Up pipe, 3 point boost control? - Page 2
Page 2 of 2 FirstFirst 12
Results 16 to 26 of 26

This is a discussion on Up pipe, 3 point boost control? within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; I ran my 16G-XT 22 psi to redline no problem on 93 octane. Same with my 18G. Sent from my ...

  1. #16
    Moderator Donkey's Avatar
    Join Date
    Apr 2005
    Location
    Da boonies
    Posts
    6,095
    I Support ClubWRX

    Up pipe, 3 point boost control?

    I ran my 16G-XT 22 psi to redline no problem on 93 octane. Same with my 18G.


    Sent from my magic banana
    Resident Adviser @ WTF Tuning, LLC
    2002 FORESTER S
    1998 FORESTER S




  2. Remove Advertisements
    ClubWRX.net
    Advertisements
     

  3. #17
    zax
    zax is offline
    ¯\_(ツ)_/¯ zax's Avatar
    Join Date
    Nov 2008
    Location
    Neverland Ranch, Maryland
    Posts
    12,919
    I Support ClubWRX I Support ClubWRX
    I ran my redline to 35 PSI.
    2015 CWP WRX STi ... But how did I get roped back into an EJ motor?!
    Zax's utterly unimaginably stock 2015 STi build thread
    Zax's Shaggin' Wagon Build Thread Now tuned for 99% pure Unicorn Jizz!

    Zach | Moderator -- Mid-Atlantic States, Tech & Modifying & General Repairs
    Rollin' with the Bugeye Mafia #302 | N.E.R.D. Subject Zero
    Facebook me here

    Your Mid-A local board: http://www.clubwrx.net/forums/mid-atlantic-states/

  4. #18
    Moderator Donkey's Avatar
    Join Date
    Apr 2005
    Location
    Da boonies
    Posts
    6,095
    I Support ClubWRX

    Up pipe, 3 point boost control?

    Quote Originally Posted by zax View Post
    I ran my redline to 35 PSI.
    I ran my blueline to 3500ft


    Sent from my magic banana
    Resident Adviser @ WTF Tuning, LLC
    2002 FORESTER S
    1998 FORESTER S




  5. #19
    Pro Manscaper Mikie13's Avatar
    Join Date
    Oct 2006
    Location
    Palmyra, NJ
    Posts
    20,805
    Quote Originally Posted by zax View Post
    Definitely. Buy a 3-port and I'll help tune.
    Goddamnit Mod bug itching again....
    The Hawk-Eye Alliance #90|The Blobeye Syndicate #0|The Stink-Eye Mob #0|N.E.R.D. Founding Member & #3
    2012 Lightning Red WRX Sedan Stock...for now Soon to be OpenSource tuned by: Mattypants @ WTF Tuning
    "If I have 10 ice cubes and you have 11 giraffes, how many pancakes can fit on the roof? Purple, because aliens don’t wear hats" -Ying

  6. #20
    Subaru Newb MainFrame's Avatar
    Join Date
    Sep 2002
    Location
    Texas, United States
    Posts
    8,162
    I Support ClubWRX I Support ClubWRX
    Quote Originally Posted by Heide264 View Post
    I disagree

    +1

    I'm not planning on tapering boost on my 93 octane map. My plan for 93 is pretty conservative timing and 21-23 psi to 7500rpm. .might not really taper my e85 map either since I'm having to limit boost to 27psi. I'll just have to see how the VE works out with the updated heads. If I can stay in a decent efficiency range to 8500rpm at that pressure ratio, why not? Right?

  7. #21
    zax
    zax is offline
    ¯\_(ツ)_/¯ zax's Avatar
    Join Date
    Nov 2008
    Location
    Neverland Ranch, Maryland
    Posts
    12,919
    I Support ClubWRX I Support ClubWRX
    Quote Originally Posted by Donkey View Post
    I ran my blueline to 3500ft


    Sent from my magic banana
    You road the blue line for 3500 feet? Pentagon City to Crystal City?

    Metro - Rail - Maps - Rail/Google Map
    2015 CWP WRX STi ... But how did I get roped back into an EJ motor?!
    Zax's utterly unimaginably stock 2015 STi build thread
    Zax's Shaggin' Wagon Build Thread Now tuned for 99% pure Unicorn Jizz!

