Gents, Does removing your airflow meter screens on a N/A give you any more power? Regards, Joel

in theory yes, as there is less restriction in the intake, therefore more air can flow and more air + more fuel = more power but i personally havent noticed the difference, so i put mine back in i have a 2.5" exhaust from the cat back and extractors if that is any help

Quote: Originally Posted by Jazza in theory yes, as there is less restriction in the intake, therefore more air can flow and more air + more fuel = more power but i personally havent noticed the difference, so i put mine back in i have a 2.5" exhaust from the cat back and extractors if that is any help Thanks for the reply.

i wouldnt have thought the screens would cause that much resistance to be noticable in power, i may be wrong though

I took mine out. could barely notice a difference, but still left them out. Those along with other mods you will notice a difference. (ie k&n panel filter, cold air, etc)

there is a website that I was reading that actually did flow test revealing where the restrictions are. The mesh on the afm, the 90 degree bend down to the turbo (on turbo models obviously), and the standard cross over pipe coming directly off the turbo. I don't think it would make the world of difference in an NA, with a few mods along those lines, you may notice something. I personally think that the more things you do like that, when you notice power gains, it's all psychological, is not actually happening... you just want to think it is. Nick

i wouldnt remove them, the screens protect the meter element incase of backfire and any impurities

autospeed did that testing i believe .. on the VLT intake system .. The only downside to removing the first mesh is that if something makes it past your air filter (ok, not likly) it can damage the wire on the AFM ..

on my old AFM it had a massive hole blown through the mesh, i dread to think how it happened.

i wouldnt really recommend takin em out cause there in for a reason, i remember my mate took mine out sayin, yer itll give u less air restriction and **** like this, it ended up snappin the circuit in the afm, hello 60 bucks and a new afm. if u wanna do anythin for ur airflow take that small shroud off and cut the whole side out of ur airbox, but the way to go is high flow filter and cold air i spose.

Agreed, I wouldn't recommend taking it out. Mind you, i'm surprised my AFM is still going after the mega backfire I had .. blackened and bent the K&N filter, blackened and bent the mesh's, and shattered the airbox into about 6 pieces, but the AFM still works Some original photos have not been recovered yet.

Lord-Data i killed my first AFM with an LPG backfire the other day.... I also killed my 4th ****ing air box. My K&N filter wasnt too bad though.

Its great isnt it Note to self: do NOT pump pedal when starting on LPG *grin* .. thats how I did mine .. only happened once .. despite all my problems on petrol, my LPG system is still very much in tune .. still, would love to strip off this impco **** and chuck some gasresearch on there Some original photos have not been recovered yet.

what causes a backfire through the air intake anyway?

With LPG, its because there is fuel (lpg) in the air intake .. LPG is mixed into the air intake duct on an NA about where the turbo sits on a turbo .. halfway between the AFM and the throttlebody .. Putting your foot down on the pedal while cranking means, LPG in intake, Throttle plate open wide, and spark plugs firing .. doesnt take much for one of those to ignite extra fuel back up the intake with a valve opening or not closing quick enough while cranking, and hence, backfires out the intake .. happens with carby petrol engines too in a similar situation, except its more fuel vapours then .. EFI petrol cars generally dont suffer from it at all .. (this is also why LPG on a GenIII requires an intake manifold modification .. the GenIII engines used plastic intake manifolds, and if there is an LPG backfire, it will shatter Some original photos have not been recovered yet.

my ex blew here airbox to bits in her VP calais..LPG backfire, scared the living hell out of her. I don't have to worry about my airflow meter, it's gutted. Gotta love Microtech. cheerz morepsi

A mate of mine has a VR Berlina on gas, when he bought it, half the clips for the airbox were missing. When he went to the wreckers looking for a new bottom for his airbox they asked if he had LPG, now we know why they were missing.

Quote: Originally Posted by joel Gents, Does removing your airflow meter screens on a N/A give you any more power? Regards, Joel I found that with the front screen removed I was not getting a good fuel/air ratio and it felt to lean when driving, especially in 2nd gear. Put the front screen back in (cleaned the carbon of it first) and left the back one off as it serves no purpose at all and it went allot better. I'm also using an XF TB. Maybe the screen is also there to soften the air so that the 3 hotwires get a better distribution of air. Joel.

I figure Nissan know more about building engines than I do. I left it on.

Don't take them off, i tried it already and my car drove really s**t for some reason. It was just running really ruff and sounded like it was misfiring. So i wouldn't reccomend it from personal experience.