Nyet - Since this is about re-engineering I thought this might be the appropriate area to post these questions. If not please move.

I know some folks sell tunes for NA engines such as the VR6 that has been converted to a turbo setup. It's unclear from my discussions with the car owners and the tune sellers how well these aftermarket tunes actually perform. Some folks are willing to tolerate a lot of poor running for the increased power.  

I'd like to know the following if anyone can answer these questions:

1. Has anyone here been able to reprogram an OE ME 7.1.1 ECU from an NA engine to run properly thru the entire RPM range on a cold to hot engine that has been converted to a turbo engine? My application includes a DSG trans and AWD.

2. Has anyone been able to reprogram a ME 7.1.1 to work together with an aftermarket EFI/Ignition ECU so as to retain all of the OE functionality of the ME 7.1.1 while using the aftermarket system to run the EFI/Ign. of a converted NA to turbo engine? If so what aftermarket system did you use and on what application?

TIA

It's very much doable, but it needs custom tuning.
Most stuff that is sold is pretty bad.

BTDT, working perfectly.

I converted two different ECUs from NA to turbo, including fully featured electronic boost control implemented on these very ECUs using free pins for the solenoid. The first one was a flawless job (still runs since 2009, EBC was added in 2013), the other one I cannot state anything with full confidence, I did not get to finish the fine tuning and the problems I was experiencing till I had to dump the project were not the most trivial ones (though by now I am quite certain I know what they were).

But, these were much simpler things than ME-s, though the second one was also ST10 based, it did not have torque structure or anything similar (and the code base size of about 30-50% of that of ME). I would attempt having a shot at ME with this, but somebody would have to pay me insane amounts of money and do some magic so that I'd have time for it.

For a half decent external solution look up DET from ECU master, but I am totally unsure how well it does things for more complex setups.

As said, it can be done , but the real reason you would do this is costs or just madness. as you know I probably have the only 1.8 turbo converted me7.5 running on stock ecu in europe, and so I can help with a few things if you decide to go that way.

But as I said before, many things differ in atmo softs, such as 120% torque structure like automatics trans, bts fueling switched off, different charge control , changeover etc.

You mentioned a few times you have me7.1 but what kind of car and engine? Audi , vr5, A6, 2.4 v6, 2.8 ?  

Also n156 runs off n75 power stage, you can kinda use it for boost manipulation if you arent going mbc or internal wg only.

DET is a very good piece of hardware for the money, it can also run semi standalone mode( running injectors separate from ecu signals), but for similar money you can get some decent standalone ecu's too.

Because you're going to end up defeating just about everything that is interesting in Motronic to 1) not have it throw codes 2) not drive like shit in part-throttle and only drive a little like shit in part-throttle etc.

At which point you may as well go standalone.

But yes, a lot of tuners take this approach, even for tuning non-NA cars for bigger turbos etc.

Thanks for all the info. folks. I knew this was not going to be easy or maybe not practical when it's all said and done. I am not totally opposed to an aftermarket ECU system but I would not give up some of the Motronic controls to use a less sophisticated ECU. It's unfortunate that the ME 7 series can't be easily converted to simply MAF without the torque based strategy.

For those interested the application is a 2008 VW R32 with the 3.2L VR6 engine, DSG and AWD. Not sure if supercharging is viable but if it offered a practical 7.1.1 ECU tuning path it might be an acceptable option. Will need to investigate that possibility before I start trying to hack the Motronic in any serious fashion.

That would probably be the ideal way to go.