Pair Valve Removal On A Vtec Issue

I have VFR 800 '04 version with Staintune's and K&N air filter, cat is still in. Power commander 3 on the way. I live in Ireland so VFR is the EU version if such a thing exists...

My problem is this, I have tried unpluging the solenoid that controls PAIR valve (picture 1- I'm pointing at it), after I rode the bike, I noticed it was backfiring at 5k RPM when I backed off the throttle.

I plugged the PAIR valve back in.

Then I blocked the feeder tube from the airbox to the solenoid with the plastic bag (Picture 2) as suggested in one of the PAIR Valve Removal posts, the bike started to run differently. Not bad, but different. Idle speed went down from 1400 to just 1000 RPM. But the engine was running like it was struggling or there was some resistance, it didn't feel right.

My question is there something I did wrong or did I miss something? Do I need the power commander or re-tune starter valves? I am mechanically minded and do most of my own servicing just never did much tuning before.

http://i674.photobucket.com/albums/vv106/lepri13/DSC00037.jpg
http://i674.photobucket.com/albums/vv106/lepri13/DSC00036.jpg

So you're not running O2 sensor eliminators? The PAIR valves add extra air to the exhaust, so without them, the O2 sensors will tell the ECU that the bike is running too rich, and so it will lean out the mixture to compensate. Regardless of this, disconnecting the PAIR valves does drop the idle speed and make it run differently, even with a Power Commander and the sensor eliminators. On my '01, it dropped the idle speed around 300rpm, and it doesn't feel as crisp on the throttle - sort of feels more ragged.

there are already threads about this (SEARCH!!) but in a nut shell you need to unplug the solenoid (wires), block the intake at the airbox (plastic cap) and block the pipe (if you're not removing the plumbing), AND raise the idle... doing just one of those things at a time will not acheive the aim of this mod, which is to eliminate the PAIR altogether.

[image: View Post]AB-Oz, on Aug 19 2009, 12:08 AM, said:

there are already threads about this (SEARCH!!) but in a nut shell you need to unplug the solenoid (wires), block the intake at the airbox (plastic cap) and block the pipe (if you're not removing the plumbing), AND raise the idle... doing just one of those things at a time will not acheive the aim of this mod, which is to eliminate the PAIR altogether.
Thanks, I was looking to see how much difference was there before doing the mode. Now I know its ok I will proceed with the full removal just needed to confirm its ok for bike to run like this. I will have 02 eliminators and PC3 non usb, and will remove the cat in the next month or so

[image: View Post]AlexP, on Aug 18 2009, 06:50 PM, said:

I have VFR 800 '04 version with Staintune's and K&N air filter, cat is still in. Power commander 3 on the way. I live in Ireland so VFR is the EU version if such a thing exists...

Yes it does, and the EU fuel mapping is different, which you'll need to take into account when installing the map for the PCIII.

We get the EU version in Aus and I have posted a map for mine which has the same mods.
My throttling is very crisp although I have the PC3 and use the accelerator pump utility.

[image: View Post]dogman, on Aug 19 2009, 12:40 PM, said:

We get the EU version in Aus and I have posted a map for mine which has the same mods.
My throttling is very crisp although I have the PC3 and use the accelerator pump utility.
accelerator pump utility :blink:
What is that?
PS any chance I can have a look at your map? I will get my PC3 soon and my cat should be gone in the next few weeks.

[image: View Post]AlexP, on Aug 20 2009, 06:18 AM, said:

[image: View Post]dogman, on Aug 19 2009, 12:40 PM, said:

We get the EU version in Aus and I have posted a map for mine which has the same mods.
My throttling is very crisp although I have the PC3 and use the accelerator pump utility.
accelerator pump utility :blink:
What is that?
PS any chance I can have a look at your map? I will get my PC3 soon and my cat should be gone in the next few weeks.


The map is here http://www.vfrdiscus...amp;showfile=78

The accelerator pump utility is a feature that momentarily enrichens the mixture a percentage that you determine for a duration that you determine when you open the throttle, much like the "accelerator pump" on older car carburettors.
Its effect is subjective, but it seems to give the throttle a crisper response, particularly noticeable when you blip the throttle changing down a gear..
You can read about it on the dynojet website.
From memory I think I have mine set at 95% sensitivity , 15% enrichment and 20 engine revolutions, but I would need to check.
Anyway, its something that is easy to play around with.

[image: View Post]dogman, on Aug 20 2009, 01:36 PM, said:

[image: View Post]AlexP, on Aug 20 2009, 06:18 AM, said:

[image: View Post]dogman, on Aug 19 2009, 12:40 PM, said:

We get the EU version in Aus and I have posted a map for mine which has the same mods.
My throttling is very crisp although I have the PC3 and use the accelerator pump utility.
accelerator pump utility :blink:
What is that?
PS any chance I can have a look at your map? I will get my PC3 soon and my cat should be gone in the next few weeks.


The map is here http://www.vfrdiscus...amp;showfile=78

The accelerator pump utility is a feature that momentarily enrichens the mixture a percentage that you determine for a duration that you determine when you open the throttle, much like the "accelerator pump" on older car carburettors.
Its effect is subjective, but it seems to give the throttle a crisper response, particularly noticeable when you blip the throttle changing down a gear..
You can read about it on the dynojet website.
From memory I think I have mine set at 95% sensitivity , 15% enrichment and 20 engine revolutions, but I would need to check.
Anyway, its something that is easy to play around with.
Thanks for the info, I really appreciate it.