• Register Today It's free! This box and some ads will disappear once registered!

^^Searches ExplorerForum.com^^

Exhaust back pressure


04sd

Member
Joined
December 20, 2007
Messages
53
Reaction score
0
City, State
pa
Year, Model & Trim Level
'05 F150, '84 Ranger
I've got a 4.0 in my Bronco II and I'm currently running the original 2.9 exhaust system minus the cat. The muffler is about 1/2 the length of the Explorer muffler. Do you think this is hurting performance and/or gas mileage?
 


Join the Elite Explorers for $20 per year. Gets rid of the ads! New $5 per month "try out" option.

Explorer Forum has probably saved you that much already, and will continue to save you money as you learn how to diagnose fix problems yourself and learn which modifications work without having to experiment on your own. Elite Explorer members see no advertisements, no banner ads, no double underlined links, can add their own profile photo, upload photo attachments in all forums, and Media Gallery, create and save more private Conversations, and more. Join Today. Your support is greatly appreciated.




tigercat

Active Member
Joined
June 12, 2008
Messages
308
Reaction score
0
City, State
Perry, Fl
Year, Model & Trim Level
'92 sport
it all depends on the pipe diameter anything between 2.00"-3.00" is plenty:)
 




Blacksheep Josh

Slinky+Escalator=Fun
Joined
July 31, 2006
Messages
3,682
Reaction score
11
City, State
Statesboro, GA
Year, Model & Trim Level
'01 Ford Ranger, RIP 93 X
I think there's a Bronco subforum on here... might have more luck over there. If not, I'd say message 410Fortune, from what I know he's the BroncoII expert round these parts, lol
 




Anime

EF YEAH!!
Elite Explorer
Joined
November 6, 2000
Messages
5,445
Reaction score
31
Year, Model & Trim Level
2018 EX Sport Concept
It's probably holding it back some, but even the factory exhaust for the 4.0 held it back.

If you're worried about it, adding a 2.25" exhaust with your choice of a performance muffler might be just the ticket.
 




Masterd

Active Member
Joined
October 16, 2005
Messages
807
Reaction score
5
City, State
Upland, CA
Year, Model & Trim Level
1993 Explorer Sport
Yeah even the stock 4.0 system is probably holding it back a little.

I think it'd be safe to say the 2.9 system might be marginally more so.
 




04sd

Member
Joined
December 20, 2007
Messages
53
Reaction score
0
City, State
pa
Year, Model & Trim Level
'05 F150, '84 Ranger
I've got an almost new Explorer exhaust system, I'll have to measure the pipe size compared to the Bronco. I'd really like to keep it quiet so maybe I can fit the Explorer muffler, given I'm not running a cat it should still flow pretty good.
 




Masterd

Active Member
Joined
October 16, 2005
Messages
807
Reaction score
5
City, State
Upland, CA
Year, Model & Trim Level
1993 Explorer Sport
The cat(s) are probably where the most restriction takes place, and I'm also sure that the factory pipe is crush bent as well, probably hurting flow there too.
 




HahnsB2

Active Member
Joined
March 15, 2008
Messages
784
Reaction score
1
City, State
Battle Ground WA
Year, Model & Trim Level
88 Bronco II
Other than the muffler the 2.9 exhaust is almost identical.
 




Anime

EF YEAH!!
Elite Explorer
Joined
November 6, 2000
Messages
5,445
Reaction score
31
Year, Model & Trim Level
2018 EX Sport Concept
Stock pipe size is 2", but 2.25" makes a huge difference in terms of flow and exhaust gas velocity.

If you want quiet but better than using the stock muffler, you can go with a Dynomax Super Turbo. They have mufflers with a 20" long case, like the 17747, which is what comes on the cat-back systems for 91-92 Explorers. It's pretty quiet.
 




