Turbo??
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
A/R ratio.
The ratio of the exhaust inducer nozzle area (A) over the exhaust inducer radius (R) (measured from the center of the turbine shaft to the center of the inducer nozzle). This number gives you an indication as to the tradeoff between lag and high volume efficiency for a given configuration. When the A/R ratio is low, then the small inducer area creates high velocity flow at low volumes, thus improving spin up. A high A/R allows high volumes of gas to flow through the exhaust turbine, making the turbine more efficient at those high volumes, but it will then be sluggish to spin up.
The ratio of the exhaust inducer nozzle area (A) over the exhaust inducer radius (R) (measured from the center of the turbine shaft to the center of the inducer nozzle). This number gives you an indication as to the tradeoff between lag and high volume efficiency for a given configuration. When the A/R ratio is low, then the small inducer area creates high velocity flow at low volumes, thus improving spin up. A high A/R allows high volumes of gas to flow through the exhaust turbine, making the turbine more efficient at those high volumes, but it will then be sluggish to spin up.
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
I think that is a fair assessment. Since you don't have a chip yet I doubt you will notice any difference in the top end.
I don't think the gauges are a "must" prior to the housing, but you will get an increase in EGT's from the smaller housing, so it might not be a bad idea.
If you are seriously planning on chipping the truck I would definately recommend against the .84 housing. It is too small for a chipped vehicle that tows for a living.
I don't think the gauges are a "must" prior to the housing, but you will get an increase in EGT's from the smaller housing, so it might not be a bad idea.
If you are seriously planning on chipping the truck I would definately recommend against the .84 housing. It is too small for a chipped vehicle that tows for a living.
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