What cat-back system for my D1???
#11
TECH Resident
iTrader: (4)
Right and I have seen 750hp out of a 3" does it mean that its optimal? Hell no! We are talking about when it becomes a restriction. Horsepower is all about cfm. Now one square inch of tubing will support about 115cfm. You want about 2.2cfm per engine horsepower. Doing simple math you arrive at 6.49 square inches on a 3" exhaust. That means about 747 cfm or 339hp. 3.5"=8.95"^2 or 1029cfm or 468hp. Can you build much more horsepower than that? Absolutely, but I am talking about perfect efficiency in an ideal environment.
#12
Right and I have seen 750hp out of a 3" does it mean that its optimal? Hell no! We are talking about when it becomes a restriction. Horsepower is all about cfm. Now one square inch of tubing will support about 115cfm. You want about 2.2cfm per engine horsepower. Doing simple math you arrive at 6.49 square inches on a 3" exhaust. That means about 747 cfm or 339hp. 3.5"=8.95"^2 or 1029cfm or 468hp. Can you build much more horsepower than that? Absolutely, but I am talking about perfect efficiency in an ideal environment.
On that note 5" exhaust seems to be about the biggest I've ever seen used , plenty of vehicles pushing that well over what its' " limit" with great results.
Carry on!
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