    Zach | Moderator -- Mid-Atlantic States, Tech & Modifying & General Repairs
    Rollin' with the Bugeye Mafia #302 | N.E.R.D. Subject Zero
    Facebook me here

    Your Mid-A local board: http://www.clubwrx.net/forums/mid-atlantic-states/

  8. #22
    ¯\_(ツ)_/¯ Rambo's Avatar
    Join Date
    Oct 2010
    Location
    Denial
    Posts
    4,927
    I Support ClubWRX
    Quote Originally Posted by Heide264 View Post
    If I was making a time attack car... I'd size my turbo to hit peak boost within a few thousand rpm of redline... and hold it until redline. Pending reliability concerns and the such. It all depends on the situation.
    Well ok, fair enough, but it doesn't sound like the OP is building a time attack car, which was my point. Sure, if you've got a built engine, and are driving the car in a style that needs high rpms, go for it. Time attack and AutoX come to mind, but I still argue it wouldn't be useful for a daily driven car in normal traffic.
    Last edited by Rambo; 01-24-2013 at 12:42 PM.
    Isaac -- 2003 WRX sedan Stg II - Gave its life for mine 6/2013.
    2007 Outback 3.0R wagon
    Proud owner of a N.E.R.D, Member 1.38×10-23

    The pursuit of knowledge is hopeless and eternal... Hooray!!! - Professor Farnsworth

  9. #23
    Subaru Newb MainFrame's Avatar
    Join Date
    Sep 2002
    Location
    Texas, United States
    Posts
    8,162
    I Support ClubWRX I Support ClubWRX
    Quote Originally Posted by Donkey View Post
    I ran my blueline to 3500ft


    Sent from my magic banana

    And I ran my brown line to the bathroom. .

  10. #24
    Registered User Heide264's Avatar
    Join Date
    May 2010
    Location
    Pittsburgh, PA
    Posts
    4,169
    I Support ClubWRX
    Quote Originally Posted by MainFrame View Post
    +1

    I'm not planning on tapering boost on my 93 octane map. My plan for 93 is pretty conservative timing and 21-23 psi to 7500rpm. .might not really taper my e85 map either since I'm having to limit boost to 27psi. I'll just have to see how the VE works out with the updated heads. If I can stay in a decent efficiency range to 8500rpm at that pressure ratio, why not? Right?
    True, but I/we do see Rambo's point, which should be stressed for others for reference.

    With most smaller turbos, it is worth opening the wastegate to lower boost pressure towards higher CFMs (redline)... even if its possible to hold pressure. At that very high engine speeds (for a smaller turbo, again):
    -The turbo is out of its efficiency range. You may get more mass into the cylinder with denser, colder air at a lower drive pressure by opening the waste gate. The intercooler plays a large part in this, obviously.
    -The turbo just can't put out enough CFM to supply the engine while the valves are open for such a short period of time. A good analogy would be why adding a fuel pump can reduce injector duty cycles (IDCs) in the higher IDC range, or why people upgrade fuel rails to a certain extent... Fluid dynamics.
    Quote Originally Posted by Trainrex
    He was throwing balloons filled with sulfuric acid and shrapnel at the swat team. They finally had to take him down with rubber bullets.
    2011 STi Build Log
    -Part 1 - Reading, Data Logging, and Analyzing Data
    -Part 2 - Turbocharger 101 & Basic Boost Control
    -Part 3 - EcuFlash, Experimental Defintions, and a Drive By Wire Intro

  11. #25
    Subaru Newb MainFrame's Avatar
    Join Date
    Sep 2002
    Location
    Texas, United States
    Posts
    8,162
    I Support ClubWRX I Support ClubWRX
    Quote Originally Posted by Heide264 View Post
    True, but I/we do see Rambo's point, which should be stressed for others for reference.

    With most smaller turbos, it is worth opening the wastegate to lower boost pressure towards higher CFMs (redline)... even if its possible to hold pressure. At that very high engine speeds (for a smaller turbo, again):
    -The turbo is out of its efficiency range. You may get more mass into the cylinder with denser, colder air at a lower drive pressure by opening the waste gate. The intercooler plays a large part in this, obviously.
    -The turbo just can't put out enough CFM to supply the engine while the valves are open for such a short period of time. A good analogy would be why adding a fuel pump can reduce injector duty cycles (IDCs) in the higher IDC range, or why people upgrade fuel rails to a certain extent... Fluid dynamics.

    Right. .you will need to consult compressor maps, tuner experience, as well as how the car actually responds during the tune to determine what pressure ratio to run on order the achieve the best/safest results. On a td0d this certainly doesn't mean trying to push 18psi at 7000rpm, that turbo is just a little guy.

  12. #26
    Pro Manscaper Mikie13's Avatar
    Join Date
    Oct 2006
    Location
    Palmyra, NJ
    Posts
    20,805
    Quote Originally Posted by MainFrame View Post
    And I ran my brown line to the bathroom. .
    The brown line ran down your leg?
    The Hawk-Eye Alliance #90|The Blobeye Syndicate #0|The Stink-Eye Mob #0|N.E.R.D. Founding Member & #3
    2012 Lightning Red WRX Sedan Stock...for now Soon to be OpenSource tuned by: Mattypants @ WTF Tuning
    "If I have 10 ice cubes and you have 11 giraffes, how many pancakes can fit on the roof? Purple, because aliens don’t wear hats" -Ying

Page 2 of 2 FirstFirst 12

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •