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Thread: fluctuating boost

  
  1. #1
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    coupeturborsa's Avatar
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    fluctuating boost

    hey guys, so my car was on the dyno this weekend. does not seem to be going very well. car is boosting nicely, overboost to 1.6 bar, settles to 1.1 bar, at abt 3500rpm, she drops boost to 0.9bar then picks up again to 1.1 bar. what could be the problem here ? also what gear do you guys do dyno runs ? 3rd or 4th gear ?
    2002 ASTRA COUPE TURBO - PH3.5
    352 bhp and 370ft lb


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    hott4u's Avatar
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    4th gear has the best 1:1 ratio
    Regal 3.5+ 325map
    2003 Astra Turbo

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    paul_gsi's Avatar
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    hello matey, yeah 4th gear is what we put the car on the roller's, about your problem you tried the pedle test? to see if any code's come up?

    might be worth seeing if any code's are there first, if none, then i would change the front/rear BCS,as they could make that happen, still happening (might) be your AFM, which also could make thta happen,

    but would try and see if there is any code's there, pedle test, or a good code reader,

    paul

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    Burtdick's Avatar
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    What is the pedal test. nobody ever answers lol
    Regal Phase 1 + Intercooler
    270BHP 300ftlb And Nothing Else, All standard

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    here you are matey,
    do the pedle test matey, or code reader/ pedle test long story short/

    put your feet,, on the brake & exhell and hold down , put the key in turn twice(dont start) a little spanner will apper in the dash , count the flash's between the pause's,

    e,g 10 flash's-pause/ 8-flash's-pause/ 7- flash's-pause/ 6-flash's-pause=

    0876


    you can you the search fourm at the top right of this fourm, took me, to some 1 told me about it, every thing you need to know in there, like code's and so on , or google your code's, if still carnt find your code's, then post them up here and ask nice , some 1 will help

    paul

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    hey guys, didnt do the peddle test yet. not at home this week and dont have car with with. will check for codes and post this weekend.
    2002 ASTRA COUPE TURBO - PH3.5
    352 bhp and 370ft lb


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    Burtdick's Avatar
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    I did the pedal test last night and it flashed constantly no pauses. So i am assuming this means no problems.
    Regal Phase 1 + Intercooler
    270BHP 300ftlb And Nothing Else, All standard

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    chr15g's Avatar
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    Yep,
    No codes matey

    Lucky sod...
    Chris

    2.0 Coupe Turbo
    (Now Dead........)

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