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  Soarer Central * Mechanical - V8 * Modifying Standard Exhaust * Archive through September 10, 2012 Previous Previous    Next Next  

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Lawrence Tan
Tinkerer
NSW
91 UZZ31 V8

Posts: 26
Reg: 08-2012

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Tuesday, September 04, 2012 - 07:20 am, by:  Lawrence Tan (Tonkatsu) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hi all

Lots of exhaust breakdowns on planetsoarer and here but I havent been able to get the info I want.

I have a 91 UZZ31, it's my daily cruiser so I'd rather spend the big bucks on maintaining it rather than shoot for performance.

One thing that bugs me a little is that I cant hear the V8 at all. I managed to get a full stock exhaust off a helpful member here so I'm looking to modify it.

Im thinking of taking one of the below approaches.

Stock x2 front cats > NO center resonator > NO middle mufflers > finishing at stock rear mufflers.

I haven't been able to find sound clips of this setup or any detailed feedback of this setup. My aim really is just to be able to hear the V8 without unnecessary drone.

Alternatively I was thinking maybe doing the above but leave the stock middle resonator in place just to make sure it's not too loud?

Any thoughts or input on this would be much appreciated.

I won't be using any aftermarket mufflers, x pipes , cats or headers at this point. Only just modifying stock exhaust.
Peter Williams
TryHard
Victoria
V8

Posts: 154
Reg: 01-2009

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Tuesday, September 04, 2012 - 07:35 pm, by:  Peter Williams (Skeeta) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I have Rush extractors, hiflow cats, no centre resinator, using stock middle mufflers, and a couple of small cannons in place of the rear mufflers. Doesn't drone and has the V8 burble you are looking for, without being too loud.
Lawrence Tan
Tinkerer
NSW
91 UZZ31 V8

Posts: 27
Reg: 08-2012

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Tuesday, September 04, 2012 - 08:51 pm, by:  Lawrence Tan (Tonkatsu) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Cheers mate but I'm looking to just modify a stock system for now.

A full blown system is not on the cards at the moment.
Daniel Marshall
TryHard
QLD
V8 UZZ31 X2

Posts: 192
Reg: 07-2011

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Wednesday, September 05, 2012 - 07:54 am, by:  Daniel Marshall (Ydass) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

My old system was all stock. I just removed the section after the diff and made straight through pipes.
So cats, centre muffler,midmuffler and the straight throughs
Sounds good when you stomp on it or quiet when cruising.
David Boyle
TryHard
NSW
Soarer GT limited

Posts: 419
Reg: 05-2009

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Wednesday, September 05, 2012 - 08:17 am, by:  David Boyle (Amokzar) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Just a heads up, if you remove just the center resonator there will be no real difference in exhaust note. though i think on planet soarer there was a clip of some one who had removed the resonator and middle mufflers and it sounded alright.

http://planetsoarer.com/sounds/sounds.html
Lawrence Tan
Tinkerer
NSW
91 UZZ31 V8

Posts: 28
Reg: 08-2012

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Wednesday, September 05, 2012 - 10:46 am, by:  Lawrence Tan (Tonkatsu) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Cheers for that!

I went through most of planetsoarer trying to dig out that info.

It has sound clips of parts of the exhaust progressively removed, but not the configuration I'm after.

anyone here that has there middle resonator and middle mufflers removed and would like to comment?
Mike Beck
Goo Roo
New Zealand
BMW E36 Coupe 1UZFE V8 340i

Posts: 5594
Reg: 11-2005

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Wednesday, September 05, 2012 - 12:27 pm, by:  Mike Beck (Gold_40gt) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Best thing to do is get rid of the 2.5" middle resonator and the Y pipes, just replace it with twin straight pipes, perhaps an H or X pipe if you like.

Although the stock 4 rear mufflers will kill any distinctive note... as will the stock headers.

