Spoofing the Motronic 1.3 (aka basic engine theory)

[Bill R.]

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[Jeff N.]

The other stuff I pretty much have figured out...curious the source of all this.

Thx Bill!

Jeff

[BillionPa]

bosch manual?

[zygoteer]

... Richer mixture needs more time to ignite thus the added advance.

True, the speed of the flame front (explosion) is slower.

... if the air temperature rises ... you reduce the advance to mitigate the chance of ping/knock with a lean mixture.

Yes, this is logical action that most ECU's take, but obviously in varying magnitude.

... I can counter the rich mixture by adjusting my MAF signal.

This will work, but only partially - not the complete answer.

[Jeff N.]

Concur that spoofing a cold run to get advance and then cutting back the airflow signal is a less than desireable hack.

Again, curcur adjustments are ECU dependent. Have any details on how the motronic adjusts?

True, the speed of the flame front (explosion) is slower.



Yes, this is logical action that most ECU's take, but obviously in varying magnitude.



This will work, but only partially - not the complete answer.