| Author |
Message |
Sam Schreck
DieHard
ACT
vvt-i JZZ31
Posts: 746
Reg: 07-2005
|
I know this has been done to death, on TT's and V8's but I can't find anything related to us 3.0/6 Soarer owners. I'm booked in to have a cat-back exhaust put in this Friday. You know, it MUST be done before Easter, espaecially if we're going to be recording exhausts up the road from Neils.
I remember at the Canberra cruise last November, someone asked me if my car was actually running  . So next week I'm hoping for a level above 5 or 6 db. Anyhow......
I was planning on twin 2.5" pipes into twin offset-offset mufflers. I want to keep the original dual/twin pipe look (love it). The "98 vvt-i comes with factory headers so I don't need to worry about that side of things. I'm hoping for a nice deep throaty sound at the end and hopefully some decent increase in performance/less restriction.
Am I dreaming?
Are the 2.5" pipes too large for my car?
What mufflers would give the best sound. Something nice and rumbly, if possible? |
Don Bagnall
Moderator
New Zealand
I have LESS Soarers than Hayden :-(
Posts: 3109
Reg: 05-2005
|
Sam, I wouldn't go bigger than 2", otherwise low end torque may suffer a tad 
But others may have a more diffinitive answer. |
Daniel Clarke
Tinkerer
NSW
TT 2.5L 6 cylinder
Posts: 56
Reg: 03-2006
|
Don has a good Point. A 3L motor only needs a single 2 1/2 inch system on its own, maybe 3inch if going to do further mods, cams, computer BFI and such.
So 2 times 2 1/2 inch would be too much. Running twin 2's like Don says would still give you the sound you are after, Make more power and still have tons of the good stuff, Torque 
I had a modified 4.0L Falcon (EA,hehe) Headwork,cam,computer, Extractors and 2 1/2 inch system. 5 speed, LSD and it ran 14.0 @ 97 mph. Didnt see the need for 3 inch and it was making 224hp@wheels.
Most guys with V8's may run twin 2 1/2 systems(from most i have seen on here so far even a 4.0 with modifications are running twin 2.25inch), but they have 2 more cylinders and 1.0 more litres! |
David Vaughan
Goo Roo
ACT
UZZ31 V8 manual and Lexus IS300
Posts: 1782
Reg: 07-2005
|
Mine is one of the 2.25 V8s. It was as much as they would recommend to me without picking up a lot more noise. With the collector restriction gone, the noise is a lot deeper.
The IS300 3 litre uses a 2" system as standard but with more muffling than you will have.
Where are you getting it done? May I suggest you get opinions and one of your quotes from Ian Lampl? See the Soarer Mechanics guide. |
Sam Schreck
DieHard
ACT
vvt-i JZZ31
Posts: 749
Reg: 07-2005
|
Thankyou gentlemen. David, I'm getting it done at Belconnen Exhaust Centre. They did my previous car (ZR Celica) and I was happy with the work. I'll be doing the BFI 3 in the next week or so too. In the near future I also plan on a Mines ECU or someting along that line, perhaps. That'll be it as far as performance mods go. |
Mark Paddick
Goo Roo
ACT
UZZ31 V8 Soarer , JZZ30 TT Soarer
Posts: 2241
Reg: 07-2005
|
They are good. He can do custom extractors too, builds them on the car. i wouldn't go more than 2" either. Twin 2" is enough for a blown 9 litre V8 (Chrysler) if you are looking for torque rather than outright power so should suffice for a 3 litre even though it can rev a fair bit more. |
Sam Schreck
DieHard
ACT
vvt-i JZZ31
Posts: 756
Reg: 07-2005
|
All done!!! Dual 2 1/4 inch cats, into dual 2 1/2 inch something or others, then dual 2 1/4 inch pipes with some nice Lukey's. Hard to say at this point wether I'm getting any performance improvement, sounds SUUWEEEEET outside  and still nice and quiet inside. Now I"m getting started on the BFI 3.  |
David Vaughan
Goo Roo
ACT
UZZ31 V8 manual and Lexus IS300
Posts: 1808
Reg: 07-2005
|
No 'before' dyno reading? |
Sam Schreck
DieHard
ACT
vvt-i JZZ31
Posts: 757
Reg: 07-2005
|
I forgot to take my camera with me. It' looks almost the same, except the exhaust is now gloss black, the mufflers are gloss black, and much smaller. The tips look the same. I wanted it to look factory as not to attract attention.
