exhaust help
Thread Starter
|
New User
Joined: Sep 2008
Posts: 21
Likes: 0
From: Georgia
exhaust help
I just recently put a new exhaust system and headers on my truck. Its just shorty headers with true dual 2.25 in exhuast with glasspacks. no cats and oxygen sensor bung is in the headers. Before this installation i was getting arround 13 MPGs. Now im only getting arround 8 MPG. I think my prob is not enough backpressure. I love the sound of the exhaust but the mileage is too rough. I dont mind down grading to a muffler thats a little more quiter but with a good tone. Whats a good muffler choice. i was thinking on trying the summit chambered mufflers or a flowmaster 40 series. and i saw that dynomax makes a muffler called ultra flow x. which has almost like an x pipe built into it and is a muffler. Do i need an h or an x pipe to help me out also. Thanks
Hotshot
Joined: Sep 2001
Posts: 11,958
Likes: 228
I bet your gas milage drop is from pushing the loud pedal more because you like how it sounds.
I don't see any way that doing what you did made your gas mileage drop that much. It should not have dropped at all.
I would recommend keeping your glasspacks over going with any chambered muffler. They drone inside the cab and sound hollow. If you want some good sounding mufflers go with Dynomax Ultraflow. I had Flowmaster before and I'll never guy it again. I wish muffler shops wouldn't push it so much. Its not a very good muffler and all the kids think its the greatest because of that.
I would keep it true duals. I don't see the point of going through making it true dual and then running one muffler.
By the way changing out your glasspacks with mufflers is not going to do much of anything to change your gas mileage.
I don't see any way that doing what you did made your gas mileage drop that much. It should not have dropped at all.
I would recommend keeping your glasspacks over going with any chambered muffler. They drone inside the cab and sound hollow. If you want some good sounding mufflers go with Dynomax Ultraflow. I had Flowmaster before and I'll never guy it again. I wish muffler shops wouldn't push it so much. Its not a very good muffler and all the kids think its the greatest because of that.
I would keep it true duals. I don't see the point of going through making it true dual and then running one muffler.
By the way changing out your glasspacks with mufflers is not going to do much of anything to change your gas mileage.
Hotshot
Joined: Sep 2001
Posts: 11,958
Likes: 228
I think your best bet is to run the codes to see if there are any. Then you can go from there.
A good tune up, with fresh fluids and filters from front to back wouldn't hurt either. Stick with Motorcraft or Autolite plugs, and quality wires cap and rotor. For filters go with Motorcraft, Wix, or Purolator.
You could also run some Seafoam in the tanks. That might help with dirty injectors.
Maybe add a new O2 sensor to the list.
A good tune up, with fresh fluids and filters from front to back wouldn't hurt either. Stick with Motorcraft or Autolite plugs, and quality wires cap and rotor. For filters go with Motorcraft, Wix, or Purolator.
You could also run some Seafoam in the tanks. That might help with dirty injectors.
Maybe add a new O2 sensor to the list.
Postmaster
Joined: Oct 2009
Posts: 3,432
Likes: 7
True duals are going to reduce your engines ability to scavenge spend exhaust from the cylinders, which will reduce the volumetric efficiency, which in turn reduces the power, which is compensated by increasing throttle, which reduces fuel efficiency.
What year, model, engine do you have? An X-pipe might help, though x-pipes work best closer to the motor while mufflers work better further back.
Adding backpressure will not help, backpressure will only hurt power. Velocity is what you need. The faster the exhaust moves through the pipe, the more efficiently it can scavenge, especially at low RPM and light throttle positions, which is where fuel economy occurs.
What year, model, engine do you have? An X-pipe might help, though x-pipes work best closer to the motor while mufflers work better further back.
Adding backpressure will not help, backpressure will only hurt power. Velocity is what you need. The faster the exhaust moves through the pipe, the more efficiently it can scavenge, especially at low RPM and light throttle positions, which is where fuel economy occurs.
Thread
Thread Starter
Forum
Replies
Last Post
GI8U2racing
1987 - 1996 F150 & Larger F-Series Trucks
9
Apr 29, 2010 03:12 PM
