VEMS in a 2002 Audi S8: canbus + OBD2 compatibility

[smurfinator]

Thinking of building an S8 into something more excessive (6speed, twin turbo with mutilfuel and lean burn for long cruises) and wondering if I can piggyback a VEMS for engine management and not mess up most of the OEM wiring and features, such as dash gauges, OBD2 etc.

Anybody got experience with this?

[MWfire]

Yes, you can make that. Only problem is warning light(you need to connect to vems).
Also you need to share primary trigger sensor(vr). I usually use 100nF and 22kohm in series on both wires(+ and gnd).

[smurfinator]

Roight.  Thanks for that.  I'm now thinking about a 2.5 07k instead of the V8.  I think I can get the weight of a short wheelbase D2 down to 1700kg.