Here ya go Suzaku, Ask him straight out if he'll make one for ya, ...





Someone needs to do some before/after dyno tests.
That way you have some facts on paper.

 

I was kind of thinking that as well.

Airflow is aiflow is airflow? Does it matter if it is being pulled or pushed? I'd assume flowing air is flowing air, wether it is being pulled or pushed. If thats the case the straighteners will help in both instances.

I think maybe your a little confused on the purpose of the straightener. It isnt there to help the flow of air, but to straighten it as it flows across the maf for a more accurate reading.

 

if the air is being pulled it will go in the direction it is being pulled, if you are blowing air into an open room/box as in the video it will go in many directions and span outwards it may come out of a 10in fan and cover a 60in area 3ft away from the 10in fan.

If the air is being pulled into an engine it will follow all the way to the source.
As for the maf reading you would have less air flowing through the maf, you have added a restriction in flow.
if you squash that stuff down you will see how much surface area you have lost. so you now have less air/more resistence in air flow, just like a 100cpi cat flows better than a 200cpi and a 300cpi, the bigger the holes the more air flow, no cats at all the better the air flow, no mesh on your maf the better the air flow.
Us aussie guys dont run Mafs anyway, we all go mafless tunes.

 

They've got that size:

http://www.saxonpc.com/100mm-cells-for-100.html

 

I guess i should have said if it was in a tube, like our intake tracts. Would the airflow characteristics change if it was being pulled or pushed.

Yes you would have less airflow, im not disputing that, but the straightener is helping to provide a more accurate reading to the maf, with a more even, or straight if you will, flow of air. The hptuners thread has examples of the different maf readings before and after the install of the straighteners.

 

The other issue to consider is the way the air is being delivered (fan's constant velocity vs. an engine's intake pulse due to cylinders firing in a specific order).

In the end I think it's a matter of splitting hairs with limited to no real hp gains.

 

what's difference between pushed or pulled air:
air flows from higher pressure to lower pressure so there is no difference.

 

Its not the difference in airflow as it is the quality of the MAF signal the PCM sees.

 

See below.

^This.

That's the reason many people choose not to "descreen" the MAF, is because it does not properly smooth out the airflow in front of the MAF. Pretend the MAF wasn't there, sure this airflow straightener is pretty much pointless then, but the object is to open up and gain airflow a little bit more, but still allowing a smooth airflow over the MAF wires.

These screens are interesting. I think it would be worth something, because people seem to think descreened MAF's gain HP, so this more "opened" up screen, should help in two ways.

What keeps the screen in place though? Does it rest on a lip on the inside or something?

 

I did descreen some time ago. The only difference I noticed was it took longer for my idle to settle down to the normal 700 - 750 rpm. I ran with this this new screen for over 100 miles and the idle dropped down to normal 700 rpm faster. Then I removed the screen and ran for about 50 miles and the idle took longer as before the screen to settle down.
I don't know about more or less H.P.but a more precise signal to the MAF must be good for something.

This what got my interest




I want to say that there seems to be more response when I start off from 0, but with the new plugs and wires change I'm not going to claim anything there.
How ever with the new screen in my son's WS6 there seems to feel stronger at take off.
I think there is a forced air effect in my Z with it's Ultra Z hood blowing directly into the air lid. And the WS6's ram air scoops doing the same. Also both cars have SLP CAIs. I realize there isn't any benefit from a start off

The screen stays in place from a friction fit against the side walls and bottoms out on the lip. The edge fins will deform , but they seat against the shelf and don't show through to the MAF There are some teats down by the shelf that you'll need to wiggle around to get the screen to fully seat. It's almost a snap fit.

I wonder if a test showing the candles in a tunnel with the fan in exhaust mode at one end of the tunnel sucking air or smoke through and the placing and removing a screen at the other would work ?

 

Yes a de-screened MAF will flow more volume then one with a screen but, the screen straightins the air flow there for the air has more velocity when entering the engine. I would rather have more velocity of air then just more ambient air. In my opinion, GM put the screens in there for a reason and sure there engineers are a little more knowlegable then i am, there for my screen stays. Just my 2 cents

 

Has anybody tried this screen besides me ? I'm curious to know if anybody noticed a differance.

 

Some cars seem to notice descreening, some not. I've been using a
descreened 85mm truck MAF for years without issue, with various
GM MAF tables. Personally I'd rather tweak it right in the tables than
put another restriction back in the lineup.

 

As soon as I get an email back from the guy, I'm going to be giving this a shot. He has LS1 listed as 86mm... That is for a Z06 or truck MAF, so I need to know the size for a STOCK MAF.

The only reason I haven't descreened my MAF was b/c I was afraid of the turbulent air flow causing problems. This seems to be a nice solution. Hey, for 10 bucks, it sure won't hurt to try.

 

Not trying to be an *******, but that is some stupid logic. The GM engineers also put exhaust manifolds and a 10-bolt rear in your car, does that make it superior to long tubes and a 9"?

iirc, the stock LS1 MAF is 75mm.

 

I have a stock p&p MAF. When I met Jason he was selling his screens to folks that told him what size they wanted, he had very few patterns. He used my stock Maf housing for the LS1 pattern.
For a 5/8" thickness which is a perfect depth fit and has much longer tubes, 5/8" vs. 1/4", you would probably get the 86mm, that's what I have. The hole diameters ar 1/8" instead of the stock 1/16". This is less restrictive to air flow, if that amounts to much.

I ran descreened for a long time and never had any performance issues or thrown codes. The only annoying thing was that when coming back to idle after getting on it the idle would stay at 1000+ rpm for several seconds and then slowly drop down to 700 - 750 rpm. Even when driving normally the rpm would drop down slowly. After installing a screen I don't have that 1000+ lag anymore and my idle drops down much faster.
I also had an 18000 miles almost stock 2001 WS6 to play with for a few days. I drove it around descreened and screened., I definitely felt an improved responce

The air straightener thing seems to be a big thing with Corvette people
There's a company that's selling these for $50.00
http://www.halltechsystems.com/Produ...uctCode=HC.125

Read what's said
http://www.101corvetteprojects.com/2...-installation/

Here's some observations on my Z. I have a Ultra Z hood that has a ram air scoop that directs air straight into the SLP lid, Maf and TB. I don't remember having an idle drop down issue then, without the screen. Back then I didn't bother to cut out the bottom of my air box. Then I decided to put in an SLP CAI. It may have been then that the slow drop down to normal idle started to happen. Did the now sharp 90° air flow coming up through the duct, from the bottom start to cause turbulence ?

I'm thinking about installing a screen in my wife's 2010 Challenger. That CAI has has 2 90º and 1 45º turns

 

I to have the RPM "lag" that you describe, and the previous owner did de-screen the MAF. The lag drives me nuts! I may look into one of these to see if it solves my issue as well.

 

Just placed my order. I'll report if the lag goes away or if I notice any other changes. For $13 shipped, it's worth a try!

 

Which did you order? I know to get the 5:1 ratio, but 86mm? Thats for the vette guys with the 85mm MAF. We have a 75 stock. Do we get the 75 or the 73?

 

Ah crap lol.... didn't even pay attention to that, just saw LS1 and clicked that. I'll have to shoot am email to make sure they change it before it ships.... thanks for the heads up!