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Looking at your previous posts, I assume you have a 76 280Z.

Using that assumption, I can make the following suggestions.

When making your own cold air induction, plan on the following:
Unit must be supported, some how. Do not plan on the connection to the AFM to be strong enough.

Do not used a material that has a smaller diameter than what you replace.

PCV has been used, as well as Mandrel bent aluminum tubing. Rubber toilet elbows have great potential (less than 10 dollars at any hardware store).

All connections should be air tight, and removable (don't construct something that welds or glues to your existing air passages! You may have to take it apart later).

Most people opt for the K&N. Figure out which one you need AFTER you construct the tubing. You may require the filter has a male flange that inserts into your tubing, or one that has a female connection that mates to your tubing. Size of the connection is the important thing. Don't get a filter with a smaller opening than your tubing, and then cobble it together. Find the right one. If the part store you visit doesn't have a wide enough selection, go elsewhere. This is the critical part, and must fit right.

Give some thought to heat shielding. A small deflector behind the filter/in front of the radiator will be beneficial. This will keep your filter from being damaged by the heat. Not essential, but something to think about.

Mount the filter as high as possible, but still in the airflow. This may help to keep some of the road grunge/rain spray off.

Many people have done this, look at some of the sites and see how others have done it. You may find what you are looking for, or find things you would do differently. If you just can't seem to make it work, you could always just buy one (for a pretty penny) from Motorsports Auto.
 

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Air Induction

John,

Have a look at "homemade cowl induction haha" in the older messages, I got the impression these guys were talking about both carbs and/or FI. What, if anything can be done for the SUs besides the afore mentioned cold air mod without causing other problems. Can the metering problem be overcome with a pressurized system?

Thanks in advance,

RDB
 

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If we are talfing about a fuel injected car, I have a different idea on what to do. I have a 78 Z, the first thing I did was remove the lid and long inlet tube from the factory filter system. I then got a K&N flat air filter from the MSA catalog and mounted it in the stock location. I fabricated a small underhood scoop out of a sheet of polished stainless steel that had a front opening (facing the grill) of about 2.5"-3" that gradually sloped down to about 1.5" towards the back then curved gently down to meet the filter with both sides closed in. To secure the front of the scoop I ran a thin long bolt through the underside of the hole where the lid gets bolted down and secured it with a washer and nut. I then drilled a small corresponding hole in the front of the scoop and fitted it onto the bolt with a nut on either side of the metal scoop to keep it in place. For right now I dont have the back side of the scoop secured properly but it stays in place very well. This new scoop pulls cold air directly through the grill and the air gets somewhat pressurized in the scoop from the decreasing hieght of the scoop top. I liike this design because it cost me nothing, and might be as good as or better than the $130 MSA cold air package.
 

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check down a few...

Just below there is a discussion on "homemade ram air haha" and some good info that may make you rethink where you take the air from...
 
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