Air Induction Systems, Voodoo, and simple test

[OrganicMechanic]

this looks like a GM peice...from a MAF

[NC325iC]

having something like this will be more likely to send what may be laminar flow past its boundary condition into turbulent, it will probably not do the opposite.
(to liquid)

[liquidgroove]

Would it be better with a honeycomb plate?

The honeycomb shape should maintain most open area while convert the flow into laminate flow for higher velocity

[DCColegrove]

So basically while the cheese grater makes airflow better, the engine cant make use of it anyway?

True... Kid hits the nail on the head.

Not a "stock" m20 anyway...

Without a lot of other modifications changing the intake piping on this end wont get you far...And most will cost you power.

More importantly a lot of things aren't what they seem at first glance.

A lot of things are a little more complicated than they look...

Like the fact that a smooth pipe will flow way less air that a rough surface or better yet a uniformly micro ridged surface.

What happens when it turns sideways two years down the road?

These were held in place with large steel cir-clips on either side.

[delatlanta1281]

What happens when it turns sideways two years down the road?

[Stephen]

So basically while the cheese grater makes airflow better, the engine cant make use of it anyway?

[DCColegrove]

You mentioned something about intake mods for an M42. Care to elaborate?

I missed this one...

I have one in a box under my bench...

When I get the chance I'll pull it out and shoot it...

...It's cost just to build them was about $300 so they wont be selling anytime soon.

I do have a manifold port design I've been wanting to do some on-car testing with but I haven't had the time and some of my necessary equipment to fab it is blown up at the moment.

[blunttech]

Yeah, Ground Control tried this a few years back with what they called the "Green Gizmo".

It was a major flop, IIRC.

There is one in my S50 E30, but only because Bob is a silly boy. ;)

Good luck.

i remember that green gizmo. super duper told me he had an ace up his sleeve as our cars were prepped identically.
but since he was painfully aware i was the superior driver he felt the need to go out and try to beat me mechanically. well needless to say it didnt work. but later we pulled it out and made a lovely ceasar salad with his salad shooter intake gizmo

[DCColegrove]

Yeah, Ground Control tried this a few years back with what they called the "Green Gizmo".

It was a major flop, IIRC.

There is one in my S50 E30, but only because Bob is a silly boy. ;)

Good luck.

I'm not selling this stuff... not really my specialty anymore.

This whole thread was a info only thing... and a little rant.

EDIT: this grid was out of my long gone M3...

[Ben Carufel]

Here's the link:

http://www.ground-control-store.com/products/description.php/II=502/CA=9

[Ben Carufel]

Yeah, Ground Control tried this a few years back with what they called the "Green Gizmo".

It was a major flop, IIRC.

There is one in my S50 E30, but only because Bob is a silly boy. ;)

Good luck.

[DCColegrove]

I suppose I should have explained this while I was here at lunch...

This Grid:



Placed in this area of the induction at a 45 degree at the leading side of the center of the 90 degree turn forces the air to make the turn without tumbling.

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

Swiss cheese airbox?

Hell no on the holes in the air box...

Inside the air cleaner there is (or should be...we are talking 9/87+) an Air horn...

It is only about 20mm away from the inside of the air cleaner wall....

Shorten this by about 30mm (take it off the back not the end...requires splicing the mounting attachment)

I did. I think you should go threw with your plans. also I noticed when I did the M30 AFM it made my car run very lean untill I did the injectors to match, doesn't that mean it flows better than the stock AFM? but I do see how a bigger door could mean a bigger restriction.

The car ran lean because there wasn't enough volume / velocity to swing the "door" as it would in it's intended application's arc.

What mods on these cars?

318is: 2.0l, lightened bottom end internals, Manifold and Head Porting (also combustion chamber mods), Software (hp was higher with cams I have since swapped out back to factory).

FrankenKar (90 325i): Stock Displacement, Modded Pistons, Cam, OS Valves, Manifold and Head Work, Reduced rotating mass, Software...and some really cheap ass (hell free) Alpina Knock off headers from China.

Anything else?

[BMWLA]

There are some slight modifications that can be made in the stock air box that will improve overall flow at the expense of slight noise resonance… But over all the stock E30 / M20 air cleaner with a clean panel filter element can efficiently flow nearly twice what a stock M20 can use.

i think he was saying it isnt

[z31maniac]

+111 million

any gains from a super fancy intake/elbow are pretty much out the window because there is a friggin SQUARE DOOR in the middle of the intake tract.

I should run a line from my second MAP sensor to the airbox and compare pressures to see if the stock intake is really a significant bottleneck.

Do it. I trust your datalogging and it would be interesting to see the results.

[BMWLA]

one solid thing i can say for sure outside of his legend status with the techs here is that his 318is is really dam fast for a 318is