Hey guys,
I'm sure somebody's mentioned this before, but I just ran across this on
4x4help: http://www.4x4help.com/tech/horn.htm

There's a restrictor in the tube going from the air box to the throttle
body that you can pull out for a little better flow.

Here are pictures of the ones I pulled from my YJ 2.5L and my XJ 4.0L

http://i143.photobucket.com/albums/r...r/IMG_0336.jpg

http://i143.photobucket.com/albums/r...r/IMG_0337.jpg

 

The Merg wrote:
> Hey guys,
> I'm sure somebody's mentioned this before, but I just ran across this
> on 4x4help: http://www.4x4help.com/tech/horn.htm
>
> There's a restrictor in the tube going from the air box to the
> throttle body that you can pull out for a little better flow.
>
> Here are pictures of the ones I pulled from my YJ 2.5L and my XJ 4.0L
>
> http://i143.photobucket.com/albums/r...r/IMG_0336.jpg
>
> http://i143.photobucket.com/albums/r...r/IMG_0337.jpg

Your better off putting that back.

It's a venturi and designed to create the vacuum necessary to
evacuate the emissions canister. without that, the canister
will become saturated and die an early (and expensive) death.
A properly designed venturi doesn't restrict much and the
actual restriction is the air turbulence caused by the bellows.

There is no appreciable gains from removing the venturi.
(tested it myself)
You can get a tiny gain from a larger diameter air tube, but
the problem with venting the canister remains.

However, take careful measurements of your fuel economy
and see if there is a difference. If there was on my
ZJ (and I tested it over a year) I certainly couldn't
see it.


--
-- DougW -- 93 ZJ 4.0 http://revbeergoggles.com
HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
Banks Header - and BEER, in the fridge!

 

The Merg wrote:
> Hey guys,
> I'm sure somebody's mentioned this before, but I just ran across this
> on 4x4help: http://www.4x4help.com/tech/horn.htm
>
> There's a restrictor in the tube going from the air box to the
> throttle body that you can pull out for a little better flow.
>
> Here are pictures of the ones I pulled from my YJ 2.5L and my XJ 4.0L
>
> http://i143.photobucket.com/albums/r...r/IMG_0336.jpg
>
> http://i143.photobucket.com/albums/r...r/IMG_0337.jpg

Your better off putting that back.

It's a venturi and designed to create the vacuum necessary to
evacuate the emissions canister. without that, the canister
will become saturated and die an early (and expensive) death.
A properly designed venturi doesn't restrict much and the
actual restriction is the air turbulence caused by the bellows.

There is no appreciable gains from removing the venturi.
(tested it myself)
You can get a tiny gain from a larger diameter air tube, but
the problem with venting the canister remains.

However, take careful measurements of your fuel economy
and see if there is a difference. If there was on my
ZJ (and I tested it over a year) I certainly couldn't
see it.


--
-- DougW -- 93 ZJ 4.0 http://revbeergoggles.com
HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
Banks Header - and BEER, in the fridge!

 

The Merg wrote:
> Hey guys,
> I'm sure somebody's mentioned this before, but I just ran across this
> on 4x4help: http://www.4x4help.com/tech/horn.htm
>
> There's a restrictor in the tube going from the air box to the
> throttle body that you can pull out for a little better flow.
>
> Here are pictures of the ones I pulled from my YJ 2.5L and my XJ 4.0L
>
> http://i143.photobucket.com/albums/r...r/IMG_0336.jpg
>
> http://i143.photobucket.com/albums/r...r/IMG_0337.jpg

Your better off putting that back.

It's a venturi and designed to create the vacuum necessary to
evacuate the emissions canister. without that, the canister
will become saturated and die an early (and expensive) death.
A properly designed venturi doesn't restrict much and the
actual restriction is the air turbulence caused by the bellows.

There is no appreciable gains from removing the venturi.
(tested it myself)
You can get a tiny gain from a larger diameter air tube, but
the problem with venting the canister remains.

However, take careful measurements of your fuel economy
and see if there is a difference. If there was on my
ZJ (and I tested it over a year) I certainly couldn't
see it.


--
-- DougW -- 93 ZJ 4.0 http://revbeergoggles.com
HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
Banks Header - and BEER, in the fridge!

