K&N Air Filter Mod.
 

I have been having this slight turbo surge at tip-in boost. I was told it may be due to flow restriction at the filter amount other things.
Even though it is an old filter, It sees light just fine from the inside so flow shouldn't be a problem. I could buy a new filter buy since I had this newer smaller filter on hand why not see if I can increase some air through it somehow.
The only thing I can do is open up the top of the filter and add my own filter element. I used 2 sheets of the finest 316 ss wire cloth from McMaster Carr and added a HVAC filter pad in front of it for extra protection and can easily replace when needed. A white deflector to keep water out of the filter if caught in a monsoon. I may just add some sort of plug to close it off if need be but this is not my daily driver.
It work, surge is gone at low boost. I will try it at high boost when I get a chance to in the coming days.
https://cimg5.ibsrv.net/gimg/www.cob...b21332b222.jpg
https://cimg9.ibsrv.net/gimg/www.cob...3a6daa457f.jpg
https://cimg1.ibsrv.net/gimg/www.cob...9458dce943.jpg

Looks like a $1,000 air filter there mate, "BLRT Performance Billet Cone Filters"

That's a pretty badass DIY. How were you able to open the top of the filter? Did you drill in and dremmel to the sides (leaving a ring enough to keep the filter itself in place) or if your new topper holding that filter in?

Just want for share some new ideas with you all which some of you may come up with an even better one. Thanks..

I don't want to take away the structure/integrity of the filter, I just wanted to make it flow better. All I did was to cut out a X opening. the total diameter was 1.75" trying not to cut into the paper filter. And if I need to, I can cut out the X all together. This has the small top area unlike my old one. Machined the housing to snuggly fit the filter top to create a tight seal.
For the housing, I had machined 8 slots (8 spoke) circle to support the wire cloths. I make a point to have a 3" flange to hook up a duct to it if I wanted as an option.

I am very happy with the results. Roll on the throttle at 3300 rpm with no surge all the way to 24 psi. She was hauling in 56 f. Maybe just in my head or maybe not? But the car seems to run stronger? It was not slow before.

Not show in the pics are two additional mods I have made years before. One, is the heat shield to isolate some of the engine heat from the filter area. The other is a fan to draw cooler air from behind the fog light and openings from the bottom and deflector from my under tray. Why have an cold air intake that suck in hot air from the engine bay?

but hotter air increases flame propogation speed and in addition the higher charge temps will actually decrease auto ignition delay time.

https://www.sciencedirect.com/topics...ry/flame-speed

What you say may be true but she felt a lot more power in 60f than in 95f.

I'd really love to see what some logging/ tuners thinks of this filter. It's certainly clean professional work with potential. The rundown on other CAI on the market( listed here in forum) isn't really that impressive so there'd be room for another one on the market.👍

It is 100% true what I presented, these characteristics reduce engine performance. Forced induction engines are typically knock limited (where you never achieve enough timing for torque to drop off); therefore colder intake temps are a critical factor in maximizing timing advance in addition to being higher density/higher energy air charge for combustion. Anyways, your billet air filter looks sweet and sounds functionally successful after it solved your surge problem.

Thanks for the compliment. I am very pleased with the result.