remove stock exhaust baffles ok? - Page 4 - Harley Davidson Forums

Dyna Glide Models Super Glide, Super Glide Sport, Super Glide Custom, FXR Super Glide, Dyna Glide Convertible, Super Glide T-Sport, Dyna Glide Police, Dyna Switchback, Low Rider, Street Bob, Fat Bob and Wide Glide.

remove stock exhaust baffles ok?

Thread Tools Search this Thread
Old 07-17-2016, 10:30 PM
dlporter's Avatar
dlporter dlporter is offline
One Of The Regulars
Join Date: Apr 2015
Location: Pacific Northwest
Posts: 199
Thanked 20 Times in 19 Posts

Wow, this thread was raised from the dead twice.
Reply With Quote
Old 07-12-2017, 01:54 PM
rnrobert rnrobert is offline
New Member
Join Date: Jun 2017
Location: philadelphia,pa
Posts: 58
Thanked 0 Times in 0 Posts

Originally Posted by FBRR View Post
I can't believe how a "little" information can be turned around!

"removing the baffles could add reversion" THIS IS WRONG

First, removing the baffle "decreases" reversion, it does not increase reversion! Reversion acts to increase low to midrange torque. Therefore if reversion is reduces ( less backpressure by definition equals less reversion!) you may feel less torque at low to mid throttle.
Less backpressure can lead to more Max. Hp. at wide open throttle, IF!!
BIG IF you can get enough fuel to take advantage of that decrease in backpressure!

" it is a closed loop so the ECM will only allow so much air or fuel regardless" This is also technically wrong!

Second! The ECM has no control over AIR into an engine ( except in the case of drive by wire where the throttle is opened by the ECM software but opening the throttle is not part of close loop control ECM control during closed loop is a fuel only correction! Not AIR). But even then the restriction to airflow is the intake ( aircleaner and exhaust) not THE ECM software control.
The ECM only attempts to maintain the correct air/fuel ratio through closed loop operation! ( by changing delivered FUEL, the ECM cannot change airflow! That is a function of restrition in the air cleaner!)

The "ECM" or more correctly the ecm software the controls fuel, can modify fuel slightly. And if you only open the exhaust, there should be enough "learning" to compensate for a little less backpressure. If you also open the intake ( aircleaner) you then would need to have fuel modified through either re-programing or an add on device!

Even with "just an open exhaust" there is a possiblity that during open loop operation at Wide Open Throttle(WOT) you can still have an overly lean condition! Some closed loop "learning" affects "open loop" fuel delivery.
But it may not account for every "speed and load" point during WOT operation! And without proper A/F ratio at WOT, you will not gain any Max. Hp. by the decrease in backpressure!

Bottom line, you will most likey not need a "fueling" device for just an open exhaust. You will most likely loss some low and mid-range torque. Without adding fuel you will not gain HP. at WOT!

I hope that allow you to make a more informed choice!
Very correct statement the ecm ecu or what ever you wanna call it is the computer and can only adjust specific af ratio in closed loop. open loop is pre programmed but luckily the epa wants open loop for as short of a time as possible ie heated o2 sensors. the ecm can and will take care of( af) ratio in closed loop with just a exhaust probably no problem at all. im actually curious how far it could adjust with a air cleaner and exhaust. everyone says you need a fuel management system but has anyone seen readings without one installed. like how lean will it be. i know a car can go pretty far to the point of a small vacuum leak untill its to far for the ecm to adjust ?
Reply With Quote
Old 07-13-2017, 12:24 AM
VoiceofReason44 VoiceofReason44 is offline
Club Member
Join Date: Mar 2014
Location: Cool, CA
Posts: 775
Thanked 275 Times in 140 Posts

Just go get a thunderheader or basani road rage. Save yourself the pain and potential power loss.
Reply With Quote
Old 07-13-2017, 11:24 PM
Nemosengineer's Avatar
Nemosengineer Nemosengineer is offline
Club Member
Join Date: Feb 2009
Location: Murrieta Ca.
Posts: 712
Thanked 170 Times in 132 Posts

Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Exhaust Baffles Cb1000h Dyna Glide Models 2 09-20-2017 11:44 AM
Straightshots popping after off throttle 7yler Exhaust System Topics 8 05-22-2017 12:42 AM
Removing Baffles From 2016 Sportster NCollins85 Sportster Models 11 09-10-2016 12:38 PM
16 Roadglide CVO baffle removal DBL.G316 New "Rushmore" Models 9 04-20-2016 09:32 AM
removing stock exhaust baffle SeanSS84 Sportster Models 5 03-23-2016 03:40 PM

baffels, baffles, davidson, dyna, exhaust, glide, harley, harleys, hd, motorcycle, problems, remove, removing, reviews, stock, wide

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

Forum Jump

Featured Sponsors
Vendor Directory

All times are GMT -5. The time now is 07:59 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 and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: