35i MAF or MAP sensor

mcbutler · Post by **mcbutler** » Fri Apr 02, 2021 8:29 am

which one does the N54 have - MAP or MAF sensor??

Ole gits rule · Post by **Ole gits rule** » Fri Apr 02, 2021 9:05 am

Not an expert on the Z4 but my last car had both, mass air flow and mass absolute pressure, do different things in the system

The MAP sensor requests more fuel as you drive, while the MAF controls the air entering the system in very basic terms.

Smartbear · Post by **Smartbear** » Fri Apr 02, 2021 9:26 am

Ole gits rule wrote: ↑Fri Apr 02, 2021 9:05 am Not an expert on the Z4 but my last car had both, mass air flow and mass absolute pressure, do different things in the system

The MAP sensor requests more fuel as you drive, while the MAF controls the air entering the system in very basic terms.

Maf measures the amount of air so the ecu can adjust the fuelling accuracy, the map sensor measures boost pressure to also monitor the fuelling requirements

Rob

R.E92 · Post by **R.E92** » Fri Apr 02, 2021 9:30 am

No maf, it has 2 pressure sensors, one on the chargepipe and one on manifold. The manufold one mainy measures vacuum and maxes out at 10psig, the chargepipe one maxes out at 21.5psig

Ole gits rule · Post by **Ole gits rule** » Fri Apr 02, 2021 9:42 am

Smartbear wrote: ↑Fri Apr 02, 2021 9:26 am
Ole gits rule wrote: ↑Fri Apr 02, 2021 9:05 am Not an expert on the Z4 but my last car had both, mass air flow and mass absolute pressure, do different things in the system

The MAP sensor requests more fuel as you drive, while the MAF controls the air entering the system in very basic terms.
Maf measures the amount of air so the ecu can adjust the fuelling accuracy, the map sensor measures boost pressure to also monitor the fuelling requirements
Rob

Knew it was something like that - not my strong point all these sensor - give me a hammer to free a starter motor and I am fine

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