Z32 Afm

[RBWPN.6]

Hey Guys couldnt find a thread for this one even though its prob around got my self a z32 and just wanted to know if the myth is true that if u take the mesh cover off do u get more power hopefully i used the right description for wat im talkin about taking off the metaly wirey stuff ahhaa

[joeyjoejoejuniorshabadoo]

Leave it on!

[Richieb]

In theory you will get better air-flow, mine were missing when I got my car, but everyone seems to be freaked about them missing, ... not sure why tho.

Is there someone out there who can shine more light on this matter?

I guess it is to stop debris entering the tracht, but if one is careful, then what diff would it make in reality?.. only better flow..!

[R31Nismoid]

Hey Guys couldnt find a thread for this one even though its prob around got my self a z32 and just wanted to know if the myth is true that if u take the mesh cover off do u get more power hopefully i used the right description for wat im talkin about taking off the metaly wirey stuff ahhaa

You wont notice a difference.

Leave it on

[Richieb]

Hmmm..! someone butchered mine then..!!

I guess there's theory here too... like not letting air enter the area un-distributed... sorta like spreading it out.

When we dyno'd it, we went to replacements, as the MAFS were giving odd readings at times, but we could not pin-point it..!!

Could be this metal grid that wasnt distributing air-flo 'more-evenly'

Anyway, 'tis true, I kept them on. You have to remember that its not about how much air can enter, but what air can be metered accurately.

I go with the "Leave it on" brigade. (plus theres the added benefit of "foreign body ingress" avoidance...!

[RBWPN.6]

Thanks Guys needed that help coz i herd u get more power outta it but didnt wanna go rip into my nice new z32 afm shit aint cheap ahaha thanks...skate safe every1

[joeyjoejoejuniorshabadoo]

the mesh creates some sort of vibration that is required for the afm to read properly. taking this away will aparently LOSE performance...

[bombtrack]

the mesh creates some sort of vibration that is required for the afm to read properly. taking this away will aparently LOSE performance...

Hamish, please explain!

[joeyjoejoejuniorshabadoo]

it was poseted about 2 weeks ago...

here

[GeeTR]

Nissan recommend strongly against removing the mesh, leave it on. Theres a fine coating of Molybdenum, that scrubs the incoming dark matter out of the air. The dark matter can foul valve guides, pit compressor wheels and burn out mufflers prematurely.

I knew a guy, who had a friend, who's battery ran flat with the headlights on in 5hours and 4mins... this was 29mins longer then another guy who had the mesh taken out. Does a positive ionic charge caused by the mesh make the battery last longer? "You be the judge"

Edited August 8, 2007 by GeeTR

[bombtrack]

Thanks for that. Makes sense.

[GeeTR]

I try

[Medium Dave]

Dark matter? sounds like someone has been watching too much star trek...

My personal theory is that it evens the spread of the incoming air, probably more useful at low pressures for distribution accross the sensor, but if you have a look at taps - ones without the mesh covering the outlet and the ones with mesh covering the outlet, run them at different pressures and see how the water behaves. Water coming out taps without mesh will dribble out the side wheras the water from a tap with mesh will spread evenly accross the mesh, then move through... I dont know, thats just me and I could be wrong...

[GeeTR]

the mesh creates some sort of vibration that is required for the afm to read properly. taking this away will aparently LOSE performance...

I searched around and couldn't find anything regarding this vibration. Are you referring to compressor reversion?

Its been toted by many well known workshops and magazines that removing the mesh is one of the first mods one should do, if power was lost or drivability worsened, i think someone would have picked it up. There are many AFM's that don’t use mesh, WRX's are an example that come to mind.

Water coming out taps without mesh will dribble out the side wheras the water from a tap with mesh will spread evenly across the mesh, then move through...

The flow is more even but the mesh in that example is a lot more restrictive, not sure if you can compare pushing a medium 784 times more dense then air with 3bar behind it, to a AFM

Edited August 8, 2007 by GeeTR

[Guilt-Toy]

this gives the AFM a more reliable reading. removing the mesh will give you a rough idle and will also give you bad fuel economy.

[bombtrack]

Removal of some unwanted material thru interaction/chemical reaction with a catalyst seems like quite a reasonable explanation to me... albeit unproven.

Introducing a source of turbulence and restriction for means of better flow makes less sense as an explanation as to why it is there.

No idea though, hence the question. My 2bob.

[GeeTR]

this gives the AFM a more reliable reading. removing the mesh will give you a rough idle and will also give you bad fuel economy.

Have you seen / felt before and after, or are you assuming? A back to back would be interesting.

I would have thought running a pod filter right on the AFM would replicate the mesh's job. *thinks* wonder if pod setups would suffer these issues people talk of.

[Richieb]

Well...

Never effected economy on mine, it was superb.... idle... beautiful am afraid, never a complaint from me.

BUT, when it came to dyno time, one had the dreaded disease, so both were changed. There was merely a comment about the fact the mesh was missing, nothing more.

My next point is they would flow more air by simple dynamics at WOT, can't be disputed this part though. (so air+fuel increase)

My car before, did have abnormal power output when compared with a normal set-up, and no one could really say why... maybe..!!

I have to go with M Dave, its to help spread the incoming charge more evenly I think. Basically, the air input is spread more evenly, and thus the charge can be gauged more accurately. BUT at WOT, it has to get in the way, thus restriction!

Dark matter... probably cr@p in a more polite manner..!, but what happens when it eventually gets pulled in, but in bigger amounts as it becomes loosened by its sheer size/mass..??, do the turbos ignore this, 'cos its been through the 'Dark matter' filter?

To remove, or not to remove, that is the question. For 'tis better at low to mid throttle openings, yet can get in the way at WOT.

There, I had to have my say, feel better now.

[MANWHORE]

The afm mesh deosnt' cause much restriction at all. If you think about it - its a really thin mesh.

Much more significant gains can be had else where e.g. your rippled air filter - turbo intake pipe. Each of the pipes as it leads onto a silicon join - there's an edge there.

I have listed just two things which would cause more restriction than the simple mesh.

Leave the mesh alone

[Richieb]

True, the average inlet has soo many restrictions to air -flow.

One way to prove the theory of restriction, if anyone would like to try it is this..

Place said mesh in way of air-flow, and see if it is pulled into the engine..!!, or better for the wallet, blow air at it, and see if you can move it, or do the maths for it. Work out its effective CSA, and then apply as a percentage, and then say it would not obstruct air-flow.

Aaaanyway, we digress.

Simple is easier flow of air, less twists and turns etc makes for better flow, no matter how you view it.

I have seen it removed, and I have to say there was(to my interpretation, at high RPM, better flow... the dyno showed it as such. The reason I think it is there is to aid even distribution of air incoming as a whole, by which the sensor can get a more accurate representation, and to keep

lumpy bits out too.

However, I fail to see that a coating of molybdenum, or anything else will make it disappear.

BTW, there are theorys about having a rough "Wall" to the inlet as being better for flow, rather than as we were lead to believe in the first place..!, look at Thorpeys swim-wear.!

Over..