what do you think of this? Has anyone used it?

[NC944er]

I tested the Storch MAF on two 8-valve 944s in the video referenced above. In short: the kit worked well on both cars and installation was a breeze. At dyno testing, they were running a little lean for my tastes, but adding +6% fuel using the FQS switch on the DME computer provided better results.

You won’t realize any wild performance gains with either the Storch or the Lindsey kit in my experience. The benefit of Storch comes with the early cars, where Lindsey requires a newer DME computer to accommodate the EEPROM chip and Storch does not, so it ends up being a lot cheaper than Lindsey in those cases. That, and the 16-valve cars, for which there is no other option at the moment.

If your existing factory AFM is failing, the cost of the MAF makes more sense, as you’d be spending a similar amount to replace the AFM anyway, while adding some reliability by eliminating the mechanical flapper door setup in lieu of a modern sensor solution.

[Latitude48]

This company sells a MAF kit for the 944 S2 though. Lindsey doesn't. Are there any other S2 MAF kits?

I have the Storch S2 MAF for my 1990 S2, but haven't installed it yet as I've been waiting for the weather to warm-up as I also need to pull the instrument cluster to fix the broken odometer gear. We had a short stretch of nice weather recently but unfortunately "yard work" took priority (ugh), and now it's back into the low 50s and rain.

The S2 kit looks very nice and should be easy to install. I'm not aware of any other MAF kits for the S2.

[BennSport]

Correct me if I’m wrong, but wouldn’t a modern MAF improve performance in high altitude situations as it measures air density?

[Latitude48]

Correct me if I’m wrong, but wouldn’t a modern MAF improve performance in high altitude situations as it measures air density?

It might. When you install the Storch MAF they say to disconnect the factory sensor, which I think is just an on/off switch at some barometric altitude.

[NC944er]

The factory AFM unit measures intake air flow and air temperature. It was paired with a separate altitude sensor/switch that activates at 5,000 feet above sea level, changing the DME to a high-altitude fuel map, which only estimates density changes under that specific condition.

As for the MAF setup, because the physics of the hot wire sensor automatically account for changes in density on a continuous basis (such as variations in temperature and altitude), it will provide more precise measurements at all elevations.

If you only plan to drive your car at lower elevations, the altitude sensor will have no effect and can remain connected, but certainly disconnect it if you live/operate at 5,000 feet or above, as it will lean out the air-fuel mixture.

[Tom]

The 944 Turbo DME "Test Plan" says the altitude sensor triggers at 1000 meters (~3,281 feet) and I believe the N/A uses the same part (944 606 051 00).

(I see 5,000 feet listed a lot -including chatbots- so suspect that is one of those internet things that gets echo'd around, unless there's something I'm missing?)

[BennSport]

The factory AFM unit measures intake air flow and air temperature. It was paired with a separate altitude sensor/switch that activates at 5,000 feet above sea level, changing the DME to a high-altitude fuel map, which only estimates density changes under that specific condition.

As for the MAF setup, because the physics of the hot wire sensor automatically account for changes in density on a continuous basis (such as variations in temperature and altitude), it will provide more precise measurements at all elevations.

If you only plan to drive your car at lower elevations, the altitude sensor will have no effect and can remain connected, but certainly disconnect it if you live/operate at 5,000 feet or above, as it will lean out the air-fuel mixture.

Well as someone who lives 4500 feet above sea level, would it be a good idea to disconnect mine?

[Sansho]

Although I didn't go look at the DME, the parts diagram would suggest it's an easy disconnect (part #20):

[Tom]

The factory AFM unit measures intake air flow and air temperature. It was paired with a separate altitude sensor/switch that activates at 5,000 feet above sea level, changing the DME to a high-altitude fuel map, which only estimates density changes under that specific condition.

As for the MAF setup, because the physics of the hot wire sensor automatically account for changes in density on a continuous basis (such as variations in temperature and altitude), it will provide more precise measurements at all elevations.

If you only plan to drive your car at lower elevations, the altitude sensor will have no effect and can remain connected, but certainly disconnect it if you live/operate at 5,000 feet or above, as it will lean out the air-fuel mixture.

Well as someone who lives 4500 feet above sea level, would it be a good idea to disconnect mine?

Curious, does that MAF come with chips? @johnb can confirm hopefully, but I'm fairly sure the altitude correction switch acts as a global modifier on fuel -- like the FQS -- and since the MAF is already accounting for the lower air density at 4500, you would not want to reduce fuel further with that switch. In other words, yes, I'd disconnect. It's up high and to the right behind the glove box, and has a simple connector you can just pull apart to disconnect.

[BennSport]

Hmmm, I might just have to bite the bullet and get that MAF and pull the sensor then. I notice a significant decrease in performance when I take my car up the windy mountain roads.