Results 1 to 5 of 5

Thread: Boost readings

  1. #1
    Join Date
    Jul 2012
    Location
    the twilight zone
    Posts
    121
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default Boost readings

    Quick question for you all ...................

    Driving the Q4 today and when you floor it the boost gauge whips round to 1.2bar then drops down to .8 and stays there with the throttle still down

    Is that normal behaviour or have i got an air leak or other issue ???

    The boost gauge is connected to a t junction onto the inlet manifold dunno if thats right or not and looking at the manuals the vac pipes to the egr dont appear to be right

    Might have to re pipe them but it goes like a barsteward just wondering about the drop from 1.2 to 0.8 more than anything

    Alfa 155 Twin Turbo RWD beast in the making


    Alfa 155 V6

    Q4

    Alfa 155 V6

    Alfa 155 V6

    Alfa 155 V6

    Alfa 155 2.0 rolling shell

    Alfa 147 1.6

    Alfa 159 sportwagon

  2. #2
    mpampis_'s Avatar
    mpampis_ is offline Running smoothly
    OP of the best thread of the year 2012
    Best Modified car of the year 2012
    Join Date
    Jan 2010
    Location
    greece
    Posts
    487
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    1.2 overboost is normal if yoy have any chip programme, near the limit 0.8 is normal too. How old is your wastegate?

  3. #3
    Join Date
    Jul 2012
    Location
    the twilight zone
    Posts
    121
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Ah now that i dont know ................... imported the Q4 from Japan so it could be original as i have no details etc

    But if 1.2 bar initially then falls to 0.8 is the norm then i`ll be happy

    Alfa 155 Twin Turbo RWD beast in the making


    Alfa 155 V6

    Q4

    Alfa 155 V6

    Alfa 155 V6

    Alfa 155 V6

    Alfa 155 2.0 rolling shell

    Alfa 147 1.6

    Alfa 159 sportwagon

  4. #4
    Join Date
    Jan 2007
    Location
    Derbyshire, UK
    Posts
    3,082
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Rides
    0

    Default

    So...what's the verdict now you've driven it in anger?

    wrinx
    My Q4 in the Garage

    www.alfaromeo155.co.uk ............................ □□□-V-□□□ .................................. www.ilmostro.co.uk

  5. #5
    Join Date
    Jul 2012
    Location
    the twilight zone
    Posts
    121
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Its all right ..................... just the pedals are the wrong way round and i`m sat on the wrong side

    Needs a bit more fiddling with but i`m happy

    Alfa 155 Twin Turbo RWD beast in the making


    Alfa 155 V6

    Q4

    Alfa 155 V6

    Alfa 155 V6

    Alfa 155 V6

    Alfa 155 2.0 rolling shell

    Alfa 147 1.6

    Alfa 159 sportwagon

Similar Threads

  1. More boost Issues..
    By jimnielsen in forum Alfa Romeo Q4 Tech.
    Replies: 21
    Last Post: 25-10-09, 12:45
  2. Boost control
    By Evodelta in forum Alfa Romeo Q4 Tech.
    Replies: 30
    Last Post: 29-09-08, 07:30
  3. Boost Readings
    By jimnielsen in forum Alfa Romeo Q4 Tech.
    Replies: 8
    Last Post: 12-06-08, 02:39
  4. Boost Curve.
    By jimnielsen in forum Alfa Romeo Q4 Tech.
    Replies: 7
    Last Post: 19-02-08, 07:12
  5. AFR vs Boost pressure
    By arjunior45 in forum Alfa Romeo Q4 Tech.
    Replies: 0
    Last Post: 01-05-07, 17:30

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
  •