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Title: R32 Turbo ME 7.1.1 C167 MAF voltage issue Post by: Pendrak on January 20, 2025, 01:17:13 AM Hello,
Im working on a R32T setup and I ran into some issue with MAF voltage. At 0.8b, the signal from the original R32 MAF/housing stopped at 5V - the end of MAF sensor resolution. Not wanting to change the MAF housing, I decided to put the MAF sensor from the RS4 B5, so I switched from HFM-5-8.5 to HFM-5-9.7 as the sensor from the RS4 B5 have different characteristics and can measure higher flow rates in the same housing. After properly scaling the MLHFM, I find that on the same boost I hit the ceiling at 4.62V and signal get's flat. Anyone have any idea why this is the case? Doesn't the sensor from the RS4 B5 have a measurement range of 0-5V? Thanks Title: Re: R32 Turbo ME 7.1.1 C167 MAF voltage issue Post by: prj on January 20, 2025, 06:30:26 AM It's not flat, that's the airflow you're making.
And in the future post logs, not images. You're so hyper focused on this graph and so sure you are right, that you don't even give the others the data to look at. Title: Re: R32 Turbo ME 7.1.1 C167 MAF voltage issue Post by: Pendrak on April 02, 2025, 01:06:40 AM Hey, prj thanks for your reply. Forgot to attatch the log. I think there is still a problem, as soon as uhfm_w get's flat lambda correction runs away on + 16-17% and ESP light start's flashing. I have checked all diagnostic functions and mldmx_w is 833g/s through the whole rpm range so it shouldn't trigger anything. Any one has an idea where should I start to dig?
Title: Re: R32 Turbo ME 7.1.1 C167 MAF voltage issue Post by: fknbrkn on April 02, 2025, 07:07:31 AM esp light comes from esp / miasrs request torque intervention
you might want to check DPUPVDK to fix pspvdk as for the maf value id say its hw issue due to maf voltage uhfm_w comes directly from sensor without any calibration Title: Re: R32 Turbo ME 7.1.1 C167 MAF voltage issue Post by: BlackT on April 03, 2025, 03:48:15 AM Looks like mehanical issue, some flow restriction
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