Author Topic: Delaying ignition during starting to prevent kickback  (Read 111 times)

Offline RogueEngineer

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Delaying ignition during starting to prevent kickback
« on: March 12, 2021, 08:30:52 pm »
Running VEMS on an '85 911 that's been converted to twin plugs & wasted spark coil backs.

Max cranking RPM is about 250 RPM according to the sensors.  During the engine speed ramp up when I hit the started I get significant starter kickback - typically 3-4 times before the engine 'breaks through' and starts up.  Currently running 0 crank spark advance.

I would like to figure out a way to disable/delay ignition for a few cycles so the engine builds enough speed to trigger reliably.  One thought is to drop the flood clear TPS value low, and start with my foot on the gas, briefly, until I hit max starting speed, and then 're-engaging' the fuel system.

Any other clever ideas?

-Ian