Megasquirt talk (split from robokills project thread)

[JMR_AW11]

I've just looked at the MS2 webpage and sure, you can now have ignition timing control.

But is is far cruder than the 20 year old stock ECU.
it's only got 12 mapping points as opposed to 17 on the main ignition map for the stock ECU.

Also the stock ECU has a seperate ignition map for idle/overrun.

MS2 has at least got a coolant ignition correction map. The stock ECU has two.
(one is for overtemperature correction at certain MAP sensor settings)

On top of this there is an ignition timing correction when the TVIS activates on the stock ECU (there is even a delay routine to allow the TVIS to open)

Also, the stock ECU has a clever idle stability routine. When the idle falters, the stock ECU can sense this and it can kick in extra timing advance to bring the idle rpm back up quickly to prevent a stall. There are maps for the attack and decay charateristics of this function and also for how much advance it can add.

If you went for a Unichip you would lose none of these features.