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ATG Volumetric Efficiency app

The Automotive Training Group, Inc. (ATG) provides live training classes and manuals and now offers on online Volumetric Efficiency (VE) app.

The app is also available for iOS and Android.

According to ATG's VE Calculator instructions, VE is a ratio of actual engine breathing volume to displacement. Testing VE is a high level indicator of an entire category of faults you may or may not need to check. It is often the best first test because it is very easy, and there are only two possible outcomes:

  1. The test passes, in which case you’ve just proven that you don’t need to check vacuum, whole-engine or single-bank compression, cam timing, or for intake or exhaust restrictions.
  2. The test fails, in which case you’ve proven that all of those possible causes are still on your list, and further testing is not a waste of time.


Performing a VE test is easy to do, all you need is:

  • A vehicle with a MAF sensor
  • A Scan Tool displaying the following PIDs
    • MAF in grams/second or pounds/minute
    • RPM
    • IAT (air temperature affects density)
    • Barometric value (or check online for current atmospheric pressure)
  • VE Calculator


And now with the ATG VE Calculator App, it is easy to determine the engine's breathing efficiency and interpreting test results.

Learn more about VE and try the calculator now:

Read an ATG case study that uses VE, The Choking Maxima, a 2000 Nissan Maxima with P0171 & P0174 codes for lean conditions on both banks. 

Each ATG training class includes a manual. Can't make it to the class, get the manual from AESwave.