# How to Calculate Turbo Sizing

Save

A turbo's trim sizing is calculated by a ratio of measurements from the turbocharger's compressor wheel. The trim spec of a turbo can be a useful measurement in determining the turbo's airflow capability, as generally a higher trim level equates to a higher flow rate. As manufacturers often use the same turbocharger housing on multiple turbos, calculating your turbocharger's trim level is also a way to determine the model and spec of an unknown turbo.

### Things You'll Need

• Tape measure
• Pencil
• Paper
• Measure the compressor wheel's inducer diameter with a tape measure. This is the wheel on the intake side of the turbo, also known as the "cold side." The inducer diameter is that of the wheel's smaller blades, by which air is drawn in. Record this measurement in millimeters, as this is the universal measurement for trim levels.

• Measure the exducer diameter of the compression wheel. This is the larger portion at the rear of the wheel. Record this measurement in millimeters.

• Calculate your turbo's trim spec by squaring the inducer diameter, then dividing it by the square of the exducer diameter. Multiply the result by 100. The product is your turbocharger's trim in millimeters.

## References

Promoted By Zergnet

### You May Also Like

• How to Calculate Trims & Binding Yardage

Calculating trim and binding yardage is a common process for most crafters who are working without patterns. If your project has a...

• Small 16G Turbo Trim Specs

The Mitsubishi Small 16G 60 trim turbo is a very common turbocharger used in custom turbo kits. The 16g turbos are plentiful,...

• How to Calculate Ring Size

Accurately measuring your finger for rings is pretty simple.

• How to Measure Your Window for Curtains

• How to Pick a Correct Turbocharger Size

Turbo selection isn't what it used to be. Once upon a time, self-proclaimed engineers were content to build an engine that produced...

• How to Measure Bra Size

Finding the right bra means purchasing a bra that is both comfortable and supportive. According to "Body Drama" by Nancy Amanda Redd,...

• How to Measure Wheel Size

Car wheel size can be determined by several methods. All of these methods are correct and can be used when ordering tires....

• How to Calculate Turbo CFM

A turbo compressor flow map is generally measured in cubic feet per minute, or cfm. The cfm of airflow is affected by...

• How Do I Install an A/C Compressor in a Jeep Cherokee?

The compressor in your Jeep Cherokee air conditioning system drives refrigerant through the A/C system and pressurizes the refrigerant gas so it...

• How to Explain a Turbo Engine

Turbos are used on many late-model vehicles to enhance the performance of small displacement engines---usually four-cylinder engines. The small displacement engines ...

• How to Silence Air Compressors

An air compressor is a device that pressurizes air for use in pneumatic tools, inflation and painting. Unfortunately, air compressors can be...