CFM Air Flow – Throttle Body
What is CFM? The air flowing through a product is measured in Cubic Feet per Minute, CFM. It’s important to flow test a performance throttle body and find the CFM rating. A 75mm Brand A throttle body, may not equal the performance of a 75mm Accufab throttle body.
This airflow analysis is important because, basically, an engine is an air pump. Based on the size of the engine and how fast it will be spinning, it will pump out a certain amount of air. Of course, there are many variables to CFM requirements, such as cylinder head flow capabilities, intake and exhaust manifold flow capabilities, etc… but the basic engine block will pump a certain amount of air over a specified period of time, measured in CFM. An Accufab throttle body is designed to outflow the stock throttle body, hence, providing more air to the engine for it to utilize accordingly.
ALL INFORMATION PROVIDED TO BE USED AS REFERENCE ONLY. THE PARTS USED IN TESTING ARE UNMODIFIED ITEMS UNLESS OTHERWISE SPECIFIED. THE DATA HAS BEEN COLLECTED OVER SEVERAL YEARS OF TESTING. ALL CFM ROUNDED TO THE NEAREST WHOLE NUMBER.
PRODUCTS TESTED:
All CFM ratings shown @ 28”:
Buick GN, 1986-1987
65mm – 649 cfm
70mm – 711 cfm
Dodge Viper
RT-10, Gen 1, 1992-1996 – 65mm – 611 cfm each
GTS Gen 2, 1996-2002 – 70mm – 697 cfm each
Chevy LS-1, 1998-1999 and up (with mechanical linkage)
Stock – 798cfm
75mm – 920cfm
90mm – 1369cfm
Ford Mustang 5.0L, 1986-1993
Stock – 495cfm
65mm – 664cfm
70mm – 787cfm
70mm (Race) – 896cfm
75mm – 924cfm
75mm (Race) – 1045cfm
80mm – 1142cfm
85mm – 1322cfm
90mm – 1369cfm
105mm – 1550cfm
Ford Mustang 4.6L, 1996-2004
70mm – 628cfm
75mm – 632cfm
Stock throttle body and plenum – 498cfm
70mm and Accufab plenum – 680cfm
75mm and Accufab plenum – 686cfm
Ford Mustang 5.0L, 2011-2012
84.5mm – 1183cfm
Ford Mustang Cobra, 1996-1998
and Mustang Bullitt, 2001
Stock – 1089cfm
Elliptical Mono Blade – 1284cfm
Oval Mono Blade – 1696cfm
Ford Mustang Cobra, 1999-2001
and Mustang Mach 1, 2003-2004
Dual 60mm – 1147cfm
Ford Mustang Cobra, 2003-2004
and Ford Lightning Pick-up, 1999-2004
Oval Mono Blade – 1696cfm
Ford GT, 2005-2006
Stock – 1590cfm
Dual 75mm – 1807cfm
Oval Mono Blade – 2090cfm
Accufab 4-Barrel Throttle Body
4150 style – 1215cfm
4500 style – 2128cfm
8500 style – 3600cfm
Mountain Motor “split Dominator style”
Dual 2.75-inches – 1849cfm (per unit)