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Removing Gtr Afm Screens

gtr fan

By gtr fan,
in Engines & Forced Induction

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gtr fan Experienced

gtr fan

Posted
Posted

Hi All,

I am going to install some garrett turbos on my gtr and will be looking for around 300-330 rwkw and am trying to avoid the cost of buying Nismo AFM's. I read an old article that Tillbrook Automotive in SA (I think) removed the screens standard AFM's, which allowed a bit more resolution with tuning.

Does anyone else agree with this method for what I am chasing or should I be buying Nismo AFM's?

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https://www.sau.com.au/forums/topic/307907-removing-gtr-afm-screens/
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Blitz Grand Master

Blitz

Posted
Posted

Wait and see how your current afm's hold up before spending money on replacements.

My factory afm's were fine up to 350awkw in my last GTR.

Aside from that, i can't see how there would be any great benefit in removing the mesh.

gtr fan Experienced

gtr fan

Posted
  • Author
Posted

Thanks Nick.

The article quoted the following food for thought;

de-screen the existing 65mm afm's, which adds around 8% cross-sectional area. This is enough that the tuning process with the Power FC is given more resolution at boost levels close to 1.5 bar.

I will just leave them as they are then and see how it goes.

Blitz Grand Master

Blitz

Posted
Posted

Interesting.

Though I have heard of it being done, if I got to the stage where I was maxing my current afm's I would rather replace them all together than remove the mesh, as I see that as more of a bandaid solution.

I guess it also comes down to the car and tune in question - If modifying the stockers works in your situation, great :sick:

gtr fan Experienced

gtr fan

Posted
  • Author
Posted (edited)
or put a Vi-pec plug-in in it and throw the bastards away.

Whats a Vi-Pec worth? Would also have to plug in a Map Sensor?

No real disadvantages with getting rid of AFM's?

Edited by gtr fan
paulr33 Grand Master

paulr33

Posted
Posted

removing the mesh would achieve zero, if anything as status said, it would cause reversion and probably make it run worse

you can stretch the point at where an AFM maxes, so effectively keep using it even though it maxes out (MAP sensor style) and it is OK, but if you max the AFM at 4000prm this is bad and you need to change to larger scale items. maxing them at 6700rpm is probably OK (map sensor style).

please run up on map sensors and how they work before going to them just because, you can probably make 300rwkw OK with the stock afms

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

They max out around 280-300rwkw. However if your tuner is decent and you trust them... you can tune past the max.

It's certainly been done before!

Just be warned though that in varying temp conditions, the tune won't be 100% so it'll be "safer" past the max point that you would otherwise have if AFM's were replaced.

IMO just get the Nismo AFM's from perfectrun.

At the end of the day, your AFM's are more than likely dying anyway after 10+ years. So little "quirks" during tuning can pop up, even intermittent problems you can spend months chasing only to find out its a AFM playing silly games

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

And still 2nd hand, which presents the same issues still with regards to reliability and failure.

Seems around the 10years marker that they start to degrade. Obviously a broad assumption (some sooner, some last longer).

But given the issues i've seen with people & AFM's, after 10 years especially if you are upgrading parts for more performance... AFM's are just a given to chance to brand new items.

STATUS Grand Master

STATUS

Posted
Posted
And still 2nd hand, which presents the same issues still with regards to reliability and failure.

Seems around the 10years marker that they start to degrade. Obviously a broad assumption (some sooner, some last longer).

But given the issues i've seen with people & AFM's, after 10 years especially if you are upgrading parts for more performance... AFM's are just a given to chance to brand new items.

TBH i agree, most of the tuning issue's we run into with skylines revolve around coilpacks and afm's.

Duncan Grand Master

Duncan

Posted
Posted

yes and remember that rb20 or rb25 afms still max out at the same airflow...they just have larger cross section. you need to decide which problem you are trying to solve - restriction (get rb25 or rb20 ones) or outside the resolution/over 5v (get z32 or nismo ones)

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