Explain how timings used to change performance?

[salisbury1985]

Hi

Just curious and trying to understand whats done with the timing to adjust the performance/power when having a remap. Whats done with it and what does it actually change.

Thanks
Dan

 

[beachbuggy]

Hi

Just curious and trying to understand whats done with the timing to adjust the performance/power when having a remap. Whats done with it and what does it actually change.

Thanks
Dan

Timing on the me7 found in most Audi's is a little different to a standalone ECU. It works fundamentally off 2 series of timing maps. Timing revolves around a torque based map. If the engine wasn't limited by knock then it would run basically the figure put in the map, but it always is. So what happens is the ECU advances timing towards this figure and when knock or the onset is detected will reduce timing to combat knock. The other timing map is the one used to give an ignition value during this phase. Again due to the nature of the ECU and its protection systems adjusting timing in the maps can have huge effect for small changes. For instance. Say the ECU determines that the knock threshold at 18 degrees advance has been passed, it will then pull timing typically by 3 degrees until it senses the knock is gone and resume at 15 (18-3) By reducing the timing figure by 1degree you might find the threshold isn't met and 17degrees is held. So now by running 1 less degree you can in effect gain 2! And so on. It is more complicated than that as other routines , lambda, torque monitoring, Vvt , egt etc all play their part as well in the over all final timing value. Its a very safe method , and certainly not ideal for all out tunning!

 

[<tuffty/>]

Ignition timing - Wikipedia, the free encyclopedia

Timing advance essentially starts the combustion process as early as possible on the compression stroke to make best use of the energy released by the explosion of fuel/air mix...

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[Miguel_S#]

Good topic, more ignition advance more power