Toms 50th Ani
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- 3.8L VT executive 50th Aniversary
A mate of mine was telling me the other day that the exhaust pressure (or flow) descreases itself from the end of the extractors right down to the exhaust tip therefore there is an uneven balence of pressure along the pipes.
He said by installing a Venturi that is half an inch smaller than your exhaust pipe just after where the extractors join up (collector i think), it equalises out the exhaust pressure to the exhaust tip and giving more airflow therefore providing more power.
This Venturi isn't big or anything, think of it like a bowtie where the pipe goes from 2.5inch (at the collector) then only a few CM's down it shrinks down to 2inch then expands back to 2.5inch for the rest of the exhaust system.
I know your thinking that this is restricting airflow and that was my immediate response too but he claims its only at a cirtain point (right after the collector) does it provide any beneficial gain and anywhere else along the pipe will cause a decrease in power.
Apperently in Nascar racing, this was a ruling to limit the cars power and after experimental testing, this is what they found.
ya thoughts?
He said by installing a Venturi that is half an inch smaller than your exhaust pipe just after where the extractors join up (collector i think), it equalises out the exhaust pressure to the exhaust tip and giving more airflow therefore providing more power.
This Venturi isn't big or anything, think of it like a bowtie where the pipe goes from 2.5inch (at the collector) then only a few CM's down it shrinks down to 2inch then expands back to 2.5inch for the rest of the exhaust system.
I know your thinking that this is restricting airflow and that was my immediate response too but he claims its only at a cirtain point (right after the collector) does it provide any beneficial gain and anywhere else along the pipe will cause a decrease in power.
Apperently in Nascar racing, this was a ruling to limit the cars power and after experimental testing, this is what they found.
ya thoughts?