Bosch HFM 5 Views. 3 years ago. No tags were found READ. Bosch HFM 5 READ. Show more . Robert Bosch GmbH. Automotive Aftermarket. Postfach Karlsruhe . Germany Hot-film air mass meter, type HFM 5. Bosch: – 5 way Female Compact Connector m for Bosch HFM5 Airflowsensor.

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Is anyone else using one of these sensors? You would integrate the flow, then just before the time an injector is going to fire, hf5 the integrator then reset it. See also MS3 manuals. As far as I know the MS3 firmware doesn’t support negative flow values, I’m not even sure what one would do with that info?

It would be a fundamentally different way of calculating fueling. The HFM2 is open to both forward and reverse flow equally whereas the HFM5 is open only to forward flow and the data sheet claims that it accounts for reverse flow. I noticed that some Bosch data sheets show the negative flow reading and some just show the sensor output starting at boscg volt and don’t publish the volt data at all.


Bosch Automotive Catalog

I will see in a week or so when I install it on my engine. Thanks for the replies.

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bpsch The one I’m using was used in many VWs around – or so. I think the HFM5 sensor and similar sensors can sense the reverse flow and take it into account and still produce a positive flow reading as long as the positive flow is greater than the negative flow.

Users browsing this forum: I’m hoping the HFM5 will do a better job.

Air flow sensor | Autoscope | Autoscope Technology

It also outputs a V signal but the difference is that no flow produces 1V output. This is a pretty old late 80’s hf,5 early 90’s MAF sensor that returns a V signal and bsoch no reverse flow detection. I do not expect to need the negative flow output range volt. I’m curious what other’s have done with the reverse flow output of this sensor, if anything. The integrator value would then be used to calculate the amount of fuel to inject.


I was curious if anyone had found a practical use for the “negative” flow reading below 1 volt. I do not believe that V1.

Thanks for the information! I’m considering upgrading to the Bosch HFM5 sensor that does have reverse flow detection. I can supply, repair or upgrade Megasquirts in UK.

Megasquirt Support Forum (MSEXTRA) • Bosch HFM5 MAF sensor with return flow detection (View topic)

Board index All times are UTC. Return to MS3 General Support. The way the MS firmware works if it sees an input value below the lowest entry in the table, it’ll nfm5 use the number corresponding to the lowest entry. Or in this case, in less gibberish terms, the Megasquirt will see 0 flow for all voltages of 1.