Thread starter Similar threads Forum Replies Date
P Exhaust pressure / Starting issue? Stock 1991 - 1994 Explorers 3
1 Is it wrong to install heads with exhaust manifold atached Stock 1991 - 1994 Explorers 5
M Cat Back Exhaust - Stock or Custom? Stock 1991 - 1994 Explorers 1
D muffler or Cat back exhaust kit Stock 1991 - 1994 Explorers 5
massacre Exhaust Manifolds? Stock 1991 - 1994 Explorers 3
C 94 Explorer stock exhaust pipe size Stock 1991 - 1994 Explorers 2
G Oil leaking from behide the exhaust manifold bad thing? Stock 1991 - 1994 Explorers 1
C Exhaust system with a silencer of the Russian truck ! Video! Sound! Stock 1991 - 1994 Explorers 6
M Engine Tick or exhaust system? Stock 1991 - 1994 Explorers 8
S Exhaust Replacement on 1991 Explorer Stock 1991 - 1994 Explorers 7
X exhaust flange bolt stuck Stock 1991 - 1994 Explorers 5
ld50 Gasoline from exhaust -FPR replacement Stock 1991 - 1994 Explorers 11
Number4 Exhaust manifold to pipe bolts Stock 1991 - 1994 Explorers 34
S Exhaust question Stock 1991 - 1994 Explorers 5
EMBRACETHEHATE89 exhaust leak Stock 1991 - 1994 Explorers 5
W Exhaust Leak Stock 1991 - 1994 Explorers 3
Number4 Getting to exhaust manif. nuts Stock 1991 - 1994 Explorers 12
K Terrible exhaust noise Stock 1991 - 1994 Explorers 2
L.A.X Ripped out my stock 1st Gen exhaust Stock 1991 - 1994 Explorers 5
R need urgent help with my exhaust Stock 1991 - 1994 Explorers 1
mr cribb new top end, now oil is blowing through the exhaust Stock 1991 - 1994 Explorers 25
mr cribb Horrendous exhaust odor Stock 1991 - 1994 Explorers 21
W Heads and Exhaust Bolts Stock 1991 - 1994 Explorers 13
W Dual Exhaust Stock 1991 - 1994 Explorers 15
A Exhaust Help!!! Stock 1991 - 1994 Explorers 4
D DynoMax Exhaust Stock 1991 - 1994 Explorers 17
D Thicker exhaust manifold gaskets? Stock 1991 - 1994 Explorers 13
T 94 Eddie; Carbon from exhaust; carbon fouled plugs... Stock 1991 - 1994 Explorers 29
S Exhaust Removal Stock 1991 - 1994 Explorers 4
C Exhaust sucking air in...oil leaking by cylinder 6 & manifold Stock 1991 - 1994 Explorers 46
D exhaust question on Navajo Stock 1991 - 1994 Explorers 5
1 Exhaust preference/opinions wanted. Stock 1991 - 1994 Explorers 8
W Exhaust flange gasket and spring/bolts? Stock 1991 - 1994 Explorers 3
B Exhaust redo for '94 Eddie Bauer @ 190k Stock 1991 - 1994 Explorers 4
P $60 cat back exhaust Stock 1991 - 1994 Explorers 10
C Exhaust manifold... cracked help! Stock 1991 - 1994 Explorers 3
D Gurgle/popping exhaust plus IAC troubles Stock 1991 - 1994 Explorers 0
C Quiet exhaust advice. Stock 1991 - 1994 Explorers 3
B No Resonator on Exhaust Stock 1991 - 1994 Explorers 6
S New Exhaust Pipes. Stock 1991 - 1994 Explorers 12
J exhaust leak! Stock 1991 - 1994 Explorers 1
M White smoke and gasoline coming out of exhaust? Stock 1991 - 1994 Explorers 5
F Exhaust questions. Stock 1991 - 1994 Explorers 3
T 92 4 door exhaust Stock 1991 - 1994 Explorers 11
J Exhaust specs Stock 1991 - 1994 Explorers 7
T My exhaust is falling apart Stock 1991 - 1994 Explorers 188
S Flame is coming out of the exhaust manifold. Stock 1991 - 1994 Explorers 18
T manifold exhaust bolts Stock 1991 - 1994 Explorers 5
J driver side exhaust manifold Stock 1991 - 1994 Explorers 0
C Exhaust Question: Y-pipe to CAT connection? Stock 1991 - 1994 Explorers 1

Similar threads

Top