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    94 855 turbo problem

    I have a 94 855 turbo. when the rpm hit around 3000 to 4000, it seems don't want to go any higher and engine sounds like one of the cylinder not working and the rpm will raise very slow as well as the speed. I also notice the idle is not stable when at red light (not noticeable by looking at the rpm but I can feel the jerk). It is more noticeable when a/c is on. Everything had been check incl leak, plugs and so on but nothing found. Fuel filter has been changed and throttle body has been clean. My mechanic suggests it could be a plug cat. It all happen after I shorten the wastegate and even restore it to the orig setting doesn't change except the problem might delay to 4000 rpm. Other than that the car has lots of power and derives very smooth if I take it easy and keep running in low rpm. I have search all the forum I know and noone seems to have this problem. Also this is very hard for me to explain, hope you guys understand what I am trying to say. Thanks.

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    Hello

    And



    Nice to see you could make it.
    SAM ECU
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    Right this still sound like "Overboost".

    I would be inclined to advise you to go and take a few more turns of the Waste Gate Actuator, it sound like you could have disturbed something when you increased the pre-tension.

    But I do have a few question which will help me further.

    1) What did your stock boost gauge go up to before you adjusted the W/G ?

    2) Did the fault appear straight after you made the adjustment ?

    3) How many turns of adjustment did you make ?

    4) What does your boost gauge show currently ?

    That will do for now, if you could answer those please then we can go from there
    SAM ECU
    Custom Super 60 18T Turbo With Uprated 300/70 W/G
    Blitz Dual SBC Boost Controller
    Blue Injectors
    NGK Iridium Spark Plugs
    Custom 1 Box 3" Turbo-Back Exhaust
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    See All The Pics Of SAM Here

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    94 855 turbo problem

    Thanks Steve. Pls see answer below

    I would be inclined to advise you to go and take a few more turns of the Waste Gate Actuator, it sound like you could have disturbed something when you increased the pre-tension.
    edwingsiu reply: I have lose the tension to max and the only different is the problem comes back at higher rpm instead of 3000.


    But I do have a few question which will help me further.

    1) What did your stock boost gauge go up to before you adjusted the W/G ?
    edwingsiu reply: not sure since i had a hose leak and i think it was about 1/4 or less over the white.

    2) Did the fault appear straight after you made the adjustment ?
    Edwingsiu reply: no it did not. that's why i have a feeling it was not cause by the adjustment except if i ever bended the rod.

    3) How many turns of adjustment did you make ?
    edwingsiu reply: since i have forgot the orig setting. I have decide to turn it to the point where i can drop it to the pin and assume it was base. I used the football pump and pump it to about 6 psi (which was suggested by someone i forgot who and where that I can set it between 6 to 8 psi) and it works out to about 12 turns from where I so call base setting. and the result was great.

    4) What does your boost gauge show currently ?
    edwingsiu reply: If I floor it, it will go as high as 3/4 of the white. otherwise, it will run at around 1/4 of the white at about 2500 to 3000 rpm. If I adj the rod to base, it will run at around 1/4 of the white at 3000 rpm.

    Everything is pretty well stock on my car. The only thing i did was the wastegate and holes in the air box. Since I don't want to spend too much money on performance stuffs and where I live don't have too many motorway, I smooth and low end power can make me happy. that's why i just want to do a little trick in the econ way.

    Hope this is enough infor for you. thanks.

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    Hmmmm

    Right sound like you could have a bad vac leak.

    From stock the boost gauge should reach 3/4 into the white area. Which is around the 9 psi stock boost level, the end of the white area is around 14.5 (1.0 Bar) and this is also the level at which the stock ECU will cut the ignition in the event of "Overboost".

    So to start with your car wasn't right or your gauge had a major leak ?

    Now you estimated 12 turns on the WG this is way out. Most end up with 2 or 4 and some 6 but 12 we have another problem.

    Now trying to sort this in my head I keep thinking, your WG is now too loose and cant build boost and the turbo could be going into overspin, and secondly you have a bad vac leak.

    Have another quick look at your pipes and see if you can find anything obvious. Also check the connections to the BCS and if you get the chance pop down to a garage that can hook up a calibrated boost gauge, if you dont want to invest in one, but if your playing with boost for 25 they are well worth it and could save your rods, which by the way I dont believe you've bent as you would have mentioned a major ticking sound over and above that of the injectors and the idle control valve.

    I'm sure this is just somthing silly and am confident now its a vac leak.

    Steve
    SAM ECU
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    did i see a link somewhere to a post on how and what to check for air leaks?

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    SAM ECU
    Custom Super 60 18T Turbo With Uprated 300/70 W/G
    Blitz Dual SBC Boost Controller
    Blue Injectors
    NGK Iridium Spark Plugs
    Custom 1 Box 3" Turbo-Back Exhaust
    TurboXS Type R-HFL
    K&N Style Cone Filter With Cold Feed
    87 Deg Stat
    Full Poly Bushed
    Custom 60mm Drop Suspension
    Strut Brace
    18" Shadow Chrome Pegs
    305mm Drilled Brembo's With Ferodo DS Pads
    6000k HID Kit
    Flat Areo Style Wipers


    See All The Pics Of SAM Here

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    cheers thats the one...

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    excuse my complete lack of mechanical knowledge here but on the big pipe coming from the turbo (my 97 t5)there are two rubber nipples that come off.
    On mine one is split. What are they?

