Performance and Tuning Discussion forum for various performance tuning techniques and questions

Theoretical best fit? Turbo experts opinions invited

Thread Tools
 
Search this Thread
 
Old 06-23-2005, 07:28 PM
  #1  
AudiWorld Super User
Thread Starter
 
A400's Avatar
 
Join Date: Sep 2003
Posts: 3,931
Likes: 0
Received 0 Likes on 0 Posts
Default Theoretical best fit? Turbo experts opinions invited

If someone was trying to get 50 or so lbs of air from a turbo where the turbo pressure ratio was around 2.1 and wanted some effeciency in the fat spot of 20-30lbs boost - 4000-6500 rpm.
Heres the question
Do the turbo experts out there think a big GT30, a small GT35 or even a tiny GT40 would work with 2 litres built to the hilt to pump the turbine with? I have cruised some sites, have an idea of how to read a map and plot critical points, but the different gyrations of the Garretts have me stumped. I like the BB turbos. I have no intentions of changing at this point but would like someone to point me in a general direction.
TIA
Rod
Old 06-24-2005, 04:13 AM
  #2  
WJM
AudiWorld Super User
 
WJM's Avatar
 
Join Date: Mar 2000
Posts: 13,474
Likes: 0
Received 1 Like on 1 Post
Default

quick answer: 2L eclipses spool that size turbo all the time
Old 06-24-2005, 10:10 AM
  #3  
Member
 
Stratocaster1422's Avatar
 
Join Date: Jan 2003
Posts: 5,366
Likes: 0
Received 0 Likes on 0 Posts
Default my friend bill has a 65lb wheel on his talon....

he was getting around 50lb/min at 5K-5500 at at 25psi when it was a stock 2.0L, and now that he has the 2.4L stroker in, he's getting the same flow at 17psi and at 4K RPM. This is all on a GT14 turbo.

Flowing 50lb/min at that pressure is going to take a while to kick in even at 2L. The power is like an on/off switch.
Old 06-24-2005, 11:46 AM
  #4  
AudiWorld Super User
Thread Starter
 
A400's Avatar
 
Join Date: Sep 2003
Posts: 3,931
Likes: 0
Received 0 Likes on 0 Posts
Default

elaborate please. Turbo spools to quick or 2 slow - I thought 2 slow
Old 06-24-2005, 04:18 PM
  #5  
WJM
AudiWorld Super User
 
WJM's Avatar
 
Join Date: Mar 2000
Posts: 13,474
Likes: 0
Received 1 Like on 1 Post
Default too is subjective... the bigger the turbo the more it will take to spool fully

but half spooled still equals a lot of air.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
TT2Cabo
TT (Mk1) Discussion
2
06-15-2009 12:13 PM
selfproclaimedv8buff
Southeast Discussion
4
06-16-2004 06:44 AM
aielloS4 | .:HBC
Audi Original "S" Cars
16
07-31-2003 03:43 AM
DoubleClutch
A4 (B5 Platform) Discussion
3
06-14-2000 07:32 AM



Quick Reply: Theoretical best fit? Turbo experts opinions invited



All times are GMT -8. The time now is 01:12 PM.