Maxima Forums - Naturally Aspirated Tuning Discussion

What data is important when looking at dyno tuning a N/A Maxima?

I got to thinking about this as I saw a gentleman tuning a ’87 Mustang with a ’03 Cobra motor with a Kenne Bell SC. He was looking at fuel pressure, timing, boost, as well as the a/f, hp, and tq from the dyno. I now have the ability to data-log a lot of my ECU parameters. I was curious as to what may be of interest when dyno tuning, as well as street tuning.

Some of the parameters I can now data log are: (yes, I know some of these will have no bearing on the need to tune)

• A/C (Refrigerant Pressure, Relay, Signal Switch)
• A/F Correction, Bank 1 & 2
• Absolute Pressure
• Accelerator Pedal Position 1 & 2
• Atmospheric Pressure
• Base Fuel Schedule
• Battery Voltage
• Brake Pedal Switch 1 &2
• Calculated Load Value
• Coolant Temperature
• Corrected Idle RPM
• Cruise (High Speed Cut, Set Lamp, Activate Lamp, Brake Switch, Low Speed Cut, Main Switch, Resume/Acc Switch, Set Switch, Speed Set-point)
• Electrical Load Signal
• Engine Speed
• EVAP (Canister Purge Control Valve, Canister Vent Valve, System Pressure)
• Fuel (Pump Relay, Tank Level, Tank Temperature)
• Idle Air Volume Learn Status
• Ignition (Switch, Timing Advance)
• Intake Camshaft (Advance Bank 1 & 2, Cont Sol. Bank 1 & 2)
• Mass Air Flow (Volts, gm/s)
• NB O2 Sensor 1 & 2, Bank 1 & 2 (Lean-Rich)
• NB O2 Sensor 1 & 2, Bank 1 & 2 (Voltage )
• NB O2 Sensor 1 & 2, Bank 1 & 2 (Heater)
• Power Steering Pressure
• Radiator Cooling Fan 1 & 2
• Start Signal
• Throttle Position Sensor 1 & 2
• Throttle Relay Control
• Traveled Distance After CEL
• Vehicle Speed

I can also advance/retard timing 2 degrees, as well as adjust my base idle 250 rpm. I can detect and clear DTC codes and clear learned fuel settings.

So, important data when tuning on a dyno is as follows:
Air Fuel Ratio (via wideband)
Horsepower (via dyno)
Torque (via dyno)
What else? (of the list above)