Exhaust Butterfly Valves - Anyone Retrofitted Theirs?

[99PBATR]

I am quite keen on retrofitting my Monaro with the exhaust valve butterflys and wondered if anyone has done this (Mine has a Wortec sports exhaust and 200 CEL CAT's) and if so what sort of cost and was it worth it?

Also what did most go for, IE electronic or mechanically actuated? Some pics of the install would be good too please!

[vxr2010]

electric ones are prone to failure , i’m sure it can be done but it may be a case of butchering the current back box to make it work , the vacuum operated valves i got via ebay in china they have been fine , cable is another option but length of cable can be an issue

[L2VXR]

If you have the later small boot wortec it should just be a case of removing the spacer and replacing them with valves . You can get valves cheap or expensive but they all need maintenance to keep them working

I did mine for around £60 with valves from china so was it worth it YES
Monkfish used to want around £600 would that have been worth it PROBABLY NOT

Edited by L2VXR on Sunday 29th December 21:55

[99PBATR]

L2VXR said:

If you have the later small boot wortec it should just be a case of removing the spacer and replacing them with valves . You can get valves cheap or expensive but they all need maintenance to keep them working

I did mine for around £60 with valves from china so was it worth it YES
Monkfish used to want around £600 would that have been worth it PROBABLY NOT

Edited by L2VXR on Sunday 29th December 21:55

Much appreciated fella. Is yours a Wortec exhaust too? I don't suppose you have a link to the kit do you by any chance. I found another kit on an old link on here but they don't make the kit anymore. I don't suppose anyone also has a pic of the setup installed do they, as I have never seen one in the flesh?

[L2VXR]

There are as far as i know 3 types of monaro wortec exhaust
2004 single sided exit, interchangeable loud or quiet silencer boxes/pipes
2005> Mk1 as above but dual exit
2005> Mk2 dual exit but the rear boxes have an interchangeable spacers one each side the spacers are steel plates that either have a hole in them(loud) or no hole (quiet)..... or the spacer is totally replaced with the valve which conveniently is the same size shape as the spacer.
So first step is find out which wortec you have. ...mine is the later one with the spacer

I bought 2 of these 3" kits and a power cable joint to run both off of one controller

?20.79 25%OFF | ESPEEDER 3 Inch Stainless Steel Headers Electric Exhaust CutOut Vavle Cut Out Kit With Manual Switch Car Modified Exhaust
https://a.aliexpress.com/tJeO0ClYJ

Edited by L2VXR on Monday 30th December 21:11

Edited by L2VXR on Monday 30th December 21:56

[SturdyHSV]

I think a lot of the Wortec kits were 2.5", so worth double checking?

3" generally wasn't considered necessary until comfortably over 600hp.

[L2VXR]

SturdyHSV said:

I think a lot of the Wortec kits were 2.5", so worth double checking?

3" generally wasn't considered necessary until comfortably over 600hp.

The exhaust tube is 2.5" but the cut out valve used is classed as 3" . ie a 3" cutout has a 2.5" flap a 2.5" cutout has a smaller flap and would restrict the flow

2.5" cutout


3" cutout

Edited by L2VXR on Tuesday 31st December 09:53

[99PBATR]

How do they sound, open & closed?

[vxr2010]

basically closed they sound like a slightly loud but fairly normal sounding exhaust , on opening them they go to about 3 times the volume , on a motorway i can hardly here mine when it’s shut , i would still suggest cable or vacuum operated valves for better reliability , i tried a us supplier of good electric valves they lasted about a year , the vacuum ones have been on for about 4 years no issues and no maintenance needed , mine are welded into a modified back box , on my older ute i did find an electric valve that did work (via ebay ) it’s already made up into a sort of t piece with the cut out part of the t piece angled at about 45 degrees , that was welded in just after the cat , that one did work , they custom made an exhaust system for that , i just had one single big bore pipe rather than a pair running to the back box , if you pm me i will send you a clip if i can find it , i don’t want to post on here as it has the reg on display

[L2VXR]

99PBATR said:

How do they sound, open & closed?

