Notices
Prefabbed Turbo Kits A place to discuss prefabricated turbo kits on the market

Where does the Greddy TD04H-15G fit in?

Thread Tools
 
Search this Thread
 
Old Apr 3, 2009 | 05:27 AM
  #21  
lloydie's Avatar
Newb
 
Joined: Dec 2004
Posts: 27
Total Cats: 0
Default

The x-axis represents the amount of air the turbo is shifting, normally expressed in cfm (just not on that map!!). Maybe this adjusted version of thats same compressor map will be easier to read :

Old Apr 3, 2009 | 06:41 AM
  #22  
ThePass's Avatar
Thread Starter
Supporting Vendor
iTrader: (3)
 
Joined: Jul 2006
Posts: 3,310
Total Cats: 1,236
From: San Diego
Default

ohhhh. ok so then how do I know where on the x-axis a given car falls? What determines if at .6 bar I am producing 215 cfm (75% efficiency) or 300 cfm (70% efficiency)?
__________________
Ryan Passey
Old Apr 3, 2009 | 07:57 AM
  #23  
BradC's Avatar
Junior Member
iTrader: (6)
 
Joined: Jun 2008
Posts: 458
Total Cats: 3
From: Lansdale, PA
Default

Originally Posted by ThePass
ohhhh. ok so then how do I know where on the x-axis a given car falls? What determines if at .6 bar I am producing 215 cfm (75% efficiency) or 300 cfm (70% efficiency)?
Superhachi.com - Compressor Map Tutorial

The Y axis isn't boost pressure in BAR either, it is pressure ratio. The pressure ratio is:

(boost pressure (in psi) + inlet pressure (14.7 @ sea level) + IC losses) / inlet pressure.
Old Apr 3, 2009 | 08:44 AM
  #24  
Braineack's Avatar
Boost Czar
iTrader: (62)
 
Joined: May 2005
Posts: 80,552
Total Cats: 4,368
From: Chantilly, VA
Default

Stealth 316 - Turbocharger Compressor Flow Maps

TurboByGarrett.com - Turbo Tech103
Old Apr 3, 2009 | 08:46 AM
  #25  
Braineack's Avatar
Boost Czar
iTrader: (62)
 
Joined: May 2005
Posts: 80,552
Total Cats: 4,368
From: Chantilly, VA
Default

Originally Posted by ThePass
ohhhh. ok so then how do I know where on the x-axis a given car falls? What determines if at .6 bar I am producing 215 cfm (75% efficiency) or 300 cfm (70% efficiency)?

that's not how you read a compressor map.

at 14psi from 3000-7000RPM you could travel through the entire heat efficiency island of the turbo depending on the volume air flow produced.
Old Apr 3, 2009 | 08:53 AM
  #26  
Braineack's Avatar
Boost Czar
iTrader: (62)
 
Joined: May 2005
Posts: 80,552
Total Cats: 4,368
From: Chantilly, VA
Default

Originally Posted by BradC
Superhachi.com - Compressor Map Tutorial

The Y axis isn't boost pressure in BAR either, it is pressure ratio. The pressure ratio is:

(boost pressure (in psi) + inlet pressure (14.7 @ sea level) + IC losses) / inlet pressure.

good thing you mentioned that, I was about to correct.

easy formula is 14.7 + boost / 14.7 = PR
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
bigmackloud
Miata parts for sale/trade
19
Jan 8, 2021 11:24 AM
nbdooey
Miata parts for sale/trade
9
Aug 30, 2017 09:50 PM
Corky Bell
Prefabbed Turbo Kits
18
Nov 22, 2016 09:01 PM
Frank_and_Beans
Supercharger Discussion
13
Sep 12, 2016 08:17 PM




All times are GMT -4. The time now is 09:18 AM.