WRX exhaust tone

blackhawke88 · Feb 24, 2011

PMK[OP] said: ↑

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
Click to expand...

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

chris4x4 · Feb 24, 2011

blackhawke88 said: ↑

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.
Click to expand...

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.

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.
Click to expand...

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

blackhawke88 · Feb 24, 2011

chris4x4 said: ↑

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...
Click to expand...

then how do you explain the exhaust note completely changing when a subie gets equal length headers, ceteris paribus?

chris4x4 · Feb 24, 2011

blackhawke88 said: ↑

then how do you explain the exhaust note completely changing when a subie gets equal length headers, ceteris paribus?
Click to expand...

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.

xodeuce · Feb 24, 2011

chris4x4 said: ↑

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...
Click to expand...

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.

PMK · Feb 24, 2011

chris4x4 said: ↑

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...
Click to expand...

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

blackhawke88 · Feb 24, 2011

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

MountainEarth · Feb 24, 2011

fap fap fap fap fap fap fap fap fap ahhhhh

chris4x4 · Feb 24, 2011

PMK[OP] said: ↑

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
Click to expand...

They can be whatever the manufacture wants them to be set at.

PMK · Feb 24, 2011

xodeuce said: ↑

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.
Click to expand...

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

chris4x4 · Feb 24, 2011

blackhawke88 said: ↑

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
Click to expand...

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:

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.
Click to expand...

blackhawke88 · Feb 24, 2011

chris4x4 said: ↑

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:
Click to expand...

http://www.youtube.com/watch?v=HoXkm8i-S4I

chris4x4 · Feb 24, 2011

blackhawke88 said: ↑

http://www.youtube.com/watch?v=HoXkm8i-S4I
Click to expand...

Interesting.

unentered · Feb 24, 2011

PMK[OP] said: ↑

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.
Click to expand...

What Volkswagen has a horizontally opposed boxer 4?

06rubi · Feb 24, 2011

I say if you want a WRX sound, get a WRX! Here is my STi next to my wifes Tacoma.

Blacktacoma23 · Feb 24, 2011

06rubi said: ↑

I say if you want a WRX sound, get a WRX! Here is my STi next to my wifes Tacoma.

Click to expand...

Now I kinda miss my STI

TexasTacoma37 · Feb 24, 2011

Blacktacoma23 said: ↑

Now I kinda miss my STI
Click to expand...

Me too....

Blacktacoma23 · Feb 24, 2011

KPT said: ↑

Me too....

Click to expand...

Mine:

blackhawke88 · Feb 24, 2011

mine!

joerussell610 · Feb 24, 2011

Being the service mgr for a subaru/vw store use the Subaru web site. Subaru.com this will explain everything to everyone about the Subaru and check out the great vids

Log in or Sign up

Welcome to Tacoma World!

WRX exhaust tone

#21
blackhawke88 wo ai ni bao bei ^_^

#22
chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#23
blackhawke88 wo ai ni bao bei ^_^

#24
chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#25
xodeuce mmmmmmbourbon.

#26
PMK [OP] Well-Known Member

#27
blackhawke88 wo ai ni bao bei ^_^

#28
MountainEarth Well-Known Member

#29
chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#30
PMK [OP] Well-Known Member

#31
chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#32
blackhawke88 wo ai ni bao bei ^_^

#33
chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#34
unentered Son of Baconator

#35
06rubi Well-Known Member

#36
Blacktacoma23 If your tires don't rub you can fit bigger tires

#37
TexasTacoma37 Well-Known Member

#38
Blacktacoma23 If your tires don't rub you can fit bigger tires

#39
blackhawke88 wo ai ni bao bei ^_^

#40
joerussell610 When all else fails read the directions

Products Discussed in

Log in or Sign up

Useful Searches

Welcome to Tacoma World!

WRX exhaust tone

#21 blackhawke88 wo ai ni bao bei ^_^

#22 chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#23 blackhawke88 wo ai ni bao bei ^_^

#24 chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#25 xodeuce mmmmmmbourbon.

#26 PMK [OP] Well-Known Member

#27 blackhawke88 wo ai ni bao bei ^_^

#28 MountainEarth Well-Known Member

#29 chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#30 PMK [OP] Well-Known Member

#31 chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#32 blackhawke88 wo ai ni bao bei ^_^

#33 chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#34 unentered Son of Baconator

#35 06rubi Well-Known Member

#36 Blacktacoma23 If your tires don't rub you can fit bigger tires

#37 TexasTacoma37 Well-Known Member

#38 Blacktacoma23 If your tires don't rub you can fit bigger tires

#39 blackhawke88 wo ai ni bao bei ^_^

#40 joerussell610 When all else fails read the directions

Products Discussed in Entire Site Forum: 2nd Gen. Tacomas (2005-2015)

#21
blackhawke88 wo ai ni bao bei ^_^

#22
chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#23
blackhawke88 wo ai ni bao bei ^_^

#24
chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#25
xodeuce mmmmmmbourbon.

#26
PMK [OP] Well-Known Member

#27
blackhawke88 wo ai ni bao bei ^_^

#28
MountainEarth Well-Known Member

#29
chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#30
PMK [OP] Well-Known Member

#31
chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#32
blackhawke88 wo ai ni bao bei ^_^

#33
chris4x4 With sufficient thrust, pigs fly just fine. Moderator

#34
unentered Son of Baconator

#35
06rubi Well-Known Member

#36
Blacktacoma23 If your tires don't rub you can fit bigger tires

#37
TexasTacoma37 Well-Known Member

#38
Blacktacoma23 If your tires don't rub you can fit bigger tires

#39
blackhawke88 wo ai ni bao bei ^_^

#40
joerussell610 When all else fails read the directions

Products Discussed in