Key Component Roles

| # Performance and Economy Fields |

Performance and Economy fields are simply turned on for you to start monitoring the Power and Fuel economy of your vehicle. All you need is either a speed channel from your ECU or a GPS attached for TunerStudio to capture speed from. When using a GPS and 10Hz GPS is highly recommended.

In this section I will be going over how to fill in the required information for using the performance and economy fields.

Performance Fields :

The performance fields allow you to make calculated estimation of several different types of data like Aerodynamic Drag, net HorsePower ,
net Torque, and Rolling Drag .

Economy Fields :
The economy fields allow you to make calculated estimations of several different types as well. Your distance traveled in your fuel
consumption “MPG” “MPL” “KPL” , the rate at which you are pumping the fuel into the engine “CC per min” “gallons an hour” “lbs per hour” ,
and instant measure of distance vs. fuel consumption, this is similar to the first calculation I talked about in the economy section but with
a slight difference the first calculation is the distance traveled and fuel consumed over a long distance or extended sample range, where
the instant will give you the calculated fuel you are using that very second as you mash the accelerator down.

Entering Vehicle Specifications :

To use these features you will need to fill in the information in the Vehicle Specifications dialog .
This dialog can be fond under the “Data Logging” drop down menu, then click on the performance and economy fields option.

- Primary Injector Size (cc) – Enter the size in cc/min of the the primary / main injectors for your engine. If your injectors are
  measured in lbs / Hr you will need to convert to cc / min. To covert from lbs / Hr to cc / min you will typically multiply by 10.5 .

- Fuel Flow Preferences – Here you will select the units of measurement for your speed and fuel consumption .

1. Speed Units – Miles Per Hour or Kilometers Per Hour

2. Fuel Consumption – US Gallons, Imperial Gallons, Liters

- Input Source – Here you select what input drives your speed measurement . The options

  in this drop down will vary with ecu type and firmware .

1. GPS speed – will use a external GPS source to capture your speed .

2. VSS 1 and VSS 2 – Are typically a option you will see with MS2,s and MS3,s
this allows you to use a ADC in your MegaSquirt to read in a signal
from a factory or aftermarket tranny or drive shaft speed sensor.

- Vehicle Weight – In this field you will need to enter the gross vehicles weight including the weight of the driver and all fluids.

- Vehicle Weight Units – Here you will need to select what units you entered the gross vehicle what in . You have to options lbs or kilograms .

- Tire Pressure (PSI) – Enter the tire pressure that you commonly fill your tires to .

- Frontal Area – Frontal area is a projected vehicle area as seen from the front . You may be able to find your vehicle's frontal area value in various online sources or find a technical drawing you can use to figure it out.

- Frontal Area Units – Here you will select the units in which your frontal area is measured
  1. sqft – Square Feet
  2. m^2 – Square Meters

- Aerodynamic Drag Coefficient – is a figure that measures the force of air resistance on a object. You can typically find the (Cd) of your vehicle online

- Log Power Fields – Here you will select if you wish to data log the different fields

  available HP & TQ, HP, TQ, and DRAG.
  1. OFF – No data will be captured
  2. Log HP & Tq – This option will allow you to select “Power”
  and “Torque” from the data log profile editor.

3. Log HP , Tq & Drag – This option will allow you to select “Power”
and “Torque” from the data log profile editor as well as automatically puts
“Aerodynamic Drag” , “Rolling Drag” , and Accel Power” in the logged fields menu .

©2010 EFIAnalytics.com