can you disable PAIRs by simply unplugging the connector

Discussion in '5th Generation 1998-2001' started by Ultrasonic2, Feb 7, 2012.

  1. Ultrasonic2

    Ultrasonic2 New Member

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    can you disable PAIRs so it wont suck from the air box by simply unplugging the connector going to it ?

    some say yes others say no ?
     
  2. Metallican525

    Metallican525 New Member

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    This is sort of a loaded question. You can disable the operation of the PAIR valve itself by just unplugging it, but the PAIR system will still have some effect until it is fully removed and blocked off. I disabled mine this way when I installed my PCIII until I got my blockoff plates installed. The only difference I could notice is that you will still get lots of popping through the exhaust on decel until you fully remove and block off the PAIR system.
     
  3. VFRBenny

    VFRBenny New Member

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    From what I've read, the Pair system is active while unpluged (as in always on). But if you fill the Air box hole with hot glue, it will disable the pair system.
     
  4. Ultrasonic2

    Ultrasonic2 New Member

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    yeah so i dont know there are guides saying all you have to do is unplug it but then people like yourself say that will make it run all the time instead of none of the time

    well i unplugged it last night and i noticed no improvement in fuelling anywhere. However it seems to have had a REALLY bad effect on exhaust temps. i'll get my temp gun out tonight and see how hot it is now.

    To me it seems that disabling the PAIRs would result in hotter exhaust temps. yes i know that allowing the air in will allow unburnt fuel to now get burnt but from the air fuel ratio's i've seen it's letting in FAR more air than is being burnt ( air fuel ratios off the scale when sensed from the exhaust ) and therefore ultimately resulting in cooler running.

    im wondering if alot of these people having to take extra lengths to cool their bikes is because they made them hotter by removing the pairs
     
  5. MiddleTBabb

    MiddleTBabb New Member

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    The system has been disabled and blocked off for two years and 10k miles on my 2007. I haven't seen any problems with engine performance or temperature

    Good luck
     
  6. Ultrasonic2

    Ultrasonic2 New Member

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    Yeah i mean temp issues would greatly be affected by your ambient air temp AND of course how you ride it. I commute on it so therefore im going very slowly if at all most of the time. so it will get FAR hotter than the guy that goes for a thrash or a long ride.

    anyway we dont seem to know if by removing the plug it has made it stay on or off so there wont be any solid conclusions made anyway

    ho and in an hour i'll know if it's hotter or colder for sure when i get home
     
  7. VFRBenny

    VFRBenny New Member

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    This is in my shop manual. Try reading one.
     

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  8. Ultrasonic2

    Ultrasonic2 New Member

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    cool will figure that out later.

    Yesterday with 24c ambient ex temp 250c

    Today with it disconnected 27c ex temp 290c

    will do more testing
     
  9. Ultrasonic2

    Ultrasonic2 New Member

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    Right so that answers it then. With no power no air will flow to the air box and therefore pairs is disabled
     
  10. VFRBenny

    VFRBenny New Member

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    Looks more like no air flow with power. At least thats how I read it.


     
  11. Ultrasonic2

    Ultrasonic2 New Member

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    SO you are right which makes alot of people very wrong. Which makes me think alot of people must be experiencing the placebo effect

    pairs.jpg
     
  12. CharlesW

    CharlesW New Member

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    Just remove the air hose from the air box to the solenoid valve and plug it.
    If you just want to try it to see if it makes any difference, put some plastic electrical tape over the nipple on the air box and replace the hose.
    If you think it makes a difference, buy a rubber plug at the hardware store that will fit in the nipple and replace the tape with that.
    I found a tapered plug that fit into the nipple outlet and the larger end fit the inside diameter of the hose. Put the plug in the nipple, put a piece of electrical tape over it for insurance and replaced the hose. 14,000 miles later, no ill effects.
    In my case, I felt it improved things. Not everyone agrees on this so trying it yourself is the only way to be sure.
    This was on a 6th Gen (2004) and I don't know if all generations will be the same.
     
  13. Ultrasonic2

    Ultrasonic2 New Member

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    oh the comment about the placebo was for people that just unpluged it and thought they have prevented the air from flowing. I wasn't referening to the people that blocked it or removed it completely.

    anyway last night i plugged it back in as there seems little point leaving it unplugged
     
  14. Metallican525

    Metallican525 New Member

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    Well, that explains a lot, guess I should have read the damn manual huh!!!!!!!!!!!!!
     
  15. CharlesW

    CharlesW New Member

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    It probably also helps explain some of the different results from disabling the PAIR valves.
    Those that read about and then disconnected the solenoid wouldn't get the same results as those that blocked off the inlet hose from the airbox.
    I did the hose block off first and later disconnected the solenoid thinking it would be some insurance against any possible leakage from the hose block off.
    Evidently the solenoid disconnection was a waste of time.

    Gee, kind of disappointing to find that you can't believe everything you read on the internet.:shocked:
     
  16. Ultrasonic2

    Ultrasonic2 New Member

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    man i should have thought about reading the manual from the start LOL

    so with it plugged back in ambient 27 ex temp 260c

    on a side note im so happy i put that exhaust wrap on
     
  17. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    just leave the shit alone. You're on a '99 with no O2 sensors.
     
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  18. Ultrasonic2

    Ultrasonic2 New Member

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    Your probably right im just obsessed with how hot i get when riding this bike
     
  19. Motographer

    Motographer New Member

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    tinkerin, does disabling the PAIR have less of an effect on the 98-99's? I'm thinking about taking the whole thing off to try and get a little more fuel economy, but if it won't have much of a benefit, I'd rather not go tearing into things.
     
  20. tinkerinWstuff

    tinkerinWstuff Administrator Staff Member

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    All the system does is allow fresh filtered air from the airbox into the exhaust pipes. Thus there is oxygen available to burn off excess 'crap'. If you look at it and think about the system for a minute, you realize there's no way that the PAIR system can have any affect on fueling, performance, or economy.

    After the 2000 model where Honda installed O2 sensors to monitor oxygen in the exhaust system and act like a closed loop FI system - there's some debate that the PAIR system has some effect on performance. On a bike that is operating properly without any other issues, I'm not sure that I buy that but do not have experience with those bikes or any evidence to argue.

    The PAIR system has to be disabled to DYNO a bike or you won't get accurate air/fuel ratio readings at idle. Just off idle, the PAIR closes and accurate readings appear for cruising RPM and WOT.

    I've done HP runs on the DYNO with both PAIR active and blocked off, 1990 VFR750, and showed ZERO change in Torque and HP.
     
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