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Thread: boost pressure

  
  1. #1
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    boost pressure

    firstly let me just say i have no idea of what i am about to say.... so correct me if im wrong please.

    is the boost pressure of the Z20let variable?

    i,e warm weather when the intercooler is taking in warmish air running around 1.1bar and Cold winters day's when its really cold and damp out taking in a lot more cold air boost pressure could be up to 1.9bar?

    if this is the case, when is the engine running 200bhp? is it likely to gain power in winter?

    can you see where im coming from or do i need to explain better?

    does the actuator control this?

    sorry for all the question's, im trying to educate myself in the realm of turbo powahhh.

    Regards

    Ryan

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    In a word Ryan ..................... No

    The only way to increase boost is though the actuator, and then the ECU must also be updated, otherwise you would lose your throttle i.e. it cuts out the fly by wire

    But I could be wrong :roll:
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    ah right, the only reason i ask is that i went in a EVO 6 over the weekend, it was running 580bhp at the wheel's, he took me out for a spin in it and it was rapid. when we got back he said....

    'i was only running 1.6bar of boost, in cold weather i can run between 1.9 and 2.2 bar all the time, and then it gets mental'

    not like it wasnt mental enough, he literally had it sideways around every corner/ roundabout, i got fed up of looking at tree's, the apexi boost controller and little screen thingy said it too 2.67 seconds to 60! i was well impressed. £5k for front brakes tho. WOW

    thanks for putting me in right direction pete, appreciate it.

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    EVO is very different to the Z20let in the Vx's

    The ECU's can adapt to the temps especially if there is a mist in the air aswell, this helps cool the IC even more.

    As Pete says the Z20's are pretty difficult to tune, and althought reasonably intelligent, the ECU has no real idea to alter to the temps and conditions of the atmosphere.

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    Quote Originally Posted by LED_man
    ah right, the only reason i ask is that i went in a EVO 6 over the weekend, it was running 580bhp at the wheel's,
    not being funny and i know its slightly off topic - but are you sure!! :? :?

    Thats must be almost as much as a Maclaren F1 or SLR or Carrera GT has at the wheels.

    Would have to be putting out in excess of 650BHP at the flywheel to get 580BHP at the wheels due to 4WD transmission loses. :?
    Me run tings.... not tings run me!

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    The Z20LET has an air temperature sensor in the manfold after the intercooler, so it can detect what the the intake temperature is and modify the fueling etc to suit. There may be a time when the engine won't run overboost as effectively, due to heat, but most times an ECU will compensate for higher temperatures by overfuelling the mixture a little, as a rich mixture will cool the piston temperatures etc.

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    not being funny and i know its slightly off topic - but are you sure!!

    Thats must be almost as much as a Maclaren F1 or SLR or Carrera GT has at the wheels.

    Would have to be putting out in excess of 650BHP at the flywheel to get 580BHP at the wheels due to 4WD transmission loses.
    yes im sure.

    the car is a white EVO6, with over £60k spent on the engine alone, it was at Doncaster on Saturday night, i believe Bret888 was there, Will was also there and j3n VX,

    http://www.norris-designs.co.uk/photos.htm

    its the White Evo 6, with the Jun racing stickers on the side, 587 bhp.

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    says Evo 5 on that site can only see the Norris Designs stickers.

    EX-NORRIS DESIGNS EVO 5 ( 587bhp ) DEMO CAR

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    oo the evo 7 up top ops:

    soz went by the evo 5 as it has the same bhp....evo 7 was quite hard to try n find the sticker lol

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