Air flow

[1952ray]

My K&N filter is right behind the driver side air dam. Lots of people have theirs right after the MAF under the hood. Which way flows more air, if any. Or is it just a personal choice?

 

[gsgnnut]

Mine is attached right next to the MAF which is in the original location. I think from a flow efficiency stand point the shortest path with the least amount of bends is ideal so the nearly straight line path to the turbo is least restrictive and should yield the maximum perf.

 

[Jerryl]

To a point . . . The further away from the MAF, the more stable the flow gets across the element. . . .Amd I will never purchase another KN junk filter.

 

[1952ray]

To a point . . . The further away from the MAF, the more stable the flow gets across the element. . . .Amd I will never purchase another KN junk filter.

Ok, makes sense about stable air. What filter do you use?

 

[Jerryl]

Ok, makes sense about stable air. What filter do you use?

http://www.amsoil.com/shop/by-produ...ersal-air-induction-filters/?code=EAAU3050-EA

 

[1952ray]

http://www.amsoil.com/shop/by-produ...ersal-air-induction-filters/?code=EAAU3050-EA

View attachment 229567

Cool, will buy one today, Thank You

Ray

 

[usrg75]

To a point . . . The further away from the MAF, the more stable the flow gets across the element. . . .Amd I will never purchase another KN junk filter.

Getting ready to do the same thing. What is wrong with K&N? What makes the Amsoil better?

 

[Jerryl]

First off, you won't get oil on the MAF element affecting its accuracy with a dry filter, secondly in my experience, you won't get chipped compressor blades with a filter that does not rely on an oil film to filter micro particles . . . . and lastly, you won't get oil on the MAF element effecting its accuracy.

 

[gsgnnut]

I don't oil my K&N for that very reason but I occasionally wash it. I need to check out that other non oiled filter. Jerryl you are absolutely right about the straight distance from the MAF, there needs to be at least 6 duct diameters to allow the airflow to straighten out after a radius or elbow. ( I occasional do ventilation calculations as part of my real job ) An elbow connected directly to ( or after) a fan(or turbo) or airflow measuring device can see a up to a 25% system effect loss due to turbulance. Ductwork as straight as possible, smooth inside and large radius bends maximize flow.

 

[usrg75]

First off, you won't get oil on the MAF element affecting its accuracy with a dry filter, secondly in my experience, you won't get chipped compressor blades with a filter that does not rely on an oil film to filter micro particles . . . . and lastly, you won't get oil on the MAF element effecting its accuracy.

Blunt response... I like it! Now to amend my shopping list yet again.



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[Bruce Urie]

Damn! (head smack!) I never thought of the oil situation on the filter. Mine is a K& N,though I've never started the '87 with it yet. Thanks, Jerryl! Very good points you made. Will go with the Amsoil filter instead. Thanks also for giving us the web site....I needed those dimensions. Going to go out and compare, then order. You da man!

Bruce '87 Grand National

 

[wb's87]

I am currently using 9" K&N. It's mounted behind the DS air dam. I almost always see at or close to ambient AIT. This is the reason I chose this setup. When I had the filter under the hood the AIT would be as high as 150* while driving on a hot day and even higher when sitting at a red light.

You guys have me thinking about which is better? Less turbulent air hitting the turbo or cooler more turbulent air??

Either way I am going to order this Amsoil filter.


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[Nick Micale]

I

You guys have me thinking about which is better? Less turbulent air hitting the turbo or cooler more turbulent air??
.......

With lots of field testing as well a dyno time, we have found the less intake air restriction the better!

Every bend in the intake will be a restriction as well as the length of the ductwork.

As far as inlet air, once the car is moving, air under the hood is ambient, so air inlet temp for a filter under the bumper will be the same as behind the headlight.

The most extreme gain we have found on a street car with an expensive air box and ducting from under the bumper was 40 HP with filter and all removed!

We also learned not to oil any air filter as the Buick will provide enough "oiling" automatically!

 

[Jerryl]

Nick, lol @ oiling.

Calculated :
Every 1" pressure drop before the turbo yields about an 8-14 degree F increase in charge temps. As Nick said, try to achieve the lowest pressure drop pre-turbo.

 

[earlbrown]

The air should be colder where you're pulling from Ray. I drove my car yesterday.... It was 90* out, my water temp was 163 and my air inlet temp was in the 130's at cruise... I really need to get outside and install my bigass® cold air kit.

I don't mind the oil on K&NS as much since I know how to oil them. Plus the LT1/LS1's have a different pickup than the big horizontal film on the stock MAF. What I DON'T like is the sharp edge on the end cap the K&N has. That sharp edge at the transition really chokes down the outlet neck and makes it seem smaller than it really is. I've got an AEM filter sitting here that has a nice curved transition that's almost like a velocity stack. It needs to be on my car