NefMoto

Does anyone happen to have the proper MAF scaling values for the OEM RS4 Bosch MAF for an M-box?

***EDIT***

RS4 MLHFM values found here: http://nefariousmotorsports.com/forum/index.php?topic=1301.msg12105#msg12105

I opened up an RS4 bin using the M-box XDF and it looks like the MLHFM on both files are in the same place.  It looks like it contains usable data.  What do you think?:

Stock Bosch vs. RS4:

(http://img812.imageshack.us/img812/5122/mlhfm.jpg)

Mlofs is 200 also.

Just need the KFKHFM values.  They must be in a different place because the map comes up all crazy.

KFKHFM values are all 1 on the RS4.

Thank you Rick.

Just to be certain, you are referring to the RS4 MAF or the RS4 itself?  My car is an S4, with an RS4 MAF.  Not sure if there's even a difference but I want to make sure.

MLHFM corresponds to the RS4 MAF.
KFKHFM would correspond to the RS4 Airbox.

I think that was the point Rick was trying to make.

Are you running a Hitachi or Bosch sensor in the MAF housing.  This matters in subtle ways, depending on which you are using.

I am running the Bosch sensor in the RS4 housing. All oem RS4 components. RS4 Y pipe as well. All came with my APR stage 3.

I am running the RS4 upper air box and a stock S4 lower that has had the bottom cut off of it. Didn't want to cut up the RS4 one.

OK, well it sounds like it should be the map you found for MLHFM and all 1's for KFKHFM in addition to the MLOFS of 200 you have already.  That should be good enough to move forward to fuel tuning.

Would you please post an excel spreadsheet that has the S4 / RS4 MLHFM tables in them so we can all benefit from your explorations?

Thanks!

I've done many tunes with RS4 MAF.  It's the only one to use IMO.

Rick - Do you use the A-box Bosch sensor or the RS4 bosch sensor it comes with?  Does this even matter?

I use the complete RS4 housing and sensor, the sensor is different, you can't use the S4 Bosch sensor.

Rick

Not always. The hitachi MAF is more reliable, and getting it into a different housing isn't difficult.

The hitachi sensor is more reliable the the stock S4 Bosch sensor however the Bosch RS4 sensor is just as reliable as the hitachi (from what I understand). Used in Allroads, B6 and B7.

Attached!   ;D

Does anyone have a MAF scaling for the Hitatchi in the RS4 housing?

Thank you for posting this!

In this Excel max value for S4 sensor in MLHFM table is 1407,3 kg/h while S4wiki states 1213,1 kg/h. Which value is correct?

http://s4wiki.com/wiki/MAF

I am looking for a HFM5 sensor that can support 1400 kg/h in 73mm housing. Can it be done with S4 OEM sensor or I need RS4 sensor in 73mm housing?

EDIT: ok, I got it, it's probably the 200 offset that makes the difference. Has anybody tried running RS4 sensor in 73mm housing?

As RS4 sensor is making 1793kg/h in 83mm housing it should make app. 1392 kg/h in 73mm housing. Has anybody tried it? Is there a calibration table for that combo?

RS4 Sensor in an S4 housing is same size etc as R32 MAF (RS4 sensor is same as the R32 Sensor)

Unfortunately that is not so: R32 and S4 have the same sensor type which is HFM-5-8.5 while RS4 has HFM-5-9.7

You are looking at a different MAF then as the R32 MAF sensor that I pulled apart had the exact same part numbers as the B5 RS4.  There are different MAFs for a couple of different R32s, that's also why the MLHFM is slightly higher in the R32 than in the S4 even though the MAF IDs are exactly the same and they even have the same air straightener.

The R32 part number I'm talking about is 07D906461

Here is a link to ECS, where you can see it's the same as the RS4 not the S4 as you can see the Diode/resistor (can't remember which one) and the little step on the bottom of the MAF sensor.

http://www.ecstuning.com/Volkswagen-R32_MKIV--3.2/ES252201/ (http://www.ecstuning.com/Volkswagen-R32_MKIV--3.2/ES252201/)

I have tried RS6 MAFs, S4 MAFs, R32 MAFs, B5 RS4 MAFs and am now running A8 MAFs mainly for the flow straightener over the B5 RS4 units (this does slightly reduce the max airflow in MLHFM table)

That is the IAT sensor, the naturally aspirated vehicles run it from the MAF. Turbo vehicles need to know IAT post turbo, so it's in the intake.

Daz, Totally agree, but the B5 RS4 uses a MAF sensor with exactly that, with Part number F 00C 2G2 047.

And here is a link to VWVortex showing the R32 MAF sensor exactly the same part number F 00C 2G2 047.

Oh B5 S4s use Bosch MAF sensor F 00C 2G2 040.

http://forums.vwvortex.com/showthread.php?4844154 (http://forums.vwvortex.com/showthread.php?4844154)

I have 4 RS4 MAF's here, none have that.......

HOWEVER, the B6 S4 has it, and also has the same part number.

Wow interesting all the MAFs I have from ECS have it, with the same part number.

Oh well I guess the part number is more important and the diode/resistor is not as the B5 RS4 and RS6 (mine) would not use the IAT function anyway

Part numbers you have posted are part numbers of the sensors and those sensors are of type HFM-5-8.5, as can be checked with Bosch online catalog: http://www.bosch-automotive-catalog.com/public/catalog/products?p_p_id=BoschWSRP&p_p_lifecycle=1&p_p_state=normal&p_p_mode=view&p_p_col_id=column-1&p_p_col_count=1&_BoschWSRP_wsrp-urlType=blockingAction&_BoschWSRP_wsrp-navigationalState=%2FWFS%2FAAGLOBAL-AA-Catalog-Site%2Fhr_HR%2F-%2FEUR%2FViewSearchProduct-ByNumberTypesWithOrderNumber%3Bpgid%3DD41D8CD98F00B204E9800998ECF8hqulSsFU%3Bsid%3Dhk-NWgEQ9swa9lPSAKEaoA6bJ6zlsKDz7qU%3D&_BoschWSRP_proxyportlet-remoteInvocation=true

Enter "0 280 218 074" for R32 MAF and you will see it has HFM-5-8.5 sensor.

If you enter "0 280 218 067" for RS4 MAF you will see that it has HFM-5-9.7 sensor, which is a little confusing to me.  :-\

But anyway, if R32 MKIV sensor can support 1400 kg/h in MLHFM (effectively, when offset has been applied) in 73 mm diameter housing it would suit me perfectly.
So, does it? :)

Hate to disagree but that is not the IAT sensor. It is called auxiliary (or additional) temperature sensor and is binded to pin 1 of the HFM 5 sensors. If that sensor is missing pin 1 is not used.

Pls see screenshot from Bosch HFM5 catalog:

(http://i42.tinypic.com/f2iss3.jpg)

I don't think you're disagreeing, I think you said the same thing with different words.

Hello,

I am having some problem with RS4 MAF conversion from Hitachi in 551R me7.1
The problem is that it cannot measure anything more than 11g/s while on throttle.
IDLE shows stable ~5g/s

MLOFS set to 200
MLHFM copied from my previous conversion which worked fine..

edit: issue solved broken MAF out of the box

I think the point is, some ECUs dont use that as IAT input, they use a separate IAT sensor