ecd15 boost control on vp pumps

[welshpug]

Wondering if there's anyone here that knows much about these ecu's, I have an M51D25, VP37 fuel pump, standard old school wastegate control directly from pressure signal on the cold side, no maf sensor on my fairly early variant.

I've done a bit of work recently on 1.9 tdi Audi's, also VP pumps, however these have a variable vane turbocharger and the ubiquitous N75 valve and a map sensor, also a MAF, and I love how quickly these things build boost.



Is there any way to get the BMW ecu to control the a vnt type turbocharger or am I necessitated to run a standalone controller?

there are some BMW turbochargers from the 3.0 engines that don't appear to be too difficult to make fit, being an early variant my turbocharger is a top mounted Mitsubishi TD04 11g, which is a mirror image of most TD04 type turbochargers.

[ConorTRG]

What model/year BMW is it?

[zx_volcane]

I would say you could fit a vnt with a boost actuator and mbc - and still feel the difference.

I think you would need to have the ecu mapped to provide more fuel in lower revs unless it only requires MAP input for IQ.

iirc a gt2256v from later model will bolt straight on

[Ruan]

I suspect your engine uses an MSA11 ECU - so probably not, very old school 8bit architecture. The later 325tds ECUs (MSA12 from memory) do have vacuum operated boost control, however, the maps are pretty coarse and small, I've never really looked at MSA11/12 in enough detail to know a huge amount.

Your best bet in reality is to swap to a later EDC15 based ECU - get one from the mid-age VP37 pumped 1.9TDis etc which are well documented in their operation and should control your pump fine. Unless your pump is a VERY early non-HDK quantity adjuster sensor in the pump, in which case you're pretty much stuck where you are unless you upgrade the pump hat to one with a HDK QA.

EDC15 ECU would require some work to run sweetly, but teach yourself if you've got some time and want to learn something new.

[welshpug]

yeah its quite old, when I had it chipped it was just that, cracked open the ecu and swapped the chip I wasn't 100% on which ecu it had, there isn't a lot of info on these.

its a late 93 525 tds, character of it is quite revvy for a diesel, and whilst its not slow I'm sure it would be better with a quicker turbo and more oomph low down.

[Ruan]

Sounds like it's a really early one - remember VW were using OTP "desolder the chips" ECUs up until ~1999!

Meh, either bang on a different ECU (lots of work) or put on a controller/boost can or whatever, will likely need the map updating a little, but should definitely improve things.