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    Quote Originally Posted by fireplums
    cheers thats the one...
    No need for the thanks, its all in a days work for the "Volvo T5 Forum Performance Guru Administrator"

    And have a nice day
    SAM ECU
    Custom Super 60 18T Turbo With Uprated 300/70 W/G
    Blitz Dual SBC Boost Controller
    Blue Injectors
    NGK Iridium Spark Plugs
    Custom 1 Box 3" Turbo-Back Exhaust
    TurboXS Type R-HFL
    K&N Style Cone Filter With Cold Feed
    87 Deg Stat
    Full Poly Bushed
    Custom 60mm Drop Suspension
    Strut Brace
    18" Shadow Chrome Pegs
    305mm Drilled Brembo's With Ferodo DS Pads
    6000k HID Kit
    Flat Areo Style Wipers


    See All The Pics Of SAM Here

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    Quote Originally Posted by fireplums
    excuse my complete lack of mechanical knowledge here but on the big pipe coming from the turbo (my 97 t5)there are two rubber nipples that come off.
    On mine one is split. What are they?

    As in whats shown in this pic ?



    If so they both go to the Crank Case Oil Separator Canistor which is housed under the intake manifoid.

    You really need to fix the split or replace the part.
    SAM ECU
    Custom Super 60 18T Turbo With Uprated 300/70 W/G
    Blitz Dual SBC Boost Controller
    Blue Injectors
    NGK Iridium Spark Plugs
    Custom 1 Box 3" Turbo-Back Exhaust
    TurboXS Type R-HFL
    K&N Style Cone Filter With Cold Feed
    87 Deg Stat
    Full Poly Bushed
    Custom 60mm Drop Suspension
    Strut Brace
    18" Shadow Chrome Pegs
    305mm Drilled Brembo's With Ferodo DS Pads
    6000k HID Kit
    Flat Areo Style Wipers


    See All The Pics Of SAM Here

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    no they are just like little caps - half the size of a pen lid . Theres one at the top and one at the bottom. They slide off to reveal a hole.
    Sorry not very helpful I know

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    Quote Originally Posted by fireplums
    no they are just like little caps - half the size of a pen lid . Theres one at the top and one at the bottom. They slide off to reveal a hole.
    Sorry not very helpful I know
    So they are holes capped off by a little nipple and one has split ?
    SAM ECU
    Custom Super 60 18T Turbo With Uprated 300/70 W/G
    Blitz Dual SBC Boost Controller
    Blue Injectors
    NGK Iridium Spark Plugs
    Custom 1 Box 3" Turbo-Back Exhaust
    TurboXS Type R-HFL
    K&N Style Cone Filter With Cold Feed
    87 Deg Stat
    Full Poly Bushed
    Custom 60mm Drop Suspension
    Strut Brace
    18" Shadow Chrome Pegs
    305mm Drilled Brembo's With Ferodo DS Pads
    6000k HID Kit
    Flat Areo Style Wipers


    See All The Pics Of SAM Here

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    yep one is split its just hanging on there

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    Quote Originally Posted by fireplums
    yep one is split its just hanging on there
    They must be aux holes for when that tubes used on a different model, I will try to find out exact. Just ensure the hole is still blocked and you'll be fine.

    I will keep you posted thou
    SAM ECU
    Custom Super 60 18T Turbo With Uprated 300/70 W/G
    Blitz Dual SBC Boost Controller
    Blue Injectors
    NGK Iridium Spark Plugs
    Custom 1 Box 3" Turbo-Back Exhaust
    TurboXS Type R-HFL
    K&N Style Cone Filter With Cold Feed
    87 Deg Stat
    Full Poly Bushed
    Custom 60mm Drop Suspension
    Strut Brace
    18" Shadow Chrome Pegs
    305mm Drilled Brembo's With Ferodo DS Pads
    6000k HID Kit
    Flat Areo Style Wipers


    See All The Pics Of SAM Here

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    was just having a poke around at lunch time , think I might go pick up the haynes manual or something and try and get my head around the layout a bit all looks a bit confusing at the moment

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    Quote Originally Posted by fireplums
    was just having a poke around at lunch time , think I might go pick up the haynes manual or something and try and get my head around the layout a bit all looks a bit confusing at the moment
    LOL

    Is simple one you know what your looking at

    Get a Haynes its quite good one for the T5's
    SAM ECU
    Custom Super 60 18T Turbo With Uprated 300/70 W/G
    Blitz Dual SBC Boost Controller
    Blue Injectors
    NGK Iridium Spark Plugs
    Custom 1 Box 3" Turbo-Back Exhaust
    TurboXS Type R-HFL
    K&N Style Cone Filter With Cold Feed
    87 Deg Stat
    Full Poly Bushed
    Custom 60mm Drop Suspension
    Strut Brace
    18" Shadow Chrome Pegs
    305mm Drilled Brembo's With Ferodo DS Pads
    6000k HID Kit
    Flat Areo Style Wipers


    See All The Pics Of SAM Here

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    bit embarrassed to admit this ..........
    but just looked again at the "Turbo" ...
    um ...... found the air filter inside it
    really do need that haynes manual !

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    Quote Originally Posted by fireplums
    bit embarrassed to admit this ..........
    but just looked again at the "Turbo" ...
    um ...... found the air filter inside it
    really do need that haynes manual !
    LMAO

    The box that has "Turbo" writen on it, you thought that was the turbo

    ROTH CMEY

    Nice try but sorry, no it the air filter
    SAM ECU
    Custom Super 60 18T Turbo With Uprated 300/70 W/G
    Blitz Dual SBC Boost Controller
    Blue Injectors
    NGK Iridium Spark Plugs
    Custom 1 Box 3" Turbo-Back Exhaust
    TurboXS Type R-HFL
    K&N Style Cone Filter With Cold Feed
    87 Deg Stat
    Full Poly Bushed
    Custom 60mm Drop Suspension
    Strut Brace
    18" Shadow Chrome Pegs
    305mm Drilled Brembo's With Ferodo DS Pads
    6000k HID Kit
    Flat Areo Style Wipers


    See All The Pics Of SAM Here


 

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