Bosch Motronic red label 402 DME(need help getting started!)

[Matich]

Hi everyone!

I have been searching around trying to find the proper XDF's and BIN's for my red label 402 DME, the only 402 files I found on the TunerPro downloads page are for a 402 silver label DME?

I'm know that the 403/405 is cross platform however the 402 is not. Could anyone please PM me the correct files to get started or should I swap the DME to another version? (it was out of a 92 325i however theres a possibility it could be swapped)

P.s Has anyone here tinkered with the non-vanos hotwire maf? People have suggested installing it in a larger diameter tube to shift the point in where it reads, although this gives rough idling down at low rpm, could this be something that a tune could fix or will the ecu always fight to correct values in these circumstances?

[Matich]

Recently found out that a m51 e36 325 tds maf is a 6pin hotwire maf also, I wonder if it could be rewired to run on an m50b25?

[Evil]

With good knowledge of how tables and headers works in motronic, you can easily found all you need from all the infos here on 403 and 413 😉
Why do you want a bigger maf? It can be useful for turbo or supercharger applications, but in naturally aspirated, maf is not a limiting factor with original cams and throttle body

[Matich]

I'm only starting so my knowledge about these DME's is very very limited, that being said I thought the best place to start would be with the correct files

I want to find a work around for the MAF as the car is being turbo'd and many threads I have read about the old hot-wire MAF on the non-vanos engines reaches it's limit very early (5psi), Although still tune able, I would be silly to even attempt blind tuning hahah

I would like to try keep the stock management if possible, my last resort will ultimately be full standalone.

[Evil]

The bin and XDF you can find in the download section will work with your 402 I think. For my 403 there is 2 different soft numbers and they worked both on mine. There can be some minor differences but anyway both are OK to start with (I think there is one version for 3-Series and another for 5-Series).

You can also find some more stuff very quickly by searching on this forum.

For a bigger MAF you can look at M3 ones or V8, and copy the MAF transfer function on the corresponding bin. This is the simplest solution IMO for low boost application.

[Matich]

Do you recommend keeping the same MAF and editing the transfer function? or is this with a new hotwire maf and using the M3/v8 transfer function?

I have found a pdf here on the 402 dme which is awesome so been reading through!

P.S How do I find out the software number of my DME?

[Evil]

Bigger maf with corresponding transfer fonction.

Soft number ls written on the chip I think. You can also find this number in the end of your Bin, using the ASCII column of the hex editor