter, short filter will flow more air than a small diameter, tall filter. For example, a 10-inch diameter filter 2-inches tall will flow more air than a 5-inch diameter filter that is 4-inches tall. Where space permits, the height of the filter should be between 1/5 and 1/4 of its diameter.
The shape of the filter is less important if the application calls for a remote mounted filter, which includes many late model fuel injected models. Typically these vehicles will use a flat panel filter or a conical or cylindrical shaped filter with a rubber mounting flange designed to be mounted on the end of the inlet hose.
That brings us to size.
Use the formula below to compute the minimum size filter required for your particular application. The usable portion of the filter is called the EFFECTIVE FILTERING AREA which is determined by multiplying the diameter of the filter times Pi (3.1416) times the height of the air filter in inches, then subtracting .75-inch. We subtract .75-inch to compensate for the rubber seals on each end of the element and the filter material near them since very little air flows through this area.
A = effective filtering area
CID = cubic inch displacement
RPM = revolutions per minute at maximum power
Example: A 350 CID Chevy engine with a horsepower peak at 5,500 rpm.
If you are sizing a panel filter, multiply the width of the filter area (not the rubber seal) times its length. If you are sizing a round filter, use the following formula to determine the height of the filter.
A = effective filtering area
H = height
D = outside diameter of the filter
3.14 = pi
0.75 = the rubber end caps
Example:
Referencing the K&N catalog shows the proper filter for this application would be an E-1500 which is 3.5 inches tall. Keep in mind, this is the minimum size requirement. To extend the service interval and to provide an even greater volume of air to the engine, install the largest filter that will fit in the space allotted. If the space above the engine is restrictive, perhaps a remote filter arrangement could be used to gain space.
Off-road conditions require added filter area. A filter should be sized 1-1/2 to 2 times larger than normal for any conditions that could be considered severe. In this case, the E-1500 used in our example should be replaced by an E-1120 or an E-1150. For long distance off-road events, two double-size remote mounted filters would be best."
Use the calculator to see the filter area you need to make the power you want and use that as a guide in selecting an appropriate filter.
From K & N's website:
"Filter Selection
If maximum horsepower is the objective, the size and shape of the air filter element is paramount.
Let's first consider shape. When fitting a conventional round filter on top of the engine, such as a carburetor, central fuel injection or throttle body fuel injection, we have found a large diameter, short filter will flow more air than a small diameter, tall filter. For example, a 10-inch diameter filter 2-inches tall will flow more air than a 5-inch diameter filter that is 4-inches tall. Where space permits, the height of the filter should be between 1/5 and 1/4 of its diameter.The shape of the filter is less important if the application calls for a remote mounted filter, which includes many late model fuel injected models. Typically these vehicles will use a flat panel filter or a conical or cylindrical shaped filter with a rubber mounting flange designed to be mounted on the end of the inlet hose.
That brings us to size.
Use the formula below to compute the minimum size filter required for your particular application. The usable portion of the filter is called the EFFECTIVE FILTERING AREA which is determined by multiplying the diameter of the filter times Pi (3.1416) times the height of the air filter in inches, then subtracting .75-inch. We subtract .75-inch to compensate for the rubber seals on each end of the element and the filter material near them since very little air flows through this area.
CID = cubic inch displacement
RPM = revolutions per minute at maximum power
Example: A 350 CID Chevy engine with a horsepower peak at 5,500 rpm.
H = height
D = outside diameter of the filter
3.14 = pi
0.75 = the rubber end caps
Example:
Off-road conditions require added filter area. A filter should be sized 1-1/2 to 2 times larger than normal for any conditions that could be considered severe. In this case, the E-1500 used in our example should be replaced by an E-1120 or an E-1150. For long distance off-road events, two double-size remote mounted filters would be best."
woa....math. Just looking at the filter I can tell that is huge restriction. Should be fine for running on the street, but I would definitely run an elbow and try to get a bigger filter.
so it looks like i need a base of 6" x 7" long min for a filter. Once the car is on the road I'll swing by my buddies place and get a aluminum elbow welded up. Thanks for the help guys!!! Heres a couple more shots
I had a friend tig weld the v bands on. The process took about 5 hours total welded inside and out. Zero warpage. Proper rod, pre heat, maintain heat, post heat. All done with an oven for 100% even heat dispersion.
Thanks for the comments. It was fun and very interesting. Was my first turbo system that I fab'd and welded myself.
