Thread: Remapping EU2 motors - a word of warning

The tuner emailed through a EU2 .map file for the D2 last night, which proves they are capable of doing so if needed. I would point out that firm in question has an excellent reputation, and my concern has alway been that an EU3 .map had been supplied for an earlier EU2 motor. The fact they can supply an EU2 map if the customer demands eliminates my concerns about the products they supply for the EU2 engined D2.

But of course, despite all the occult preparations and sacrifices to the gods of ECU flashing, the Nanocom froze in the final 10% of the upload and the ECU is bricked again.

cheers
Paul

Hi,

Hopefully I can give you guys some of my experience regarding this subject, although almost everything was said.

Again, sorry for not writing absolute correct language but, as some of you know, English is not my mother language.

Main differences between Eu2 and Eu3 are the throttle settings, the injector pressure and of course the AAP sensor.

An NNN ECU and EU3 map has more accurate settings and readings than old msb units and eu2 maps. That´s why you will always achieve more performance with EU3. Trying to make an EU2 engine “look and behave” like an EU3 (if we can put it this way) is always a difficult task that needs constant adjustments till it´s perfect, specially when you are using nanocom – with rovacom is a bit easyer, because it allow us to match the software variant with fuel tune id.Of course, in this process some “ghost” errors can pop up in the ECU, and they should be looked with attention and of course see which ones are a reason to worry about.

Regarding the AAP sensor offtrack had the subject very well covered.

Using an NNN ECU EU3 in a post 2002 car with a 3 wire AAP sensor will give you non accurate atmospheric pressure readings. The ECU will have inputs 10/15% above real. For example: if we are in a place with 950mba the ECU will have inputs of around 1070mba. 10% to 15% seems to be a small difference, but in fact this is the difference of the car being in a place 600 m above sea-level or in a place at 1000m... big difference!

3 Wires:



4 wires:




What happens is that the oxygen concentration at 600m above the sea-level is a lot different from the oxygen concentration at 1000m. So, the ECU will tell the engine to inject more diesel in order to make a good combustion. This will make the engine to work with more fuel then needed, specially when your car is at higher places.

Just a quick note to say that readings with the nanocom are in kpa/cm2 so you will have to x10 that number to have mbar readings.

Differences between AAP sensor pre and post 2002:
- In both cases they receive the 5v signal from the pin8 of the ECU conector – Pink/purple cable
- In both cases they receive power from the signal - Pin 30 of the ecu – Pink/black cable
- In both cases the outsignal for the AAP sensor is a White/yellow cable wich goes to de pin 10 of the ECU
The main difference is the Green/Blue cable - pin 31 of the ECU – This output signal gives information regarding air temperature and egt. So, with a 4 wire AAP sensor, the ECU receives to different signals from the sensor. These are data for the discovery. Defender is a bit difference in some parts, most regarding to some cable derivation to the IAT I believe.

Additional Information:
The 4 wire AAP sensor is LR P/N MHK100820 and is the same sensor form the new mini, so any BMW dealership can source you that at half the price - part number 0872648
If needed, there are connectors available here:
Simtek (UK) - For All Your Automotive Connectors=

Hope this info is useful.

Regards,
José

Hi José

Thanks for posting this information. It really helps understanding the finer points between the EU2 and EU3 remaps.

So it seems that if you want to simply replace the MSB ECU on a EU2 motor with minimal fuss, you need to run a EU2 map.

On the other hand if you want the best optimised map you need to look to a EU3 base map plus AAP upgraded to 4-wire and throttle pedal to a 3-way version.

cheers
Paul

I read all this with absolute fascination, even though most of it was over my head. Thankyou to all you learned people - I am in awe. Just a couple of little questions, what ECU, EU, AAP and throttle pedal versions does an MY04 TD5 manual have? Where can I read more of what and how the ECU works to manage the performance of the engine?

My heads spinning, I really need to read up on this, but then again, at my age, perhaps I should have bought a series 111, Bob

Originally Posted by Mundy

I read all this with absolute fascination, even though most of it was over my head. Thankyou to all you learned people - I am in awe. Just a couple of little questions, what ECU, EU, AAP and throttle pedal versions does an MY04 TD5 manual have? Where can I read more of what and how the ECU works to manage the performance of the engine?

EU3 NNN500020 or NNN500120

4 wire AAP

3 wire pedal

Originally Posted by Mundy

I read all this with absolute fascination, even though most of it was over my head. Thankyou to all you learned people - I am in awe. Just a couple of little questions, what ECU, EU, AAP and throttle pedal versions does an MY04 TD5 manual have? Where can I read more of what and how the ECU works to manage the performance of the engine?

Like tombie says.

Unfortunately there isn't really any info on the inner workings of the Td5 ECU's beyond what is in the RAVE Td5 engine management section.

As a small update I've been running the EU2 remap for the past few days, and even as a starting point it's impressively well balanced and smooths out a fair bit of the vibrations I was getting before up changes. I like far more than the DPL chip for every day driving.


Cheers
Paul

What amazes me is the fact the tuners know an EU3 map won't work on early D2s when you stick an NNN ECU in with an upgraded EU3 file.

When we finally got ours sorted, the tuner sent us a new file that was EU2 based, suddenly the car drove better, the smoke was reduced and all the ghost faults disappeared.

One thing we also found out in all this, DON'T go for the biggest file(most power) you can, they don't work on the early EU2 files, regardless of what they say.

Our ECU was a NNN500020 ECU that replaced our old MSB ECU, this is now in another forum members car and he (and his wife) are very pleased with the power it gives them over the BD chipped ECU.


I reckon this is probably some of the best info on tuning ECUs I've read on this forum and I'd like the thank Offtrack for posting it

I only wish he did it 3yrs ago

Baz.