Noob with TB/MAF question
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From: The other, other, other A-Town, NM
Noob with TB/MAF question I'm picking up my 2001 Z28 M6 only Monday. It is almost stock so I wanted to get started with a few simple mods. I've read that the stock MAF is good up to around 500hp, but will I see any gains by putting a higher flowing aftermarket MAF on my car. The same question applies to a ported TB. I've used the search button, but I haven't found anything that actually answers my question Thanks, any help would be great.
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From: In the Keebler elves freg'n tree house eating freg'n cookies
A larger/ported MAF is only good if you alter your intake first, but dramatically at that. Descreen it if you want. A ported TB is the total ****. Articles say that you dont need to do it, but dude! my low end torque is soooo much better. I used to cruise 73MPH @ 2000 Rpm, immediately after the porting it was 80-85 @ 2000 RPM. make sure you get that TB bump way smoothed down, in fact perfectly smooth, almost a flat angle as you can make it. It takes work. I used a dremmel, then sanded, then wet sanded. It was worth the time.
Click the link on my sig for what you need.
I've got 10's with the stock MAF on my heads/cam car. Also, pick up an airlid as mentioned. My TB and an airlid should get you .3 ET reduction in the 1/4 and probably 25rwhp.
Scott
I've got 10's with the stock MAF on my heads/cam car. Also, pick up an airlid as mentioned. My TB and an airlid should get you .3 ET reduction in the 1/4 and probably 25rwhp.
Scott
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From: The other, other, other A-Town, NM
Thanks guys. I already have an SLP air lid, but I'm definitely going to port out my TB or just buy an aftermarket one. I'm not sure if I want to risk doing it myself. 
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From: The other, other, other A-Town, NM
Originally Posted by xxtinktFormula
A larger/ported MAF is only good if you alter your intake first, but dramatically at that. Descreen it if you want. A ported TB is the total ****. Articles say that you dont need to do it, but dude! my low end torque is soooo much better. I used to cruise 73MPH @ 2000 Rpm, immediately after the porting it was 80-85 @ 2000 RPM. make sure you get that TB bump way smoothed down, in fact perfectly smooth, almost a flat angle as you can make it. It takes work. I used a dremmel, then sanded, then wet sanded. It was worth the time.
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Ported TB should make zero difference to
low end torque (at WOT) because the
throttle is not limiting the airflow or MAP
at all, in the first place - it's pure pumping
volume at near ideal volumetric efficiency.
As to part-throttle, well, that's so pedal-
dependent you can't extract the benefit
of smooth putty from the blade's dominant
effect (like, that's why it's a throttle).
On an A4 car you could see an increase in RPM
if you were forcing the TCC to slip. Attributing
this to the increased power would be a mistake
I expect.
But, ported TB = good.
Ported MAF = new hobby, "post repeated complaints
about why is my car pinging and I think it's running
rich but I don't know".
low end torque (at WOT) because the
throttle is not limiting the airflow or MAP
at all, in the first place - it's pure pumping
volume at near ideal volumetric efficiency.
As to part-throttle, well, that's so pedal-
dependent you can't extract the benefit
of smooth putty from the blade's dominant
effect (like, that's why it's a throttle).
On an A4 car you could see an increase in RPM
if you were forcing the TCC to slip. Attributing
this to the increased power would be a mistake
I expect.
But, ported TB = good.
Ported MAF = new hobby, "post repeated complaints
about why is my car pinging and I think it's running
rich but I don't know".
forum at the top of the main index of this site for lots of useful info 
- POLISH the TB (don't "port"....just clean any edges and smooth the entry...don't try to make it larger)
- get the SLP bellows (that connects the MAF and TB) that has one rib instead of a bunch
My car was rich from the factory so descreening the MAF helped to lean it out some (need AutoTap for this). You already have a lid and the LS6 manifold so there really isn't much more to do on the intake side. I would say next thing to plan for it Hooker LTs and a new catback/true duals (I think Hooker catbacks use a BlowMaster ie: FlowMaster muffler).
- get the SLP bellows (that connects the MAF and TB) that has one rib instead of a bunch
My car was rich from the factory so descreening the MAF helped to lean it out some (need AutoTap for this). You already have a lid and the LS6 manifold so there really isn't much more to do on the intake side. I would say next thing to plan for it Hooker LTs and a new catback/true duals (I think Hooker catbacks use a BlowMaster ie: FlowMaster muffler).
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From: Troy, AL
Why "don't port" the TB? Just polishing is not going to make a measurable gain. Porting it will. Just don't port the MAF.
I think this is LS1Tech confused the TB with the MAF day or something!
I think this is LS1Tech confused the TB with the MAF day or something!
Your not increasing the bore of the TB at the blade (ie: not "porting" it). Your trying to smooth the entry path from the front edge (which should be knife edged some to reduce frontal area) in to the blade so the air does not have any more restrictions that it needs (which to me is polishing).
The smallest cross-section in the TB is prior to
the blade seat, where that ridge is. The porting
job should ensure that the blade seat circle is
the narrowest point, blend the transition smooth
for least turbulent flow and eliminate the "dog
whistle" edges on the PCV and IAC ports so the
cone/ramp there is not a turbulator, too.
the blade seat, where that ridge is. The porting
job should ensure that the blade seat circle is
the narrowest point, blend the transition smooth
for least turbulent flow and eliminate the "dog
whistle" edges on the PCV and IAC ports so the
cone/ramp there is not a turbulator, too.
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From: Troy, AL
Ahh, ok, we're just calling the same thing by a different term. To me, polishing is more cosmetic...makeing it shiny and smooth but not really changing the shape.
So yes, remove the lip, smooth the transitions, but leave the actual blade contact area alone.
So yes, remove the lip, smooth the transitions, but leave the actual blade contact area alone.
Originally Posted by Colonel
Ahh, ok, we're just calling the same thing by a different term. To me, polishing is more cosmetic...makeing it shiny and smooth but not really changing the shape.
So yes, remove the lip, smooth the transitions, but leave the actual blade contact area alone.
So yes, remove the lip, smooth the transitions, but leave the actual blade contact area alone.
cosmetic......pshh......if it doesn't make it run faster I don't need it
