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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I can supply, repair or upgrade Megasquirts in UK. Board index All times are UTC.

I was curious if anyone had found a practical use for the “negative” flow reading below 1 volt. Users browsing this forum: 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?

I’m hoping the HFM5 will do a better job. It would be a fundamentally different way of calculating fueling. I do not believe that V1. See also MS3 manuals.

I do not expect to need the negative flow output range volt. 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. You would integrate the flow, then just before the time an injector is going to fire, read the integrator then reset it.


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America needs more lerts. This is a pretty old late 80’s – early 90’s MAF sensor that returns a V signal and has no reverse flow detection. 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.


Thanks for the information! Or in this case, in less gibberish terms, the Megasquirt will see 0 flow for all voltages of 1. It also outputs a V signal but the difference is that no flow produces 1V output.

Is anyone else using one of these sensors?

I will see in a week or so when I install it on my engine. I noticed that some Bosch data sheets show the negative flow reading and some just show the sensor output starting at 1 volt and gfm5 publish the volt data at all.

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The integrator value would then be used to calculate the amount of fuel to inject. The one I’m using was used in many VWs around – or so. Thanks for the bsoch. Google [Bot] and 3 guests. I think the HFM5 sensor and similar sensors can sense the reverse flow and take it into account and still hdm5 a positive flow reading as long as the positive flow is greater than the negative flow.


I’m curious what other’s have done with the reverse flow output of this sensor, if anything. Return to Bossch General Support. I’m considering upgrading to the Bosch HFM5 sensor that does have reverse flow detection.