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Location:
North Sydney
Registered:
May 2002
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 Dual port external wastegate advantages over single port?
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Fri, 22 November 2002 06:29
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Just wondering how much of an advantage the dual port wastegates have over the single port?
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Location:
North Sydney
Registered:
May 2002
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Re: Dual port external wastegate advantages over single port?
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Sun, 24 November 2002 04:28
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Cmon, i know alot of guys out there think they know everything...
Impress me!
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Location:
Wollongong
Registered:
July 2002
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Re: Dual port external wastegate advantages over single port?
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Sun, 24 November 2002 07:06
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fully seeekk noize to impress all da chiks maaate! 
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Location:
North Sydney
Registered:
May 2002
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Re: Dual port external wastegate advantages over single port?
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Sun, 24 November 2002 11:12
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Its an external wastegate dork, it doesn't "make a noise to impress the chicks maaaaaaaaate".
I was hoping for someone who actually thinks they know something not someone who definitly doesn't know anything!
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Location:
Sydney
Registered:
May 2002
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Re: Dual port external wastegate advantages over single port?
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Sun, 24 November 2002 11:33
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paul, does it have a greater passage area??
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Dual port external wastegate advantages over single port?
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Sun, 24 November 2002 21:56
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Are you talking about the CT26s with the 'twin' wastegate?
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Location:
North Sydney
Registered:
May 2002
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Location:
Wollongong
Registered:
July 2002
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Re: Dual port external wastegate advantages over single port?
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Mon, 25 November 2002 07:43
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definately doesn't know anything eh?
yeah its hard being this dumb...my excuse? I was tired got bov and wastegate fucked up.
Oh hows that coil going? Get all the shit fixed with that other one?
Thats right it was stupid me that gave you that coil you f****ing twat.
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: Dual port external wastegate advantages over single port?
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Mon, 25 November 2002 09:59
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 Thats farkin funny
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Location:
North Sydney
Registered:
May 2002
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Re: Dual port external wastegate advantages over single port?
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Mon, 25 November 2002 12:36
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I fully apologise, sorry mate. Just a little tired myself too. Just so many ppl don't know the difference between a wastegate and a blow off valve!
And a little sick of the "fully sick one's" and the stigma that gets put onto me because I drive a turbo car. They assume I come from Fairfield, and have a blow valve for the sole purpose of that "psssssshhhhhhhht" predestrian scarer and chick attention puller.
If i had a choice my blow off valve wouldn't make a noise and create as little attention as possible, i hate attention seekers.
There's a few ppl on here that have got no idea^.
Once again I formally apologise to you.
How's the FJ project going?
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Registered:
June 2002
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Re: Dual port external wastegate advantages over single port?
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Mon, 25 November 2002 21:20
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All the externals I've seen have the 2 vacumn/boost attachments, 1 either side of the diaphram.
I think the Apexi Type S BOV also has 2 vacumn attachments!?!?
Maybe it has something to do with the response time/control of the WG, ie. opens quicker & holds boost better!?!?!?
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Location:
North Sydney
Registered:
May 2002
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Re: Dual port external wastegate advantages over single port?
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Tue, 26 November 2002 10:05
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But the ports are definitely on either side of the diaphram. I pulled it apart, so it's couldn't be for faster response but perhaps better boost control. Maybe thats it.
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Location:
Mildura
Registered:
May 2002
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Re: Dual port external wastegate advantages over single port?
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Tue, 26 November 2002 11:58
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My understanding is that the one on the underside of the diaphram goes dirrectly to a boost source and the other is left open to atmosphere when not running a boost controller.
When running a boost controller the other is attached to the controller in the normal manner.
I have a diagram of it somewhere posted by Pete from another post.
marty
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Location:
North Sydney
Registered:
May 2002
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Re: Dual port external wastegate advantages over single port?
