How to measure "Trim" of a turbo?
Jun 30, 2009 | 02:55 PM
#2
TECH Addict
Joined: Feb 2004
Posts: 2,120
Likes: 0
From Forcedinductions.
Dp = smaller wheel diameter
Dg = larger wheel diameter
Within reason a higher trim wheel will flow more than a smaller trim wheel. (from Garrett)
What is the Trim of a turbo and how is it calculated?
Each turbine wheel and compressor wheel model generally have the same turbine diameter (highest diameter), but different steps (lowest diameter). Each type of step (trim), has different blowing characteristics.
* TRIM values are expressed as 45, 50, 55, etc... and can only go from 0 to 100. A value of 100 means Dp = Dg
* A large TRIM indicates a large turbine diameter.
* A TRIM of 55, gives 10% more caudal than a TRIM of 50.
* TRIM is used in the same way for turbine wheels as for compressor wheels.
* TRIM is calculated through the following formula.
TRIM = ( Dp / Dg )² x 100
Si Dg = 50 mm y Dp = 35 mm
TRIM = ( 35/50 )² x 100 = 49
Each turbine wheel and compressor wheel model generally have the same turbine diameter (highest diameter), but different steps (lowest diameter). Each type of step (trim), has different blowing characteristics.
* TRIM values are expressed as 45, 50, 55, etc... and can only go from 0 to 100. A value of 100 means Dp = Dg
* A large TRIM indicates a large turbine diameter.
* A TRIM of 55, gives 10% more caudal than a TRIM of 50.
* TRIM is used in the same way for turbine wheels as for compressor wheels.
* TRIM is calculated through the following formula.
TRIM = ( Dp / Dg )² x 100
Si Dg = 50 mm y Dp = 35 mm
TRIM = ( 35/50 )² x 100 = 49
Dp = smaller wheel diameter
Dg = larger wheel diameter
Within reason a higher trim wheel will flow more than a smaller trim wheel. (from Garrett)
Thread
Thread Starter
Forum
Replies
Last Post
GXPJAY
Trucks and SUV Classifieds
5
Feb 13, 2022 08:15 AM
Codog
GMT K2xx Trucks General Discussion
0
Aug 16, 2015 08:23 PM
