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How much boost

Discussion in 'Forced Induction' started by Rich777, Feb 2, 2010.

  1. Rich777

    Rich777 New Member

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    Hey guys ive just rebuilt my b16b with b18c5 pistons to lower the c/r (its around 9.2:1 - 9.5:1) ive also used arp rod bolts and head studs. Ive got a turbo kit which ive made my self for it with a Garrett a.r.60 m11 turbo. Ime wondering what hp or psi i could reliably run ?
     
  2. Matts96HB

    Matts96HB . Moderator VIP

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    too many variables here to say "x psi will be reliable"
    tuning is going to make the biggest difference there
    cylinder pressures should be a slight concern with that compression level
    if i were you i wouldn't push the car past 250whp at the VERY MOST, even that power level can be shaky with shady tuning
     
  3. b16GSR

    b16GSR B Series Guru

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    With a bassiclly stock bottom end 7psi would be about the maximum to stay on the side of caution. 9psi would be about the most i would run with that setup.
     
  4. Briansol

    Briansol Admins Admin VIP

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    what are you using for management?
     
  5. Rich777

    Rich777 New Member

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    I'm going to be using ectune as management on a p28. I'm thinking i mite just take it to 7psi or 250 hp max and running it a a touch rich to be on the safe side.
     
  6. Matts96HB

    Matts96HB . Moderator VIP

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    id say tune it till you hit 230-250whp and call it a day.
     
  7. Rich777

    Rich777 New Member

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    So whats that in bhp ?
     
  8. Matts96HB

    Matts96HB . Moderator VIP

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    same thing i think
    measuring it at the brake is the same thing as the wheel
     
  9. Rich777

    Rich777 New Member

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    Nah its diffrent, bhp is normally more
     
  10. Matts96HB

    Matts96HB . Moderator VIP

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    bhp is measured on an engine dyno basically
    with your transmission on, thats what is now called SAE NET HP
    used to be SAE Gross HP, which would be with all of your accessories driven by an outside source
    now it is SAE NET HP
    so yes, bhp is going to be a little more than whp. since it is reading at the flywheel/transmission input shaft rather than at the wheel

    most tuners are going to want to tune your car on a rolling dyno, not an engine dyno
     
    Last edited: Feb 18, 2010
  11. pooksy64

    pooksy64 RidetilldeathdousparT

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    Boost is just a number you will have to run to make 250hp. Do you have a turbo compressor map for that turbocharger? If so plot your p/r and airflow rate:cfm (Y and X axis graph) to find exactly where the turbocharger will be spooling up/surge limit/turbo airflow limit etc. compressor map will tell you @ what percentage of efficiency the turbocharger will be running at.

    FYI try looking here for info
    Turbonetics, Inc. | Industrial and Performance Turbochargers, Intercoolers, Boosting Systems, Controls and more | Keeping You Cool Under Pressure

    Welcome to TurboByGarrett.com
     
    Last edited: Feb 19, 2010
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