Keep in mind a full exhaust with extractors would cost you around the 2k mark.
Rory Braatvedt
Tinkerer
North Island
Soarer v8

Posts: 91
Reg: 06-2009

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Thursday, September 06, 2012 - 08:41 am, by:  Rory Braatvedt (Fallward) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I've had loads of experience in this area mate. Spend a lot of time researching and exploring different setups (i had a budget of $1k and i realise you don't want to spend money). Listen to the audio clips in the link above. Basically, these exhausts are pretty damn quiet. Removing the two rear mufflers adds a little burble but obviously doesn't look any good. If you care about that, then take out the reso and the 2 mufflers after them and hope for the best. If i could do my exhaust all over again, i'd get split pipes with an xflow into Flowmaster 40's. The stock Y setup just doesn't sound that great.
Lawrence Tan
Tinkerer
NSW
91 UZZ31 V8

Posts: 29
Reg: 08-2012

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Thursday, September 06, 2012 - 08:51 am, by:  Lawrence Tan (Tonkatsu) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hey Rory

I have got a proper exhaust on the list of things to do later on, but I'm still working on getting the EMV and airbags up to scratch before I look into a custom setup.

At this point I'm quite keen on just replacing the middle mufflers and middle resonator with straight pipes leading to the stock end mufflers. Unfortunately the stock " Y " pipe will have to stay.
Daniel Marshall
TryHard
QLD
V8 UZZ31 X2

Posts: 194
Reg: 07-2011

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Thursday, September 06, 2012 - 09:19 am, by:  Daniel Marshall (Ydass) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Unbolt your rear mufflers. Simple. will give you great tone everyone seems to like my car.

It's 4 bolts go try it! Haha
Mike Beck
Goo Roo
New Zealand
BMW E36 Coupe 1UZFE V8 340i

Posts: 5599
Reg: 11-2005

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Thursday, September 06, 2012 - 04:34 pm, by:  Mike Beck (Gold_40gt) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Lawrence Tan wrote on Thursday, September 06, 2012 - 08:51 am:

Unfortunately the stock " Y " pipe will have to stay.




If you like, but I would suggest removing them. They are a pressed type, so the 2 or 2.5" front pipes after the cats condense down into halves to squeeze into a single 2.5" resonator... pretty nasty for sound and performance! If you look at a genuine Y pipe they have a much smoother transition.
Peter Scott
TryHard
South Australia
UZZ32 Active V8

Posts: 166
Reg: 08-2005

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Thursday, September 06, 2012 - 07:51 pm, by:  Peter Scott (Planetsoarercom) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

hmmm
stock cats,
resonator leave it there.
unbolt 4 rear mufflers.
get some lukey turbo muufflers (not straight through), full size, double offset, same diameter, use same tips, mild steel for lot.

$400 installed.

Your suggested plan won't satisfy you. Leave airbox lid open for instant induction noise gratification
Mike Beck
Goo Roo
New Zealand
BMW E36 Coupe 1UZFE V8 340i

Posts: 5600
Reg: 11-2005

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Thursday, September 06, 2012 - 08:24 pm, by:  Mike Beck (Gold_40gt) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

^ Wouldn't it be too quiet with Lukey turbo style mufflers Pete?

Too further my input, If you shop around you can get some great systems.

This cat back exhaust off an RS4 bolted right up under my V8 E36 with minimal modification. (Granted it probably wouldn't work on a UZZ3X unless the underside of the car works it's favor)

Only cost me $100 from a scrap yard! Great value/dollar ratio!


Upload


Doing the headers now, but they are in the vicinity of $1k to fabricate, however will make the note that much sweeter.
Allan Langford
DieHard
Vic
UZZ31

Posts: 745
Reg: 05-2010

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Thursday, September 06, 2012 - 09:22 pm, by:  Allan Langford (Allan) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

i want those "bi-modal" valves!!! is there another set there?
Ali Saeed
Goo Roo
WA
RSP GT-T

Posts: 4167
Reg: 09-2007

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Thursday, September 06, 2012 - 11:05 pm, by:  Ali Saeed (Ali) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Mike post a video of that exhaust please
Mike Beck
Goo Roo
New Zealand
BMW E36 Coupe 1UZFE V8 340i

Posts: 5604
Reg: 11-2005

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Friday, September 07, 2012 - 05:12 am, by:  Mike Beck (Gold_40gt) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Allan Langford wrote on Thursday, September 06, 2012 - 09:22 pm:

i want those "bi-modal" valves!!! is there another set there?




They are great aren't they, they actually change the tone quite a bit - main use is of them is to remove the low RPM rumble. Could you make use of them on the Soarer?