 

The Merg wrote:
> Hey guys,
> I'm sure somebody's mentioned this before, but I just ran across this
> on 4x4help: http://www.4x4help.com/tech/horn.htm
>
> There's a restrictor in the tube going from the air box to the
> throttle body that you can pull out for a little better flow.
>
> Here are pictures of the ones I pulled from my YJ 2.5L and my XJ 4.0L
>
> http://i143.photobucket.com/albums/r...r/IMG_0336.jpg
>
> http://i143.photobucket.com/albums/r...r/IMG_0337.jpg

Your better off putting that back.

It's a venturi and designed to create the vacuum necessary to
evacuate the emissions canister. without that, the canister
will become saturated and die an early (and expensive) death.
A properly designed venturi doesn't restrict much and the
actual restriction is the air turbulence caused by the bellows.

There is no appreciable gains from removing the venturi.
(tested it myself)
You can get a tiny gain from a larger diameter air tube, but
the problem with venting the canister remains.

However, take careful measurements of your fuel economy
and see if there is a difference. If there was on my
ZJ (and I tested it over a year) I certainly couldn't
see it.


--
-- DougW -- 93 ZJ 4.0 http://revbeergoggles.com
HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
Banks Header - and BEER, in the fridge!

 

Thanks, Doug. There was certainly no mention of that in the write-
up. I think I'll leave 'em out for a while to see if there's any
difference - if not, I'll put 'em back.
You didn't happen to do a write-up on your site, did you?


On Jan 31, 7:56 pm, "DougW" <post.repl...@invalid.address> wrote:
> The Merg wrote:
> > Hey guys,
> > I'm sure somebody's mentioned this before, but I just ran across this
> > on 4x4help: http://www.4x4help.com/tech/horn.htm
>
> > There's a restrictor in the tube going from the air box to the
> > throttle body that you can pull out for a little better flow.
>
> > Here are pictures of the ones I pulled from my YJ 2.5L and my XJ 4.0L
>
> >http://i143.photobucket.com/albums/r...r/IMG_0336.jpg
>
> >http://i143.photobucket.com/albums/r...r/IMG_0337.jpg
>
> Your better off putting that back.
>
> It's a venturi and designed to create the vacuum necessary to
> evacuate the emissions canister. without that, the canister
> will become saturated and die an early (and expensive) death.
> A properly designed venturi doesn't restrict much and the
> actual restriction is the air turbulence caused by the bellows.
>
> There is no appreciable gains from removing the venturi.
> (tested it myself)
> You can get a tiny gain from a larger diameter air tube, but
> the problem with venting the canister remains.
>
> However, take careful measurements of your fuel economy
> and see if there is a difference. If there was on my
> ZJ (and I tested it over a year) I certainly couldn't
> see it.
>
> --
> -- DougW -- 93 ZJ 4.0 http://revbeergoggles.com
> HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
> Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
> Banks Header - and BEER, in the fridge!

 

Thanks, Doug. There was certainly no mention of that in the write-
up. I think I'll leave 'em out for a while to see if there's any
difference - if not, I'll put 'em back.
You didn't happen to do a write-up on your site, did you?


On Jan 31, 7:56 pm, "DougW" <post.repl...@invalid.address> wrote:
> The Merg wrote:
> > Hey guys,
> > I'm sure somebody's mentioned this before, but I just ran across this
> > on 4x4help: http://www.4x4help.com/tech/horn.htm
>
> > There's a restrictor in the tube going from the air box to the
> > throttle body that you can pull out for a little better flow.
>
> > Here are pictures of the ones I pulled from my YJ 2.5L and my XJ 4.0L
>
> >http://i143.photobucket.com/albums/r...r/IMG_0336.jpg
>
> >http://i143.photobucket.com/albums/r...r/IMG_0337.jpg
>
> Your better off putting that back.
>
> It's a venturi and designed to create the vacuum necessary to
> evacuate the emissions canister. without that, the canister
> will become saturated and die an early (and expensive) death.
> A properly designed venturi doesn't restrict much and the
> actual restriction is the air turbulence caused by the bellows.
>
> There is no appreciable gains from removing the venturi.
> (tested it myself)
> You can get a tiny gain from a larger diameter air tube, but
> the problem with venting the canister remains.
>
> However, take careful measurements of your fuel economy
> and see if there is a difference. If there was on my
> ZJ (and I tested it over a year) I certainly couldn't
> see it.
>
> --
> -- DougW -- 93 ZJ 4.0 http://revbeergoggles.com
> HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
> Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
> Banks Header - and BEER, in the fridge!

