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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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. Return to MS3 General Support. I can supply, repair bosfh upgrade Megasquirts in UK.
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Air Mass Sensor 0281002447 Bosch Flow Meter 2816427000 Hfm5 Quality Replacement
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. I do not believe that V1.
Or in this case, in less gibberish terms, the Megasquirt will see 0 flow for all voltages of 1. Is anyone else using one of these sensors?
Thanks for the replies. 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? Users browsing this forum: I’m considering upgrading to the Bosch HFM5 sensor that does have reverse flow detection.
It bozch outputs a V signal but the difference is that no flow produces 1V output.
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. Google [Bot] and 3 guests.
I do not expect to need the negative flow output hm5 volt. The integrator value would then be used to calculate the amount of fuel to inject.
Megasquirt Support Forum (MSEXTRA) • Bosch HFM5 MAF sensor with return flow detection (View topic)
I will see in a week or so when I install it on my engine. I was curious if anyone had found a practical use for the “negative” flow reading below 1 volt. I’m hoping the HFM5 will do a better job. Thanks for the information! You would integrate the flow, then just before the time an injector is going hfmm5 fire, read the integrator then reset it.
Bosch 1 928 403 836 – 5 way Female Compact Connector 1.1m for Bosch HFM5 Airflowsensor
This is a pretty old late 80’s – early 90’s MAF sensor that hfm a V signal and has no reverse flow detection. America needs more lerts. It would be a fundamentally different way of calculating fueling. See also MS3 manuals.
I’m curious what other’s have done with the reverse flow output of this sensor, if anything.
The one I’m using was used in many VWs around – or so. 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.