that is correct, however, you can add a screen or screens to the duct. Different screens will flow different amounts. You will also need one strong enough so it won't flex or change shape in any way. When using your 'own' screen you are trying to create a highflow laminar stream(s).

 

prolly not, chances are it is also being set as a pending code.

 

hehehe, that's why they reset the computer (err.. disconnect that battery) when they install. Oh, unless you did disconnect your battery, in that case it may be the "bellows". i found it tough to see the bottom of the throttle body to make sure the bellows was connected correctly. any leak in the system will trip the code.

 

Don't forget. Anytime you make an airflow change you will need to drive 50-100-200 miles before you notice any change that would be from the mod. Performance can actually be crappy for awhile until the computer adjusts (relearns). Apparently, there is a re-learn procedure for the car but I've found it easier to just drive it around for a full tanks of gas. Although, if a mod results in it running so crappy it won't stay running, well then, bad mod. go back.

 

The part numbers I just read off both my C5 and C6 are both 25318411 from the MAF itself. Both MAF's are the same so I assume you are talking about the Z06.

 

any feedback/update re: results of rotating the maf ?

 

If you take into consideration that the stock MAF with screen flows, over 850 CFM from the factory, you will see its a waste of time unless you have rebuilt your motor to race specs and added big heads and cam.

Just marketing hype! Ask any real F body racer!

AK

 

Zig,
I agree with your theory here. Yesterday I rotated my MAF 90 degrees so that the diffuser is now horizontal and aligned with the throttle body butterfly valve. So far I am VERY impressed with the way my car is running. I would not be surprised if it's making more power. What is up with today's engineers? The diffuser and the Throttle body butterfly valve should be aligned to minimize turbulence.

 

can you elaborate ? do you still feel a difference ? is it pronounced at a certain point ? how does it feel when you gradually open the throttle ?

 

Yes, there's a difference: I have to worry more about wheel spin. I'm experiencing it more at part throttle now (traction events seems to come up on the DIC more frequently) and acceleration is more immediate.

But I'm going to give the car a week or two and let things settle before I say whether or not this is worth doing. My initial impression, though, is it feels very promising. Hopefully the PCM doesn't tune away the improvement.

 

a quick test to prove if there is any immediate change that can be attributed to the mod. is to drive it a awhile one way then put it back, drive it a bit, change it again, drive it a bit. any change (good/bad) ? true, that won't show how it's gonna react in the long term. i suspect the pcm won't program it out. if the pcm is using an algorithm then i think the pcm should love it. if the pcm is using hard coded figures then it would probably need a tune.

what other mods. do you have ? you're breaking it loose at part throttle while in motion in gear ??

 

I'm convinced there is a change.... I'm just afraid the PCM will tune it away. Today it's in the 50s and sunny and I'm noticing wheel spin on surfaces, that I normally travel, at part throttle--full throttle will cause a spinout I'm sure. The engine also sounds and feels crisp in the cooler temps and is running much stronger than before. ...and i have no mods yet and I'm breaking loose while in motion. I'm also aware as temps drop the road surfcace becomes cool and the Z51 tires do not hook-up as well and will more readily spin.

 

I agree with the guy about removing the screen and rotating the MAF. As it turns out, I was one of the few that did throw codes anyway. Instead of buying a new MAF, I decided to purchase one of those "Tornado" inserts to help straighten the airflow. Who knows if it really swirls or not.

Anyway, since the Tornado install, it runs great.

 

OK. I have lived with this MAF adjustment for nearly to weeks now and can honestly say it was worth doing. The additional quickness and responsiveness remains.

Guys/Gals: give this a shoot. I don't think you’ll be disappointed.

 

Blackwig & screen out - codes. Blackwig & screen in - no codes. It can be re-installed if it was removed carefully.

 

Air cleaners, headers, cam, fast intake manifold, ported heads, NO screen, ported TB, and tuned....no codes.


Soon no MAF

 

but, how has the temp. been around there lately ? has it been cooler ? could the responsiveness be attributed to a drop in temp . ?

 

don't count, you got tuned.

so far i've been able to add; B&B bullets, x-pipe, 'homemade ram-air', maf mod and ngk tr5 spark plugs without throwing any codes. i did, however, throw a 'cat below efficiency' when i exhaust wrapped the section of pipe from the exhaust end of the cat to the x junction. i started pulling too much heat through the cat and popped a p0430 code. unwrapped the section, gave it a tank of good gas and wha'lah... code went away all by itself.

i have noticed that the car will start to run with more of a up and down idle when the maf gets dirty.

i've removed my screen, cleaned the maf (carefully - used q-tips, etc.), removed the rear diffusor from the maf (boy, was that a bit of work, i didn't have my dremel, had to use a hacksaw blade, a file, and some sandpaper). the only diffusor in my maf is the front (silver) one. I polished it and aligned it with the throttle body butterfly. I've also removed the stock bellows, replaced it with a 4" rubber joint from home depot.

i have an mn6 f55, I hardly ever go above 2500 rpm while in traffic, in fact that actually would be a bit high. i mostly cruise @ approx. 1500, shift around 2k and only go up to 2500 when i want to pull away and create some space between myself and eveyone else.

ps. i haven't had any problems with the clutch sticking/sucking to the floor since the pedal springs came out.

 

have you tried it without the 'Tornado' but with the MAF rotated ?

 

Removing the screen shouldn't throw a code. A loose intake will.