performance exaust, mpg increase? - Page 4 - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 09-21-2009, 08:11 PM   #31
Site Team / Moderator
 
Jay2TheRescue's Avatar
 
Join Date: Sep 2008
Location: Northern Virginia
Posts: 4,657
Country: United States
Location: Northern Virginia
HC - Let me tell you, its hard. It is possible to slide a 2 1/2" flex pipe over a 2 1/2" hard pipe, but its not easy. The leak was almost never right at a joint. I usually had to work the flex down the pipe a foot or 2 to make it to the spot that was leaking. Personally, I will probably never do it again. Its quicker to just replace the pipe instead of trying to shimmy a piece of flex over it. If you do try it, make sure you have plenty of WD-40 on hand. Lube it up well, and slide it on. Its gonna smoke like hell for the first day or so as the WD-40 burns off though.
__________________

__________________






Jay2TheRescue is offline   Reply With Quote
Old 09-21-2009, 08:54 PM   #32
Banned
 
Join Date: Jul 2009
Posts: 427
Country: United States
hehehehe
i meant to say 10mpg could occur if you remove a clogged cat, shiazzz

dirrrr,

I guess the question is, would using a high flow cat increase mpg and decrease emissions? or increase mileage and increase emissions?
__________________

spotaneagle is offline   Reply With Quote
Old 09-22-2009, 05:20 AM   #33
Site Team / Moderator
 
Jay2TheRescue's Avatar
 
Join Date: Sep 2008
Location: Northern Virginia
Posts: 4,657
Country: United States
Location: Northern Virginia
Arrow

Quote:
Originally Posted by theclencher View Post
...or a Tornado...

Always lacking is proper and consistent documentation, as well as test controls to minimize variables, of which the placebo effect is a biggie.
The Tornado was an expensive mistake that I made when I was young & stupid. The only thing it saved was space in my wallet by removing an excess $80.
__________________






Jay2TheRescue is offline   Reply With Quote
Old 09-22-2009, 06:34 AM   #34
Senior Member
 
Mayhim's Avatar
 
Join Date: Jun 2012
Posts: 179
Country: United States
My best mileage came from the CRX after I removed the muffler and ran a straight pipe out the back. This was done due to the deterioration of the muffler and was a short term fix.

It's hard to tell, though, whether the improvements came from the reduced back pressure or the removal of a distinct disruption of airflow (the sea-anchor effect).
Mayhim is offline   Reply With Quote
Old 09-23-2009, 04:31 PM   #35
Banned
 
Join Date: Jul 2009
Posts: 427
Country: United States
i would think on a car that is up in the 37mpg range already would probably see the greatest gains out of this, kinda like holycow said basically, a 1mpg gain on a 20mpg car= 2/3mpg gain out of 40 mpg cars
spotaneagle is offline   Reply With Quote
Old 09-23-2009, 09:56 PM   #36
Senior Member
 
Join Date: Mar 2011
Posts: 446
Country: United States
Location: Charlotte nc
the idea of performance modifications improving milage is sound if they are removing inherent inadequacies in the system. Take for instance my LW200 there are some inherent problems with this car. The Factory exhaust manifold is awfully restrictive and actually hurts milage by causing reversion in the ports. Once this is replaced with a more proper manifold milage improves. Contrary to popular opinion this car does not like a short ram intake but rather simply removing restrictions in the factory airbox has far more effect. Basically one must understand what is hurting milage and what can be done to help.
Philip1 is offline   Reply With Quote
Old 09-24-2009, 06:24 PM   #37
Banned
 
Join Date: Jul 2009
Posts: 427
Country: United States
let me clear this up
hehehe

more air does not necessarily mean better mileage, your map sensor measures amount of air and compensates with more or less fuel in correlation with many other sensors

removing restriction from the vacuum of the intake or exhaust system allows a car to do what it does easier this is why a K and N filter would give you better mileage, because it allows air to more easily pass through it
spotaneagle is offline   Reply With Quote
Old 09-24-2009, 06:47 PM   #38
Banned
 
Join Date: Jul 2009
Posts: 427
Country: United States
yes by real scientists, anyhow i was remarking on the concept, but honestly you're right I wont ever buy one, probably another autozone rip off scheme, I like puralator, I hear good things
spotaneagle is offline   Reply With Quote
Old 09-24-2009, 07:36 PM   #39
Registered Member
 
Join Date: Apr 2008
Posts: 1,259
Country: United States
Location: wiliamsburg virigina
My Echo accelerates at less than 1 inch of manifold vacuum in 5th gear at 30 MPH, about 1275 RPM. That's with a totally stock induction system, at less than 30% of throttle.

Last 2500 miles my average is 53.25 MPG, in a car that is rated at 32 combined on the new EPA ratings.

Probably haven't seen over 3000 RPM in over 1000 miles.

The Insight managed 22.5 miles this morning at 81.7 MPG going 45 MPH for 7 miles and 57 MPH for all but 1.5 miles of the rest of the trip, in heavy interstate traffic with a tractor trailer passing me 1 car length behind a Chevy HHR, who was barely two car lengths behind the car in front of him.
Total mileage today was 56.1 miles at 75.6 MPG. New EPA combined is 43 MPG.

K&N filers were tested in heavy construction equipment using oil analysis and they do not do a good job of getting the dirt out of the air, potentially severe engine damage.

I'll stick with the stock setup. I don't see any potential mileage improvement from any performance modification, since I never use anything close to the power I already have.

regards
gary
__________________
R.I.D.E. is offline   Reply With Quote
Old 09-24-2009, 08:14 PM   #40
Registered Member
 
Join Date: Nov 2007
Posts: 1,111
Country: United States
Send a message via AIM to dkjones96
I get K&N because it's reusable. I've never noticed a performance or mileage gain from using them. If they made a resuable made from recycled materials I'd buy that but they don't.

I don't worry about the particles that get past these filters. You'd be amazed what can pass through an engine without damaging anything. I had a friend shatter a stock Chamion plug trying to pull it from his 3.9L Dakota(no idea why they torque the plugs at the factory so much) and he just started it and let the engine run until the ceramic insulator pieces and copper electrode passed out the exhaust and it runs great.

The majority of oil filters are rated to only 10-15 microns and K&N has a decent air filtering capacity down to 5. If particles that size don't kill it in the oil I don't see how it would in the air.
__________________

__________________
- Kyle
dkjones96 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuelly Android App - eehokie Fuelly Web Support and Community News 2 07-14-2010 09:59 PM
hello, found your site through reading an article. wireless0ne Introduce Yourself - New member Welcome 3 07-12-2007 09:03 PM
Bought new BFGoodrich Long Trail T/A Tires Bill in Houston General Fuel Topics 0 06-29-2007 01:56 PM
MID Install SVOboy Experiments, Modifications and DIY 33 06-04-2007 11:27 AM
Electrical power and cars. DracoFelis Automotive News, Articles and Products 2 09-16-2006 02:31 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 04:07 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.