Tuesday, September 04, 2012 - 07:20 am, by: Lawrence Tan(Tonkatsu)
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.
Tuesday, September 04, 2012 - 07:35 pm, by: Peter Williams(Skeeta)
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.
Wednesday, September 05, 2012 - 07:54 am, by: Daniel Marshall(Ydass)
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.
Wednesday, September 05, 2012 - 08:17 am, by: David Boyle(Amokzar)
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.
Wednesday, September 05, 2012 - 12:27 pm, by: Mike Beck(Gold_40gt)
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.
Thursday, September 06, 2012 - 08:41 am, by: Rory Braatvedt(Fallward)
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.
Thursday, September 06, 2012 - 08:51 am, by: Lawrence Tan(Tonkatsu)
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.
Thursday, September 06, 2012 - 04:34 pm, by: Mike Beck(Gold_40gt)
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
Thursday, September 06, 2012 - 07:51 pm, by: Peter Scott(Planetsoarercom)
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
Thursday, September 06, 2012 - 08:24 pm, by: Mike Beck(Gold_40gt)
^ 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!
Doing the headers now, but they are in the vicinity of $1k to fabricate, however will make the note that much sweeter.
Friday, September 07, 2012 - 05:12 am, by: Mike Beck(Gold_40gt)
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.
Saturday, September 08, 2012 - 05:50 am, by: Lawrence Tan(Tonkatsu)
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.
Saturday, September 08, 2012 - 07:31 am, by: Rory Braatvedt(Fallward)
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
Saturday, September 08, 2012 - 06:28 pm, by: Mike Beck(Gold_40gt)
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.
Monday, September 10, 2012 - 07:24 pm, by: Lawrence Tan(Tonkatsu)
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.
Monday, September 10, 2012 - 07:42 pm, by: Mike Beck(Gold_40gt)
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.