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Originally Posted by Sox
'superroo' is spot on.
The CFM requirement of our little 4L is less than 400cfm at 6000rpm. Even at 7000rpm we're talking less than 450cfm.
This is based on 90% VE, which is a pretty serious street engine.
Standard engines are around 70%, mild engines are around 80%, and heavily modified street engines are around 90%.
Race engines can be 100% and more.
Our standard TB's flow around 550cfm.
Even at 8000rpm and 100% VE, our engines only require just over 550cfm.
Clearly a bigger TB is not needed.
All a larger TB will provide is touchier throttle, because at small throttle positions the large TB will be flowing more than a smaller unit. So we think throttle response has improved.
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A 60mm 5.0 windsor throttle body flows to 526cfm.
A 65mm acufab flows to 616 cfm
A 70mm tb flows to 726 cfm.
Our throttle bodies must flow around 680 cfm at 68 mm. Why did ford do this? They knew it wouldnt spin to 12000 rpm...
Our cars at 6000rpm need 390cfm!!
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