EvolutionM - Mitsubishi Lancer and Lancer Evolution Community

Notices
Evo X Engine Management / Tuning Forums Discuss the major engine management systems.

What would be the recommended cut off amount of boost for a stock turbo?

Thread Tools
 
Search this Thread
 
Old Jul 14, 2010, 11:19 PM
  #1  
Evolved Member
Thread Starter
iTrader: (9)
 
Methodical4u's Avatar
 
Join Date: Jul 2006
Location: Maryland
Posts: 2,815
Received 1 Like on 1 Post
What would be the recommended cut off amount of boost for a stock turbo?
I'm just wondering... do people stop at 25-27 psi a lot because the engine needs more fuel or because the turbo itself can't handle much more than this?
Methodical4u is offline  
Reply Like
Old Jul 15, 2010, 12:50 AM
  #2  
Newbie
 
brandon1878's Avatar
 
Join Date: Jul 2009
Location: Peoria
Posts: 1
Likes: 0
Received 0 Likes on 0 Posts
i got mine tuned by dyno comp and they take it to the highest but safest boost and it was at 19psi...
brandon1878 is offline  
Reply Like
Old Jul 15, 2010, 02:01 AM
  #3  
EvoM Guru
iTrader: (6)
 
tephra's Avatar
 
Join Date: Feb 2007
Location: Melbourne, Australia
Posts: 9,486
Received 66 Likes on 42 Posts
depends on what you are doing and what fuel your running and what gear

circuit racing (any fuel) = 21psi
drag/street (91oct) = 23psi
drag/street (93oct) = 24psi
drag/street (e85/meth) = 28psi

i generally run +1psi in 1st-3rd...
tephra is offline  
Reply Like
Old Jul 15, 2010, 02:45 AM
  #4  
Evolving Member
 
onboost's Avatar
 
Join Date: Jun 2007
Location: New Zealand
Posts: 109
Likes: 0
Received 0 Likes on 0 Posts
i run 26 - 28psi on nz 98ron. usually no knock etc. and thats on just a gsr with an invidia catback
onboost is offline  
Reply Like
Old Jul 15, 2010, 08:45 AM
  #5  
EvoM Community Team
iTrader: (15)
 
fostytou's Avatar
 
Join Date: Sep 2006
Location: Aurora, IL
Posts: 3,143
Received 6 Likes on 6 Posts
Above 22 psi or so the stock turbo becomes very inefficient and may create more boost, but mostly by way of hot air that heat soaks an intercooler much more quickly. If the intercooler is heatsoaked or the air cannot be cooled, it causes pre ignition / detonation once it reaches the engine.
fostytou is offline  
Reply Like
Old Jul 15, 2010, 01:13 PM
  #6  
Evolved Member
Thread Starter
iTrader: (9)
 
Methodical4u's Avatar
 
Join Date: Jul 2006
Location: Maryland
Posts: 2,815
Received 1 Like on 1 Post
Originally Posted by fostytou
Above 22 psi or so the stock turbo becomes very inefficient and may create more boost, but mostly by way of hot air that heat soaks an intercooler much more quickly. If the intercooler is heatsoaked or the air cannot be cooled, it causes pre ignition / detonation once it reaches the engine.
I'm running the ETS 4" IC so the heat soak wouldn't be as big a concern as if I was just running the stock setup.
Methodical4u is offline  
Reply Like
Old Jul 15, 2010, 01:17 PM
  #7  
Evolved Member
Thread Starter
iTrader: (9)
 
Methodical4u's Avatar
 
Join Date: Jul 2006
Location: Maryland
Posts: 2,815
Received 1 Like on 1 Post
Originally Posted by brandon1878
i got mine tuned by dyno comp and they take it to the highest but safest boost and it was at 19psi...
19psi? What the hell kind of tuner are they?
Methodical4u is offline  
Reply Like

Trending Topics

Old Jul 15, 2010, 01:39 PM
  #8  
Evolving Member
iTrader: (4)
 
