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De cone a TS airbox?

As above , what does de coning an airbox from a TS actually do if anything?
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Re: De cone a TS airbox?

It removes the restictive vunturi from the airbox, releasing a little more induction noise, tough it imbalances the airflow through the filter housing.
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Re: De cone a TS airbox?

It made mine run worse so i put it back.

I think the extra noise convinces some people that the engine is making more power. I've yet to see dyno figures to back up any power gain claims.
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Re: De cone a TS airbox?

Some will say "yes it does seem faster" but there is a reason that it is there. As Smaky has already said but....It also prevents the standard air filter from mis-shaping during full load which will cause restriction at higher speeds now thats something many owners who have tried it haven't noticed as it springs back into shape.
But if you dont believe it, try attaching the filter without the outer box and watch the little bugger twist!
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Re: De cone a TS airbox?

It made my 156 slower as well.

Even thought the neck of the cone is narrower than the pipe the entrance is shaped to prevent a Boundary layer of still air forming which is a restriction.

The intake is therfore actually less restrictive than with it removed.

Also the cone shape reflects inlet pulses back down to the intake which assists in filling the cylinders.

The reason for the variable inlet manifold is so that the engine can take advantage of this at lower RPM.
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Re: De cone a TS airbox?

Smaky is right, without the cone the air going through the MAF is
turbulent and will give false readings to the injection system. The MAF needs a smooth airflow to function properly.
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Re: De cone a TS airbox?

I found that the cone in my 156s airbox helped the car to run smoothly at lower engine speeds, taking it out did cause hesitancy in traffic. However, on the open road, removing the cone caused more intake roar and better midrange and top end response. It felt quicker to pick up.
I found that it could be removed or replaced in about 1 minute, so I tended to take it out when I was on holiday, and put it back in when I went back to work!
All you need to do it loosen the jubilee clip around the connector between the rubber air hose, disconnect and move the hose to one side,then pull the cone straight up and out of the housing.

Easy peesy!
 
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Re: De cone a TS airbox?

Thanks RB, turbulent was the word I was looking for earlier, but I was so wound up by another forum member who hasn't replied to this thread yet that I couldn't think of it.

What I didn't mention was that cars with it missing tend to have lumpy idle problems and bad fuel economy.
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Re: De cone a TS airbox?

Quote:
Originally Posted by Smaky View Post
Thanks RB, turbulent was the word I was looking for earlier, but I was so wound up by another forum member who hasn't replied to this thread yet that I couldn't think of it.

What I didn't mention was that cars with it missing tend to have lumpy idle problems and bad fuel economy.

Assuming you we referring to me, I'm HERE HUN

Again you are WRONG!!!!

My car doesn't have a cone in its airbox, & afaik neithers does David C's.

My car idle is perfect, my car does anything from 30mpg to 38 mpg depending on my driving habits
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Re: De cone a TS airbox?

Where does the cone sit again? I got my car serviced a few days ago and I told them leave the airfilter alone because I replaced it myself a few months ago. I cant remember where the cone sits is it inside the box or does it go a bit into the air piping going into the box? I have a feeling they never replaced it as it is definitely louder since I got it back.
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Re: De cone a TS airbox?

if you remove the pipe off the top of the air box it should be just popped down into the air filter.
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Re: De cone a TS airbox?

I think they bloody didnt replace it. Popping down from the pipe into the airbox is it?
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Re: De cone a TS airbox?

should be.

if you need one i have a spare.
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Re: De cone a TS airbox?

Ya ill double check tomorrow, will you keep that one for me plese pat. thanks
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Re: De cone a TS airbox?

consider it kept
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Hi there

Does anyone know if my 1999 V6 should have a cone in the airbox? I've read lots about them but my airbox doesn't have one.

Thanks
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Quote:
Originally Posted by perksy View Post
Hi there

Does anyone know if my 1999 V6 should have a cone in the airbox? I've read lots about them but my airbox doesn't have one.

Thanks
No it shouldn't.
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Cone inside airfillter

Hi guys,
i am the new owner of 156 2.0TS and have just replaced the air filter. Which way up should the cone go? also does it just sit inside the filter element without being secured?
thanks
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It goes in with the widest end at the top.

It just sits unsecured inside. it cannot go too far once the top is back on.
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Air Filter Cone

Thanks Symon. Just to be clear.. do you mean the flared end (trumpet like)? or the wider end (tube). sketch attached. cheers Steve
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File Type: pdf img-426105417-0001.pdf (66.1 KB, 78 views)
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tube end at the top mate
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Many older cars of the 60s, 70s, etc, had an air cleaner on top of the carburetor. The inlet tube to the filter box was a cone shape on a number of vehicle types. This probably did a similar job to the cone in the 156 air cleaner box, although there was no variable inlet manifold system as far as I am aware.
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Quote:
Originally Posted by Ronny v6 View Post
Some will say "yes it does seem faster" but there is a reason that it is there. As Smaky has already said but....It also prevents the standard air filter from mis-shaping during full load which will cause restriction at higher speeds now thats something many owners who have tried it haven't noticed as it springs back into shape.
But if you dont believe it, try attaching the filter without the outer box and watch the little bugger twist!
Worse than that -if you remove the cone from the air filter it has no support or seal - it becomes redundant as the air will just rush around your car you will be running on dirty air...
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Quote:
Originally Posted by Blackspider61 View Post
Worse than that -if you remove the cone from the air filter it has no support or seal - it becomes redundant as the air will just rush around your car you will be running on dirty air...
The cone does not seal the airbox or filter.
With the lid fully shut it is possible for the cone to work loose and drop to the bottom of the airbox.

So removing the cone from a 156 airbox does not result in dirty air entering the engine.

(PS well done for bumping a 7-year old thread!)
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Quote:
Originally Posted by David C View Post
The cone does not seal the airbox or filter.
With the lid fully shut it is possible for the cone to work loose and drop to the bottom of the airbox.

So removing the cone from a 156 airbox does not result in dirty air entering the engine.

(PS well done for bumping a 7-year old thread!)
Talking in GTV/Spider ...maybe different for 156.
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