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Wed, 27 November 2002 01:59
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Kewl, is that HKSPete?? That's how i've hooked it up cause that's how i got it off Pete, but i'm just interested in the logic for this other port when using an electronic boost controller as I am.
It must be for smoother boost control.
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Location:
Mildura
Registered:
May 2002
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Re: Dual port external wastegate advantages over single port?
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Wed, 27 November 2002 05:56
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No TRD Kingswood Pete.
I think its got more to do with fooling the spring in the gate by applying more than atmospheric pressure to the other side of the diaphram,thus increasing its release point.
marty
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Location:
Wollongong
Registered:
July 2002
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Re: Dual port external wastegate advantages over single port?
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Wed, 27 November 2002 10:09
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apology accepted..I was possibly a little touchy...
the fj project...there has been a slight spanner developed there..namely a friend of mine offered to sell me his car that I have been drooling over since I was 14...its a (oh boy) XA falcon wagon. In its favour, its custom from one end to the other and has somewhere over 400hp at the wheels and was last insured for 38k. But its a reasonably price for what it is..decisions decisions.
What did you end up doing with your other car anyway?
why do i feel that I am going to be disowned by a whole load of toyota people now?!! 
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Location:
North Sydney
Registered:
May 2002
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Re: Dual port external wastegate advantages over single port?
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Wed, 27 November 2002 12:56
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I got the car running again and then my mate wrote it off on a Toymods cruise just past Wiseman's Ferry or was that Poorman's Ferry?
Into a tree at 80km/h spun 180deg and into a telegraph pole!!! Wasn't too happy about that. But ive undertaken a new project with a new red mk2. Should be better than the old.
We won't hold it against you if you drop in a 2jz with a dual ball bearing turbo between the towers!!!!! 
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Location:
Wollongong
Registered:
July 2002
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Re: Dual port external wastegate advantages over single port?
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Thu, 28 November 2002 06:54
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I knew about the mate writing it off..I was wondering how you went with that actually, cause that really sucked!
so whats this replacement?
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Location:
Wollongong
Registered:
July 2002
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Re: Dual port external wastegate advantages over single port?
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Thu, 28 November 2002 10:12
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hey lookit i found piccy of the supra! before i broke all the wheels!
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Location:
Wollongong
Registered:
July 2002
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Re: Dual port external wastegate advantages over single port?
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Thu, 28 November 2002 10:15
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hey why this piccy for my name not post? aaah should have read the fine print..has to be approved..stoopid meee
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Location:
North Sydney
Registered:
May 2002
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Re: Dual port external wastegate advantages over single port?
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Thu, 28 November 2002 11:29
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Same thing, red mk2 supra just converted it to manual and now to 3lt turbo!!
Should go pretty nicely. A healthy power to weight ratio compared to heavier supras.
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Location:
Wollongong
Registered:
July 2002
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Re: Dual port external wastegate advantages over single port?
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Fri, 29 November 2002 09:56
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speaking of 3litre turbos, i heard of a guy in wollongong recently who has an american 2jz in his shed.....the bastard!
My piccies there now! yaay me..hehe
what sort of boost/mods you planning?
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Location:
North Sydney
Registered:
May 2002
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Re: Dual port external wastegate advantages over single port?
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Fri, 29 November 2002 11:13
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An americanone would be nice!!! Wonder if the american 1jz gets the decent non-explosive turbines?
I'm still going to run the same boost, don't want to run any more just do things to get more out of it at the same boost.
Ill run a HKS manifold, T04E and 32mm external wastegate, microtech. Should produce some pretty big numbers.
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Location:
Wollongong
Registered:
July 2002
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Re: Dual port external wastegate advantages over single port?
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Sat, 30 November 2002 01:09
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http://www.mkiv.co.nz/specs.htm no idea about the 1j
The hks manifold, its the same as the original right? Have you considered shortening the inlet tract? I figured that if I modded the inlet to be something similar to a 1jz,run a 'cooler with inlet and oulet on different sides as opposed to the stocker, i could shave near a metre off the inlet length and the increase in throttle response would be huuuge.
