Author Topic: P.A.I.R. How does it work. (Read 5739 times)

DaveG · « **on:** August 02, 2007, 11:23:19 AM »

thought i would disable the pair system by plugging the small vacuum hose to it.

now i am getting increased popping and backfiring through the exhaust.

would it be better to plug the air supply hose?

did i make the pair full time by plugging the vacuum?
I thought that it would only supply air to the exhaust under high vacuum conditions. but maybe it's the other way round.

ZenMan · « **Reply #1 on:** August 02, 2007, 11:52:44 AM »

Plug the air supply hose, not the vacuum hose.

Manifold vacuum actually drops when you open the throttle, since it is created by the throttle plate restriction. It is the difference between atmospheric pressure and manifold pressure.

Venturi vacuum increases when you accelerate. Depending on whether your particuler air injection system is actuated by manifold vacuum or venturi vacuum determines when air is injected into the cycle.

I'm not familiar with the details on the PAIR system, but most injection systems serve the same purpose... burning excess hydrocarbons to reduce emissions.

Did you get the EFI trouble light with the vacuum hose plugged?

txbanditrydr · « **Reply #2 on:** August 02, 2007, 12:14:30 PM »

There is a good write up in the FAQ's you can access by CLICKING HERE..... Unfortunately the pics are gone but the text should be self-explanatory

Red01 · « **Reply #3 on:** August 02, 2007, 02:50:04 PM »

I can understand why someone might want to remove it (K&N pods, easier maintenance, and/or a little less weight), but I don't understand why one would want to just disable it. It doesn't help or hurt performance, it only effects emissions.

DaveG · « **Reply #4 on:** August 02, 2007, 02:54:11 PM »

ok we are talking 2002 B12S here
no EFI

so my real question is did I plug the Manifold vacuum or the vernturi vacuum?

tracing the hose it seems to be on a t-fitting connected to the #4 carb. it also supplies vacuum to the fuel petcock.
my guess would be that it is venturi vacuum.

I will unplug it and plug the air supply.
wasn't that some 70's/80's hair band???

DaveG · « **Reply #5 on:** August 02, 2007, 02:59:44 PM »

it pumps air into the exhaust causing unburned mixture to combust.
it reduces unburned hydrocarbon emissions but with aftermarket can you can hear the combusting results in popping and backfiring.

i would rather not have that.

I plan on removing the pair later but for now just want to disable it.

Red01 · « **Reply #6 on:** August 02, 2007, 03:09:55 PM »

With no PAIR you will still get some popping on decel with an aftermarket exhaust.

DaveG · « **Reply #7 on:** August 02, 2007, 03:26:53 PM »

some yes

hoping for less though.

ZenMan · « **Reply #8 on:** August 02, 2007, 05:06:27 PM »

Manifold vacuum is between the throtle plate and the head, venturi vacuum is between the throttle plate and the choke, basically... or in the carb "throat".

Most vacuum-operated devices use manifold vacuum. it really doesn't matter in this case, because you only need to plug the big hose from the air box that supplies air to the valve.

DaveG · « **Reply #9 on:** August 03, 2007, 12:05:04 PM »

plugged the right hose = no more popping NONE

BUT i have been turning out the mixture screws to try and fix it and am now too rich.

will turn them in 1/2 turn per day until i hear a little popping and then will be just right.

THANKS

Rocketjock · « **Reply #10 on:** November 15, 2007, 10:20:19 PM »

Doesn't the stock can have a catylitic converter? So if you are still running the stock can you would want to feed all the fresh air you can to it to have it burn off all those nasty unburnt gasses. Thus, the PAIRS system.

rkfire · « **Reply #11 on:** November 16, 2007, 12:44:26 AM »

Quote from: Rocketjock on November 15, 2007, 10:20:19 PM

Doesn't the stock can have a catylitic converter?

Not 06's or earlier.

PaulVS · « **Reply #12 on:** November 16, 2007, 09:54:43 AM »

Here's a picture of the Holeshot PAIR removal plates on my '03...

Rocketjock · « **Reply #13 on:** November 16, 2007, 10:16:06 AM »

Well, Ny 06 does, Bud.

rkfire · « **Reply #14 on:** November 16, 2007, 11:20:40 AM »

That's odd, I've read 4 or 5 reviews of the 06 and not one mentioned the addition of a cat. Where exactly did you read that it has one?

Author Topic: P.A.I.R. How does it work. (Read 5739 times)

DaveG

P.A.I.R. How does it work.

ZenMan

P.A.I.R. How does it work.

txbanditrydr

P.A.I.R. How does it work.

Red01

P.A.I.R. How does it work.

DaveG

P.A.I.R. How does it work.

DaveG

P.A.I.R. How does it work.

Red01

P.A.I.R. How does it work.

DaveG

P.A.I.R. How does it work.

ZenMan

P.A.I.R. How does it work.

DaveG

P.A.I.R. How does it work.

Rocketjock

Re: P.A.I.R. How does it work.

rkfire

Re: P.A.I.R. How does it work.

PaulVS

Re: P.A.I.R. How does it work.

Rocketjock

Re: P.A.I.R. How does it work.

rkfire

Re: P.A.I.R. How does it work.