Alloytec Exhaust

[VZ_SV6_NZ]

Hi Guys, am new to this forum and have already spent hours looking through everything - seems like an awesome website to get help & share ideas!!

I'm looking at upgrading the exhaust on my '05 SV6. After looking through the various threads on the website it seems i need to be quite careful with what i do to the exhaust, if i want performance and a good note...

My question is, i have heard of people talking about using a standard cat-back system from a 5.7ltr gen III (with the final muffler removed & replaced with a straight pipe). Apparently this gives the alloytec 190 the backpressure it needs while improving performance; along with a quiet, but nice sounding exhaust note.

I have seen exhausts off SS's for a very reasonable price, but to me it almost seems as though your getting something for nothing??

Has anyone done this??

Thanks,
VZ_SV6_NZ

[impulsive]

there are lots of posts on Vz sv6 exhausts, be very careful when selecting an exhaust for your SV6 as a lot out there can make it sound 'rice burnerish' and will lose you power off the line.

I recently (last 8 months) got an exhaust for my SV6 and like you i wanted an exhaust to 'improve performance; along with a quiet, but nice sounding exhaust note'. After a lot of shopping and talking to those that know i found what i wanted! I'd be happy to tell you what i got if you need! as i said though be very careful if your going for an 'exhaust kit' that manufacturers have made! Custom made is best

[impulsive]

P.s Standard cat back systems from Gen III dont really do the trick, lose a lot of back pressure thus losing performance and you will also get a husky sort of noise at top end revs, not what you want i dont imagine ;-) talk to a bloke called that goes under the name of 'nory' in this forum, he has a similiar exhaust as me and it works!

[Not_An_Abba_Fan]

Back pressure is something you don't want. Exhaust gas velocity is. Go too big and you lose velocity, go too small and you restrict the exhaust.

A couple of systems that work very well on the alloytec are a twin 2 1/2" or a single 3". Single 2 1/2" is too small, it may sound OK, but it won't perform. To get the best out of the system, extractors are a good idea too. Kungfoocamel has done a lot of testing on an alloytec and he has the twin 2 1/2" on his. My suppliers have done extensive testing as well, they have 3 cars that the management drive, 2 of those have single 3" and they out perform the other car that has a twin 2 1/2".

[VZ_SV6_NZ]

THanks for that.
I managed to pick up an exhaust off a VZ SS for free (only done 20,000kms), so i thought there would be no harm in experimenting with it.
Replaced the rear resonator with a twin 2" straight pipe section, and left the SS tips on - definitely looks the part (need subtle differences to a standard sv6, as there a quite a few sv6 fleet cars here in NZ).
End result:
Really nice exhaust note at idle, and an awesome sounding growl when the revs are high. No drone at open road speeds as well which is good.
Only problem is it has quite a deep & loud drone at a little over 2000rpm (good excuse to keep the revs up i guess....).
In terms of performance, not much of a difference. No change down low, but maybe a little extra up top - nothing greatly noticable.
Still quite happy with the result at only a cost of $40 for some 2" tube and a 'u' bend.
Really happy i put the SS tips on as well, was tossing and turning quite a bit over whether the standard tip would look better, but the twins are the way to go.

[f1tzy]

P.s Standard cat back systems from Gen III dont really do the trick, lose a lot of back pressure thus losing performance and you will also get a husky sort of noise at top end revs, not what you want i dont imagine ;-) talk to a bloke called that goes under the name of 'nory' in this forum, he has a similiar exhaust as me and it works!

Do you mean "Nordy"?

[Jason12]

Hey guys,
I've bought a VZ SS and i'm looking at putting an exhaust on it. Could any one suggest any exhaust set up that would sound awesome. If anyone knows of any place that do a exhaust pretty cheap let me know as i don't have a **** load to spend on one.

Cheers

[andyman]

was size pipes are the vz ss ute stock twin 2 or twin 2 1/4?

[OBR1EN]

Can anyone tell me if either of these two cat backs would be both it for my alloytec?
Holden VT-VZ Commodore twin 2 1/2 inch sport exhaust - eBay Full Systems, Exhausts, Car Parts, Accessories, Cars, Bikes, Boats. (end time 11-May-08 17:38:20 AEST)

HOLDEN COMMODORE VT-VZ PERFORMANCE EXHAUST SYSTEM - eBay Full Systems, Exhausts, Car Parts, Accessories, Cars, Bikes, Boats. (end time 14-May-08 13:24:00 AEST)

Help PLease!!!

[pk2k78]

Probably should ask the seller. I was looking at those also.

[Not_An_Abba_Fan]

Yes, either one will fit.

[OBR1EN]

Would either be any good if not what would be reccomended for same price range?
Cheers

[Not_An_Abba_Fan]

I recommend a single 3", better torque spread over the rev range and more acceleration.

