Short Header for VYII How will it compare with longer ones

[hazey]

I dont want to start another exhaust thread here so lets not go of track. After specifics here,

As most of you know. VYII series have moved 02 sensors and cats up closer to stock headers.

What I know:
1)You can get normal long 4<1 but have to extend 02 cable and cats. Possibility this can hurt power and would have to get edit to restore. (something to do with it ony reading of 1 or 2 headers??)...Thunder??

2) Use the Short Headers made for the VYII

What would the difference be between the short 4<1 1 5/8 headers compared to normal 4-1 long headers.

I am refering to Low to Mid power and how the exhaust note will sound. I have learnt that the header is what really gives the v8 gurgle sound.
And I would assume that the short header would be same size as std, therefore not improving sound

sorry for long post

[jneil]

I just put on the long Pacemaker Tri-y's with 1 5/8" primaries on my VYII SS 6M, my O2 were lenghtened, but I also got an edit. No engine lights so far & power seems to be up there....232rwkw!

Oh yeah, the rest of the system is a 2.5" DiFilippo in mild steal with K&N, 2nd hole and 4" MAF pipe.

Have a look and listen (http://stan.cc.swin.edu.au/%7Ejeff/nascar/vyiissafter.wmv) or just a listen (http://stan.cc.swin.edu.au/%7Ejeff/nascar/vyiissafter.mp3)

Jeff.

[MNR-0]

Not a great deal of difference for our bolt-on cars IMHO. I have the CSV short 4-1 and they are great. The catback will add more to the sound than a header will, especially the over-run and cackle.

[hazey]

MNR-0,

Have you listened to how Jneils VYII SS sounds. How would you compare your exhaust sound.

If the short headers + dual 2.5 system can sound similar to what Jneil's does that I will be happy and My questions would be answered.

What is your rwkw? Do you have edit? How was low - mid torque increased?

[chook]

VYII , H&M Headers (long), new cats in old position, + edit - 245rwkw

[hazey]

chook,

when did you get your edit done?

It seems getting the edit along with normal long headers presents no problems and high power.

I just cant afford to get them both at the same time. Just interested to know if anyone has noticed any problem with just getting long headers without the edit.

cheers

[MNR-0]

MNR-0,

Have you listened to how Jneils VYII SS sounds. How would you compare your exhaust sound.

If the short headers + dual 2.5 system can sound similar to what Jneil's does that I will be happy and My questions would be answered.

What is your rwkw? Do you have edit? How was low - mid torque increased?

I have a 2.25" dual setup. I have heard 2.5" catbacks with the shorty headers and they sound solid and strong. Ive heard JNeils setup and the catback is what is giving you 80% of the note. The cats up front do seem to deaden the sound somewhat, but not overly so. Thats good for ADR.

You wont be fully informed unless you listen to one, so I suggest you take a visit to CSV and get them to show you Garys setup and hear how it sounds.

My setup makes anywhere from 212-225+rwkw depending on whose dyno you visit. It pulled 104.8PMH down the quarter a few weeks back and its just a tune and exhaust with shitty transmission points. So the HP is definately there.

Mid torque is great - breaking traction into 2nd is fun. Also I can lose traction at any speed in 1st gear if I want to. Shifting back to 2nd from 3rd also breaks traction if I floor it.

Hope that helps.

[VTSS195i]

i had the same Difillippo cat-back on my VY SS II (with stock headers) and it didn't sound anything like jneils!

[MNR-0]

i had the same Difillippo cat-back on my VY SS II (with stock headers) and it didn't sound anything like jneils!

Well on a VYII it wouldnt. As I said earlier, the cats up front seem to deaden the volume a little. Remember a catback doesnt replace the 2" intermediate pipe between the cat and the catback either. And as I stated earlier Headers will make a difference to exhaust note, but not as much as a catback will.

[VTSS195i]

Anybody else got any experience with the VYII???
Anyone used the short headers with a twin 2.5" cat-back??
Any more sound files??
Cheers

[MNR-0]

I will post a vid of my exhaust over the weekend here. You can then judge for yourself.

[markone2]

Well on a VYII it wouldnt. As I said earlier, the cats up front seem to deaden the volume a little. Remember a catback doesnt replace the 2" intermediate pipe between the cat and the catback either. And as I stated earlier Headers will make a difference to exhaust note, but not as much as a catback will.


Sorry off topic a bit here...master mnr-o......I most sincerely trust you have the increased the size of the 2" section of pipe you mention in your above post :eek:

[Mongy]

Sorry off topic a bit here...master mnr-o......I most sincerely trust you have the increased the size of the 2" section of pipe you mention in your above post :eek:
Mark, they are a weird system, they are 2” from the cats to the first flange, then 2 1/4” to the front mufflers, inside the mufflers it tapers back to 2” to the rear resonator then would you believe 2 1/8” out of it. So anybody doing a cat back has to do the front pipes as a separate job and open the cats up because all the “off the shelf” cat backs don’t seem to include the front pipe. Maybe that is another little trick they are keeping up their sleeve to get more cheap power out of the VZ when it is released, change it all to 2 1/4” because it would not be too much louder.