That would again depend on what wortec you have and what you have it set to at the moment the 2005>Mk2 with the valves is no different to the manual spacer

https://youtu.be/g1DKgC6RfPs

If you have one of the earlier wortecs you would have to graft in some Y pipes of some sort in your prefered position and dump pre silencer which is a whole new kind off sound (marmite love/hate)

https://youtu.be/nEqnrVseY-Y

Edited by L2VXR on Wednesday 1st January 13:30

[99PBATR]

vxr2010 said:

basically closed they sound like a slightly loud but fairly normal sounding exhaust , on opening them they go to about 3 times the volume , on a motorway i can hardly here mine when it’s shut , i would still suggest cable or vacuum operated valves for better reliability , i tried a us supplier of good electric valves they lasted about a year , the vacuum ones have been on for about 4 years no issues and no maintenance needed , mine are welded into a modified back box , on my older ute i did find an electric valve that did work (via ebay ) it’s already made up into a sort of t piece with the cut out part of the t piece angled at about 45 degrees , that was welded in just after the cat , that one did work , they custom made an exhaust system for that , i just had one single big bore pipe rather than a pair running to the back box , if you pm me i will send you a clip if i can find it , i don’t want to post on here as it has the reg on display

Sent you a PM yesterday sir

[99PBATR]

Hmmm looks like I may have been wrong about me having a Wortec exhaust. I could have sworn that the receipts I have for the car said Wortec. In fact they say sports exhaust, headers and cats, so I am not actually sure what the make is now. I need to crawl under when she comes out of hibernation and have a look.

This is it from behind. (See pic)

When Walkinshaws fitted new CAT's to it last year, the pipework was listed as 2.5". I suspect I will need additional pipework to make this work. We shall see.

[Lincsls1]

Does look like a Wortec rear.

[L2VXR]

The wortec exhaust mk1 & mk2 seem to mostly have oval tail end finishers the quad round ones like mine were an option on the mk2 system (i think)
So you my well still have a wortec

[99PBATR]

Ahh I see. I must admit I was thinking all along it was but the paperwork doesn't say it. The exhaust Cats and headers were an eye watering amount of money by the looks of it...and that was in 2006

[L2VXR]

Googling monaro exhaust images turns up a good pic of a mk2 wortec showing the integrated valve

https://www.google.com/search?q=monaro+exhaust&amp...

[vxr2010]

i am assuming you got the reply to the pm you sent me re the clips

[vxr2010]

i was thinking headers and sports cats on the maloo but it’s a lot of £ , a cat back system is still a fair wack of £ but it does seem to have the desired noise effect , on mine the current original system is modded by both centre resonators being removed , and with different back boxes which does make it better plus it is still bimodal , the bimodal bit being great on a long journey , the standard exhaust came with bimodal but it’s way way too quiet , as on my post i was thinking of going big bore on the centre pipes but that’s going to be around 800£ and not even sure if it will be louder or a deeper noise .. decisions decisions plus £££ lol

[99PBATR]

vxr2010 said:

i am assuming you got the reply to the pm you sent me re the clips

Just checked and yes received one clip, so many thanks. Sounds amazing I must say, your UTE. Wish mine sounded as good! I assume that's with the butterfly's open?

[99PBATR]

L2VXR said:

Googling monaro exhaust images turns up a good pic of a mk2 wortec showing the integrated valve

https://www.google.com/search?q=monaro+exhaust&amp...

That great. Thanks fella, as I'm pretty sure that's exactly the set up I have on mine. I am running a Harrop supercharger on mine but based on receipts the pipework appears to be 2.5" not 3". I assume the measurement quoted for CAT's is the I.D not the O.D.

Having studied those pics, on the link, I assume on the Y Piece where you see the valve fitted, that opens the valve into one side of the rear silencer and when its shut, it diverts to another pipe but does that pipe vent to atmosphere? ie is it just open at the other (save the blanking plate in the end) to allow the gases out like the end of an exhaust pipe would but just bypassing the silencer?

It's a bit hard to tell from the pictures on that forum, what is on the other end of the Y pipe as you can't see. Is the set up like in the clip here?

https://www.youtube.com/watch?v=-Lo85NMDWa8

Edited by 99PBATR on Friday 3rd January 15:51