January 2015 – Motor Vessel Ghost

Fuel Modifier Table

	1000	2000	3000	4000	5000	7000
WOT	0	0	0	0	0	0
6″	0	0	0	0	0	0
12″	+4	0	0	0	0	0
18″	+4	0	0	0	0	0

Spark Modifier Table

	1000		1750	2500	3500	4500	6000
WOT	0		0	0	0	0	0
9″	0		0	0	0	0	0
18″	+6		0	0	0	0	0
Target Idle RPM		665
Idle Fuel Mod		+16
Idle Spark Mod		-3
Idle Spd Activity		0
Idle Control		On
Closed Loop Fuel		On
Base Timg		Off
Rev Limiter RPM		6000
Tps		14
Transient fuel		0
Cold start fuel		0
Global fuel Mod		0
Global sprk mod		-4

Observed Issues:

O2 sensor shows running rich at idle (expected)

Warm start idle will often surge slightly.

Otherwise runs fairly well.

I get some exhaust backfiring at idle, fairly soft.

Actions Taken:

Retarded timing to solve pinging

Added Idle Fuel to solve surging.

History:

Previously had terrible idle surge issues.

The vehicle had been dyno tuned, but the idle was not set with the foot on the brake, thus did not pick up the load of the hydroboost power steering pump and related braking effect.

The solution was when I finally added significant fuel around idle.

There was a little pinging on hills, solved by retarding the spark.