sri/open air box

neon angel · Post by **neon angel** » Sat Dec 15, 2007 11:06 pm

ive read and been told by alot of car guys that a sri/open air box tends to slightly lean the car out due to more air flow if this is true what is the % of lean it is JUST A GUESSTIMATION ??

Post by **Canada** » Sat Dec 15, 2007 11:13 pm

0%

All an open airbox will do on our cars is make more noise and inhale warmer engine air.

Hot air = bad for combustion / optimal performance.

Arro · Post by **Arro** » Sun Dec 16, 2007 1:33 am

^ yes this is true, and to further clarify, the only cars that worry about airflow are those that use airflow metering to control the air/fuel mixture. Chryslers use speed density, so they don't care if the end of your intake has one, two, or five filtered ends, or with no filters at all.

It's all read off of a MAP sensor which is plumbed into the intake manifold's plenum via vacuum line (usually).

TN.Frank · Post by **TN.Frank** » Sun Dec 16, 2007 11:41 am

Seems like as long as you do a resenator delete and set it up so you'll get plenty of fresh, cold air into the air box that with a drop in K&N you'd do as well as with a more expensive CAI set up. Also, it'll be easier to get to your filter in the box then it will with the way most CAI's do it by mounting it in the fender well.
We had a lot of rain yesterday and I had to run to Nashville to pick up my wife at the airport. Thru all the rain and everything my filter stayed dry even with my Ram Air set-up, which supprised me. I was expecting a wet filter when I got home last night but in the air box it was bone dry. That made me feel a lot better about my Ram Air set up.

Arro · Post by **Arro** » Sun Dec 16, 2007 2:02 pm

Well yeah where the filter is isn't important. The way you say you want to do it will work.

The two main reasons why people go with a quality CAI is:

1. Looks and ease. It bolts on in no time. It looks great. And it improves the intake flow in the process.

2. They need the C.A.R.B. exemption sticker that the better brands often come with, because their State is strict on it, and they aren't interested in removing a bunch of crap before their smog test.

Otherwise that's about it. Many people have been very happy with "Ebay" cheap generic CAI's, and some have taken the in-the-bay intakes (not cold air) and adapted them with their own cold air sections.

2001rt32 · Post by **2001rt32** » Sun Dec 16, 2007 3:18 pm

i just made a ram air style with the intake tube from a 1st gen s10 and i cut the bottom of the air box, made a bracket to bolt it up to the box and it works great. i just took it off for the winter.

OB · Post by OB » Sun Dec 16, 2007 5:26 pm

If anything, doing something that causes warmer air charge temperatures is going to cause a slightly richer mixture. The cooler the air charge, the denser the mixture, therefore the need for fuel is reduced by a slight amount. The opposite is true as well.

Obviously, adding more fuel to a cooler charge is a sure way to make power, but the computer is much more likely to take advantage of the cooler air and use less fuel for increased fuel economy. This is why a CAI has little effect on performance. On the other hand, the effect on overall efficiency and emissions gained from a CAI isnt something to be overlooked.

Post by **occasional demons** » Sun Dec 16, 2007 9:17 pm

Canada wrote:0%

All an open airbox will do on our cars is make more noise and inhale warmer engine air.

Hot air = bad for combustion / optimal performance.

Not always true. Well maybe with the auto industries mindset. anyone remember Smokey Yunick? Yet another invention that could have been effective in reducing our oil dependancy but has been conviently put to rest.
http://www.smokeyyunick.com/
http://schou.dk/hvce/

Car/engine Fuel consumption 0-100 km/t
Plymouth Horizon, 4-cyl 1.00 l/mil 14.5 sec.
Plymouth Horizon, Hot Vapor. 0.43 l/mil 6.5 sec.
Pontiac Fiero, 4-cyl 1.07 l/mil 14.2 sec.
Pontiac Fiero, Hot Vapor 0.46 l/mil 5.9 sec.
0 - 62 mph in 5.9 seconds ain't bad for a Plymouth Horizon.