[flash]

Please carefully inspect your MAF. We are particularly concerned about the "grilles" on either end. At this time, given their age, they are EXTREMELY fragile. If a piece were to break off, it would get sucked into the impeller of the Supercharger. This would constitute a "foreign object", which would not only void your warranty, but cause damage to the impeller. Even the slightest impact could deform a vane, and cause an imbalance, which at best would result in a horrific noise, and at worst cause the bearing to fail or even the vane to make contact with the housing. None of these is desirable.



We recommend a new or rebuilt MAF be installed, but we understand that they are expensive and difficult to source.



Do NOT remove the grilles on the MAF. They are there to prevent foreign objects from getting into the MAF and buggering the wire, but more importantly they are also there to smooth the airflow and provide accurate readings at the wire. Without the grilles, the airflow is too uneven and can easily cause inaccurate readings. This will upset the air/fuel mixture. Common symptoms of this are rich starts, stalling after starting, uneven running on deceleration, excessive fuel consumption, stalling, and even lean condition under heavy load. The latter is of most concern, as this can also cause detonation.

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[Gotter]

Weekend project. Thanks!

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[ds968]

If anyone here knows of a source for new ( unlikely to be available according to my info ) or rebuilt MAFs , please post the info.

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[banditsc]

Porsche has them, that is where I got mine. RockAuto also has a couple reman options.

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[Chris Vais]

DS see my August 2011 post Mass Airflow Sensor Failure. I replaced mine with a used one from RS Barn at about half the going rate for a new one. There are other non-Porsche units that will work, See referenced post.

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[flash]

while i might be inclined to try something on a normally aspirated engine, given the specifics of the tuning, i would not stray from the correct part for a supercharger application.



also, a used part will likely be no better than the one you have now. it will be just as old, and just as fragile. it might fix a situation with a broken one, but it won't provide any more security against failure than another old one.

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[ryker]

Sunset Porsche has remans from Germany for $510.15 plus refundable core charge of $315.53. Do the remans have new plastic? What are they actually "remanufacturing"?

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[DaveN]

I have a feeling anything REMAN would have the original plastics. They will probably replace the hot wire and verify the functionality of the electrics and connectors under load.

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[banditsc]

I would assume they have new screens, they have to remove the screen to fix the guts, and as brittle as they are they are probably breaking them. RockAuto has the Bosch remans for cheaper then that if they still can get it.

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[DaveN]

Good point. I haven't actually looked at mine to see if they come off with ease of they would be destroyed to gain access to the wire.

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[ryker]

Wow, RockAuto is A LOT cheaper! $277 and core charge of $45. I'm bookmarking this site.

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[ds968]

Wouldn't any Porsche <acronym title='mass air flow'>MAF</acronym> ( 911, Boxster, Cayenne etc ) which has the same or almost the same diameter ends as ours ( just so the hoses fit ) function just a well as the 968 OE unit ? Some 911 and Boxster OE rebuilt ones seem to be available for under $ 100.

Then again, at $ 277 RockAuto price, no point bothering with retrofitting a non-968 <acronym title='mass air flow'>MAF</acronym> in there ..

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[flash]

no - the flow characteristics of the MAF are very critical. the slightest alteration in the flow through the unit results in a change in the readings. i went through this when i was tuning. as an example, i had to make some changes AFTER the MAF, as they were affecting what was going on through the MAF



while something else might work normally aspirated, in a supercharged application, the flow is extremely critical. air/fuel mixture is not something to screw around with, when getting it wrong can cause detonation.



think about it - even a dirty wire screws with the mixture. you can't usually see anything on the wire. what do you think an internal diametrical change, or a different grid pattern would do?

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[rxter]

Can we even get these things new? I've not seen anything other than remans out there.

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[Chris Vais]

When mine failed in 2011, there were only a couple new ones available in Germany, none in the US, at $700 a pop plus shipping. The remanufactured ones were not much less than the new ones. I opted for used one and have had no issues with it.

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[flash]

again though, it's a night and day risk factor between a supercharged engine and a normally aspirated one.

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[ryker]

So, I am very interested in this thread as I am super charging in two weeks. What to do...

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[jfrahm]

It's a common enough part other than the egg-crate. The sensor can be replaced or rebuilt by several outfits but the egg crate might be harder to source.



There is tech info about this <acronym title='mass air flow'>MAF</acronym> as Porsche also used it on the Audi RS2 and Audi owners have found that the <acronym title='mass air flow'>MAF</acronym> on the other 20V turbo cars from that era is the same other than slightly improved flow from the more open egg crate vs. the window screen on the other MAFs.



I have run a Volvo <acronym title='mass air flow'>MAF</acronym> that was fine, I did not find a dyno that might have revealed any reduced flow but the test suggests that difference is trivial.



Here is a great thread on the 968 / RS2 <acronym title='mass air flow'>MAF</acronym>:

http://forums.quattroworld.com/s4s6/msgs/20442.phtml



The Volvo part I ran without trouble: Bosch 0 280 213 012

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[flash]

i can tell you for certain that the screen messes things up, or at least really changes things. i was playing with that when i was trying to resolve something else on my own car. threw all of the maps to hell. i probably could have tuned around it, but it seemed like a lot more work at the time than i was willing to go through.

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[ds968]

What are the SC' s ( impeller ) RPM ?

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