[GzT]

Tuning Drag Race Anti-lag
The basic idea is to fire the ignition after TDC to cause afterburn in the exhaust to
spool the turbocharger to a desired boost level for launching the vehicle. There are a
couple of things to consider to obtain the desired results.
· Engine Speed: The amount of engine speed is directly related to how much boost
can be made under anti-lag conditions. A higher engine speed will equate to a
higher boost level as well as a faster boost response. If you are unable to make the
desired boost pressure for launching, no matter how much ignition retard is used,
then more than likely you need to increase the Alt On Above RPM.
· Ignition Retard: The more the ignition is retarded, the more afterburn and heat will
be put into the exhaust. Start at a conservative -10 degrees, and add more ignition
retard until the desired time and boost is reached. Typical numbers are between -
15 and -20 degrees of ignition. Either the Alt Spark Fixed or the Alt Spark Trim
can be used for retarding the ignition.
· Engine Load: If the boost control is set at "x" pressure, then no more "x" pressure
can be obtained when launching. The option Alt Overboost, however, will allow a
lower launch boost than the operating boost setting, by turning OFF the alternate
function when the engine load has surpassed the option.
· Additional Fuel: Added fuel will also aid in the anti-lag process by insuring the fuel
mixture will