Originally posted by ForcedFirebird
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I dont really understand why your saying alpha-n doesnt have enough info for the engine or is hard to tune? The only thing it cant do is compensate for atmospheric pressure or altitude but most stand alone ecu's have a function for exactly that. But at the end of the daty the difference it makes is SO small its hardly worth turning on unless you plan on going to relly high altitudes, and could be quite easily enabled to get pretty close with a couple test drives and AFR meter etc.
Your factory one..... of course i can understand its not going to work well because your primary load sensing device is still sitting on you workbench! :nice: which is testament to the motronic that it even runs well enough to drive at all!!.... on what is maybe a limp home mode???
An aftermarket ecu on the other hand can be well tuned using Alpha-n very easily, my tuner loves them! because he can access the whole map and simply run up all the load bands on the throttle pedal with perfect stability and no jumping around. Temp, ASE and other compensations need to be set up but no different to speed density etc. Maybe on an inertia dyno it might be a PITA but I havnt heard of anyone who uses one down here.
I can down load my datalog and my AFR's pretty much draw a straight line from one end to the other. I know its a race car but i drove an alpha-n tuned road car for years too, again cold hot winter summer never worried it. I never used atmo comp or closed loop, which would certainly take care of any little inconsistencies if you were really worried.
Edit: .. Actually Digger you car is a daily driver and has been Alpha-n for a while now, line any tune it always takes a bit of refining, but how has it been to drive around?... compared to speed/ density?
and its an ECU thats not all that good at holding a tune particularly stable i found.
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