exhaust back pressure
i recently bough an 07 2 door jk and decided to drop the muffler to see what it sounded like...supprizingly its not very loud, and its deep. however, i didnt notice the torque seemed flat under 2000rpm. the cats are still on, so i figured there would be enough back pressure. has anyone else noticed this? i like a deep sounding jeep..who doesnt, but at the cost of performance im not sure its worth it. opinions?
Without a muffler you'll lose backpressure which will affect your low-end torque. Taking off the muffler is a trade-off to acheive more open flow at higher RPMs where backpressure would start to work against your engine. If you want the deep sound you are probably better off going with an aftermarket muffler that will still provide some backpressure so you have the low end torque for off-roading.
an aftermarket "catback" system is the best compromise of back pressure for max torque though often at a compromise of sound inside and out, ...the stock exhaust seems fine and mufflers don't wear out w/ unleaded fuel use much anymore, perhaps the stock exhaust with a similar fitting aftermarket muffler might gain something but, I like the quiet now in my life and the ability to listen to the radio at a low volume. The new JK's do just that!
A well know phenomenon in racing and motorcycles - open pipes (called drag pipes) are loud and help high end rpms and power, but really hurt at the low end. I second a cat back system if you don't like the stock sound.
08 JK 23S - Colorado Jeep Club No. 204
Too much to list - see my profile for details on build
16 JK Rubi with all the trimmings
NRA Life member
"It takes a special kind of stupid to believe criminals will follow gun laws."
I do not consider myself a smartass. I point out the obvious, search for the truth, and speak fluent sarcasm. I am, by experience, an accomplished curmudgeon.
Originally Posted by Rescue13 View Post
|exhaust , JK Wrangler , low end torque , system , Torque , wrangler|
|Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)|
|Thread||Thread Starter||Jeep Forums||Replies||Last Post|
|no pressure back brakes||J33pFr33k||YJ Wrangler Technical Forum||5||03-07-2009 05:43 PM|
|Exhaust back pressure for a 4.0?||Spectravision||TJ Wrangler Technical Forum||2||02-11-2009 11:08 AM|
|No cat = back pressure Problems?||tanewsome||TJ Wrangler Technical Forum||9||02-04-2009 01:20 PM|
|Excess back pressure?||jking352||YJ Wrangler Technical Forum||1||01-11-2009 09:58 AM|
|Oil Pressure Gone, Then Back...Problem?||bigchevyman24||TJ Wrangler Technical Forum||9||01-10-2008 01:32 AM|