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Would post photos of your engine?

Old 12-05-2014, 02:42 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #201 (permalink)
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Quote:
Originally Posted by scarceller View Post
The PMAS MAFs are designed for blow through. You would put it right at the Throttle-body to reduce this air flow latency.
Very interesting, lots of good info, thanks for sharing.

This placement suggested ahead of the throttle body would traditionally be a no-no for a MAF because of the turbulence caused by the nearby tight radius bends, and/or tapered housings. For instance, the back of this C2T intercooler is a large tapered "V" as it transitions to the ~3" round throttle body ring.



I cannot see how placing the MAF in this area directly above the throttle body will result in consistent and reliable airflow readings.

That leaves positioning the MAF to be a draw-through, in front of the turbocharger, like on a 993T.
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Old 12-05-2014, 10:02 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #202 (permalink)
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I'm worried about latent readings.
Old 12-05-2014, 11:48 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #203 (permalink)
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The PMAS MAF is by design for blow through. I'd suggest if you try one you do pull through first then move it, you'll be surprised.
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Old 12-05-2014, 11:55 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #204 (permalink)
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Yeah, I think Chris is stating that the IC neck angle possibly will not flow straight enough for the MAF to read correctly. Too sharp of angle?
Old 12-05-2014, 12:13 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #205 (permalink)
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That is possible. I do have this MAF directly on the 90deg boot in my stock 3.2L but it's not a turbo. I will say that other MAFs I tried could not be located that close to the boot but this MAF had no issues.

Quote:
Originally Posted by Tippy View Post
Yeah, I think Chris is stating that the IC neck angle possibly will not flow straight enough for the MAF to read correctly. Too sharp of angle?
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1984 911 Carrera Cab M491 (Factory Wide Body)
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1964 356SC (SOLD)
1987 Ford Mustang LX 5.0 Convertible
Old 12-05-2014, 12:41 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #206 (permalink)
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Quote:
Originally Posted by scarceller View Post
Yes, by conventional accounts that MAF placement is hardly ideal, too close to the turbulent air coming in from the filter, too close to the tight 90-deg boot.
But the MAF is at least installed in a straight section of tubing.

Not arguing that they're designed for blow-through (unlike most MAFs), just that straight-ish tubing is scarce on a 930, really only on the intake side.

I can see an air recirculation plenum, or the turbocharger's steel 2.75" intake tube, being modified to take a MAF.
Will it work any better than other VE-based tuning systems out there?
Only testing will confirm.
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Old 12-05-2014, 12:59 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #207 (permalink)
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Chris, good point on the length of tube. That section of tube is supplied with the MAF, not only that I sent the intake including the Boot, the MAF tube and the filter and PMAS flow benched all 3 components and sent me the actual curve from my setup.

But I agree that you need at least 6-7" of straight tube for the MAF to sit in.

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1984 911 Carrera Cab M491 (Factory Wide Body)
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Old 12-05-2014, 01:08 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #208 (permalink)
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