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Old 02-24-2011, 02:01 PM   #21
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Quote:
Originally Posted by whippersnapper02 View Post
Some guy wanted his Taco to sound like a 350Z so we all gave him crap. One of the guys decided to be funny and make a similar thread but with a Veyron exhaust question.
haha! wow.
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Old 02-24-2011, 02:05 PM   #22
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Originally Posted by joerussell610 View Post
probably just disconnect a couple of spark plugs because those things sound like they are only running on a couple of cylinders.
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Old 02-24-2011, 02:10 PM   #23
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like someone said before, the 'boxer' engine sound isnt because it is a boxer engine, its because they have unequal length headers. When Subie owners really want power, they swap in equal length headers in which case the subie sounds like any regular 4banger. Scion tCs have aftermarket unequal length headers available which makes them sound like subies.
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Old 02-24-2011, 02:10 PM   #24
What is this "search" you speak of?
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Quote:
Originally Posted by PMK View Post
Cowboy what's your problem?

Not as if I came here slamming your truck, you or the wedding photos you posted with your truck build.

Anyone with some decent info, even if wrong but worth looking at, let's hear what you have to say.

Thanks
PK
Sheeeeeeesh kicking a guy in the dick cause he posted his wedding pics in his build thread? Harsh PK!!!

Its not just a build thread to some people. Some people consider it their "everything" thread. So why not put whatever you want in it?
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Old 02-24-2011, 02:11 PM   #25
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Quote:
Originally Posted by AzogSS View Post
Yeah short pipes and a Turbo make them sing... this thread reminds me of the guy on here that wanted the Bugatti exhaust note.
So short pipes in overall length or short pipe after the muffler.

While a Bugatti tone would be nice, it's ok it will never have it.

Again I'm asking not for some huge power gain or wanna be supercar sound.

Maybe it's just not worth doing, but it is worth asking.

PK
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Old 02-24-2011, 02:13 PM   #26
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Quote:
Originally Posted by PMK View Post
So short pipes in overall length or short pipe after the muffler.

While a Bugatti tone would be nice, it's ok it will never have it.

Again I'm asking not for some huge power gain or wanna be supercar sound.

Maybe it's just not worth doing, but it is worth asking.

PK
you can do it, just keep one side headers stock, then have the otherside wrap around itself a few times, then connect them to y-pipe....bam! Unequal length headers
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Old 02-24-2011, 02:22 PM   #27
With sufficient thrust, pigs fly just fine.
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Quote:
Originally Posted by blackhawke88 View Post
like someone said before, the 'boxer' engine sound isnt because it is a boxer engine, its because they have unequal length headers. When Subie owners really want power, they swap in equal length headers in which case the subie sounds like any regular 4banger. Scion tCs have aftermarket unequal length headers available which makes them sound like subies.
Nope.

Engine sound is dertermined (aside from muffler, which just changes the tone) by the timing in which that piston is timed on the crankshaft. Take Harley for example. There are tonnes of V twins on the road, but only Harley has its sound.
Quote:
A piston fires.
The next piston fires at 315 degrees.
There is a 405-degree gap.
A piston fires.
The next piston fires at 315 degrees.
There is a 405-degree gap.
Some vehicles are evenly timed, others are staggered in a way to give a certain sound...
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Old 02-24-2011, 02:25 PM   #28
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Quote:
Originally Posted by chris4x4 View Post
Nope.

Engine sound is dertermined (aside from muffler, which just changes the tone) by the timing in which that piston is timed on the crankshaft. Take Harley for example. There are tonnes of V twins on the road, but only Harley has its sound.

Some vehicles are evenly timed, others are staggered in a way to give a certain sound...
then how do you explain the exhaust note completely changing when a subie gets equal length headers, ceteris paribus?
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Old 02-24-2011, 02:27 PM   #29
With sufficient thrust, pigs fly just fine.
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Quote:
Originally Posted by blackhawke88 View Post
then how do you explain the exhaust note completely changing when a subie gets equal length headers, ceteris paribus?
Ive never heard of anything like that. The exhaust length doesnt affect the timming of the pistons, or fireing sequence. It may change the tone, but the sound pulles will be the same.
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Old 02-24-2011, 02:27 PM   #30
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Quote:
Originally Posted by chris4x4 View Post
Nope.

Engine sound is dertermined (aside from muffler, which just changes the tone) by the timing in which that piston is timed on the crankshaft. Take Harley for example. There are tonnes of V twins on the road, but only Harley has its sound.

Some vehicles are evenly timed, others are staggered in a way to give a certain sound...
Chris FTW.

Another excellent example of this is Yamaha's new firing order and timing in their inline 4 cylinder liter bike. They changed the cylinder firing order, ignition, and valve timing. The displacement didn't change appreciably, nor did the cylinder configuration, or really the exhaust setup. However, it sounds like a totally different motorcycle. The cam's lift and duration has a fairly significant effect on an engine's exhaust note as well.
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Old 02-24-2011, 02:29 PM   #31
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Quote:
Originally Posted by chris4x4 View Post
Nope.

