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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See also MS3 manuals. It would be a fundamentally different way of calculating fueling.

I do not believe that V1. Is anyone else using one of these sensors?

Bosch 1 928 403 836 – 5 way Female Compact Connector 1.1m for Bosch HFM5 Airflowsensor

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. The one I’m using was used in many VWs around – or so.

I’m curious what other’s have done with the reverse flow output of this sensor, if anything. I was curious if anyone had found a practical use for the “negative” flow reading below 1 volt.


Or in this case, in less gibberish terms, the Megasquirt will see 0 flow for all voltages of 1. I do not expect to need the negative flow output range volt. Thanks for the replies. Board index All times are UTC. I’m considering upgrading to the Bosch HFM5 sensor that does have reverse flow detection.

Air flow sensor | Autoscope | Autoscope Technology

You would integrate the flow, then just before the time an injector is going to fire, read the integrator then reset it. I think the HFM5 sensor and similar sensors can sense the reverse flow and take it into account and still produce a positive hosch reading as long as the positive flow is greater than the negative flow.

The way the MS firmware works if it sees an input value below the lowest entry in the table, it’ll just use the number corresponding to the lowest entry. I noticed that some Bosch data sheets show the negative flow reading and some just show the sensor output starting at 1 volt and don’t publish the volt data at all.


I can supply, repair or upgrade Megasquirts in UK. Google [Bot] and 3 guests. 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 boscy

Air Flow Sensor | Autoscope

This is a pretty old late 80’s – early 90’s MAF sensor that returns a V signal and has no reverse flow detection. I’m hoping the HFM5 will do a better job.

Users browsing this forum: It also outputs a V signal but the difference is that no flow produces 1V output. America needs more lerts.

Megasquirt Support Forum (MSEXTRA)

Return to MS3 General Support. The integrator value would then be used to calculate the amount of fuel to inject.

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