 

Thanks, Doug. There was certainly no mention of that in the write-
up. I think I'll leave 'em out for a while to see if there's any
difference - if not, I'll put 'em back.
You didn't happen to do a write-up on your site, did you?


On Jan 31, 7:56 pm, "DougW" <post.repl...@invalid.address> wrote:
> The Merg wrote:
> > Hey guys,
> > I'm sure somebody's mentioned this before, but I just ran across this
> > on 4x4help: http://www.4x4help.com/tech/horn.htm
>
> > There's a restrictor in the tube going from the air box to the
> > throttle body that you can pull out for a little better flow.
>
> > Here are pictures of the ones I pulled from my YJ 2.5L and my XJ 4.0L
>
> >http://i143.photobucket.com/albums/r...r/IMG_0336.jpg
>
> >http://i143.photobucket.com/albums/r...r/IMG_0337.jpg
>
> Your better off putting that back.
>
> It's a venturi and designed to create the vacuum necessary to
> evacuate the emissions canister. without that, the canister
> will become saturated and die an early (and expensive) death.
> A properly designed venturi doesn't restrict much and the
> actual restriction is the air turbulence caused by the bellows.
>
> There is no appreciable gains from removing the venturi.
> (tested it myself)
> You can get a tiny gain from a larger diameter air tube, but
> the problem with venting the canister remains.
>
> However, take careful measurements of your fuel economy
> and see if there is a difference. If there was on my
> ZJ (and I tested it over a year) I certainly couldn't
> see it.
>
> --
> -- DougW -- 93 ZJ 4.0 http://revbeergoggles.com
> HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
> Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
> Banks Header - and BEER, in the fridge!

 

Thanks, Doug. There was certainly no mention of that in the write-
up. I think I'll leave 'em out for a while to see if there's any
difference - if not, I'll put 'em back.
You didn't happen to do a write-up on your site, did you?


On Jan 31, 7:56 pm, "DougW" <post.repl...@invalid.address> wrote:
> The Merg wrote:
> > Hey guys,
> > I'm sure somebody's mentioned this before, but I just ran across this
> > on 4x4help: http://www.4x4help.com/tech/horn.htm
>
> > There's a restrictor in the tube going from the air box to the
> > throttle body that you can pull out for a little better flow.
>
> > Here are pictures of the ones I pulled from my YJ 2.5L and my XJ 4.0L
>
> >http://i143.photobucket.com/albums/r...r/IMG_0336.jpg
>
> >http://i143.photobucket.com/albums/r...r/IMG_0337.jpg
>
> Your better off putting that back.
>
> It's a venturi and designed to create the vacuum necessary to
> evacuate the emissions canister. without that, the canister
> will become saturated and die an early (and expensive) death.
> A properly designed venturi doesn't restrict much and the
> actual restriction is the air turbulence caused by the bellows.
>
> There is no appreciable gains from removing the venturi.
> (tested it myself)
> You can get a tiny gain from a larger diameter air tube, but
> the problem with venting the canister remains.
>
> However, take careful measurements of your fuel economy
> and see if there is a difference. If there was on my
> ZJ (and I tested it over a year) I certainly couldn't
> see it.
>
> --
> -- DougW -- 93 ZJ 4.0 http://revbeergoggles.com
> HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
> Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
> Banks Header - and BEER, in the fridge!

 

The Merg wrote:
> Thanks, Doug. There was certainly no mention of that in the write-
> up. I think I'll leave 'em out for a while to see if there's any
> difference - if not, I'll put 'em back.
> You didn't happen to do a write-up on your site, did you?

Long time back. Don't know if it's still in my collection.
Nope, that was back when I was on a different ISP. Basically
I track my milage every fillup (got a excel ------sheet to do it)
over about a year I didn't see any difference, and my 1/4 mile
and 0-60 times didn't change by anything I could detect.

The only thing I did notice was more of a gas smell from the
engine. Turned out that was the evaporative canister maxing out.
Soon after I put the venturi back and the smell slowly went away.

Later I put in the supercharger and didn't even think about it
again till your post.

--
DougW