boost controllers...what they do

Discussion in 'General Technical Discussion' started by Fred, Nov 17, 2007.

  1. Fred

    Fred Leaving Skid Marks

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    hi all, just a quick question....boost controllers, you plug them in, dail in the boost you want, i.e 12psi, and wala, 12psi instead of factory boost...??? is that what they do???

    also , what boost do legnums put out from factory...???

    Cheers. Fred.
     
  2. SLY-031

    SLY-031 Leaving Skid Marks

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    Hi mate. They use a single or dual solenoid system to regulate the air pressure signal being read by the wastegate diaphragm. Essentially, all they do is "trick" the wastegate in to thinking that it is at its set pressure, ie 8psi, whereas what has happened, is that the boost controller has blocked the flow to the wastegate until the controller gets a manifold pressure of XX psi, then feeds air to the wastegate. Thus opening the gate and holding that pressure.

    They also regulate the air being received by the wastegate to maintain a very smooth boost line.

    Many also have a gain control, which will bleed air to the wastegate to creep it open slowly or have it fully shut a slam open at the set pressure.

    Legnums from the factory run at 8 psi, though I believe there is already a factory style boost solenoid to allow boost to ramp up to 10-11psi.

    Someone may correct me on some things, but that is what I know.
     
  3. Fred

    Fred Leaving Skid Marks

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    cool , so they basically" trick" the wastegate, to open at a different psi than set....
     
  4. Kristian

    Kristian Leaving Skid Marks

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    They control boost :p
     
  5. snickells

    snickells Leaving Skid Marks Lifetime Member

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    (slaps head)

    Your losing it man hahahaha!
     
  6. SLY-031

    SLY-031 Leaving Skid Marks

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    Basically.

    Wastegate will open at its set pressure, say 8psi.

    Actual manifold pressure may be 15psi.
     
  7. AnthonyO

    AnthonyO Guest

    I assume they risk engine damage the higher you boost an otherwise unmodified engine.
     
  8. SiliconAngel

    SiliconAngel 1 AYC Bar

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    Depends on the Engine, but basically yes - you're running more power through the same components, so more wear and more stress, and if they're not up to the task then... However people have been running standard engine VR4s on up to 15psi for years, reportedly with no problems. Make of that what you will :)
     
  9. takumi

    takumi Guest

    Tell us more ?
     
  10. snickells

    snickells Leaving Skid Marks Lifetime Member

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    I installed a boost gauge today and I'm pulling about 10PSI when I slam it hard and about 5PSI when I'm slightly flooring it so I'm confused as hell now.
     
  11. The prefacelifts usually boost around 6psi and the facelifts around 8 if you have an auto. My one in standard form was boosting to 6 before I installed the boost controller.
     
  12. esemte

    esemte Guest

    Thats good news, does that mean the prefacelift autos (rated at 260hp) were only down on boost? Sounds like a simple "fix" :D
     
  13. MPBVr4

    MPBVr4 Idling at the Lights

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    As far as know a facelift ECU in your car will give you 280 bhp. Wack in a
    boost controller as well plus a decent exhaust and your up to 300 +:D
     
  14. takumi

    takumi Guest

    Anyone for a groupbuy for a Boost Gauge ?
     
  15. leebutts

    leebutts 1 AYC Bar

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    Geez - I just bought one...

    Getting one off FleaBay from the states with peak hold and warning lights. Came to about 100US delivered.

    Lee
     
  16. RaZZa137

    RaZZa137 Leaving Skid Marks

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    the harder the engine works, the more exhaust gases it produces, the more ehxaust=more pressure aka boost!
     
  17. SLY-031

    SLY-031 Leaving Skid Marks

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    LOL group buy on boost guages. Just buy one, cheap as.
     
  18. AnthonyO

    AnthonyO Guest

  19. takumi

    takumi Guest

    I don't want a cheap assed one that works some of the time ...
    Not to mention I'm on a cheap budget for my car, I have to factor in all the new games for the PS3 and the Wii ...
    I hate paying top dollar for everything.
     
  20. SiliconAngel

    SiliconAngel 1 AYC Bar

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    Completely agree Paul, which is why I hardly ever do. Having said that, though, sometimes its worth paying top dollar if the value is there. But I agree that I resent paying hundreds of dollars more for things just because there are one or two extra people in the chain of distribution. Those people aren't adding value, they're f@#$ing me over a barrel... or trying to, at least.
     

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