mail order TB and MAF porting?
08-05-2016, 12:59 AM
#1
mail order TB and MAF porting? anyone know if somebody on here does decent mail order porting of TB's like how frost does his mail order tunes? Have a spare TB laying around i want to get ported but the person i was going to use (potz speed and performance) seems to have closed
08-05-2016, 12:51 PM
#2
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I just don't get why you'd send your TB out for porting
(unless you want polished / powder coated). The basic
airflow related stuff is so simply done and costs you maybe
$20 in tools if you started from nothing (a cheap electric
drill or die grinder, a drum sander kit and rolls, and maybe
a flat file for the bump stop). Harbor Freight or eBay.
Do not port your MAF. Just don't.
(unless you want polished / powder coated). The basic
airflow related stuff is so simply done and costs you maybe
$20 in tools if you started from nothing (a cheap electric
drill or die grinder, a drum sander kit and rolls, and maybe
a flat file for the bump stop). Harbor Freight or eBay.
Do not port your MAF. Just don't.
08-05-2016, 01:41 PM
#3
I just don't get why you'd send your TB out for porting
(unless you want polished / powder coated). The basic
airflow related stuff is so simply done and costs you maybe
$20 in tools if you started from nothing (a cheap electric
drill or die grinder, a drum sander kit and rolls, and maybe
a flat file for the bump stop). Harbor Freight or eBay.
Do not port your MAF. Just don't.
(unless you want polished / powder coated). The basic
airflow related stuff is so simply done and costs you maybe
$20 in tools if you started from nothing (a cheap electric
drill or die grinder, a drum sander kit and rolls, and maybe
a flat file for the bump stop). Harbor Freight or eBay.
Do not port your MAF. Just don't.
as far as the MAF goes ive seen people cut the metal splitter out of it that's what im referring to, not the sidewalls and sensitive resistors.
08-06-2016, 12:35 PM
#4
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Cutting the main vane grossly increases the facing area
and jacks the calibration quite a bit. On an 85mm I did
this to for an experiment, it also made the frequency
much more unstable. I'd stop at descreening.
and jacks the calibration quite a bit. On an 85mm I did
this to for an experiment, it also made the frequency
much more unstable. I'd stop at descreening.
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08-12-2016, 01:09 PM
#15
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a screened 75mm. The "screen" pressure drop is not small,
in my long-ago testing it equaled the stock-lid drop and
everyone replaces the stock lid, for cause. Now either one
descreened will be a large improvement (drop across the
MAF went to unmeasureably low just from that, tested
back-to-back).
When (or before) you get into porting the TB, make sure
you're even capable of opening it all the way to blade
dead center (forget TPS readings, they're secondhand).
You'd leave more on the table with a short cable draw
than you do with any TB turbulence (which is all you
are working on; throat diameter does not change, just
the smoothness of entry).
08-12-2016, 03:12 PM
#16
A screened 85 will drop less pressure at equal airflow, than
a screened 75mm. The "screen" pressure drop is not small,
in my long-ago testing it equaled the stock-lid drop and
everyone replaces the stock lid, for cause. Now either one
descreened will be a large improvement (drop across the
MAF went to unmeasureably low just from that, tested
back-to-back).
When (or before) you get into porting the TB, make sure
you're even capable of opening it all the way to blade
dead center (forget TPS readings, they're secondhand).
You'd leave more on the table with a short cable draw
than you do with any TB turbulence (which is all you
are working on; throat diameter does not change, just
the smoothness of entry).
a screened 75mm. The "screen" pressure drop is not small,
in my long-ago testing it equaled the stock-lid drop and
everyone replaces the stock lid, for cause. Now either one
descreened will be a large improvement (drop across the
MAF went to unmeasureably low just from that, tested
back-to-back).
When (or before) you get into porting the TB, make sure
you're even capable of opening it all the way to blade
dead center (forget TPS readings, they're secondhand).
You'd leave more on the table with a short cable draw
than you do with any TB turbulence (which is all you
are working on; throat diameter does not change, just
the smoothness of entry).
donor TB opens fully, since the day I ran into an issue with a car not going to WOT due to this exact issue I check this on all my lsx cars