Perth-WRX.com  

Go Back   Perth-WRX.com > Technical > Mechanicals
Register Diddy Kart ArticlesAll AlbumsBlogs FAQ Members List Calendar Search Today's Posts Mark Forums Read


Welcome to Perth-WRX, click here to register!

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 03-03-2009, 01:04 PM
nachjoe's Avatar
Sir AntiLag
Member
 
Join Date: May 2007
Location: Perth
Posts: 335
Thanks: 4
Thanked 1 Time in 1 Post
nachjoe at standard level
Send a message via MSN to nachjoe
Default HKS Dump Pipe weird?

I have a HKS dump, nice looking ceramic coated even I think..but I noticed it has a open bell mouth like all aftermarker tbe's but this still has the flat blocked wastegate side flange like a stock dump? kinda weird isnt it? any thoughts on why this would be is appreciated...I know that the open mouth helps in many ways quicker spool cos of the lack of restriction better air flow blah blah

Im just wondering if I should change this before I get a retune with all the other mods im doing.

so looks like this

when I was expecting it to look like this


btw not my pics just so peeps that dont know what im on about can get a better idea.
Reply With Quote
  #2  
Old 03-03-2009, 01:14 PM
nauli's Avatar
Perth WRX Old Skool Cool Dude
Member
 
Join Date: Jul 2005
Location: Perth
Posts: 3,822
Thanks: 2
Thanked 66 Times in 61 Posts
nauli knows their stuff
Default

Looks like a waste of time to me....the best performing dump pipes generally run an open mouth with a wastegate venturi...I'm sure there are threads on this forum...
__________________
No Subarus currently owned
Reply With Quote
  #3  
Old 03-03-2009, 01:27 PM
Perth WRX Old Skool Cool Dude
Member
 
Join Date: Jul 2002
Location: Australia
Posts: 6,794
Blog Entries: 6
Thanks: 31
Thanked 49 Times in 35 Posts
BALISTC knows their stuff
Default

My brother-in-law's MY99 WRX made 280PS at the hubs, VF34, FMIC, Power FC and that style HKS dump pipe...1.4 bar.

It's apparently designed to place back-pressure on the wastegate, holding it closed for longer...and thus building boost faster.
Reply With Quote
  #4  
Old 03-03-2009, 01:47 PM
Kato's Avatar
Burnout!
Member
 
Join Date: Jul 2005
Location: Pimp Corner
Posts: 7,098
Thanks: 7
Thanked 120 Times in 75 Posts
Kato is a guruKato is a guru
Default

That top picture looks like a stock exhaust (shielding around it and stuff)?
__________________
[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]
Reply With Quote
  #5  
Old 03-03-2009, 02:20 PM
American Dave's Avatar
The Modulator
Member
 
Join Date: Jun 2006
Location: In your thread
Posts: 8,567
Blog Entries: 2
Thanks: 117
Thanked 104 Times in 90 Posts
American Dave is a guruAmerican Dave is a guru
Default

Quote:
Originally Posted by Kato
That top picture looks like a stock exhaust (shielding around it and stuff)?
agree
__________________
Funny looking German Subaru
Reply With Quote
  #6  
Old 03-03-2009, 02:50 PM
nachjoe's Avatar
Sir AntiLag
Member
 
Join Date: May 2007
Location: Perth
Posts: 335
Thanks: 4
Thanked 1 Time in 1 Post
nachjoe at standard level
Send a message via MSN to nachjoe
Default

yeh I did say 'btw not my pics just so peeps that dont know what im on about can get a better idea.' I have the same flange setup as that...covered wastegate exit but it is a HKS so no sheilding on it nor cat and its 3".

Thanks BALISTC makes sense maybe? might ask Sean when I call to book in see what his thoughts are.
Reply With Quote
  #7  
Old 03-03-2009, 03:00 PM
Kato's Avatar
Burnout!
Member
 
Join Date: Jul 2005
Location: Pimp Corner
Posts: 7,098
Thanks: 7
Thanked 120 Times in 75 Posts
Kato is a guruKato is a guru
Default

Ahh I see now.

Well I'd say the best dump pipe style to the worst would be:

1. Venturi wastegate
2. Seperate dump/wastegate pipes
3. Bell mouth
4. Dump blanked wastegate
5. Stock

This is just my opinion only for getting max power. There are also other pro's/con's for each style and it depends on your goal and other mods to make the decision.
__________________
[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]
Reply With Quote
Reply

Tags
dump, hks, pipe, weird

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On




Welcome to Perth-WRX, click here to register!

All times are GMT +8. The time now is 02:16 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO