PAIR valve blockoff

Discussion in '6th Generation 2002-2013' started by Def-E-nition, Mar 22, 2007.

  1. Def-E-nition

    Def-E-nition New Member

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    Relevent to 6th Gen as well ???????
     
  2. jev.

    jev. over there

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    Yes. You can do the same to a 6th. I hear it helps smooth the throttle response.
     
  3. Def-E-nition

    Def-E-nition New Member

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    And thats about it ?

    You done it to yours yet sir ?

    Im curious , but I dont want to let my fingers go scratching when i dont know if it really makes a difference .....
     
  4. olderandfaster

    olderandfaster New Member

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    Did my '06 (bought new in January this year). Also have Staintunes and a PCIII. The final mod (so far) was the PAIR block. Noticeable improvement!
     
  5. olderandfaster

    olderandfaster New Member

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    Forgot to mention, I also fitted a K&N air filiter but BEFORE the PAIR block, so I believe the PAIR block improvement after the other mods, is a 'real' improvement.
     
  6. jev.

    jev. over there

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    Haven't done it yet, but probably will this weekend. From what I hear, it makes a noticeable improvement.
     
  7. U53FUL 1Di0t

    U53FUL 1Di0t New Member

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    umm..whats a pair valve mod? how do you do it? what bikes does it apply to? etc...
     
  8. Def-E-nition

    Def-E-nition New Member

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    ok I did it .
    simple and easy .

    I simply Blocked off the pipe leading to both valves .

    Basically , the pair valve was there to reduce emissions out the exhaust to pass some or other test .
    Anyhow , from what we can conclude , it boggles the o2 meter around by pumping fresh air through the exhaust - obviously this then leads the comper into thinking that the engine runs lean - and dumps a whole buncha fuel into the engine to compensate .
    meanwhile , back at the ranch , it is the PAIR valve misleadign the engine , so the computer does what it is programmed to do - it richens the mixture to compensate for this super-lean reading it gets .

    anhow - I did it .
    I cant tell a BIG difference yet , but Ill be watching it like a hawk.

    Theoretically , it SHOULD make a difference .....
     
  9. aotto

    aotto New Member

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    Also did it with noticeable improvement! No more popping on the overrun and a lot smoother around slow corners! I have 2 Bros pipes which also backfired a bit when gearing down. Since blocking the valves it has disappeared completely.

    Also no more of that odd "twaking" sound when revving the motor slightly. (Probably due to the opening and closing of the valves) I also had the SV's balanced some time ago which improved throttle response drastically.

    Now for gutting the cat!
     
  10. Def-E-nition

    Def-E-nition New Member

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    Talk to me Dude , Talk to me . Im next on that one as well , but so damn Busy at work I cant think whom to trust with the bike for a day to stick my cat open with a screwdriver ......

    Loving the bike , Dreading NOT having my Frikkin License yet , but working on it .
    Luckily i live in such a small town , not much hassle with the coppers .

    So you say you noticed a change ?Ill have to double check my Findings then ...............
    Gutting the Cat- Anything else tyou need to do that goes with it ?no o2 sensor mod or anything ?
     
  11. aotto

    aotto New Member

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    I've checked out the threads on Bikersoracle.com as well. Some guys mention that they've gutted the cat but talking about using angled crow bars and a four pound hammer scares me shaitless!

    Think I'm going to chat to one of those exhaust franchises to cut it open, remove the bottom half, gut the insides and weld it back together again. All under my strict supervision of course!

    Will try it out and then do the O2 sensors. I'd rather do it bits at a time instead of laying out all the cash and not really knowing what made the big difference!

    Coppers here are rof these days! Roadblocks and impounding unlicensed bikes and bikes with illegal / no plates on a public holiday. Carting them off on trailers. Not a pretty sight but lets not get into the debate of us "criminals" that love speed while the real criminals roam free etc. etc....!

    I saw a black 2006 VFR the other day. Awesome!
     
  12. Def-E-nition

    Def-E-nition New Member

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    hmmmmmmmm.. i must check out my findings then ......

    Whats this about doing the o2 sensors too ? Do you have to do that As well ?? i just want to remove the Cat man .


