generally speaking, could changing out the OEM resonator on the sedans or coupes, for that matter, lower back pressure, resulting in loss of low end torque?

and by "changing" i mean by replacing the stock resonator w/ something more free flowing, straight pipe, etc. w/ the same diameter inlet, core, and outlet.

i think if it did, it would be so minimal you wouldn't be able to notice from just driving impressions but i'd like to know all of your thoughts. thanks.

 

anybody? thoughts, opinions, etc.

 

Why would the stock one have any significant amount of "back pressure"? If you were that curious, I suppose running both a stock and whatever tube through a machine that can measure pressure drop would be the best way. Anything other than that, it's all guesses IMHO. The gains you are talking about would be so small, it probably wouldn't be measurable.
Put it this way, your 19" MRR wheels are probably hurting you performance many more times than anything around an intake tube could give back. Those are 1 pc cast wheels right? What's the weights on those?

 

haha yeah, they are freakin heavy. 27lbs.? not even sure. i changed out the OEM reso for sound but was curious if the reso would even give any back pressure, hence the question. but i did shave off about 20 lbs. by replacing the OEM reso!

 

Obviously back pressure is a function of rpm, so little if any measurable backpressure until torque peak rpm [point of peak gas flow per cylinder cycle] then it starts to increase exponentially.

Since HP is used to sell cars, engineers don't throw away much with exhaust systems now. Maybe 5 HP is forgone to meet lux quiet noise standards and 5 HP to comply with emissions.
In the rpm space between peak HP and redline is where the most back pressure occurs.

 

The Calsonic resonator on the OEM Mid-Pipe is already a straight-through design. I cut it out earlier this year to peer inside. It's not restrictive at all.

 

i changed out the oem resonator for more sound but then wondered if i had lost any power or back pressure b/c of the new custom midpipe i installed, along w/ the magnaflow. b/c i essentially now have a more free flowing system.

anyway, i obviously can't really "tell" but was just wondering, conceptually, if removing or replacing the resonator would have any significant impact on power loss or gain.

 

^ no i'm pretty sure sillie is right, and most of the backpressure comes from the muffler... resonator is just insulating the pipe

 

Actually, I think most of the "backpressure" (which isn't even a correct term as applied to exhausts) is from the exhaust tubing design and size. Cats probably come in 2nd). If you think of exhaust in it's correct term "exhaust gas velocity", things become much easier to understand.

 

idk, "back pressure" is used widely in this context ( http://www.google.com/search?hl=en&q=backpressure )
i do know the muffler has baffles and restrictions in it that reduce flow

 

Rice math is a widely used term also. Widespread usage /= correct.

Mufflers have baffles that reduce noise and resonance. If they reduce flow, it's not creating back pressure. It's reducing exhaust gas velocity.

 

yes, i never said it was correct, nor do i care...

back pressure, a simple concept, should be easy for you to understand

 

+10000000

whenever ricers people talk about "back pressure" they really mean "velocity".

 

Incorrect terminology and statements are always difficult for me to understand.

 

perhaps we should try to help the OP with his situation, rather than argue the semantics of exhaust terminology