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Stock boost pressure question

Discussion in 'Superchargers and Turbos' started by darrenmhaine, 18 November 2018.

  1. darrenmhaine

    darrenmhaine Full member

    Messages:
    10
    From:
    Weymouth
    Car:
    Golf 1.4 tsi
    Hey all
    does anyone know, or can point me to a source where I can find out what boost pressures my Golf V 1.4 tsi 140hp should be running stock?

    cheers, Darren.
     
  2. TCJBOLDIE

    TCJBOLDIE Torque King

    Messages:
    4,423
    From:
    Brisbane
    Car:
    JB Starion
    Have you googled looking for an answer ?

    IMO you should have a boost gauge fitted because you won't be able to detect any increases IF the diaphragm OR the line connecting the wastegate develops a leak as that will allow more pressure leading to lean AFR's and detonation that can and will lead to a damaged motor if not rectified.
     
    Last edited: 19 November 2018
  3. darrenmhaine

    darrenmhaine Full member

    Messages:
    10
    From:
    Weymouth
    Car:
    Golf 1.4 tsi
    On it already, got one yesterday, so will be fitting it this week
     
  4. obi_waynne

    obi_waynne Administrator Staff Member Moderator

    Messages:
    40,884
    From:
    Deal, Kent UK
    Car:
    A3 1.4 TFSI 150 COD
    At full boost it should be pushing 0.8bar@1500 rpm
    Constant pressure is around 0.6bar
    Pressure at rev limit is slightly lower at 0.4bar

    *(Not sure on the model years, there were some engine tweaks later on which may well deviate from these figures.)

    Remapped cars and tuned cars generally run around 1.4 bar of boost, but obviously this varies on the mods and your requirements from the car.
     
  5. darrenmhaine

    darrenmhaine Full member

    Messages:
    10
    From:
    Weymouth
    Car:
    Golf 1.4 tsi
    Thank you for that, thats helpful |B
    Now the question is; how much psi can I run with stock injectors?
     
  6. TCJBOLDIE

    TCJBOLDIE Torque King

    Messages:
    4,423
    From:
    Brisbane
    Car:
    JB Starion
    IMO the best and safest way is to get it on a dyno and get the duty cycle of the injectors at WOT as well as the AFR's

    It is generally accepted that the DC of the injectors @ WOT should be no higher than 85%

    IF you are intending to run a higher boost pressure then it should be remapped on the dyno by someone who knows exactly what he/she is doing as higher boost pressure needs the EMS to add more fuel to keep the AFR's from leaning out.

    IF you don't do what I have recommended it can and almost certainly will end in tears if the boost is upped by more than say 2-3 psi and driven hard.:eek:
     
    Last edited: 23 November 2018
  7. Lunchmoney

    Lunchmoney Torque Master

    Messages:
    984
    From:
    Poole, UK
    Car:
    '98 JDM Impreza STI
    I'm assuming not World Of Tanks?
     
  8. TCJBOLDIE

    TCJBOLDIE Torque King

    Messages:
    4,423
    From:
    Brisbane
    Car:
    JB Starion
    Lunchy it means Wide Open Throttle = pedal to the metal :)

    I will add the following for newbies|B

    DC = duty cycle
    EMS = engine management system
    AFR = Air Fuel Ratio
     
    Lunchmoney likes this.
  9. darrenmhaine

    darrenmhaine Full member

    Messages:
    10
    From:
    Weymouth
    Car:
    Golf 1.4 tsi
  10. darrenmhaine

    darrenmhaine Full member

    Messages:
    10
    From:
    Weymouth
    Car:
    Golf 1.4 tsi
    Absolutely, the AFR gauge is going in next week and I wouldn't even consider touching it before then. As it stands at the mo, it spikes to about 15psi, then hold about 12psi with gate flutter.
     
  11. TCJBOLDIE

    TCJBOLDIE Torque King

    Messages:
    4,423
    From:
    Brisbane
    Car:
    JB Starion
    Mate it looks like we are on the same page so a lot of info that I post is info for people starting out on the mod path.

    Lunchy and I go way back and was unsure if he wasn't just yanking my chain ;)
     
    Last edited: 24 November 2018
    darrenmhaine likes this.
  12. Lunchmoney

    Lunchmoney Torque Master

    Messages:
    984
    From:
    Poole, UK
    Car:
    '98 JDM Impreza STI
    I was having a moment and really couldnt get what WOT might mean....

    I'll go back to my cupboard now...
     
  13. TCJBOLDIE

    TCJBOLDIE Torque King

    Messages:
    4,423
    From:
    Brisbane
    Car:
    JB Starion
    [QUOTE="Lunchmoney, post: ...

    I'll go back to my cupboard now...[/QUOTE]

    I'm glad that it was a cupboard you came out of and not the closet ;) :lol:
     
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