Air Induction Systems, Voodoo, and simple test

[Stephen]

OH and which modification were you talking about, the slight poerformance gain at cost of noise reduction? do tell

Swiss cheese airbox?

[hugh jass]

fuh raze cheeze grater?

[DCColegrove]

i thought the ribs in the boot were there to fix what you are talking about meaning the laminar flow interuption at the bend or is this not the case?

i am following you on the whole concept and certainly wouldnt argue with you on it (even if nobody else knows your qualifications i do) but can you offer a definitive explanation and solution.

[StereoInstaller1]

I just want a pretty red or blue hose that looks cool, and fits the same color scheme as my bitchin' cold air intake.

I heard that those new super low friction throttle cables give you quicker response too. As long as it is the same color, I want one!

[BMWLA]

i thought the ribs in the boot were there to fix what you are talking about meaning the laminar flow interuption at the bend or is this not the case?

i am following you on the whole concept and certainly wouldnt argue with you on it (even if nobody else knows your qualifications i do) but can you offer a definitive explanation and solution.

[xLibelle]

the faster its going when it gets to the runners the faster it will be through the runners

Thats what one would think, but again, vacuum and boost are very different systems.

If it takes energy to move air, the energy to move air in a boosted system comes from the compressor. And you'd think equally, the force to move air into a vacuum (on NA engine) is based on the positive pressure outside the vacuum but its not. Its from the greater negative value which is at the valves.
And yes, the faster air moves in to fill the runners with air, the better, but the previously suggested theory about velocity a mile down the intake system is a bad one. It doesnt matter how pretty the tubes are, if they are choked up, its like sucking a golf ball through a garden hose.
That blue boot looks pretty darn good actually, if its for the m30 AFM. But at its most critical point, the bend, it gets pinched. Needs to be larger.

[Farbin Kaiber]

samco will pretty much fab any elbow you require for the price.

[JUMPNYC]

Where did you get that boot intake? I want one!! looks sweet!

[Eric]

something like this?

[z31maniac]

I'm already running it on my M20 powered car and have had a whole different system for the M42 for several years.

The M30 AFM will only give you headaches the only step up is an AMM and that's not much of a step on a stock M20.

Pics?

I'm interested in what you're talking about, I just want to see it quantified.

[Stephen]

Hmm interesting.

So what if you run a nice CAI from, say, the brake duct, through a nice filter thats heatshielded, and then with your high flow elbow contraption

Logically thatd seem to be some good air

'cept for sucking in water i guess

[MR 325]

EDIT: Oh the numbers... My 318is daily driver puts about 140hp to the ground and gets about 35mpg on the open road...

FrankenKar on the other hand sucks gas at 22mpg but puts 188 to the wheels naturally aspirated.

Double edit: They both pass emissions cleaner than original..

What mods on these cars?

[NC325iC]

the faster its going when it gets to the runners the faster it will be through the runners

[xLibelle]

this is rediculous. Youre talking about velocity before air gets to the runners? you must have vacuum and boost mixed up. that or you lost me at the beginning.
You're gonna need to post some real numbers because you can talk about "evolution" until your gums bleed and i still wouldnt back up a claim like velocity at the AFM is more important than volume. Todays bimmers have short thick windpipes.
Velocity induces turbulance, which is probably in your previous statement, but turbulance means less volume. more volume means more fuel. inducting turbulance where gas atomization happens could be a good thing. But again, that what happens outside the TB is irrelevant.
The best way to move more is to make it move slower. The slower it moves, the less turbulant it will become.
If youre seriously thinking youre on to something, run it back by because I must have missed it.

[DCColegrove]

Post some kind of real numbers. Or maybe exactly stock as delivered 20 years ago is so perfect there can be NO improvements.

No by far from perfect 20 years ago there were a lot of things we didn't know then, and a lot of things that weren't practical.

For instance multi pintle injectors are a vast improvement over the older single pintle ones.

Software changes because our understanding of what's really happening has improved.

But just making a bigger hole is 50's technology.

EDIT: Oh the numbers... My 318is daily driver puts about 140hp to the ground and gets about 35mpg on the open road...

FrankenKar on the other hand sucks gas at 22mpg but puts 188 to the wheels naturally aspirated.

Double edit: They both pass emissions cleaner than original..