[MattJ]

I dont want to start another exhaust thread here so lets not go of track. After specifics here,

As most of you know. VYII series have moved 02 sensors and cats up closer to stock headers.

What I know:
1)You can get normal long 4<1 but have to extend 02 cable and cats. Possibility this can hurt power and would have to get edit to restore. (something to do with it ony reading of 1 or 2 headers??)...Thunder??

2) Use the Short Headers made for the VYII

What would the difference be between the short 4<1 1 5/8 headers compared to normal 4-1 long headers.

I am refering to Low to Mid power and how the exhaust note will sound. I have learnt that the header is what really gives the v8 gurgle sound.
And I would assume that the short header would be same size as std, therefore not improving sound

sorry for long postCan't beat a long tube header on the LS1.

Cheers Glenn

[MNR-0]

Yeah MarkOne2, I opened up the CATS and put in 2.25" intermediates. There is also the 3" pipe between the header and CATS where the O2 sensor lives. Its also a metric 2". I enlarged that too, though I dont think it would matter much on a stockie.

[VTSS195i]

A guy on here named Forrestd has a Vy ute (series 1) with a Corsa system which sounds awesome. He posted some sound files a while ago.
http://members.optusnet.com.au/~duncan_forrest/ute3.wmv
If I can get that sound I will be very happy.
I wonder if CSV will put a series 1 system on a series 2??? I know they were recommending not to move the cats because of warranty issues.

[Thunder]

The VY2 will lose power if you go for the long type extractors and move the o2 sensors back to the old position (VT-VY1) unless you are getting edit at the same time.

If you are not going to get your car edited, stick with shorter extractors that have the O2 sensor forward. We have 2 types of short ones. 1 set retains the original cats but you will need 2-1/2" con pipes back to the system. The other set is longer with the O2 sensor forward, but suits hi-flo cats in the old position.

The other cheaper option is to leave the standard manifolds & cats and put 2-1/2" con pipes from the cats back to the system.

Hope this helps.

:cool:

[naff]

Here's somethin else for ya's to get around, next years V8 commo's are gonna run 4 O2 sensors! One in front and behind each cat!
I'm not sure wether it's the series 1 or series 2 VZ that it will be appearing on.
And this aint a maybe, it's gonna be happening.

[MNR-0]

Here's somethin else for ya's to get around, next years V8 commo's are gonna run 4 O2 sensors! One in front and behind each cat!
I'm not sure wether it's the series 1 or series 2 VZ that it will be appearing on.
And this aint a maybe, it's gonna be happening.

O2 sensors will be controlling more and more of our cars tune.

VTSS195i, a Tuner will do pretty much anything you want. Its your car.

[Public Enemy]

I just put on the long Pacemaker Tri-y's with 1 5/8" primaries on my VYII SS 6M, my O2 were lenghtened, but I also got an edit. No engine lights so far & power seems to be up there....232rwkw!

Oh yeah, the rest of the system is a 2.5" DiFilippo in mild steal with K&N, 2nd hole and 4" MAF pipe.

Have a look and listen (http://stan.cc.swin.edu.au/%7Ejeff/nascar/vyiissafter.wmv) or just a listen (http://stan.cc.swin.edu.au/%7Ejeff/nascar/vyiissafter.mp3)

Jeff.
Exact same setup on my 2003 Monaro A4 but without an edit!

[jneil]

Exact same setup on my 2003 Monaro A4 but without an edit!

What sort of power are you making?? Is your fuel economy OK?? I would think that an optimised edit tune will give you a good deal more power/torque and better fuel consumption.

[Public Enemy]

What sort of power are you making?? Is your fuel economy OK?? I would think that an optimised edit tune will give you a good deal more power/torque and better fuel consumption.

There is noticable mid range power.. fuel consumption increased a bit.

I have ls1edit and i did the fan temps and the torque settings and took off the speed limiter. People told me not mess with air/fuel ratio except on a dynometer but we dont have one in a country so i dont consider my car fully tuned :(.

[spank]

i fitted hm headers and vy 1 series cats and cats back and just lengthened the o2 harness on a vy11 ss m6 , its been three weeks of daily driving no warning lights and the car feels better anyway and sounds better definately , its yet to get edited or see a dyno , but no probs so far just fitting exhaust

[jneil]

There is noticable mid range power.. fuel consumption increased a bit.

I have ls1edit and i did the fan temps and the torque settings and took off the speed limiter. People told me not mess with air/fuel ratio except on a dynometer but we dont have one in a country so i dont consider my car fully tuned :(.

Yes, It would be quite difficult trying to guess the AFR's. Perhaps you need to invest in a Dyno and do other LS1's for a living.

Jeff.