how much power am i losing? - Ranger-Forums - The Ultimate Ford Ranger Resource


2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 07-06-2009
jamesxEDGE's Avatar
Member
Thread Starter
iTrader: (1)
 
Join Date: Feb 2007
Location: Woodland Hills, California
Posts: 668
how much power am i losing?

running straight pipes?

I've had it like this for a while but i'm just wondering if it's really hurting to have little backpressure (only from the cats)
Reply With Quote
  #2  
Old 07-07-2009
Fx4wannabe01's Avatar
RF Veteran
iTrader: (23)
 
Join Date: May 2005
Location: Boring, Oregon
Posts: 21,721
where does your exhaust end? like...do you have tailpipes? or is it dumped after the last cat? if dumped after last cat, holy hell batman, gas chuggin' loud obknoxious gutless wonder.
Reply With Quote
  #3  
Old 07-07-2009
jamesxEDGE's Avatar
Member
Thread Starter
iTrader: (1)
 
Join Date: Feb 2007
Location: Woodland Hills, California
Posts: 668
oh yeah, hahahah it's dumped right after the cat. the loudness doesnt bug me anymore, idk it never really was loud to me to begin with, i liked the sound too personally
Reply With Quote
  #4  
Old 07-13-2009
964X4's Avatar
Member
 
Join Date: Feb 2008
Location: turlock ca
Posts: 87
i had dual tail pipes and one broke from four wheeling and i lost power...cut the other one off so its dumped after the cat and i got more low end power. its loud as hell but i love it.
Reply With Quote
  #5  
Old 07-13-2009
CBFranger's Avatar
Member
 
Join Date: May 2008
Location: Tampa Bay Area
Posts: 1,029
You dont lose power from reducing backpressure.

This has been a PSA.
Reply With Quote
  #6  
Old 07-13-2009
veNom_bz's Avatar
Member
 
Join Date: Jan 2009
Location: Belmopan, Cayo
Posts: 57
Quote:
Originally Posted by CBFranger View Post
You dont lose power from reducing backpressure.

This has been a PSA.
that isn't completely true. you need balance in everything. not enough or too much pressure will make it hard to evacuate exhaust gases.
Reply With Quote
  #7  
Old 07-13-2009
veNom_bz's Avatar
Member
 
Join Date: Jan 2009
Location: Belmopan, Cayo
Posts: 57
Quote:
Originally Posted by 964X4 View Post
i had dual tail pipes and one broke from four wheeling and i lost power...cut the other one off so its dumped after the cat and i got more low end power. its loud as hell but i love it.
having some "backpressure" helps with low-end responsiveness.
Reply With Quote
  #8  
Old 07-13-2009
jamesxEDGE's Avatar
Member
Thread Starter
iTrader: (1)
 
Join Date: Feb 2007
Location: Woodland Hills, California
Posts: 668
well isnt there still backpressure from the cats?
Reply With Quote
  #9  
Old 07-13-2009
Johnbaum13's Avatar
Member
iTrader: (1)
 
Join Date: Jan 2008
Location: Dallas, TX
Posts: 2,343
Yes there is back pressure from the cats, but if you dump it right after the cats, or a muffler for that matter, the exhaust gasses are just "tumbling" out of the pipe. To make the most power, you need about 18" of pipe after a muffler or cat to smooth the airflow back out, and regain some of the "scavenging" effect.
Reply With Quote
  #10  
Old 07-13-2009
IN2 FX4's Avatar
Member
 
Join Date: Feb 2005
Location: Costa Mesa, CA
Posts: 854
Back pressure is never good for an engine. What is good for an engine is to get the exhaust gasses out as efficiently as possible. A smaller pipe can deliver more torque than a larger pipe and that is usually mistaken as back pressure. Internal combustion engine exhaust gasses flow in pulses due to the individual firing of the cylinders. If a pipe is too large, these pulses in the exhaust pipe can stop or even instantaneously flow in the wrong direction. This results in inefficient flow of the gas and poor performance along with intermittent back pressure. Exhaust velocity is what is important, not back pressure.

If you use a pipe that is too small it will result in back constant back pressure and will choke the engine. The velocity of the gas will be high but will not be high enough to let the engine breath.

Every engine has an exhaust pipe size that is optimal for it. An open exhaust will usually let the engine breath better but sometimes a muffler can enhance low end torque by smoothing out the exhaust pulses along with other issues that are more complex.

I run an open exhaust in my race car, when I can, to maximize top end horse power. However, when I am required to run a silencer (single camber race flow master), I do get a slight increase in mid range torque to slightly offset the decrease in top end power. This has been confirmed on the dyno and has nothing to do with back pressure. I have been building my own race engines for over 20 years and have learned a lot from some very knowledgeable people during that time.
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Losing power at higher rpm's and hwy speeds Grrayner General Technical & Electrical 3 07-06-2014 06:50 AM
1988 Ranger 2.9 L V6 Losing Power After Driving matt1592 2.9L & 3.0L V6 Tech 3 06-01-2011 01:26 PM
3.0 Stalls, hesitation, Losing power. troy1100 2.9L & 3.0L V6 Tech 8 12-07-2010 01:38 PM
Engine losing power Twiztid 2.9L & 3.0L V6 Tech 23 11-28-2010 12:22 PM
check engine light flashing and truck losing power..help? Sonic04Edge 2.9L & 3.0L V6 Tech 5 08-17-2008 07:41 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -6. The time now is 02:40 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.