any of you remember Icemarks idea of retaining the stock airbox and improving air flow by drilling holes inside and on the sides (cold side) of it?

i was just wondering what the cold side holes were for? ive tried the mod with holes inside and i could feel a difference.

but im hesitant to drill the cold side holes coz logically the air coming into the box will just go out thru the other set of holes right?

can anyone help me?

 

yeah..buy an HKS filter kit or BLITZ..look on ebay for a good used one

 

Sure you could do that. I mean you could also cut a large rectangle out of the top of the stock airbox, put some screen over it so nothing huge hits the filter, and you have much more flow. On the downside, the accordian inlet duct still sucks.

-Joe

 

From what I recall, the holes were drilled on the front side of the "lid" to keep from sucking hot air in from the engine compartment, as you will do if the top is cut out. Inside modified for better flow. Remove the right side rubber sealing strip between the hood and radiator support to get the cooler air in.

 

where does the air duct get its air from in the first place?

oh yeah, i have a K&N drop in right now and did icemarks "inside" mods...havent done the holes on the "cold side" of the box.

i was thinking of removing the plastic stuff between the rad cross member and the fuses infront of the engine bay (opposite where the rad water bottle is) and making a custom duct from the OEM air snorkel down thru that opening so fresh air that goes into the rad will also go into the custom duct.

 

You retain the stock factory intake system and just drill holes in the front side of the lid to allow more air to flow as the factory system is restrictive.

 

https://www.rx7club.com/showthread.p...hreadid=174770

 

Its only about $25 for a cone filter...why not go that route?

-Joe

 

i wanted to keep the stock look.

 

Sound how much is air flow really increased by cutting the air box as shown in the other thread?

 

Yuck... you must be someone that has not seen the HKS disolve and dump closed cell foam into the AFM and motor at 10K miles.

Anyway, the idea is hardly mine... it has been done on FCs since the 80's.



and in the future, please do not use forum members names in the title (it does not matter who)

 

i did the mod in 1999 with my 87, it was a definite improvement with a k&n and the holes drilled. i do not know how it would compare to a cone filter with some cold air ducting but id imagine that with the k&n and holes it would get pretty good flow and hey its free to do.

since it was so long ago i cant tell you how much better it was, but i know the engine had a bit louder intake noise and i figure the louder noise meant a bit more hp. i do know it made a butt dyno difference.

 

And much more heat. It doesn't matter what you do, you're still going to be sucking hot engine bay air. The more you modify the airbox to lower its restriction, the hotter the intake air will get.
Have you actually measured the pressure drop though it to prove that? That duct is huge compared to the output of the engine. How many engines have you seen that have a duct that starts at 3" and gets bigger?! Given it's size, the corrugations in it will be having far less effect than you'd think.

You shouldn't remove those plastic panels, or you'll reduce the amount of air going though the radiator. They are there to stop air from taking the easy path over the radiator instead of going through it. You could modify one panel to run a duct though it, but since you'll still be stuck with the restrictive snorkel and airbox, IMO it's a waste of tme.

K&N's aren't actually free. I guarantee if you replaced it with a OEM filter you wouldn't notice any difference. It's the box that's the restriction, not the filter. "Performance" panel filters are just a big con-job...

 

sorry 'bout the "name-in-title" Icemark.

as for NZConvert: i came up with that ducting idea coz' i wasn't sure where the air was drawn with the stock snorkel in the first place.

my plan in detail is to make a duct, but to, also, improve on the deflector so more air will go to the rad. im not gonna leave it just open.