E6-X's Avatar
 
Join Date: Sep 2009
Location: earth
Posts: 482
Likes: 0
Received 0 Likes on 0 Posts
it's not only a matter of safe or not.
the turbo efficiency counts too and whats the point of having too much boost if it's out of the compressor efficiency range ?
i would say 26 psi tapering to 19 psi depending on mods/weather/etc would be a good range for stock turbo on pump.
E6-X is offline  
Reply Like
Old Jul 15, 2010, 01:51 PM
  #9  
Evolved Member
iTrader: (49)
 
Kracka's Avatar
 
Join Date: Apr 2007
Location: Prosper, TX
Posts: 8,970
Received 17 Likes on 15 Posts
Originally Posted by E6-X
i would say 26 psi tapering to 19 psi would be a good range for stock turbo on pump.
This is exactly what I'm planning for my car next week when I get tuned (93 octane).
Kracka is offline  
Reply Like
Old Jul 15, 2010, 02:01 PM
  #10  
Newbie
 
EvoGuy5's Avatar
 
Join Date: Mar 2010
Location: Akron, Ohio
Posts: 17
Likes: 0
Received 0 Likes on 0 Posts
19 psi...that's a built SRT-4 max range. I'm on a stock VIII turbo (9.8 cm) tuned to peak 25 psi, IX turbo (10.5 cm) will handle 26-27 psi efficiently.
EvoGuy5 is offline  
Reply Like
Old Jul 15, 2010, 08:14 PM
  #11  
Evolved Member
Thread Starter
iTrader: (9)
 
Methodical4u's Avatar
 
Join Date: Jul 2006
Location: Maryland
Posts: 2,815
Received 1 Like on 1 Post
Originally Posted by E6-X
it's not only a matter of safe or not.
the turbo efficiency counts too and whats the point of having too much boost if it's out of the compressor efficiency range ?
i would say 26 psi tapering to 19 psi depending on mods/weather/etc would be a good range for stock turbo on pump.
so if you have a 3 port and an upgraded BOV, and it tapers to say 22 psi... what's wrong with that?
Methodical4u is offline  
Reply Like
Old Jul 15, 2010, 08:22 PM
  #12  
Evolved Member
iTrader: (2)
 
gunzo's Avatar
 
Join Date: Oct 2002
Location: Somewhere
Posts: 1,328
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by Methodical4u
so if you have a 3 port and an upgraded BOV, and it tapers to say 22 psi... what's wrong with that?
nothing wrong .. 21-22 psi on stock turbo at 7000rpms is about the max you can go anyways ..

22psi is where the temperatures between the inlet and outlet starts to diverge by alot more .. meaning its going way beyond the stock turbo efficiency
gunzo is offline  
Reply Like
Old Jul 15, 2010, 08:22 PM
  #13  
Evolving Member
iTrader: (4)
 
MyEvo8Urs's Avatar
 
Join Date: Dec 2009
Location: Dearborn Heights, Michigan
Posts: 166
Likes: 0
Received 0 Likes on 0 Posts
1 Million!!!! Muaaaaahhhahahaha!
MyEvo8Urs is offline  
Reply Like
Old Jul 15, 2010, 08:41 PM
  #14  
Newbie
iTrader: (19)
 
2.4evo's Avatar
 
Join Date: Oct 2007
Location: Jacksonville
Posts: 83
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by Methodical4u
19psi? What the hell kind of tuner are they?
lol,thats what I was thinking
2.4evo is offline  
Reply Like
Old Jul 15, 2010, 08:42 PM
  #15  
Evolved Member
Thread Starter
iTrader: (9)
 
Methodical4u's Avatar
 
Join Date: Jul 2006
Location: Maryland
Posts: 2,815
Received 1 Like on 1 Post
Originally Posted by gunzo
nothing wrong .. 21-22 psi on stock turbo at 7000rpms is about the max you can go anyways ..

22psi is where the temperatures between the inlet and outlet starts to diverge by alot more .. meaning its going way beyond the stock turbo efficiency
oh I see... well I understand very little about the mechanical side of things... I mean I get it, but some of the stuff just takes a while to register lol... a side effect of panic disorder medicine I think.
Methodical4u is offline  
Reply Like



Advanced Search
Quick Reply: What would be the recommended cut off amount of boost for a stock turbo?


Reply Closed Thread Share

All times are GMT -7. The time now is 05:35 AM.