A/R to CM - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 5 (permalink) Old 04-11-2008, 11:33 PM Thread Starter
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A/R to CM

Does anyone know what a .81 A/R turbine housing is in CM ? How bout a .68 A/R to CM?
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post #2 of 5 (permalink) Old 04-14-2008, 04:53 PM
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A/R is a ratio, so it can vary from turbo to turbo. A= Area of exhaust inlet and R= Radius of the housing from the center of the turbine wheel to the center of the exhaust inlet. The Area divided by the Radius is your A/R. So really you need to know your A/R and either the inlet area or the Radius, you can't figure it out with 2 variables remaining, there are too many possibilities.

What turbos did you have in mind? If you know the inlet type, like T3 for example, that will give you a decent idea of what you're dealing with since most t3's will have roughly the same inlet area.
Sean

2000 2500 reg. cab 4x4 auto 577hp
09 6.7L QC LB stick, 4x4.

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post #3 of 5 (permalink) Old 04-15-2008, 03:11 AM Thread Starter
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Quote:
Originally Posted by sstockton
A/R is a ratio, so it can vary from turbo to turbo. A= Area of exhaust inlet and R= Radius of the housing from the center of the turbine wheel to the center of the exhaust inlet. The Area divided by the Radius is your A/R. So really you need to know your A/R and either the inlet area or the Radius, you can't figure it out with 2 variables remaining, there are too many possibilities.

What turbos did you have in mind? If you know the inlet type, like T3 for example, that will give you a decent idea of what you're dealing with since most t3's will have roughly the same inlet area.
Sean

The turbo kit i want is from turbonetics. It is a stage 2 turbo for powering up to 550 HP. 66MM compressor wheel. 68 mm or 69 mm turbine wheel, and the the turbine housing comes .81 A/R but i am going with a .68 A/R for better spooling on the street. It also comes with a full 4" opening at the back of the turbo for a 4" downpipe which is in the kit.
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post #4 of 5 (permalink) Old 04-15-2008, 05:19 AM
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Yeah the smaller A/R will work better for you. The bigger A/R will allow you to flow more exhaust, but if you're looking for quick spool up and building boost go with the smaller housing.
Sean

2000 2500 reg. cab 4x4 auto 577hp
09 6.7L QC LB stick, 4x4.

TOTAL PERFORMANCE DIESEL 707-545-FUEL (3835)
www.totalperformancediesel.com
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post #5 of 5 (permalink) Old 04-16-2008, 01:44 AM Thread Starter
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Quote:
Originally Posted by sstockton
Yeah the smaller A/R will work better for you. The bigger A/R will allow you to flow more exhaust, but if you're looking for quick spool up and building boost go with the smaller housing.
Sean
:thanks: i appreciate the help. :Thumbup:
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