Relationship between PAIR valve, Engine Braking and Exhaust Scavenging - Suzuki GSXS1000 Forum
User Tag List

 1Likes
Reply
 
LinkBack Thread Tools
post #1 of 17 Old 09-07-2019, 11:24 PM Thread Starter
Senior Member
 
Join Date: Jul 2016
Location: India
Posts: 118
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 51 Post(s)
(Thread Starter)
Relationship between PAIR valve, Engine Braking and Exhaust Scavenging

So I just blocked in my pair valve mainly to get rid of the pops and bangs in the after run and immediately noticed an increase in engine braking. I have fuel cut disabled in the Ecu.

But I fail to understand how blocking pair affects engine braking, since itís totally on the exhaust side of things.

Since engine braking has increased I am feels a slight jerk in throttle, kind of like a little of snatchiness.

Also does anyone also know about how pair valve blocking affects exhaust scavenging, since there is less air now present in the exhaust due to pair being blocked, I believe there is low air pressure in the headers which I think will suck the exhaust gases out more efficiently, donít know but I may be wrong.

That being said, I feel loss of power and torque in the lower revs

Confused
CtrlU is online now  
post #2 of 17 Old 09-07-2019, 11:29 PM
Senior Member
 
Cainus83's Avatar
 
Join Date: Jan 2019
Location: Toowoomba, QLD, AU
Posts: 296
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 112 Post(s)
Quote:
Originally Posted by CtrlU View Post
So I just blocked in my pair valve mainly to get rid of the pops and bangs in the after run and immediately noticed an increase in engine braking. I have fuel cut disabled in the Ecu.

But I fail to understand how blocking pair affects engine braking, since it’s totally on the exhaust side of things.

Since engine braking has increased I am feels a slight jerk in throttle, kind of like a little of snatchiness.

Also does anyone also know about how pair valve blocking affects exhaust scavenging, since there is less air now present in the exhaust due to pair being blocked, I believe there is low air pressure in the headers which I think will suck the exhaust gases out more efficiently, don’t know but I may be wrong.

That being said, I feel loss of power and torque in the lower revs

Confused
Did you only block the PAIR valve and touch nothing else? I agree, blocking it shouldn't have any noticeable negative effects.

When life throws you curves, lean into them.
Cainus83 is online now  
post #3 of 17 Old 09-07-2019, 11:34 PM
Senior Member
 
My Name Is Jeff's Avatar
 
Join Date: Feb 2019
Location: Australia
Posts: 256
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
It’s only going to stop the popping on decel so none of this makes sense?
Have you still got the o2 sensor hooked up and running if so turn it off.
My Name Is Jeff is offline  
 
post #4 of 17 Old 09-08-2019, 01:15 AM Thread Starter
Senior Member
 
Join Date: Jul 2016
Location: India
Posts: 118
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 51 Post(s)
(Thread Starter)
Quote:
Originally Posted by Cainus83 View Post
Did you only block the PAIR valve and touch nothing else? I agree, blocking it shouldn't have any noticeable negative effects.
Yes just a rubber cap inside the airbox to block airflow. Nothing else was touched my ecu is flashed I have the o2 sensor out, exhaust valves taken out, using after market headers and secondaries from Paul but with the stock can in the end.
CtrlU is online now  
post #5 of 17 Old 09-08-2019, 01:16 AM Thread Starter
Senior Member
 
Join Date: Jul 2016
Location: India
Posts: 118
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 51 Post(s)
(Thread Starter)
Quote:
Originally Posted by My Name Is Jeff View Post
Itís only going to stop the popping on decel so none of this makes sense?
Have you still got the o2 sensor hooked up and running if so turn it off.
No the 02 sensor and exhaust valves are taken off since I replaced the stock exhaust with Paulís headers and secondary pipes. Just retained the stock end can..
CtrlU is online now  
post #6 of 17 Old 09-08-2019, 02:07 AM
Senior Member
 
My Name Is Jeff's Avatar
 
Join Date: Feb 2019
Location: Australia
Posts: 256
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
So you turned the o2 sensor off so I’m assuming you have woolich flash?
I’ve had my bike woolich flashed plus pair valve hose blocked and it runs sweet.
I don’t get it?
My Name Is Jeff is offline  
post #7 of 17 Old 09-08-2019, 02:12 AM Thread Starter
Senior Member
 
Join Date: Jul 2016
Location: India
Posts: 118
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 51 Post(s)
(Thread Starter)
Hmmm yes I have done woolich flash, weird why I am getting more engine braking and less power in lower revs ��
CtrlU is online now  
post #8 of 17 Old 09-08-2019, 02:23 AM
Senior Member
 
My Name Is Jeff's Avatar
 
Join Date: Feb 2019
Location: Australia
Posts: 256
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
Have you got the woolich flash tool?
My Name Is Jeff is offline  
post #9 of 17 Old 09-08-2019, 03:50 AM Thread Starter
Senior Member
 
Join Date: Jul 2016
Location: India
Posts: 118
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 51 Post(s)
(Thread Starter)
Quote:
Originally Posted by My Name Is Jeff View Post
Have you got the woolich flash tool?
Nope, why did you ask?
CtrlU is online now  
post #10 of 17 Old 09-08-2019, 05:39 AM
Senior Member
 
My Name Is Jeff's Avatar
 
Join Date: Feb 2019
Location: Australia
Posts: 256
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
Just wondering if you might or accidentally turn something on with the flash tool.
My Name Is Jeff is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Suzuki GSXS1000 Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome