Originally Posted By MR_P_BODY
Originally Posted By DaveRS23
Originally Posted By hemi-itis
I'm also thinking that back pressure is diluting the combustion chamber causing it to go lean,,,,,,,,,,, shruggy


If there were enough back pressure just off idle to significantly impact the fuel mixture, what would be happening at WOT?

confused


IF it had that much back pressure it would do 1 of
2 things at higher rpm.. 1.. it would blow the exhaust
off the car(at any one of the joints).. or 2.. it wouldnt
make the rpm... its making some rpm (I dont know how many
rpm he is turning) so at idle/just off idle he shouldnt
see any issues at those rpms... he HAS to put a gauge on
it to see what his back pressure TRULY IS and work from
there.. when I was testing all sorts of exhaust I did see
a system blow the pipe off during a test.. needless to say
we didnt use that system.... the nice little inward roll on
the exhaust tip(on the chrome tips) was a 3hp loss with just
that inward roll on the tip(thats back pressure due to flow
loss).. most people would never think that would be a issue
EDIT
to check the idea of the mixture going lean.. one way
to test that.. pull the exhaust off(open it) and run
it with a A/F meter... On my Rampage I went with elec
dumps just so I didnt pull the exhaust but yet reduce
the back pressure
wave



My question was really meant to be rhetorical.

And I also went with electric cut-outs because getting a relatively quiet exhaust to flow my 500" engine kept getting more and more complicated and more and more expensive. And frankly, the only way to truly know what combo was going to work, was to install it and test at the track back to back. But that would require buying a lot of pipes and mufflers besides being a bunch of work.

The Doug's cut-outs are sure-fire at the track and are a lot of fun at shows and cruises. Plus, I get to listen to the radio and/or talk to my passenger while driving down the road.

Master, again and still