MAF placement... A thought - The Saab Link Forums

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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 09-24-2009, 04:37 AM   #1
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MAF placement... A thought

Hello,

I don't currently have a car, it's making me cry on the inside. But that aside, I've been talking to a lot of the DSM boy's in my area (at a local auto-x, to start) and I saw something rather interesting that I didn't know about. And here I am wondering if it could/would apply to a T7 saab... (I've never owned one, but I get the gist of the differences...)

So, the conventional MAF setup is simple, as everyone knows; MAF after airfilter, presto, you're done...

I've seen numerous 240's with their SR20DET swaps, and a skylined swapped (what? RB26?) 240x running with what they call a 'blow-by' MAF installation: That is, the MAF is located between the cold side of the intercooler and the throttle body itself... ONE of the reasons (and I can't really think of any other reason, actually) is so that these cars can run a large external wastegate that blows off to ATMOSPHERE without the entire check engine / running rich causing issues type thing...

And it makes sense; The MAF is accounting for AIRMASS *after* the car has blown-off the air from the atmospheric dump valve, thus, it's values are not affected by such a dump...

Now, I've been asking if the MAF is receiving/recording correct readings, as every 'normal' MAF setup i've seen is on the non-pressurized directly after the airfilter routine, and every response that I've gotten is 'airmass is airmass'.

So, basically, has anyone tried this? Is their fault in this logic? A few of the cars (specifically the RB26' swapped 240sx with something like a .76 air turbo..) are *very* worked on, nice cars, and running *very* well -- Point is, it doesn't seem to be a 'backyard' hack that us in Maine are familiar with... (Said car apparently puts down 430whp on base boost alone, and over 900whp on full boost / race gas).

Discuss; I am beyond curious...

Cheers,
Benjamin
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Old 09-24-2009, 05:14 AM   #2
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Nordic did one like that years ago. Took quite a bit of tuning to get it right. Then you have more oil on that side so maf fouling is an issue.
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2.0 GOOSE 500whp + 8500rpm = 11.06 @125 E85
Viggen 439whp / 447tq 12.43 @114 on Gt2871.64, (Now 511whp Gt3076)
Nordic E85 9-3 SS Aero 320hp / 350ftlbs
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Old 09-24-2009, 07:43 AM   #3
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Was reading about this recently on a Turbo Buick site. That would be all the oil that you generally find in the intake pipes. We know how much T7 cars love oiled filters.

http://www.gnttype.org/techarea/engine/mafrelocate.html

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can be prone to failure due to increased localized stresses in the hole penetrations
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Old 09-24-2009, 05:36 PM   #4
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It was a good point. Makes sense about the oil though. I've heard of OBD2 GM's being converted back to OBD1 for the sake of tuning simplicity. Is there way to make T7 into T5? I think thats what we're all getting at here.

Just thinking about mounting the GN MAF after the intercoler, I think my heater core in my Jeep is bigger. LOL.
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Old 09-25-2009, 10:00 AM   #5
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Yes, if you can T5 a c900, I'm sure you can T5 a T7. Most Buick's these days are running an LT or LS-1 maf with a "translator"
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Old 09-25-2009, 10:28 AM   #6
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I've seen the charge pipe MAF setup on a few Saabs looking on Swedish sites.

As others have pointed out, there are some pretty obvious trade-offs...and I can't really see much of an obvious bennefit from doing such.
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