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      03-15-2013, 01:24 PM   #20
VCMpower
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Drives: 2010 Dakar, 2013 Fire Orange
Join Date: Jan 2010
Location: Victoria B.C.

Posts: 941
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Why do race cars and NHRA drag cars end their exhaust at the header? From a small pipe instantly into the largest pipe possible, the atmosphere. Do you feel the velocity should continue to increase until it exits the tailpipe? If so , why?

Quote:
Originally Posted by M3takesNYC View Post
Most of this is true but does not explain why you want gas that is already at its slowest point due to being cool, near the end, want to make it even slower and not efficiently exit the system as a smaller pipe (or atleast the same size as the rest of the exhaust) would do. If the whole thing was 3 inches then fine but 2.5 and than 3 at the end. Taking slow gases there and making them even less able to exit with slower velocity due to piping, being cool and being at the end of the system so has lost a lot of kinetic energy.

I was just looking for a reason which I don't think is unreasonable when people way 2k for an exhaust. Have we really gotten to the point we defend tuning companies just because of their name without a sensible explanation?

Its lacking those standards which allow companies to just sell products that lack any real quality or testing (not saying AA does this) but clearly you guys realize this happens all the time with unsubstantiated claims and people buying a crap load of products.

Was real simple, I don't doubt its a great AA system but can someone tell me an explanation that uses physics and makes sense to go from a smaller pipe throughout to a larger pipe at the end
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