The thought is crossing my mind to ditch the motronic altogether in the 3.8 and fit something like MBE stand alone management.
The idea has been playing on my mind due to the experiences I am having with E30's.
Over the last year I have, with Bexley Motor Works converted quite a few customers' cars from running Air Flow Meter to MAF on various 2.7 and 2.5 E30's. The difference this makes is quite considerable over the nasty AFM.
Then we got hold of an Alpina C2 2.7 - quite a quick torquey machine to start with.
Owner decided to go a step further and went for MBE Stand Alone Management.
Now I thought the MAF conversion was good until I got to use this car over the last few months on a daily basis.
Bexley's took alot of care over the mapping and made sure it was extremely smooth, did good fuel economy and passed the MOT as far as emissions are concerned.
The car runs no MAF or AFM anymore. Everything is done on throttle position with a Barometric sensor and obvioulsy the crank sensor is also used.
The difference this made is simply phenominal. The throttle response is just brilliant, the driveability is so much better than before. Everything is so instant.
Getting back into the M5 - just feels so slow to respond, exactly like an M20 engine with a MAF on it (but much better than one equiped with an AFM).
MBE and many other good stand alone management systems can also have Lambda as an input and run ignition coils.
I think with a setup like this and skillfull mapping the S38 3.8 can really come alive just like the much more basic M20 engine has proven to do so.
The S38 being a much more advanced and power engine, I think the difference will be even bigger.
Has anyone ever tried this?
Also, does anyone know the resolution on the 3.8 ECU?