MAF descreen
Registered User
Joined: Dec 2003
Posts: 139
From: Lafayette, LA
Re: MAF descreen
A Pro would be freeing up the intake track to accomodate more air flow.
A Con would be that (I think but dont quote me) the Screen is there to smooth airflow to give the MAF a more accurate reading.
I descreened my MAF on my 96 camaro, it resulted in a SLIGHTLY rougher idle and it felt like (although it may only be wishful thinking) I picked up some *umph* in the 50-70mph range.
I haven't descreened the MAF in my LS1 because I looked in the intake track and saw some grass or hay or something stuck up against the screen, so I decided it wouldn't be worth the minimal HP gain to worth risking screwing up my MAF (expensive!).
A Con would be that (I think but dont quote me) the Screen is there to smooth airflow to give the MAF a more accurate reading.
I descreened my MAF on my 96 camaro, it resulted in a SLIGHTLY rougher idle and it felt like (although it may only be wishful thinking) I picked up some *umph* in the 50-70mph range.
I haven't descreened the MAF in my LS1 because I looked in the intake track and saw some grass or hay or something stuck up against the screen, so I decided it wouldn't be worth the minimal HP gain to worth risking screwing up my MAF (expensive!).
Last edited by Z28COnrad; Oct 30, 2004 at 04:39 PM.
Registered User
Joined: Aug 2001
Posts: 420
From: Poway CA, where GOD and the sun always shines
Re: MAF descreen
O.K. here's the deal:
If you have a M6 vehicle, it is no big deal, you will only have to adjust the A/F ratio with a programmer.
If you have an A4 vehicle, it becomes a different animal all together, as the PCM uses the MAF & Speedometer sensor readings to shift the vehicle.
I have an 01 A4 (3.73's, Y3000 2.0 STR), and installed ported MAF ends (no screen) on my vehicle, one week before a dyno tune (for a TC change). For that one week, I was experiencing upper RPM detonation, and very rough shifts.
Once on the dyno, My idle A/F ratio was 16.0 (vise 14.7 with stock MAF ends) my wide open A/F ratio was @ 15.6 DUE TO THE PORTED MAF ENDS. Ported descreened MAF ends will ALWAYS set a lean condition.
After the dyno tune, my idle A/F ratio was again 14.7, and my WOT was 13.5.
The dyno tuner spent 4 1/2 hours, and 7 pulls to correct ALL the existing conditions on my vehicle due to the MAF ends and the higher stall converter. I was able to pickup 10RWHP from the ported descreened MAF ends.
My best advise to you, is that if you are not going to have the PCM settings manipulated (using HPPIII, Preditor, or dyno tuning) LEAVE THE MAF ALONE.
JMHO
SteveC
If you have a M6 vehicle, it is no big deal, you will only have to adjust the A/F ratio with a programmer.
If you have an A4 vehicle, it becomes a different animal all together, as the PCM uses the MAF & Speedometer sensor readings to shift the vehicle.
I have an 01 A4 (3.73's, Y3000 2.0 STR), and installed ported MAF ends (no screen) on my vehicle, one week before a dyno tune (for a TC change). For that one week, I was experiencing upper RPM detonation, and very rough shifts.
Once on the dyno, My idle A/F ratio was 16.0 (vise 14.7 with stock MAF ends) my wide open A/F ratio was @ 15.6 DUE TO THE PORTED MAF ENDS. Ported descreened MAF ends will ALWAYS set a lean condition.
After the dyno tune, my idle A/F ratio was again 14.7, and my WOT was 13.5.
The dyno tuner spent 4 1/2 hours, and 7 pulls to correct ALL the existing conditions on my vehicle due to the MAF ends and the higher stall converter. I was able to pickup 10RWHP from the ported descreened MAF ends.
My best advise to you, is that if you are not going to have the PCM settings manipulated (using HPPIII, Preditor, or dyno tuning) LEAVE THE MAF ALONE.
JMHO
SteveC
Last edited by SteveC; Nov 1, 2004 at 09:38 AM.
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