subaru rumble

[denkigrve]

Originally Posted by V1B

Wow this one sounds pretty damn good!!!

Is this one axle back or full system?
I realy want something nice deep and agresive sounding

SRT's is header-back:

http://www.ft86club.com/forums/showthread.php?t=9372

[Thunderchicken]

Originally Posted by V1B

just quick question. how can we achieve the subaru boxer engine sound?

straight pipe probably will not do it huh? need headers w/o the cats ?

The only way to get the Subaru Turbo rumble is to have unequal length headers.

FYI not go in this type of application, but it's great for single scroll turbo's.

[V1B]

Originally Posted by Thunderchicken

FYI not go in this type of application, but it's great for single scroll turbo's.

?

[Vracer111]

Originally Posted by V1B

just quick question. how can we achieve the subaru boxer engine sound?

straight pipe probably will not do it huh? need headers w/o the cats ?

Like this:

[ame="http://www.youtube.com/watch?v=WCI5Rf2bXsg"]TOYOTA　86＆SUBARU　BRZ　 AUTO FACTORY オリジナルエã‚*マニ ＆ Muffler　sound　FUJI - YouTube[/ame]

[ame="http://www.youtube.com/watch?v=d-xlg_HI4cA"]TOYOTA86＆SUBARU　BRZ　 AUTO FACTORY オリジナルエã‚*マニ＆Exhaust Muffler　　FUJI - YouTube[/ame]

http://www.ft86club.com/forums/showthread.php?t=5947

[Sportsguy83]

Originally Posted by V1B

just quick question. how can we achieve the subaru boxer engine sound?

straight pipe probably will not do it huh? need headers w/o the cats ?

Originally Posted by Spaceywilly

Equal length makes more HP. The only reason WRX uses UEL is because it is better packaging for the turbo. Here is a good video showing UEL sound vs. EL sound

AFAIK, the OP is asking for the "burble" Boxer sound. That has been best explained by Spacewilly's video (the first run when it says header is stock).

All other videos with BRZ exhaust has shown beautifull note and growl (especially Auto Factory!) but none will sound with the Boxer "Burble" because headers are equal lenght.

[TOMIMOTO]

Originally Posted by Thunderchicken

The only way to get the Subaru Turbo rumble is to have unequal length headers.

FYI not go in this type of application, but it's great for single scroll turbo's.

The turbo adds a lot to the sound too.

I have unequal length on my 2.5 na Impreza. It sounds great, but it's definitely missing the throaty burble the turbo brings to the party.

[wcbjr]

Originally Posted by RWD-boxer

Remove you muffler and you will have the rumble.

No, you will not.

[wcbjr]

Originally Posted by Thunderchicken

The only way to get the Subaru Turbo rumble is to have unequal length headers.

FYI not go in this type of application, but it's great for single scroll turbo's.

It works with single-scrolls, or any-scrolls for that matter. But equal length is always better.

[Exhaust]

honestly its not even worth it.

[V1B]

Great info guys .

[Admiral Ballsy]

It's less about primary length than it is how adjacent cylinders are connected. Flat fours fire cylinders on the same bank sequentially.

As you're looking down on the engine, the cylinders are numbered like this:

4 3
2 1

Firing order is 1-3-2-4. What that means is that you get two pulses close together in each exhaust 'side'. If you have a 4>1 header and it's equal-length, then all four-cylinder engines will sound the same. If you have manifolds where each bank dumps together then combines with the other bank, you get the other extreme - the VW Beetle cadence.

The turbo Subs are somewhere in between - they have individual tubing for each cylinder but since they're not equal length, you'll get the burble. But the intensity will vary depending upon engine speed, since at some speeds the pulses will combine and at others they'll be spaced apart.

FWIW this is why "American" V8s sound different than, say, Ferraris. Most V8s have a firing sequence where two cylinders on the same bank fire sequentially. This results in a bigger 'bang' in the exhaust, so you get "bang bang BANG bang bang BANG"...which is why there's a similarity between that sound and a two-cylinder - you hear two of the firing events much more prominently.

Ferrari V8s (and some others) fire in an alternating fashion, so the sound is more uniform and much less distinctive.

This is also why V8s use bigger exhaust tubing and crossover pipes - you have to design the system for the 'big' pulses. Fours (inline anyway), fives, and sixes don't need nearly as much cross-sectional flow area for a given displacement/RPM.

Back to the Toyobaru, near as I can tell the header is not only equal-length or close to it, but it's also a triple Y that joins the non-adjacent cylinders...so it'll really be tough to make it sound like a traditional flat four without replacing the headers.

[RWD-boxer]

Originally Posted by wcbjr

No, you will not.

3k you can hear the rumble for free