[SVZWagoon]

Can anyone tell me if either of these two cat backs would be both it for my alloytec?
Holden VT-VZ Commodore twin 2 1/2 inch sport exhaust - eBay Full Systems, Exhausts, Car Parts, Accessories, Cars, Bikes, Boats. (end time 11-May-08 17:38:20 AEST)

HOLDEN COMMODORE VT-VZ PERFORMANCE EXHAUST SYSTEM - eBay Full Systems, Exhausts, Car Parts, Accessories, Cars, Bikes, Boats. (end time 14-May-08 13:24:00 AEST)

Help PLease!!!

hey folks
I realise these may fit ( have asked seller about wagon) but has anyone actually installed them yet on an alloytech... I get the feeeling that because they are cheap they may sound like crap also ... can anyone confirm they are any good ( apart from the seller )

[dvsride]

old thread i know but oh well. I highly reconmend the 3" that n.a.a.f. is talking about, after he fitted one to my sv6 there was a very good power increase. All i am running is the single 3" and a k&n panel filter and she got 193.9rwhpon the dyno. dont think about it, just do it!

[ashbox]

^^ how much of an increase did you get, only reason i ask is cos i've got 193hp without a zorst

[dvsride]

never had it test b4 hand. I could feel a good amount of pick up on her but on the day of the dyno alot of cars where getting alot lower than they usually did, damp wet weather dont help t much i guess.

[pk2k78]

^^ how much of an increase did you get, only reason i ask is cos i've got 193hp without a zorst

Yeah lots of VZ SV6s are making 190ish whp stock. A before dyno would have been good.

I just got my exhaust done and I did get a before dyno (171 whp on petrol, 183whp on Liquid LPG). Its a 175kw with only the MCAI mod.

I just had pacemakers fitted along with 2 X high flow Cat-Co Cats and a stocky Gen 3 exhaust.

Power down low feels similar but def pulls better up top. Torque feels much better over all revs. Sounds good at low revs, not loud at all and no drone. Sounds a touch farty when I take it to redline.

Improvement in fuel economy straight away. On 1st hwy run trip computer got down to 7.2 l/per 100kms previous record was 7.8. Around town economy is much better also.

Getting a full tune within the next couple of weeks so the results will be interesting. I'm hoping to get close to 200whp considering the advantages of LILPG.

[danja]

The ol' rule of thumb "engine kW = wheel HP" holds true

[Ewok]

pk2k78 thats some nice figures from a 175 mate. Nice work. I posted my dyno results a while ago of mine pulling 192.3rwhp and mcabe had a whinge saying that it was a "happy dyno" , going to tell everyone else who has had theirs dyno'd and pulled similar stock figures that EVERY single one of their dyno's is happy aswel? didn't think so.

Going to go for VCM, 3.46 diff gears and exhaust after my wedding next year (when the missus will losen the reins on my spending haha). And yeah Danja, thats pretty true 192rwhp is 143rwkw from a 190kw motor stock.

[impulsive]

hey Ewank, wasnt me whinging mate, get over your **** 190RHP wooppddeedooo, come see me when you wanna race huh!

[Verds]

I was looking at paceie extractors to twin high flow cats throught to 2 1/2 " exhaust with resinators. Thats $2500 Also the exhaust guy said that it is hard to get a good note out of the alloytech. He also has the same system on his crewman. Also on the crewman you have to extend the oxygen sensor loom to fit aftermarket extractors.

[pk2k78]

I was looking at paceie extractors to twin high flow cats throught to 2 1/2 " exhaust with resinators. Thats $2500 Also the exhaust guy said that it is hard to get a good note out of the alloytech. He also has the same system on his crewman. Also on the crewman you have to extend the oxygen sensor loom to fit aftermarket extractors.

$2500?! Where abouts do you live buddy? If Melbourne try Dandy exhaust. I got pacies and high flow cats fitted for $1000. Wanted another $500 for a cat back.

You have to ring around. I got quoted $750 for pacies supplied not fitted at one place!

[Verds]

Yea i thought 2500 was a bit rich. I live in brissy. I paid like 750 for the same style exhaust on my old falcon XH I6. so i thought it was a tad bs. When i get serious about doing it ... when i get a hole or crack or even a dent i will look at replacing it. He also said it was 250 for the extended loom for the oxygen sensor ... also i thought that was a tad rich. That was some exhaust shop on the gold coast.

[pk2k78]

Yea i thought 2500 was a bit rich. I live in brissy. I paid like 750 for the same style exhaust on my old falcon XH I6. so i thought it was a tad bs. When i get serious about doing it ... when i get a hole or crack or even a dent i will look at replacing it. He also said it was 250 for the extended loom for the oxygen sensor ... also i thought that was a tad rich. That was some exhaust shop on the gold coast.

Interesting I didn't have to pay anything for the oxygen sensor loom... amybe they didn't use one?