Page 1 of 2 12 LastLast
Results 1 to 10 of 13

Thread: boosting issue

  1. #1
    Forum User Feedback Score 0
    Join Date
    Sep 2010
    Owner Since

    Posts
    40
    Thanks
    0
    Thanked 0 Times in 0 Posts

    boosting issue

    Im set up to run 14 pounds of boost on stock turbos. I just replaced the heads,turbos,y-pipe and gutted the cats. I just got the car back yesterday so i have not pushed her hard at all. As i was coming home from the shop and getting on the interstate i gave it some gas and as boost began to build the car just nose dived i guess you could call it. The engine stuttered and acted like it just gave up. My first thought was over boost. My gauge was reading 25 (aftermarket pro-sport) pounds(dont even think 9b's can spike 25 lbs lol). I pulled over immediately and turned the mbc almost all the way down. as i was getting back on the highway i babied her up to speed. in 6th i tried again and same result. this time i heard a loud whistle under the hood. Any ideas... my first thought was a massive boost leak.

    Oh i did replace some things this morning as well. i replaced the rear o-ring on the rear turbo pipe and the vac caps that were dry rotted. This killed the whistle but not stalling during boost

    And 1 thing i did notice is i can ease into boost a little bit but not full throttle.

    Things i have done to car when it went down.
    fairly new 9b's from a jdm engine
    vac reduction
    y-pipe
    gutted cats

  2. #2
    SKADOOSH!!! verified Feedback Score 1 (100%) J_Parker's Avatar
    Join Date
    Sep 2010
    Owner Since
    2008

    Location
    Prince George
    Posts
    1,302
    Blog Entries
    4
    Thanks
    47
    Thanked 49 Times in 42 Posts
    Check your wastegates pressure, do a pressure test on your intake, had you done anything to do with fuel? In the simple mind thoughts I had it sounds a lot like fuel cut?

    Also, what year is your car? check into your TPS, and CAS.
    Photobucket

  3. #3
    Forum User Feedback Score 0
    Join Date
    Sep 2010
    Owner Since

    Posts
    40
    Thanks
    0
    Thanked 0 Times in 0 Posts
    no pressure test yet...

    as far as fuel its all stock system. with the boost set at 7 pounds it dont fuel cut as often.

    My mechanic that worked on it to get it running said the same thing a fuel cut.

    tps and cas rings no bells can you explain a little?

  4. #4
    Forum User Feedback Score 0 ikOnone's Avatar
    Join Date
    Sep 2010
    Owner Since

    Posts
    17
    Thanks
    1
    Thanked 1 Time in 1 Post
    Quote Originally Posted by Ok3skid1 View Post
    tps and cas rings no bells can you explain a little?
    throttle position sensor and cam angle sensor.
    1991 3000GT VR-4 for fun
    1993 honda civic hatch for every day

  5. #5
    There will be Blood! verified Feedback Score 4 (100%) CoopKill's Avatar
    Join Date
    Sep 2010
    Owner Since
    1997

    Location
    In Sane!
    Posts
    4,757
    Thanks
    1,095
    Thanked 451 Times in 332 Posts
    Boost leak classic.

    Help them, for they know not that which they do not know!
    CoopKill's Mistress Makeover Thread!
    "Punk, Nutswinging, Small Time, Asshat, Monkey, Jerkoff, Loser that rides on other peoples accomplishments!" . .

  6. #6
    Forum User Feedback Score 0
    Join Date
    Sep 2010
    Owner Since

    Posts
    40
    Thanks
    0
    Thanked 0 Times in 0 Posts
    i turned the boost controller way down. My gauge showed a total of 7 pounds of boost the last time i boosted. Now i cant hold 2 pounds without a bunch of air escaping from some where. It sounds horrible. maybe my blow off valve

  7. #7
    Forum User verified Feedback Score 1 (100%)
    Join Date
    Sep 2010
    Owner Since

    Location
    Loveland, OH
    Posts
    144
    Blog Entries
    1
    Thanks
    5
    Thanked 13 Times in 7 Posts
    Spark Blowout..
    Replace coil packs and/or wires or perhaps the PTU..

  8. #8
    There will be Blood! verified Feedback Score 4 (100%) CoopKill's Avatar
    Join Date
    Sep 2010
    Owner Since
    1997

    Location
    In Sane!
    Posts
    4,757
    Thanks
    1,095
    Thanked 451 Times in 332 Posts
    Quote Originally Posted by MightyMouse View Post
    Spark Blowout..
    Replace coil packs and/or wires or perhaps the PTU..
    WTF, do you even read what is posted?

    i turned the boost controller way down. My gauge showed a total of 7 pounds of boost the last time i boosted. Now i cant hold 2 pounds without a bunch of air escaping from some where. It sounds horrible. maybe my blow off valve

  9. #9
    There will be Blood! verified Feedback Score 4 (100%) CoopKill's Avatar
    Join Date
    Sep 2010
    Owner Since
    1997

    Location
    In Sane!
    Posts
    4,757
    Thanks
    1,095
    Thanked 451 Times in 332 Posts
    You need to get a pressure tester and start finding your leaks. From what you are posting it sounds like it's a major leak at a connection point.

  10. #10
    Forum User Feedback Score 0
    Join Date
    Sep 2010
    Owner Since

    Posts
    40
    Thanks
    0
    Thanked 0 Times in 0 Posts
    Quote Originally Posted by CoopKill View Post
    You need to get a pressure tester and start finding your leaks. From what you are posting it sounds like it's a major leak at a connection point.
    of course i read it... Why would i ask for help and not read anything

    Im in the process of building a pressure tester...

    as far as the ptu and coils both were pulled and tested during the process of putting motor back together from head job. They both tested good but i dont know enough so im not saying there not my problem still.

Page 1 of 2 12 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
The 3000GT/Stealth/GTO Web History Project
3000gt.com
3000GT / Stealth International WWWboard Archive
Jim's (RED3KGT) Reststop
3000GT/Stealth/GTO Information and Resources
Team 3S
3000GT / Stealth / GTO Information
daveblack.net
3000GT/Stealth/GTO Clubs and Groups
Michigan 3S
MInnesota 3S
Wisconsin 3S
Iowa, Nebraska, Kansas 3S
North California 3000GT/Stealth
United Society of 3S Owners
3000GT/Stealth/GTO Forums
3000GT/Stealth International
3000GT/Stealth/GTO Event Pages
3S National Gathering
East Coast Gathering
Upper Mid-West Gathering
Blue Ridge Gathering