Use sodium filled exhaust valves, ceramic coat as much as you can and make sure your system suspends anti-lag when the coolant begins to boil. Base Timing is a manual timing adjustment. Very high temperatures are a byproduct of this type of anti-lag implementation I'm afraid. Ignition timing (or spark timing) controls when the spark plug fires during the Compression Stroke. The total timing is limited to the range 5 to 60 degrees BTDC, and if out of range it will be clipped. Vacuum advance is a separate system that uses a small diaphragm assembly. As an example, 10 degrees of initial and 24 degrees of mechanical advance creates 34 degrees BTDC of total timing. Adding the mechanical and initial values together generates the total timing. ![]() The flame travels through the combustion chamber, igniting the air/fuel mixture. In a perfect world, The spark plug fires. Ignition timing is measured in degrees of crankshaft rotation, before top dead center (BTDC). I don't know what type of ignition system you're running but surely a relay to make the LT side live could be used to cut the ignition by simply switching off the power to the relay when you don't want the plugs to fire? Mechanical advance systems generally add between 20 and 30 degrees of timing. Ignition timing (or spark timing) controls when the spark plug fires during the Compression Stroke. when the exhaust valve is open to ignite fuel in the exhaust system). However, in order to implement anti-lag, surely all you want to do is fire your spark late (i.e. That means there’s no setting of the ignition timing to do, as it’s controlled by the ECU software (known as an ignition map). ![]() Of course that's assuming you aren't running a wasted spark setup because if you are, you're already effectively firing the spark at this time. If you want to simulate ignition cut, you could run at + (or -) 180 (plus or minus your normal advance) so you'd fire the spark when the cylinder was at the top of it's exhaust stroke before the inlet valve re-opens (this is where the Alfa twin-spark competition cars run their secondary spark as any fuel remnants will be burned here). This article will give you all the tips you need to confidently set the ignition timing on your 1986-91 Vanagon water-boxer engine with Digifant injection.
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