ok guys, so here's a few pics of the custom intake I built for myself. I bought an Apexi filter ($65 shipped) after reading about the filter shootout and intake piping from ebay ($45 shipped, comes with everything you need), and then cut it down to the length I wanted. The catch here is you have to use a smaller battery. I bought a light weight racing battery for $119 shipped (had to cut some small slits in the metal battery tray for the new J-bolts to hook to to tie down the battery), I weighed the stock battery (39.5lbs) and racing battery (13.5lbs) myself, so in my opinion it was way worth it to lose 26lbs. I also did the throttle body bypass at the same time and I have to say with the butt dyno these 2 mods definitely give more hp and increased throttle response . If you have any questions or comments about the mod please feel free to let me know and here are the links for Apexi filter and the racing battery (guess i gota start a build thread now ):

Apexi filter: http://group5motorsport.com/apexiint...2/i-35827.aspx

racing battery: http://www.performancedistributors.com/batteries.htm

p.s. next project will be to paint that ugly engine bay to match the car

p.s.s. mad props to bigvinnie for his tb bypass write-up, it definitely helps

 

you don''t have to use a smaller battery. you can move the one you have to the other side of the engine bay. you'll have to move or remove a few things but it will fit.

 

right, you could, but as the title says "custom intake w/o battery relocation"

 

never mind then.

btw thanks for the link to the filter. the cheapest i ever saw it for was about $75 + shipping.

 

no problem man, a word of caution about that filter though, the bolt pattern on it does not fit the stock maf (g70) nor the n60 maf, i had to makeshift something in order to connect the maf to the filter, so just beware

 

I like your set up....
When you shorten the length of the intake pipe into the manifold it gives a much more accurate reading of air density.... Your maf serves 2 factors, determines air density, and velocity. Now thin air which is less dense is harder to cool the hot wire, velocity determines how fast the hot wire cools determined by the cooler air density. Hotter less dense air is harder to cool the hot wire....
The point I am getting at is......
The stock intake pipe runs over the radiator. A radiator is hot, so what happens to the air as it travels through the intake pipe which is over the radiator makes the incoming air that the MAF read as dense air is actually expanding and becoming thinner hotter air as it gets to the intake manifold and eventually into the engine. This changes the load characteristic making the KA boggy or slow by the time the air reaches the cylinder chamber it's to thin tohave any type of serious compression potential.

Not to mention a shorter intake is better matched to the engines RPMs. The longer the intake is the less responsive the engine is since you have velocity which is the rate of time it takes for it to reach the cylinder chamber.

A longer intake pipe effects LOAD. The longer a pipe is the harder it is for an engine to pump that air into the cylinder chamber. The concept is to allow the engine to get as many air molecules (oxygen before it gets hot and expands). think of an engine as a pump since it deals with fluid dynamic principles. the longer a pipe or tube is the easier it is for that pump to burn up. Shorter is always better....

Velocity is only half the battle... Velocity doesn't change from engine RPM to the point air passes throgh the TB. What does matter is retaining the velocity while keeping air denser....

I would say your modification is a 3~5HP gain with supreme fuel.....

If you want to make another 1/2 ~1 hp at high RPM remove that stupid valve cover hose from your valve cover to your intake. Add a breather filter to the valve cover, and cap off the line to the intake..... Do you like your engine to choke on it's own notious oily gasses?

 

I didn't see it in there but you might have mentioned it and I missed it but the Intek pipe also determines where it makes it's peak power and what not, it might not have such a great affect but it should show some kind of power shift...