The Subaru SVX World Network   SVX Network Forums
Live Chat!
SVX or Subaru Links
Old Lockers
Photo Post
How-To Documents
Message Archive
SVX Shop Search
IRC users:

Go Back   The Subaru SVX World Network > SVX Main Forums > MOD Mania > Turbo Projects

Reply
 
Thread Tools Rate Thread Display Modes
  #46  
Old 06-27-2007, 10:19 AM
longassname's Avatar
longassname longassname is offline
Just some dude.
 
Join Date: Sep 2002
Location: Miami, FL
Posts: 3,986
Significant Technical Input
12psi is not 12psi nor 12psi nor 12psi. The mass of air pushed is what matters. Pressure is used and talked about because it's easy to measure; however, temperature has a huge effect on the mass of air that a given pressure in a given volume indicates.

12psi and below is the range where you don't really need intercooling or aftercooling. You can cool any forced induction air charge. The piece of hardware used with turbos is called and intercooler the piece of hardware used with superchargers is called an aftercooler. 6 of 1 half a dozen of the other.

If you have a system running 12psi of boost and you throw an intercooler or aftercooler on it your manifold pressures will drop. That 12 psi will be more like 8 psi. It's still pushing about the same amount of air; the air is just cooler now. So now you are making about the same power but your boost gauge shows 8 psi instead of 12.

As far as the comparisons between superchargers and turbos when not cooling the aircharge..it depends on the supercharger and turbo. A centrifugal supercharger is about the same as a turbo. A twin screw supercharger is much more efficient so the same amout of boost from a twin screw charger is more air than the same amount from a turbo or centrifugal. A roots blower is more efficient than most turbos below around 8 psi and less efficient above that. With turbos and centrifugals the efficiency varies widely depending on the matching of the turbo to the size of the engine as well. In practice it's pretty complicated.

Quote:
Originally Posted by Nomad
I was reading and wondered : Is 12psi super charge same power of 12psi turbo ? But , only turbo offers intercooled option ?
Reply With Quote
  #47  
Old 06-27-2007, 08:07 PM
SVX_Smoke_Out SVX_Smoke_Out is offline
Registered User
 
Join Date: May 2004
Location: Odess, Texas
Posts: 43
Send a message via AIM to SVX_Smoke_Out
Been awhile since i poseted but i got a few questions. So whats the deal with the rear mounted turbos think they would work good on the SVX. Only thing im not sure about is the spool is it going to be laging because of the amount of tubing to be used for a rear mount setup?
Reply With Quote
  #48  
Old 06-27-2007, 08:53 PM
sicksubie's Avatar
sicksubie sicksubie is offline
Registered User
Subaru Bronze Contributor
 
Join Date: Nov 2004
Location: Holden, MA or the White Mountains
Posts: 3,812
Send a message via ICQ to sicksubie Send a message via AIM to sicksubie Send a message via Skype™ to sicksubie
Been discussed....... not a good option
__________________
Former:
1994 Barcelona Red(x2), 1995 Brilliant Red, 1992 Liquid Silver, 1992 Ebony(x2), 1992 Pearl White (x2)
Current:
2017 Ford Raptor
2017 Kawasaki KLR
1995 Guards Red Carrera
1995 Spec-ish Miata - track car
1957 CJ-5
Reply With Quote
  #49  
Old 06-28-2007, 09:08 AM
Nomad Nomad is offline
The car named NIGHTMARE
 
Join Date: Jan 2005
Location: Trois-Rivieres , Québec
Posts: 304
Send a message via MSN to Nomad
ok , thanx , now im starting to understand !
__________________
Nightmare is the name of the car...
Reply With Quote
  #50  
Old 07-18-2007, 11:54 AM
XT6Wagon XT6Wagon is offline
Registered User
 
Join Date: May 2007
Location: Vancouver, WA
Posts: 417
Mmm, missed the rear mount turbo question. Yes, rear mount turbos work. You are NOT going to get razor sharp response times, but you will get a good bit of extra power.

They work, and they will work well enough to blow the stock motor to pieces from too much boost/power. In someways they are safer than normal placed turbos since you typicly don't get the turbocharger "running away", or pressure spikes that can do **** like bend throttle plates. On the otherhand, lighting off a turbo such that its operating as a "jet engine" gets some stupid fast spool times and huge torque, so if you want to autoX, or break drivetrains, a close mount turbo is definitely the way to go.