Ali Saeed wrote on Thursday, September 06, 2012 - 11:05 pm:

Mike post a video of that exhaust please




Haha, I would, I would - dying to hear it but there aren't any headers on at the moment, I'm working on some custom ones.
Allan Langford
DieHard
Vic
UZZ31

Posts: 748
Reg: 05-2010

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Friday, September 07, 2012 - 08:04 am, by:  Allan Langford (Allan) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

i could very much make use of them!!!
Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31

Posts: 12405
Reg: 11-2004

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Saturday, September 08, 2012 - 01:50 am, by:  Peter Nitschke (Pen) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Lawrence, I would definitely go with your first stated system - cats, no resonator, no middle mufflers and stock rears and see how you like it.

Next step would be to swap the rears for hi-flo's if you want it a bit more obvious.

The centre resonator is what mostly kills the V8 burble sound.

This is my experience.
http://soarer.ace.net.au/exhaust.html


There are other videos on the site too. eg http://soarer.ace.net.au/videos.html
Lawrence Tan
Tinkerer
NSW
91 UZZ31 V8

Posts: 30
Reg: 08-2012

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Saturday, September 08, 2012 - 05:50 am, by:  Lawrence Tan (Tonkatsu) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hey Peter

Thanks for that exactly the stuff I'm after!!

I'm headed to an exhaust shop later this morning so I'll see how it goes! My only concern about leaving the resonator was to cut down on drone , but if it doesn't make that much of a difference then it's coming out.
Rory Braatvedt
Tinkerer
North Island
Soarer v8

Posts: 92
Reg: 06-2009

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Saturday, September 08, 2012 - 07:31 am, by:  Rory Braatvedt (Fallward) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Well the zorst on my Soarer is 2.25inch pipes from collectors all the way back (NO cats), aftermarket resonator (after factory Y join) then 2 sports mufflers at rear (NZ brand Coby) and mate it's pretty damn quiet. Also, negligible performance difference.
Mike Beck
Goo Roo
New Zealand
BMW E36 Coupe 1UZFE V8 340i

Posts: 5610
Reg: 11-2005

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Saturday, September 08, 2012 - 06:28 pm, by:  Mike Beck (Gold_40gt) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Allan Langford wrote on Friday, September 07, 2012 - 08:04 am:

i could very much make use of them!!!




Well perhaps at the right price I could remove a pair off the mufflers I won't be using?

Not sure what such a part is worth to you, but I looked and looked a couple of years ago when I wanted a pair, a very hard part to find!

These run 2.25 inner diameter tube, probably condenses down to around 2.0" where the butterfly valve is inside, they are beautifully made, great seal etc.
Mark Donovan
DieHard
Auckland
V8 Limited

Posts: 785
Reg: 07-2005

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Saturday, September 08, 2012 - 07:11 pm, by:  Mark Donovan (Mark_donovan) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Not to mention a hefty weight penalty. They are heavy bastards.
Lawrence Tan
Tinkerer
NSW
91 UZZ31 V8

Posts: 35
Reg: 08-2012

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Monday, September 10, 2012 - 07:24 pm, by:  Lawrence Tan (Tonkatsu) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Figured I'd post an update.

Over the weekend I had the centre mufflers + resonator replaced with straight piping.

So setup was stock cats > straight pipes > stock end mufflers.

Overall tone has changed a little in the mid range, the trademark low v8 burble is very very subtle.

final result is about a 15% difference in tone and sound.

those stock end mufflers are ridiculously restrictive. Still I'm happy with the result as its still nice and quiet until I boot it. If my cats go anytime in the near future then I will go for a full custom system.
Daniel Marshall
TryHard
QLD
V8 UZZ31 X2

Posts: 204
Reg: 07-2011

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Monday, September 10, 2012 - 07:29 pm, by:  Daniel Marshall (Ydass) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

That's why I left the rest and ditched the rear mufflers onlymade a huge difference
Mike Beck
Goo Roo
New Zealand
BMW E36 Coupe 1UZFE V8 340i

Posts: 5614
Reg: 11-2005

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Monday, September 10, 2012 - 07:42 pm, by:  Mike Beck (Gold_40gt) Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

The stock mufflers at the back aren't as bad as you think, they are a turbo style muffler so not straight through. The are are designed well and very good at canceling out noise.

Its the middle section mufflers and center resonator which are the main bottle necks.

But, after all the exhaust manifolds up front are the real killer for performance and purity of the V8 exhaust note.

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