RomRaider

Hi @Tjwasiak,

Are you able to share here the M62TU linearisation?

I admit my MAF (and thereby load) scaling/reading is way too low. However, how could it be? Pazi88 doesn't share any wrong MAF scaling I guess?

M62TU MAF linearisation taken from EU E53 M62TUB ME 7.2 ECU running newest SW version with 200kg/h offset already applied

Resistor calculation fixed in first post.

Just bought an RS4 Bosch 0280218067. Will be interesting to see what it takes to get this working.

This thread is incredibly valuable, I am surprised to see that it is getting buried. Can it be made into a sticky?

Can please anyone help me out with the correct pinout for the BMW M62TU MAF (Bosch nr: 0 280 217 814).

My issue is that I am seeing way to lean mixtures after upgraded MAF (before AFR was spot on). I understand fine tuning is needed, but I think my pinout is wrong somehow. Using as follows now:

MAF PIN1 = [-] (Not connected)
MAF PIN2 = +12V
MAF PIN3 = Ground
MAF PIN4 = +5V
MAF PIN5 = Signal wire

Using a 4.9kOhm resistor between MS41 MAF harness black wire and chassis ground.

However, measuring now again (after not working on it for various months) I see 0.62Volt in RR Logger with ignition ON and 1.15 Volt between MAF PIN5 and chassis ground.

Can please anyone help me out. I don't know what I am doing wrong...

I don't use any resistor in my case because voltage is low enough. so don't take other case for granted. goal is not what you measure but what is the voltage reported in RR.

but you said you got it running perfectly anyway?

Your best bet is going to be searching for people who've tuned M62TU engines with stock MAF. You will probably find people who've done FI on those engines and have messed with the wiring on the stock setup. If you search for that then you will probably find some posts or other anecdotal information that will also explain what those pins do for your setup. It may not be on this forum, maybe if you search on bimmerforums, or just use google.

Also, try the website "wedophones.com" -- they have a bunch of electrical manuals for BMW's between ~1985-2006, yours might be in there but I am not sure. I've used the manuals a bunch to figure out wire pinouts and stuff; they're not as explicit as an engineer would always prefer, but they are often good enough to deduce things.

Hello boys,

need your help here

attached is my partial and my log showing that if i press throttle pedal quickly it is showing max load of 1389and , i read in all those of your posts that we should not go near to that value. but i do not know what is making the ecu or romraider logger see that big value.

please give me you advises on what to check for in the maps?
By the way I am using nissan Maf sensor and the maf scaling is worked for my setup.
Otherwise car runs well but i dont like to see this load limit , and mostly want to know what causes it so i can work on it .

Patrik

when coasting off throttle, there is vacuum in your intake manifold.
then you stab the throttle open and that vacuum pulls a certain amount of air in a very short period of time, leading to a spike in the engine load reported by the maf.

I would not be too worried getting at those values during fast throttle opening.
It is problematic on forced induction engine when you are running at those values "permanently" when on boost

Thank you for replying dx4picco

But this never did happen with oem siemens MAF sensor.

But if you think is not a problem then I think I`m ok .

No I do not get that load during wot or boost.

I got the same effect using a regular Siemens maf. No problem at work

Hello, I installed a Nissan 22680-7S000 in my car, first of all, you need to know and be aware that there are a LOT of fake Nissan MAF sensors online, mostly on ebay, even on stores that they say it is a genuine sensor and shipped from USA (Most of them are shipping from USA but China sellers). I already created a topic about this, where I show you the differences I found between a genuine OEM sensor and a FAKE one. You will find them listed as new genuine nissan sensors but with prices lower than 30 USD.

Then, after I realized my MAF was a knockoff I got one used but working from a friend that was genuine. Then I used the transfer curve found on this thread. It worked, I scaled it to my tube ID, but I got very low load and MAF readings at iddle. I procceded to tune fuel and ignition, and I got it working but with my idle a bit unstable, and very rough on cold starts. Then I realized that the readings from the low side of the curve are edited, I guess to fit another MAF sensor that had different readings. So I procceded to get my hands on a BIN file from a NISSAN 350Z from 2006, then I got the transfer curve from there and converted it to KG/H. As I thought the curve found in the spreadsheet in this topic is edited at the lower side.

After I changed my transfer curve to the one found at the 350Z file, everything went back to normal, smooth idle, and my readings at idle were the ones I was getting with my OEM BMW MAF. So, for those who had problems with this transfer curve, I share here with you the one I got personally from the 350Z BIN file and is working wonders for me. It is a spreadsheet where you can find the original 64 point curve, then converted to 256, and the table to paste it to RomRaider if you are using the stock 2.76" tube.

Hi
where i live its really hard to find an m52b25/28 maf,
is it possible to use an m52tub25/28 maf in place of it
without touching any tune maps
is using use the m52tub maf scaling will be adequet?

That is exactly how i built the original scalar but everyone complained about it...