Exhaust Experiment Prep Questions - Fuelly Forums

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

Reply
 
Thread Tools Display Modes
 
Old 06-10-2006, 11:06 AM   #1
*shrug*
 
Join Date: Sep 2005
Posts: 6,195
Country: United States
Exhaust Experiment Prep Questions

So far I've got the stock exhaust and a Civic HF/CX/STD/VX (came off the CX) exhaust to test.

Anyway, I know A-B-A is good, and this'll be my first test ever, so I was just wondering, can I get away with not doing A-B-A, because depending on how hard the install is, I might die ripping it apart a bunch of times, though I could prolly use the practice,

Also, anyone else got exhausts to donate?
__________________

SVOboy is offline   Reply With Quote
Old 06-10-2006, 11:19 AM   #2
Registered Member
 
krousdb's Avatar
 
Join Date: Feb 2006
Posts: 1,480
Country: United States
Location: Raleigh, NC
A-B-A is best. But if you are planning on A-B-C-D then you really need to make sure that there are no other variables. A-B-A is best. Did I say that already?
__________________

__________________


krousdb is offline   Reply With Quote
Old 06-10-2006, 11:22 AM   #3
*shrug*
 
Join Date: Sep 2005
Posts: 6,195
Country: United States
Eh, I guess I'll get my header swap time down to 15 minutes, I guess I'll add it to my list of skillz that I can sell to people this summer,

I'll prolly do aba, but meh.

I need to find some exhausts to test, I can prolly borrow one from jared.
SVOboy is offline   Reply With Quote
Old 06-10-2006, 01:25 PM   #4
Registered Member
 
MetroMPG's Avatar
 
Join Date: Dec 2005
Posts: 4,223
Country: United States
I'd start with some easier data collection - get a baseline speed v. mpg graph.

But if you're set on looking at mods, I'm with Dan: A-B-A

If you can find a good level test route, and a calm day, I think you'll be surprised at how much the MPG readout can vary on multple runs (at the same speed) even when you change nothing at all.

It's also surprisingly difficult to hold a dead-even speed without cruise control.

The other thing is if you're changing things that take some time to replace, the drivetrain (not just engine, but bearings, tires, tranny, etc.) will cool down while you're working, so you need to make sure each test has enough warmup distance.

Have fun at graduation! Mine was a good time for sure. I remember it pretty well. A group of us ended the night with breakfast at my parents' house.
MetroMPG is offline   Reply With Quote
Old 06-11-2006, 07:49 AM   #5
Registered Member
 
GasSavers_Ryland's Avatar
 
Join Date: Mar 2006
Posts: 1,325
Country: United States
Send a message via AIM to GasSavers_Ryland
how about doing A-B-C-D-A??? so you test all your exuast systems for however long you need to make sure you have a solid number, then switch, and after you test them all, go back to the first one, and make sure you still have the same number.
GasSavers_Ryland is offline   Reply With Quote
Old 06-11-2006, 08:16 AM   #6
*shrug*
 
Join Date: Sep 2005
Posts: 6,195
Country: United States
Eh, I dunno, I'll do something simple to practice up my testing skillz, I guess, *shrug*
SVOboy is offline   Reply With Quote
Old 09-24-2006, 11:07 PM   #7
Registered Member
 
kwtorbe's Avatar
 
Join Date: Sep 2006
Posts: 168
Country: United States
Would a performance tubular header, like a hedman made chikara tork-step header w/ equalizer in the 2 tube part of the 4-2-1 decrease or increase fuel economy? Less backpressure should increase efficiency, but maybe o2 sensor placement being further away and scaveging will allow more fuel to be used....Has anyone done this and found results one way or another?
kwtorbe is offline   Reply With Quote
Old 09-25-2006, 12:15 AM   #8
Registered Member
 
Join Date: Aug 2006
Posts: 541
Country: United States
Hi kwtorbe - ?Less backpressure should increase efficiency?

There is a LOT more into exhaust system design that just backpressure.

What complicates the matter is a market place full of junk.
I have seen bought tubular headers (extractors) with wildly varying construction quality.
Some also had the wrong dimensions (tube lengths) suitable for the recomended application., and almost all had differing lengths between the tubes of the same set.
(Typically in a 4 into 1 extractor all of the 4 pipes will be of the same length.)

When required we made our own extractor systems and did them rite an dthere was a power improvement over other mass produced sets.

For FE applications never believe the makers of these exhaust parts FE test results.
Any FE increase from them is more likely come from exposing an extremly poor factory part.(eg a very tight crush bend)

Because of so many varying factors involved You will need to test these parts for yourself and see what works on your vehicle.- But I wouldnt spend too much money.
onegammyleg is offline   Reply With Quote
Old 09-25-2006, 02:25 PM   #9
Registered Member
 
kwtorbe's Avatar
 
Join Date: Sep 2006
Posts: 168
Country: United States
Thanks gregW----I am planning on installing a Chikara tork-step header on my HX civic. I got it used and fairly cheap and really am just interested to see what if any improvements are made on FE. I like the hedman brand because I have used their headers on my old gas guzzling '68 Charger for horsepower and the quality was nice--mandrel bends were great. I need to get a MPG computer or something so I can tell more accurately what improvements different mods make other than always filling the tank and dividing the odometer reading by gallons....
kwtorbe is offline   Reply With Quote
Old 09-25-2006, 04:15 PM   #10
Registered Member
 
tomauto's Avatar
 
Join Date: Apr 2006
Posts: 292
Country: United States
Send a message via AIM to tomauto Send a message via MSN to tomauto Send a message via Yahoo to tomauto
Be careful with that HX. where will you be putting the new Cat?
__________________

__________________
Current Stable
GasSaver: 2000 Honda Insight Silverstone w/AC 65+mpg
Track Terror: 2002 Honda S2000 Gran Prix White- lots of mods - 28mpg
Beater: 1988 Honda Civic DX Hatback - Stripped - 30mpg

RIP: 1996 Honda Civic LX 42mpg - you will be missed

http://tomauto.smugmug.com/Cars
tomauto 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
Incorrect mileage calculation? tonedepear Fuelly Web Support and Community News 6 04-04-2011 01:04 AM
Keeping my distance in traffic khurt General Fuel Topics 8 09-07-2008 04:23 AM
No EPA Est for 2007 Chrysler Town & Country jklaiber Fuelly Web Support and Community News 1 08-23-2008 01:15 AM
Make / Model/ Year averages jeadly Fuelly Web Support and Community News 1 08-15-2008 12:02 AM
Poll... Do you wear seatbelts? GasSavers_Jack General Discussion (Off-Topic) 33 06-28-2006 07:53 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 12:39 PM.


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