    Having the Engine work through that Cat reminds of something we call "broeknaai" ....... You never get to feel the real thing , because its like talking through your Jersey sleeve ....lol

    i reckon the Cat holds the bike back some as well .
    not the colour choice I really wanted , but , ahh well , when you steal something for R66k and a new one is R93k , with 1500km on .. My broe , then you sit tight and accept the colour no matter what .
    i just picked up a used Mint Shark helmet - Rsf2i Prisma , the Black One 9Prisma only comes in black , Im doff ) for R18 00 . you reckon Its an Ok helmet ?

    What the Heck is an SV ?? Starter valve ????????
     
    Last edited: Mar 26, 2007
  13. aotto

    aotto New Member

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    You don't have to do the O2 sensors as well but what I've read in all the threads, it seems worthwhile!

    Ja, I know the expression very well! My motto is keep it simple! Why all this sophisticated emission control stuff that messes with potential optimized performance?

    I agree, R66K is a hijack never mind a steal! Can't comment on the Prisma Shark helmet but I have a Shark S500 which has served me well!

    Yes, SV's are starter valves and it's really worthwhile having them synchronized. If your local bike tech doesn't know what it's all about, check out the extensive thread on www.bikersoracle.com

    All the correct settings are there and seeing that it is an incorrect factory setting you can convince your tech to do the sync as a warranty item. I did! My bike was a lot smoother after I had them done.

    I also discovered some pics on how to gut the cat. Check this out! It's not as easy as some guys say it is!

    http://www.vfrdiscussion.com/forum/index.php?showtopic=30599&st=0
     
    Last edited: Mar 27, 2007
  14. Def-E-nition

    Def-E-nition New Member

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    I stole the Prisma for R1600 .........
    Checked out the starter valve thingie . Doesnt look easy . I dont want to tamper with the motor ...
    Im not so sure that the Local Honda boys are going to KNOW how to do this in any case ... you know what i mean,

    Those cat pics- FARrrk !! Hows that for restriction man . I reckon best way to do it , is the way those ics suggest - gut the f#^er from below , rip out the two bits and weld er up again . My word , Never knew what one looked like inside .
     
  15. aotto

    aotto New Member

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    There's no tampering with the motor. The SV sync also seemed complicated to me. However, I printed the thread and gave it to the tech at Honda. He had a look at it and was OK with it. Valves sound complicated but they're not true valves like most people know valves. All it really is, is a bunch of rubber hoses. If you can balance carbs you can sync SV's. The big problem the guys battled with in the thread is getting the correct settings. I'm sure your local Honda tech will be able to cope.

    Yeah, I also had the same reaction when I saw the pics showing the insides of the cat. Ugly looking thing!!! Judging from the pics, a screwdriver aint gonna do it 4 sure! As I'm not the best welder, I'll go the guys at my local exhaust franchise on Saturday to see if they're up to it.
     
  16. djock12

    djock12 New Member

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    I'm new to this forum, I have an 02 vfr with a PCIII, 2bros pipes and K&N Filter. I was wondering what exactly you block the pair valve with?
     
  17. aotto

    aotto New Member

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    Welcome!

    I simply used a plastic end plug commonly used to block water sprinkler hoses and garden hoses which I bought from my local hardware store. I disconnected main rubber hose at the left rear end of the air box (it’s the one leading to the solenoid at the back of the air box) pushed the end cap into the hose approx 2cm, clamped it with a hose clamp and pushed it back into it's original position.

    This way everything looks the way it did before (except for the extra clamp) with no dangling or loose hoses. A very simple exercise that took a grand total of 10 minutes!
     
  18. djock12

    djock12 New Member

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    thanks for the info
     
  19. djock12

    djock12 New Member

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    one more question, when you say the left end of the air box, are you looking at it from the front of the bike?
     
  20. Def-E-nition

    Def-E-nition New Member

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    nope. Sitting On the bike - nearest your Left leg sir .
    i used a bung plug that blocks up both ends , also struck it back on and Bobs your uncle .

    The bike is still new , so Im still trying to figure out what i shoud Or shouldnt be feeling now .
    Certainly though - anything that tampers with your bikes o2 sensor cannot be good at all .
     
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