What is pressure ratio on a turbo map?

“Pressure ratio is how much pressure the compressor stage will generate at a given speed relative to atmospheric pressure along with inlet conditions (filter restrictions). Pressure ratio is used instead of boost because atmospheric pressure changes with altitude and weather conditions” explains Temple.

How do I know what size turbo I need?

The calculation is simple: Divide the absolute outlet pressure that you think you want (14.7 + boost pressure) by the absolute inlet pressure that the Earth says you can have (14.7) and you’ve got your pressure ratio. Limiting yourself to a reasonable number is the hardest part.

What is compressor performance map?

A compressor map is a chart which shows the performance of a turbomachinery compressor. This type of compressor is used in gas turbine engines, for supercharging reciprocating engines and for industrial processes, where it is known as a dynamic compressor.

How do I reduce turbo surge?

How to Prevent Turbocharger Surging?

  1. Keep the turbocharger intake filter clean.
  2. Water-wash the turbine and the compressor side of the turbocharger.
  3. Proper maintenance and checks should be done for different turbocharger parts periodically.
  4. Soot blow should be done from time to time in case of economizer or exhaust boiler.

How do you calculate psi for boost?

You can ROUGHLY estimate max boost as follows. The 0.9 factor is the ~VE for the typical intake tract under non-boosted conditions. The number 3,456 is just a mathematical factor to make the units come out properly. 1,000/546 = 1.83*14.7 = 26.9 – 14.7 = 12.2psi is the approximate max boost at 6,000rpm with 1,000cfm.

How do you calculate compressor pressure ratio?

The compression ratio is the ratio of the absolute discharge pressure (psia) to absolute suction pressure (psia), found using the formula Discharge Pressure Absolute ÷ Suction Pressure Absolute.

What does the A r mean on a turbo?

Area over Radius
A/R stands for Area over Radius. It is defined as the inlet (or, for compressor housings, the discharge) cross-sectional area divided by the radius from the turbo centerline to the centroid of that area.

How do you read a compressor chart?

How To Read A Compressor Map – Turbo Tech

  1. Pressure Ratio. The pressure ratio along the X-axis represents the boost you intend to run.
  2. Airflow. The Y-axis represents airflow in pounds per minute.
  3. Efficiency Island.
  4. Wheel Efficiency.
  5. Surge Limit.
  6. Overspin Choke.
  7. Compressor Wheel Speed.

How is turbo compressor efficiency calculated?

The overall efficiency of a turbocharger is obtained by multiplying the compressor efficiency, mechanical efficiency, and turbine efficiency together to produce a single value of efficiency. The compressor efficiency can be found from the compressor’s performance map.