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  1. #1
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    Stock Max Boost Pressure?

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    Hello!
    What is the common observed max boost pressure on a completely stock 8V A3?
    What about stock except for stage 1 tune on 91 octane?
    What about stock except for stage 1 tune on 93 octane?

    Full disclosure, I'm trying to determine safe max boost pressures depending upon octane for a United Motorsport loaded tune 8V A3.
    Thanks!

  2. #2
    Veteran Member Four Rings MikTip's Avatar
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    I VCDS logged mine with stock and UM Stage 1 91 tune...2.6 bar...that day.
    Last edited by MikTip; 09-13-2018 at 01:01 PM.
    2015 S3

    2004 B6 A4 USP

  3. #3
    Established Member Three Rings ralphie_43's Avatar
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    Quote Originally Posted by MikTip View Post
    I VCDS logged mine with stock and UM Stage 1 91 tune...26.6 bar...that day.
    26.6 bar or psi?

    Sent from my SM-G930V using Audizine mobile app

  4. #4
    Veteran Member Four Rings MikTip's Avatar
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    Quote Originally Posted by ralphie_43 View Post
    26.6 bar or psi?

    Sent from my sm-g930v using audizine mobile app
    oops!

    2.66
    2015 S3

    2004 B6 A4 USP

  5. #5
    Established Member Three Rings ralphie_43's Avatar
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    Quote Originally Posted by MikTip View Post
    oops!

    2.66
    It's all good lol I was like i'm pretty sure it's not 26.6 bar but you never know

    Sent from my SM-G930V using Audizine mobile app

  6. #6
    Established Member Two Rings MichiganRS3's Avatar
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    Quote Originally Posted by MikTip View Post
    I VCDS logged mine with stock and UM Stage 1 91 tune...2.6 bar...that day.
    Really? 2.6 bar is like 38psi. Seems kinda high for an A3.
    `18 Mystic Blue Pearl Effect RS3
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  7. #7
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    1.8-1.9 bar is usually the upper limit for S3's stock IS38, but for IS20, I think it's 1.6 bar or 24 psi...

  8. #8
    Veteran Member Four Rings MikTip's Avatar
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    Quote Originally Posted by MichiganRS3 View Post
    Really? 2.6 bar is like 38psi. Seems kinda high for an A3.
    A week after I got my S3 United Motorsports tune... I VCDS data logged it as the tune changed the way the OE boost gauge displayed boost...so I was curious of what the boost actually was...



    Thats what VCDS showed...
    2015 S3

    2004 B6 A4 USP

  9. #9
    Established Member Two Rings
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    Quote Originally Posted by MikTip View Post
    A week after I got my S3 United Motorsports tune... I VCDS data logged it as the tune changed the way the OE boost gauge displayed boost...so I was curious of what the boost actually was...



    Thats what VCDS showed...
    That can't be right, anything close to 2.4 bar is pretty much an instant boom for IS38... 1.9 bar IMO is already pushing it...

  10. #10
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    Quote Originally Posted by larbel View Post
    That can't be right, anything close to 2.4 bar is pretty much an instant boom for IS38... 1.9 bar IMO is already pushing it...
    Perhaps the first bar is standard atmosphere? Then the 1.7ish bar over that is boost and equates to 24-25 PSI.

    Sent from my SM-G965U using Tapatalk

  11. #11
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    Quote Originally Posted by tdietro View Post
    Perhaps the first bar is standard atmosphere? Then the 1.7ish bar over that is boost and equates to 24-25 PSI.

    Sent from my SM-G965U using Tapatalk
    Oh yeah, that's right! Totally forgot VCDS does that LOL

  12. #12
    Established Member Two Rings MichiganRS3's Avatar
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    Quote Originally Posted by tdietro View Post
    Perhaps the first bar is standard atmosphere? Then the 1.7ish bar over that is boost and equates to 24-25 PSI.

    Sent from my SM-G965U using Tapatalk
    This makes mores sense. Iíve never used VCDS, this is kind of wonky way of reporting.
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  13. #13
    Veteran Member Four Rings MikTip's Avatar
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    substract about 1000 mbar from the total to get actual boost pressure

    1 bar = 14.7PSI = 1000mbar

  14. #14
    Registered Member One Ring
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    Thanks for all the good discussion!
    So would I be accurate in saying stock is around 18 psi, stage 1 91 octane is around 23 psi, and stage 1 93 octane is around 25 psi?
    These would all be maxes of course.

  15. #15
    Veteran Member Four Rings MikTip's Avatar
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    Quote Originally Posted by Hites View Post
    Thanks for all the good discussion!
    So would I be accurate in saying stock is around 18 psi, stage 1 91 octane is around 23 psi, and stage 1 93 octane is around 25 psi?
    These would all be maxes of course.
    I'm stage 1, 91 octane...United MotorSports tune...

    I would say the specific numbers depend on the tune...your location, and engine mods...
    2015 S3

    2004 B6 A4 USP

  16. #16
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    Quote Originally Posted by MikTip View Post
    I'm stage 1, 91 octane...United MotorSports tune...

    I would say the specific numbers depend on the tune...your location, and engine mods...
    With UM offering the loaded tune for the 8V, I'm trying to determine what max boost pressure can be run with what octane.
    Like if I were in a pinch and a gas station only had nothing higher than 87 available, which when mixed with a tank of 93 would likely equal 88 or 89, what max boost pressure could I drop it to? 19 or 20? IDK. Might need to experiment, it sounds like...

  17. #17
    Veteran Member Four Rings MikTip's Avatar
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    Quote Originally Posted by Hites View Post
    With UM offering the loaded tune for the 8V, I'm trying to determine what max boost pressure can be run with what octane.
    Like if I were in a pinch and a gas station only had nothing higher than 87 available, which when mixed with a tank of 93 would likely equal 88 or 89, what max boost pressure could I drop it to? 19 or 20? IDK. Might need to experiment, it sounds like...
    I think your splitting hairs here...and penny pinching on gas while trying to drive a turbo car thats suppose to be run on premium....

  18. #18
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    Quote Originally Posted by MikTip View Post
    I think your splitting hairs here...and penny pinching on gas while trying to drive a turbo car thats suppose to be run on premium....
    Correct me if I'm wrong, but starting in 2016, the A3 can run 87 octane. Obviously it'll pull timing like crazy if you drive it hard, but Audi says it can run 87. Sounds like this is uncharted territory.

  19. #19
    Veteran Member Four Rings MikTip's Avatar
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    Quote Originally Posted by Hites View Post
    Correct me if I'm wrong, but starting in 2016, the A3 can run 87 octane. Obviously it'll pull timing like crazy if you drive it hard, but Audi says it can run 87. Sounds like this is uncharted territory.
    The ECU adapts to the various octane/conditions...nothing new...just less performance, but only 4 octane worth.

    IMO if this is your main concern...dont buy a upgrade in power performance tune. Because you will burn more gas!
    2015 S3

    2004 B6 A4 USP



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