Getting it done at a specialist shop was going to be expensive but thats cause they added internal trumpets and all sorts of stuff. There are much cheaper ways. The throttle body would be buried down the left side of the engine somewhere as the 'cooler piping would ahve to be run under the aircon pump i think it is over there, but it should work well.
Just an idea.
Why microtech? From what I'm told ems is about as good as it gets without going motec
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Location:
Mildura
Registered:
May 2002
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Re: Dual port external wastegate advantages over single port?
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Sat, 30 November 2002 08:11
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Give me a week and I'll post some pics of a 1jz intake on the 7m.
Could of had it bolted up today but spotted a little bit of weld missed.
marty
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Location:
North Sydney
Registered:
May 2002
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Re: Dual port external wastegate advantages over single port?
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Sun, 01 December 2002 05:40
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No the HKS one is way different to the stocker one. It's alot better for flow and has an external wastegate adaptor on it.
Also the wastegate is plumbed off cylinder 5 & 6 which is alot better as is reduces the thermal stress on the back(hotter) cylinders giving them better breathing whilst on boost. This should also give the head gasket a break for those sceptical people.
I've already got the intercooler piping coming off the intercooler on the inlet side of the car. I made it like that originally cause as you you say there is alot of "extra" piping like a metre long that dampens throttle response. Mines also 2.5inch and is ceramic coated inside and out.
I've got a spare intake manifold that i'm modifying at the moment, don't want to loose too much drivability but the better flowing exhaust manifold should give me some back for the bottom end
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Location:
Wollongong
Registered:
July 2002
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Re: Dual port external wastegate advantages over single port?
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Mon, 02 December 2002 05:08
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so you have a spare exhaust as well?
is there anything you don't have?!!! I didn't realise that hks made a complete manifold for the 7mgte
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Location:
Canberra
Registered:
May 2002
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Re: Dual port external wastegate advantages over single port?
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Mon, 02 December 2002 21:30
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Back to the wastegate thing, I just found this:
"This 45mm waste gate is of compact design and features an attractive billet aluminium diaphragm cover. Standard spring pressure is set at 9 PSI and features a port in the top of the diaphragm cover to increase boost through plumbing pressure back on top of the wastegate."
On a sales website. Perhaps you're supposed to run manifold pressure via a bleed valve to the other port....
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Location:
North Sydney
Registered:
May 2002
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Re: Dual port external wastegate advantages over single port?
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Tue, 03 December 2002 02:46
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Thanks for the info but that extract only talks about the port on top of the diaphram not the extra port on the other side of the diaphram as mine has.
Cheers anyways Ben
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Location:
Canberra
Registered:
May 2002
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Re: Dual port external wastegate advantages over single port?
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Thu, 05 December 2002 21:26
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I assumed they meant for you to plumb manifold pressure to the 'opening' port as poer usual, then you can run a bleeder valve or similar to the other one to provide boost control. Why this would be an advantage over a conventional setup I'm not sure.
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I supported Toymods
Location:
Brisbane, QLD
Registered:
May 2002
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Re: Dual port external wastegate advantages over single port?
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Fri, 06 December 2002 00:26
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Paul,
Could it be to differentiate the operation between absolute pressure mode and relative pressure mode?
I know that boys in certain racing circles tend to do their boost control relative to the atmospheric pressure (to eliminate adverse effects of running in a lower atmospheric pressure situations such as which you might find in a hill climb).
Maybe the dual port design is so that you can utilize the second port as a reference pressure input to do similar relative boost pressure control....
Cheers
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Location:
North Sydney
Registered:
May 2002
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Re: Dual port external wastegate advantages over single port?
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Sat, 07 December 2002 09:59
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I think thats it son!!!!
Thats the most logical reason so far. I think your right! Rather than just seeing the manifold pressure it relates it to the absolute, yep thats gotta be it!
Cheers Nishad
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