However, its not that hard to use a more traditional subaru turbo position with most reasonable sized turbos, so might as well do that instead of re-inventing the wheel as it were.

Last edited by XT6Wagon; 07-18-2007 at 12:09 PM.
Reply With Quote
  #51  
Old 06-25-2008, 11:12 AM
SubaruSVXCrazy's Avatar
SubaruSVXCrazy SubaruSVXCrazy is offline
AWD..... NOTHING COMES CLOSE
 
Join Date: Aug 2005
Location: Mahopac, New York
Posts: 839
Send a message via AIM to SubaruSVXCrazy
Re: Turbo options?

I just jacked a stock IHI RHB5 out of an 87 GL-10. If I rebuild it, could I use it?
__________________
1992 Subaru SVX LS-L #5045 Dark Teal
1992 Subaru Loyale Wagon Gray (SOLD)
1999 Subaru Impreza 2.5RS Coupe Black Ruby (SOLD)
1969 Subaru 360 Deluxe Ivory White
2005 Subaru Impreza WRX STi World Rally Blue
1993 Subaru Legacy L Wagon Teal Metallic (SOLD)
1998 Subaru Impreza 2.5RS Coupe Rally Blue Pearl


[SIGPIC][/SIGPIC]
Reply With Quote
  #52  
Old 06-25-2008, 06:28 PM
RallyBob's Avatar
RallyBob RallyBob is offline
Registered fabricator
 
Join Date: Feb 2008
Location: Pleasant Valley, CT
Posts: 277
Re: Turbo options?

Quote:
Originally Posted by SubaruSVXCrazy View Post
I just jacked a stock IHI RHB5 out of an 87 GL-10. If I rebuild it, could I use it?
On your lawnmower perhaps.....

A bit too small for an SVX. Unless you run 4 of them.
__________________
Bob Légère

EG33 Impreza tweaks
Reply With Quote
  #53  
Old 06-25-2008, 09:45 PM
SubaruSVXCrazy's Avatar
SubaruSVXCrazy SubaruSVXCrazy is offline
AWD..... NOTHING COMES CLOSE
 
Join Date: Aug 2005
Location: Mahopac, New York
Posts: 839
Send a message via AIM to SubaruSVXCrazy
Re: Turbo options?

Quote:
Originally Posted by RallyBob View Post
On your lawnmower perhaps.....

A bit too small for an SVX. Unless you run 4 of them.
LOL,
__________________
1992 Subaru SVX LS-L #5045 Dark Teal
1992 Subaru Loyale Wagon Gray (SOLD)
1999 Subaru Impreza 2.5RS Coupe Black Ruby (SOLD)
1969 Subaru 360 Deluxe Ivory White
2005 Subaru Impreza WRX STi World Rally Blue
1993 Subaru Legacy L Wagon Teal Metallic (SOLD)
1998 Subaru Impreza 2.5RS Coupe Rally Blue Pearl


[SIGPIC][/SIGPIC]
Reply With Quote
  #54  
Old 06-26-2008, 07:43 AM
TomsSVX's Avatar
TomsSVX TomsSVX is offline
Maniac modifier
 
Join Date: Dec 2003
Location: Branchburg, New Jersey
Posts: 15,489
Registered SVX Classic SVX
Re: Turbo options?

Quote:
Originally Posted by RallyBob View Post
On your lawnmower perhaps.....

A bit too small for an SVX. Unless you run 4 of them.
LOL Eric said those exact words yesterday

Tom
Reply With Quote
  #55  
Old 07-14-2008, 10:48 PM
Roo Roo is offline
Registered User
 
Join Date: May 2004
Location: Between the redwoods and the vineyards
Posts: 208
Send a message via AIM to Roo Send a message via Yahoo to Roo
Re: Turbo options?

Quote:
Originally Posted by SubaruSVXCrazy View Post
I just jacked a stock IHI RHB5 out of an 87 GL-10. If I rebuild it, could I use it?
Quote:
Originally Posted by RallyBob View Post
On your lawnmower perhaps.....

A bit too small for an SVX. Unless you run 4 of them.
Hmm, that gives me an idea...

Individual IHI RHB5 turbos...one for each cylinder!!!

__________________
'92 SVX LS-L
Project Car for Open Road Racing
Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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

Forum Jump


All times are GMT -6. The time now is 06:09 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
© 2001-2015 SVX World Network
(208)-906-1122