Engine sound is dertermined (aside from muffler, which just changes the tone) by the timing in which that piston is timed on the crankshaft. Take Harley for example. There are tonnes of V twins on the road, but only Harley has its sound.

Some vehicles are evenly timed, others are staggered in a way to give a certain sound...

The WRX being flat should the crank journals 180° spaced (paired) or 90° (individual). I'm not sure which since I never owned or worked on a WRX.

Guessing the 4.0 liter Tacoma is 60°, but again don't know.

PK
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Old 02-24-2011, 02:31 PM   #32
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this link:
http://www.doudna.com/Subaru/

does cover what Chris said about timing, however, at the end it says if you have independent headers for each cylinder run equally together into the exhaust, it will sound like a regular inline four, hence, how equal length headers will change the sound of the engine
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Old 02-24-2011, 02:31 PM   #33
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Old 02-24-2011, 02:32 PM   #34
With sufficient thrust, pigs fly just fine.
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Quote:
Originally Posted by PMK View Post
The WRX being flat should the crank journals 180° spaced (paired) or 90° (individual). I'm not sure which since I never owned or worked on a WRX.

Guessing the 4.0 liter Tacoma is 60°, but again don't know.

PK
They can be whatever the manufacture wants them to be set at.
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Old 02-24-2011, 02:35 PM   #35
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Quote:
Originally Posted by xodeuce View Post
Chris FTW.

Another excellent example of this is Yamaha's new firing order and timing in their inline 4 cylinder liter bike. They changed the cylinder firing order, ignition, and valve timing. The displacement didn't change appreciably, nor did the cylinder configuration, or really the exhaust setup. However, it sounds like a totally different motorcycle. The cam's lift and duration has a fairly significant effect on an engine's exhaust note as well.
I agree, the exhaust timing and lift can make the tone change.

If they are still running a similar exhaust, which is stated, if it's a four into one then I doubt the tone would change much. Probably the exhaust timinig.

Haven't looked at the bike, but does it have some type of EXUP or function changing the exhaust effective length.

Also, being fuel injected, it seems now they are really playing with the ECU ignition portion, the fuel injection program and getting the bikes to work very well with none of the old carb issues.

PK
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Old 02-24-2011, 02:36 PM   #36
With sufficient thrust, pigs fly just fine.
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Quote:
Originally Posted by blackhawke88 View Post
this link:
http://www.doudna.com/Subaru/

does cover what Chris said about timing, however, at the end it says if you have independent headers for each cylinder run equally together into the exhaust, it will sound like a regular inline four, hence, how equal length headers will change the sound of the engine
They dont necessarilly change the sound, nor make them sound like an I4. Infact, doing so could have adverse performance impact on the engine. In the same link, This guy give some more detail:

Quote:
What I believe the poster failed to take into account is that exhaust pressure pulses are not instantaneous spikes, but rather have significant duration. Each pressure pulse must be at least as long as its respective exhaust valve is open, with the restriction of the muffler and tail pipe stretching out its decay. Within any exhaust pipe or manifold, each exhaust pulse begins, builds, peaks, and decays. Considering one manifold's [fire,fire,wait,wait]: the tail of the first "fire" pulse has much more opportunity to overlap with the beginning of the second "fire" pulse than the tail of the second does with the beginning of the first (due to the intervening wait,wait). To the degree the two fire pulses tend to overlap somewhat, they form a [ FIRE , WAIT ] pressure pattern in each manifold which is half the frequency... sometimes referred to as a "rumble" sound which is superimposed upon the normal fire,fire,fire,fire sound in common with an ordinary inline-4 engine.
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Old 02-24-2011, 02:40 PM   #37
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Quote:
Originally Posted by chris4x4 View Post
They dont necessarilly change the sound, nor make them sound like an I4. Infact, doing so could have adverse performance impact on the engine. In the same link, This guy give some more detail:
http://www.youtube.com/watch?v=HoXkm8i-S4I
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Old 02-24-2011, 02:42 PM   #38
With sufficient thrust, pigs fly just fine.
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Quote:
Originally Posted by blackhawke88 View Post
Interesting.
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Old 02-24-2011, 02:47 PM   #39
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Quote:
Originally Posted by PMK View Post
Yes a Subaru WRX, on the gas they have a very respectable exhaust tone. It may be the boxer type engine, but then again so isn't a VW and they don't sound close. Even an older Porsche is not the same.
What Volkswagen has a horizontally opposed boxer 4?
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Old 02-24-2011, 02:51 PM   #40
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I say if you want a WRX sound, get a WRX! Here is my STi next to my wifes Tacoma.
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