David, no 'before' dyno reading unfortunately. It feels a little more open, if you get my drift.
Did I mention it sounds good.  |
Neil Griffiths
Trader
NSW
I have MORE Soarers than Hayden :-)
Posts: 1868
Reg: 07-2005
|
Sam,,You should have done a Twin 1.5 inch...More power gains |
Don Bagnall
Moderator
New Zealand
I have LESS Soarers than Hayden :-(
Posts: 3138
Reg: 05-2005
|
Sam Schreck wrote on Friday, April 07, 2006 - 02:15 pm:then dual 2 1/4 inch pipes
What happened to NO BIGGER THAN 2", Hmmmmmm!.
OR, like Neil says: 1.5".........."Mr.No torque down low"!!!!.
Grrrrr! etc, plus GST
|
Peter Nitschke
JunkFilterer
South Australia
GT4.0 V8
Posts: 4079
Reg: 11-2004
|
BP? |
Don Bagnall
Moderator
New Zealand
I have LESS Soarers than Hayden :-(
Posts: 3148
Reg: 05-2005
|
Exactly!! |
Sam Schreck
DieHard
ACT
vvt-i JZZ31
Posts: 758
Reg: 07-2005
|
I'm feeling a bit stupid at the moment. I new I wanted twin 2" pipes. I'm questioning what I DO actually have now? I don't see why any exhaust 'specialist' would go from 2 1/4" cats to 2 1/2" and then back to 2 1/4" again. Maybe it is 2 1/4 into 2", I'll check tomorrow. If not, I guess I'll just have to live and learn  .
p.s I would've expected that a company who's business is exhaust systems would know what to do, especially when I asked for something to improve performance. |
Cihan Aday
DieHard
Victoria
JZZ30
Posts: 675
Reg: 07-2005
|
Exhaust systems are trial and error if you want perfection, but, perfection is something that depdends on a lot of things. For example, changing the dynamic compression of an engine changes exhaust requirements, higher overlap cams make more power with low backpressure exhaust systems because of reversion, which means you want large primaries and if possible, no collector. A proper exhaust system flows enough to keep backpressure below 1psi and promotes maximum cylinder filling at all RPMs. Its possible, even though many will say it isnt.
Serious mods are rare on these engines, youd probably want something that sounds good over something that'll drone and make 1kw more. In an NA motor, an exhaust systems one of the last things you'd want to change in chase of power (IMHO). Work the front end, then upgrade the exhaust and feel the difference.
If it were up to me, id run 2.5" off the extractors into a de-CAT pipe, into 2x2.25" mandrel bend pipes with some Japanese stainless steel rear mufflers. Also you'd want a high quality center stainless steel box type resonator to elmininate drone but retain a throaty sound.
Ill openly state that a well designed low backpressure exhaust system that complements a particular extractor/header design wont reduce low end torque by a significant margin. In most cases the extractor primary pipe length is extended to compliment mid-low range torque, so you dont lose anything at all. |
Sam Schreck
DieHard
ACT
vvt-i JZZ31
Posts: 759
Reg: 07-2005
|
Huge thanks to Mark Paddick, who yesterday successfully removed my VERY stubborn drivers side headlight and got me on the road to better air intake.
Apart from the panels around the airbox the BFI is finished. The 3 holes are done, the pathetic intake snorkel is removed and already there's a huge difference in suckage. Not bothering with the egg cups as you won't even see the holes once the top cover's on. Admittedly, the really noticeable increase in performance is from around 4000RPM and up. Once the vvt-i kicks in it really pulls some air in, almost sounds like it's whistling. There is some improvement down low as well but nowhere near the same extent.
It's a shame I stuffed up with the exhaust, could've been even better... still very happy with the end result though. |
Graham Dollisson
DieHard
QLD
I have more Leylands than Don
Posts: 683
Reg: 07-2005
|
Sam Schreck wrote on Sunday, April 09, 2006 - 02:35 pm:Not bothering with the egg cups as you won't even see the holes once the top cover's on
The egg cups aren't there for just looks!! They are there to help air flow. |
Sam Schreck
DieHard
ACT
vvt-i JZZ31
Posts: 760
Reg: 07-2005
|
I really don't know a hell of a lot about cars do I!!! |
Don Bagnall
Moderator
New Zealand
I have LESS Soarers than Hayden :-(
Posts: 3191
Reg: 05-2005
|
"Life is a learning experience Sam, and so is the world of Soarers"  |
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