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John at J&S John at J&S is offline
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Join Date: Dec 2005
Location: GARDEN GROVE, CA
Posts: 187
In your first post you say the spark was getting blown out after raising boost. I assume that was solved by increasing dwell?

Increasing dwell increases coil current. Energy stored in the coil goes up with the square of the current. Theoretically, if you double coil current, you quadruple the energy stored in the coil.

Others have analyzed your timing map and have said it's conservative, which can happen when you tune for "no knock".

No one wants knock, but some cylinders knock easier than others. Overall timing is compromised when adjusting for "no knock", robbing power from the more knock resistant cylinders.

Your Vems has the capability to do individual cylinder knock retard. It may even allow you to set timing offsets on a per cylinder basis.

I suggest you learn the system, install the sensors and start tuning/calibrating, or pay your tuner to do some or all of it.
Old 05-10-2020, 04:39 PM
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