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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Users browsing this forum: 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. It would be a fundamentally different way of calculating fueling. Thanks for the information! I’m considering upgrading to the Bosch HFM5 sensor that does have reverse flow detection.
The one I’m using was used in many VWs around – or so. I do not believe that V1. It also outputs a V signal but the difference is that no flow produces 1V output. I’m hoping the HFM5 will do a better job.
Air flow sensor | Autoscope | Autoscope Technology
I’m curious what other’s have done with the reverse flow output of this sensor, if anything. Board index All times are UTC. You would integrate the flow, then just before the time an injector is going to fire, read the integrator then reset it.
Thanks for the replies. I can supply, repair or upgrade Megasquirts in UK. 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 nosch data at all.
I do not expect to need the negative flow output range volt. I think the HFM5 sensor and similar sensors can sense the reverse flow and take it into account and still produce a positive flow hfj5 as long as the positive flow is greater than the negative flow.
Air Mass Sensor 0281002447 Bosch Flow Meter 2816427000 Hfm5 Quality Replacement
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? 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. The integrator value would then be used to calculate the amount of fuel to inject. Google [Bot] and 3 guests. America needs more lerts.
yfm5 I was curious if anyone had found a practical use for the “negative” flow reading below 1 volt. This is a pretty old late 80’s – early 90’s MAF sensor that returns a V signal and has no reverse flow detection. Is anyone else using one of these sensors? Or in this case, in less gibberish terms, the Megasquirt will see 0 flow for all voltages of 1.
Return to MS3 General Support. I will see in a week or so when I install it on my engine.