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Driveability and Emissions Calculation Software

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All your diagnostic calculations in one software application!
Designed by technicians, for technicians.

Diagnostic calculations such as: volumetric efficiency (VE), lambda, and combustion efficiency (CE) have gained popularity in recent years. Until now, all of these calculations have not been available in one place.

DECS (Driveability and Emissions Diagnostic Calculation software) has put all of these calculations together in one application. No more looking at a gas analyzer for one calculation, a web site for another, and a software program for yet another. Everything a technician needs is now at his/her fingertips.

DECS is a compilation of diagnostic calculators, some already commonly used, to
aid technicians in diagnosing driveability and emissions issues. These calculations
have been improved upon and assembled in one application in order to streamline
the diagnostic process.

In addition to the calculations mentioned above DECS incorporates many more calculations that can be of valuable diagnostic use. And unlike most other calculators, DECS supports multiple fuel types. Alternative and flex fuel vehicles become more common by the day. DECS allows technicians to use these calculations accurately on a much wider range of vehicles.

Input your data and let the calculators do the work. DECS will even highlight results in bright RED that appear to be out-of-range, questionable or undesireable.

CD Contents
The CD contains the following calculators:
* Lambda (for Gasoline, E85, CNG, and more) (for Pre- and Post- Cat)
* Combustion Efficiency (also for multiple fuels)
* Volumetric Efficiency
* Fuel Requirement
* Air Fuel to Lambda
* Catalyst Efficiency
* Emissions Reduction Goal Calculation
* Various other Conversion Calculators
Email support and Updates are free of charge to registered users.

PC Requirements
Windows compatible PC running Win 98 or higher. Not compatible with Mac or Android.

Written by: Scott Shotton
Scott Shotton has been a full time technician for the past 15 years. The past 12
years of which have been with the same independent repair shop. He has also been
teaching automotive courses at the College of DuPage for 6 years. He has a degree
in Automotive Service Technology as well as many hours of training by
manufacturers and independent training entities. Scott is also recognized as an
Illinois state emissions repair technician. Scott was also a technical trainer during
his 8 year Army career. His experience in the field, extensive education, and
positive attitude make him an asset to the automotive repair industry.

Please note:
- All sales are final for this product. 
- We accept returns for an exchange in the event that the item is damaged while in transit. 
- To be eligible for a replacement, you must email us pictures of the damaged product within 7 days of receiving the product.



Calculator for Lambda

The DECS Lambda Calculator is a fully functional lambda calculator.


DECS default values are set for gasoline because it is still the most common fuel source for modern automobiles. But what happens if your exhaust analyzer reports a lambda number for gasoline, but the fuel being burned is really E85* Are the numbers you trust for accurate diagnosis correct? No.


DECS Lambda Calculator is been programmed with the appropriate values for multiple fuel types: USA gasoline, oxygenated gasoline, European gasoline, diesel, E85, CNG, and LPG.


The lambda calculator also reports air fuel ratio and % rich or lean. Red text warns the user of a result that could be undesirable.


Exhaust leaks and secondary air injection can discredit lambda values. An additional calculation added to the DECS lambda calculator is oxygen dilution value. The oxygen dilution value is provided to warn of possible air leaks in the exhaust system (or the presence of secondary air injection) that could skew the lambda calculator's results. If too much oxygen dilution could be present, DECS displays the oxygen dilution value in red and highlights any fields that could be incorrect due to the dilution in yellow.


Remember, the lambda calculator works for both pre and post catalytic converter gas samples. The results remain the same.



Calculator for Combustion Efficiency

If lambda is a measure of how well an engine was fueled, combustion efficiency is a measure of how well the fuel introduced into the engine was burned.


Just like the lambda calculator, the DECS Combustion Efficiency calculation accounts for multiple fuels. Most gas analyzers, and software, report CE based on gasoline characteristics. DECS takes all of the same multiple fuels from the lambda calculation into account. The CE output of the calculator also appears in red when the value is poor.


Unlike a lambda calculator, a combustion efficiency calculation is different for pre and post catalytic converter gasses. If the catalytic converter is functioning further combustion occurs in the catalyst. Therefore, a post gas reading should show a higher CE result than a pre gas sample.




Calculator for Volumetric Efficiency




The Volumetric Efficiency calculator determines the engine's ability to pump air.


Measuring VE helps you diagnose restricted intake systems, restricted exhaust systems, air metering problems, and/or mass airflow sensor issues. Questionable values are highlighted in red.





Calculator for Fuel Requirement




The fuel requirement calculation is automatically performed during a VE calculation. It can used to figure desired fuel quantity for a volume test when specs are not on hand.


In the screen shot shown above, a 5.7 liter engine operating at 4336 RPM would require approximately 1.66 liters per minute.


Its outputs reflect the required amount of fuel to maintain the correct air fuel ratio for the conditions and entered fuel type. A second set of outputs has been provided (+20%) to account for acceleration enrichment.





Calculator for Air Fuel to Lambda Conversion




The Air Fuel Ratio to Lambda Conversion Calculator is used to convert an air fuel ratio to a Lambda number. It is dependent on what type of fuel is being burned, so you must enter a fuel type. The calculator displays undesirable values in red. Fuel type selections include Gasoline, E85, Diesel, CNG, LPG, Methonal.





Calculator for Catalyst Efficiency




DECS catalyst efficiency calculation can be used to determine how well a catalytic converter does its job reducing each gas.


This calculation requires the measurement of pre and post converter gasses. Each gas is independently calculated and the results are a percentage output the represents the efficiency at which the catalytic converter reduces each gas.


Note: These results of this calculation could vary depending on engine operating conditions. For accurate results to be achieved the vehicle should be in good fuel control, and the catalytic converter should be fully warmed up, to insure proper catalyst operation.





Calculator for Emissions Reduction Goal Calculation




Useful for repair verification of an IM-240 failure when you are limited to a conventional gas analyzer. 


Thd calculator helps you equate constant sampling gas analyzer information to common exhaust gas analyzers.  Constant sampling systems are sometimes used by state emissions inspection programs. Since the constant sampling systems actually weigh the gasses in the exhaust stream the outputs are often expressed in grams per mile.


Common analyzers provide outputs in percent or parts per million. These two different readings make repair verification difficult. The goal calculator figures a goal based on the state's readings and a before repair baseline test drive.



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