Would it be benificial to add a duct in front of the intake box on the bumper(Think Acosta). I am playing with an idea of doing this with the stock bumper with products like these
http://www.reverie.ltd.uk/shop/produ...762c&g2=52ef96

I was thinking it would be more benificial to seal the duct to the intake box though, so that the air doesn't just go wild into the engine bay. I was thinking of this combined with an intake like the HKS, RB. I was going to add a screen and the back of a duct and drainage holes for any moisture that did get in.

 

Dude, get som glasfiber and **** and make your own. Just drill a hole in the bumper and shape it the way you like it. I did that in less than a day.
Benefitial? Yeah... I guess so. The more air and the cooler air the better. Just make sure to seal off the duct as you descibed. Not so much work, you can just modify the stock airbox.

 

That is basically what I was going to do, since I doubt anything I could buy would follow the curves of the front bumper, how much of an increase did you notice? I wouldn't mind picking up a MPG or two also.

 

Good luck... I've always thought this had promise but I dont' have the ** to cut my bumper up or buy one of these (post #7 on this page https://www.rx8club.com/showthread.p...&page=26&pp=20 ! (girl not included)

 

I wouldn´t expect any increase at all with N/A engines... I run a turbosetup and looking for every extra inch or air I can find. Don´t expect any extra hp, expect to get an engine operating at a few degrees less.

 

try attending an engineering school instead ...

 

Since engineering was mentioned as well as not expecting any extra n/a horsepower I thought I'd just throw this out there. At Sevenstock I chatted at length with John Doonan about the Courage intake since it runs through a restrictor. They are limited to right around 2" total! Think about how much area the RX-8 intake has and compare that. They went to great lengths to get every last little bit of flow from that intake. The result was the long, tall snorkel type of intake we saw on the car. Inside of it was a perfect venturi shape. It was a wonderfully machined piece that was very smooth. The smallest point of the venturi is the restrictor limit size but everything flows perfectly up to it. This perfect airflow shape really helped them get power up. This is why the Courage had several different intakes over last season and probably will further those this year. Without that perfect venturi shape, just by using a pipe on the same diameter, they lost over 100 hp!!! Remember a peripheral port engine is far more finicky when it comes to intake and exhaust restriction. To get 100 hp out of the same sized air passages is engineering!

 

Before you hack up your nice bumper, maybe try the RB duct - it's huge!

Covers ALL of the factory black grille in front, without being visible.

S

 

TeamRX8, I go to an engineering school, but sorry, its not me, I'm a chem guy, but thanks for the smarta$$ comment, you always seem to add one of those instead actual input. Also thanks for those who actually gave input. I just thought of it since I will be having the front bumper removed to repaint it.

 

With a turbo setup this type of intake can be very dangerous. You're getting alot more AIR in on the highway than you would on a dyno. Also, the amount of air you're taking in will vary greatly depending on the temperature outside.
As you're taking in the new massive amount of air... you need the fuel to compensate. Do you plan on tuning differently for all of these situation?

I wouldn't even get into the danger of getting water or debree into your intake. At first i was really excited about the Acosta front bumper with the hole... but the more I thought about it, the more dangerous it seemed for a FI setup.

my .02

-hS

 

Oh, in response to the original question. If you did go with the intake on an N/A setup, i would definetley recommend a duct that directs the air correctly so it isn't bouncing all over the inside of the bumper as well as the engine bay.

Also, I would definetely put a screen behind the bumper hole.

-hS

 

It seem that you would get a lot of turbulance right there.

 

it's not a smart@ss comment. You think just because some guy cut a hole and charges high prices makes it right? If you go to an engineering school then do your research. A lot of times what may seem right on the surface isn't. Otherwise, stop taking yourself, me, or this topic so seriously. Just some advice from your friendly engineering pal ...