Help with tuning?

[dave w]

Several gearhead-efi members, including myself, can "write" a "starter chip".

A starter is often described as a "best guess" for the fuel and spark tables based on the engine modifications.

For example, Vortec heads are a common engine modification to a TBI Engine. The spark tables for a TBI Engine vs. Vortec Engine are very different. The stock Vortec timing tables are a better match for a TBI engine has been modified with Vortec head, than TBI timing tables. Often a TBI engine that has been modified with Vortec heads requires a modified Vortec Timing Table for optimal performance. The stock Voctec Timing Table is a good "starting" point.

Tuning uses data logs, that have information a tuner uses to correct Knock Retard and Rich / Lean fuel conditions. Tuners use different methods to make tuning adjustments, I crunch data logs with Microsoft Excel (screen shots below). Trimalyzer is a good tool also (screen shot below).

dave w