poll regarding sound tube delete

[dnieves]

Too bad there isn't a fifth option:


Who noticed enough to care either way?

[Packofcrows]

I just installed a TRD intake, then unhooked sound tube piece halfway and the rest left on the firewall. Just zip tied the remaining to stock brace/strut and plugged. Plugged from the outside.

Originally Posted by Davegixxer

Hey guys, sorry to revive such an old thread, but I actually use the search function and couldn't find exactly what I was looking for, so I figured I would post a question. I am interested in deleting the sound tube entirely, plugging the hole in the firewall, and getting a new intake elbow that does not have the extra hole for the sound tube nonsense. Has anyone actually verified any difference in idle or air/fuel mixture now that there is more air available for the engine now that the tube is deleted? The last thing I would want to do is require a tune just because of deleting it. Maybe I'm thinking too far into it, but from the reading that I've done, our engines are rather picky. More air without more fuel and running lean could have long term effects?

So here's my story. My friend's and I had issues with the stock air intake. We'd stall easily and shifting 1-3rd was felt too much. My friends include me driving manual for say 5 solid years, my father for 20years, 2 friends who have been for 2yrs and so on.

We all noticed it so we test drove 2-3 other's to check and sure thing, there it was. We easily stalled.

Almost a year later (now) with the TRD intake (sound tube deleted) I never stall. My father argues there was a leak somewhere on the sound tube. I'm not sure about that. Car drives better, mpg in town is 2mpg less and in hwy 2 more. Maybe that is just me.

p.s. the only tune you need is to unplug battery for 5min and let car idle for a good 5min by itself. You'll notice the car adjusting for about 200miles. I noticed it for 500...

[Tcoat]

Originally Posted by Davegixxer

Hey guys, sorry to revive such an old thread, but I actually use the search function and couldn't find exactly what I was looking for, so I figured I would post a question. I am interested in deleting the sound tube entirely, plugging the hole in the firewall, and getting a new intake elbow that does not have the extra hole for the sound tube nonsense. Has anyone actually verified any difference in idle or air/fuel mixture now that there is more air available for the engine now that the tube is deleted? The last thing I would want to do is require a tune just because of deleting it. Maybe I'm thinking too far into it, but from the reading that I've done, our engines are rather picky. More air without more fuel and running lean could have long term effects?

There are loads of threads on it but they can be hard to find. Pull it off and plug the hole and all is good. There was zero impact on any system reported by doing this. The tube really didn't divert enough air to make any difference at all.

[Packofcrows]

Originally Posted by Tcoat

There are loads of threads on it but they can be hard to find. Pull it off and plug the hole and all is good. There was zero impact on any system reported by doing this. The tube really didn't divert enough air to make any difference at all.

Early on 2012 threads or so, weren't they saying that by deleting the tube you lose up to 2 hp? I'll try to find the threads.

edit: reading on it says it may be within margin of dyno error, but various people mentioned the -2hp. Hmmm... Closest dyno 1hr+ away.

[Tcoat]

Originally Posted by Packofcrows

Early on 2012 threads or so, weren't they saying that by deleting the tube you lose up to 2 hp? I'll try to find the threads.

There is no hp loss at all. The sound tube is just that a sound tube.
How can they even think they can measure a 2 hp loss anyway? That is well within the "noise" range of any dyno made.

[Ultramaroon]

It's a kazoo in every sense. Unless the diaphragm is torn or cracked (I don't know what it's made of) there is no air flowing through it.

[Packofcrows]

Originally Posted by Ultramaroon

It's a kazoo in every sense. Unless the diaphragm is torn or cracked (I don't know what it's made of) there is no air flowing through it.

Up to here, there is air flowing through it.




Once it hits the damper(?), then its just sound resonating all the way through to the cabin.


(Pic is from WRX forums, but same parts for most cars. Our Rav4 has it too!)

Found this from Porsche friend over Skype.

[FR-Sky]

the sound of the boxer engine..feels like the car is roaring !!!
i like it. period.

[Tcoat]

Originally Posted by Packofcrows

Up to here, there is air flowing through it.




Once it hits the damper(?), then its just sound resonating all the way through to the cabin.


(Pic is from WRX forums, but same parts for most cars. Our Rav4 has it too!)

Found this from Porsche friend over Skype.

I think you are picturing what happens backwards there Pack. The sucking engine is sucking air in the intake is not pushing it. The air rushing past the branch of the sound generator creates the noise. There is no air entering the generator really. Can't find the thread but there were a couple of guys that tried to plug the hole in the side of the intake with smooth walled fittings and they got sucked right in (the plugs not the guys). The sound tube does not give, nor take air in any way shape or form.


http://www.ft86club.com/forums/showthread.php?t=7975

[Tcoat]

Originally Posted by FR-Sky

the sound of the boxer engine..feels like the car is roaring !!!
i like it. period.

But FR it isn't the sound of the boxer engine. It is an artificially created noise caused by a tube and diaphragm. It has nothing to do with a boxer engine.

[Braces]

If plugging the hole subtracts 2hp. What if you attached a small electric compressor directly to the sound tube? Poor man's turbo?

[Gringosteve]

I modded mine to remove the foam and baffles for more howl

[soulreapersteve]

Originally Posted by Ultramaroon

It's a kazoo in every sense. Unless the diaphragm is torn or cracked (I don't know what it's made of) there is no air flowing through it.

It did sound like a wailing banshee blowing into a kazoo.

[Tcoat]

Originally Posted by Braces

If plugging the hole subtracts 2hp. What if you attached a small electric compressor directly to the sound tube? Poor man's turbo?