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    Turbos: I'm getting 16psi - Enough?

    In cool weather, Sport Chrono button on, starting by flooring it in 3rd it never goes over 16psi

    (i.e. floor it in 3rd gear @ 2500 to redline then shift, then to redline in 4th, etc.))

    That's supposedly overboost. IS that enough?

    Something wrong?

    Conversions 16psi=

    1.1 bar

    1.125 kg/cm2

     

    THANKS!

     


    --
    2007 997 Turbo


    Re: Turbos: I'm getting 16psi - Enough?

    MMD:

    In cool weather, Sport Chrono button on, starting by flooring it in 3rd it never goes over 16psi

    (i.e. floor it in 3rd gear @ 2500 to redline then shift, then to redline in 4th, etc.))

    That's supposedly overboost. IS that enough?

    Something wrong?

    Conversions 16psi=

    1.1 bar

    1.125 kg/cm2

     

    THANKS!

     

     

    Is your question

    a. And what should the max reading be in any gear?

    b. What is the max boost reading doing exactly what you did?

    Can't answer b. yet. But the answer to a. is the max reading should be 17 psi, 1.2 bar. The easiest way to see this is to do what you did, but in 4th gear, or better yet, 5th and 6th gear. The higher gear presents a higher load to the engine, I think.

     


    --

    Regards,
    Can
    997 Turbo + Bilstein Damptronic ( Review ) + GIAC ECU Tune ( Fast as a torpedo & reversible to stock - Review ) + Cargraphic Exhaust ( Oh heavenly noise! )


    Re: Turbos: I'm getting 16psi - Enough?

    "a." is my issue (nice work clarifying)   Smiley

    Since I really have an aversion to totally beating the s*** outta my car I guess, in my car's case things are ok. I suppose I could "get it up" to 17 if I tried harder and conditions were different. Smiley

    Thanks Buddy!  Smiley


    --
    2007 997 Turbo


    Re: Turbos: I'm getting 16psi - Enough?

    MMD:

    "a." is my issue (nice work clarifying)   Smiley

    Since I really have an aversion to totally beating the s*** outta my car I guess, in my car's case things are ok. I suppose I could "get it up" to 17 if I tried harder and conditions were different. Smiley

    Thanks Buddy!  Smiley

     


     

    You're welcome. You don't have to try "harder," just floor the pedal in 5th or 6th gear (instead of 3rd, to give the engine a higher load to work against), and you should see 17 psi/1.2 bar.
    If not, then your car for whatever reason is not seeing max possible boost. Whether you could feel a difference, say against my car, I don't know.

    I tried 3rd gear this morning and did find it harder to see max boost in 3rd gear, and almost ran over a Prius in the process. Smiley

     


    --
     

    Regards,
    Can
    997 Turbo + Bilstein Damptronic ( Review ) + GIAC ECU Tune ( Fast as a torpedo & reversible to stock - Review ) + Cargraphic Exhaust ( Oh heavenly noise! )


    Re: Turbos: I'm getting 16psi - Enough?

    Yes, now using a higher gear makes more sense though I must admit I still need  to take a class in owning this car. I printed out your advice, putting it on my car's dash. Will try it out during next drive. Will report back.  Thank you again C., you're the man!   


    --
    2007 997 Turbo

    Re: Turbos: I'm getting 16psi - Enough?

    Contrary to what many people (who in particular seem to frequent the 6Bling channel) think, our engines will have less boost when it is cooler not more.

    One of the ECUs major inputs is air mass and it works tirelessly to hit certain air mass targets which are programmed into the mapping. At DIN climatic conditions (temp 20DegC) you should see what Porsche says you should under high load (3rd gear should be load enough).

    If the air is cooler and the mass of air is denser then the programm will adjust the boost to be lower to hit the same target so your 1.1bar is probably perfectly fine.

    If you connect a Durametric reader to your ECU you can read off the density of the air in kg/m3 which you can observe varying day to day.....


    --

    2009 997 GT2 659PS/827NM DIN


    Re: Turbos: I'm getting 16psi - Enough?

    MMD:

    Yes, now using a higher gear makes more sense though I must admit I still need  to take a class in owning this car. I printed out your advice, putting it on my car's dash. Will try it out during next drive. Will report back.  Thank you again C., you're the man!   

    LOL. I know. The other day someone asked what the Sport Chrono button does and when I started listing, we realized to my surprise it actually does 6 different functions. (You know what they are, don't you? Here is a hint, 6 acronyms: PSM, PASM, PTM, TCU, ECU, ETC. And ETC is not etcetera, it's another acronym! Smiley)

    BTW, for the boost pressure, I did what you did and saw 16 psi in third gear too. 5th & 6th will or should show 17 psi consistently. Just make sure there is no Prius in front when you go WOT in 5th. Smiley 

     


    --
     

    Regards,
    Can
    997 Turbo + Bilstein Damptronic ( Review ) + GIAC ECU Tune ( Fast as a torpedo & reversible to stock - Review ) + Cargraphic Exhaust ( Oh heavenly noise! )


    Re: Turbos: I'm getting 16psi - Enough?

    TB993tt:

    If you connect a Durametric reader to your ECU you can read off the density of the air in kg/m3 which you can observe varying day to day.....

     

    If you're going to go the way of a Durametric interface, I'd datalog the boost pressure.  The dash gauge is incredibly inaccurate.


    Re: Turbos: I'm getting 16psi - Enough?

    bbywu:

    If you're going to go the way of a Durametric interface, I'd datalog the boost pressure.  The dash gauge is incredibly inaccurate.

    Bob,

    1. Do you know if the boost pressure seen in Durametric is actually measured, or is it calculated?

    2.The inaccuracy of dash gauge that you saw, was it consistently low, or high, or was it a time lag? (I know about the artificial ceiling of 1 and 1.2 bar.) TIA


    --

    Regards,
    Can
    997 Turbo + Bilstein Damptronic ( Review ) + GIAC ECU Tune ( Fast as a torpedo & reversible to stock - Review ) + Cargraphic Exhaust ( Oh heavenly noise! )


     
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