Mpatient
02-18-2006, 06:43 PM
This was originally posted in another forum by 1civic
"Wheel "trim" refers to the squared ratio of the smaller diameter divided by the larger diameter times 100. Generally, the larger the trim number the more flow the wheel has.
For compressor wheels , larger trim tends to mean slightly lower efficiency.
For "families" of turbine wheels (those with the same inducer diameter), larger trim usually means better flow with less backpressure but longer spool time.
A/R is a ratio of the exhaust discharge area vs the distance from the center of turbine wheel to the center of the cross sectional area. Smaller A/R housing has faster spool up. Bigger A/R housing has less back pressure, more flow for the top end.
.........Does This Help you at all......"
Now when referring to the smaller and larger diameters, what is being referred to the turbine diameter from inside to outside or what? and how does this effect apply towards increasing horse power? I know the more flow the more air to combust but still need more info I guess.
I'm truelly not trying to sound like an idiot I just don't have alot of experience with how turbos actually make power, and I'm planning on building my H22A and I truelly want to know what is going to be the most effecient way to meet my power requirements and what is just giong to be a waste of money.
"Wheel "trim" refers to the squared ratio of the smaller diameter divided by the larger diameter times 100. Generally, the larger the trim number the more flow the wheel has.
For compressor wheels , larger trim tends to mean slightly lower efficiency.
For "families" of turbine wheels (those with the same inducer diameter), larger trim usually means better flow with less backpressure but longer spool time.
A/R is a ratio of the exhaust discharge area vs the distance from the center of turbine wheel to the center of the cross sectional area. Smaller A/R housing has faster spool up. Bigger A/R housing has less back pressure, more flow for the top end.
.........Does This Help you at all......"
Now when referring to the smaller and larger diameters, what is being referred to the turbine diameter from inside to outside or what? and how does this effect apply towards increasing horse power? I know the more flow the more air to combust but still need more info I guess.
I'm truelly not trying to sound like an idiot I just don't have alot of experience with how turbos actually make power, and I'm planning on building my H22A and I truelly want to know what is going to be the most effecient way to meet my power requirements and what is just giong to be a waste of money.