Safe levels for BNR S3 on stock block ?

Discussion in 'Mazdaspeed 3/6 Engine' started by Jtotheonah, Jul 23, 2020.

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  1. Jtotheonah

    Jtotheonah Silver Member

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    Hello all, I am considering getting a BNR s3 on my stock block. Was originally scared of upgrading turbo on stock internals, but have heard it can be safe if the torque is delivered in a certain way and boost is kept at a conservative level ? Does anyone have any experience with tuning their bnr s3 on a stock block with longer term reliability ?
     
  2. Awafrican

    Awafrican Moderator Silver Member

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    Yes there are many threads about this subject. Ie what turbo do I get, k04 dying, BNRS3?
    In the same section you posted this thread in, did you even try again look? Here are some other threads for you.

    https://www.mazdaspeeds.org/index.php?threads/turbo-thoughts.10566/ further down https://www.mazdaspeeds.org/index.php?threads/gtx3076r-good-for-stock-block.10356/ and again https://www.mazdaspeeds.org/index.p...ocharger-decision-bnr-s2-vs-s3-vs-cst4.10114/
    Again this time S4 stock block https://www.mazdaspeeds.org/index.php?threads/turbo-replacement-question.4021/

    Yes the S3 is absolutely fine with the stock block, Infact it's more than fine it's a very commonly recommend upgrade/replacement for the k04 because of how well it does to increase power but play with the block well. any reputable speed tuner that you say BNRS3, stock block, I want to keep it that way will give you an appropriate power curve.

    /Thread
     
    Awafrican, via a mobile device, Jul 23, 2020
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  3. Easter Bunny

    Easter Bunny Professional Engineer Platinum Member

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    The maximum horsepower recommended by Mazda is 263 measured at the crank.
     
    Easter Bunny, via a mobile device, Jul 23, 2020
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  4. anthony

    anthony Greenie Member

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    aim for 400whp/350wtq with meth or ethanol of course
     
  5. Jtotheonah

    Jtotheonah Silver Member

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    Thank you Awafrican, I did look it up but didn't find these exact threads.
     
  6. Awafrican

    Awafrican Moderator Silver Member

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    Now what they didn't answer as for power levels in the threads Anthony and easterbunny have.

    Enjoy the BNRS3 on the block :) personally that's my turbo choice as well when my k04 dies or I have the free cash whichever comes first
     
    Awafrican, via a mobile device, Jul 24, 2020
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  7. Cfoldone

    Cfoldone Platinum Member

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    I wanted to chime in...thank you for the links. I'm in the same boat. With k04, thinking I gotta find more boost..CHEAP. sure.....
     
    Cfoldone, via a mobile device, Jul 24, 2020
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  8. Awafrican

    Awafrican Moderator Silver Member

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    Bnrs2 is also a great replacement and slight upgrade from the stock k04 if you really want things to last and just have a little more oomph from the k04, BNR also does good k04 remans
     
    Awafrican, via a mobile device, Jul 24, 2020
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  9. JohnnyTightlips

    JohnnyTightlips Platinum Member

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    S3 is a perfect turbo to have fun with stock motor and will light up very similar to KO4.
     
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  10. jsilva

    jsilva Silver Member

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    Forgive my ignorance, but are you serious? I’m just confused because I’m sure I’ve read that others limited horsepower on a stock block but it was over 300. And of course the Speed6 apparently has 274.
     
    jsilva, via an iPhone, Jul 24, 2020
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  11. Easter Bunny

    Easter Bunny Professional Engineer Platinum Member

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    No I'm 100% serious Mazda spent a ton of money designing and manufacturing these motors to be reliable and durable making 263 horsepower at the crank
     
    Easter Bunny, via a mobile device, Jul 24, 2020
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  12. jsilva

    jsilva Silver Member

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    Ok, thanks! Once I’m able to get a new engine for mine I had also been pondering a few minor upgrades and a tune so what you’ve said has encouraged me to keep it close to stock :) I enjoy fast cars but this one needs to also be semi-reliable.
     
    jsilva, via an iPhone, Jul 24, 2020
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  13. Cfoldone

    Cfoldone Platinum Member

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    S3 spool vs k04..That's really my most sought at answer.. Except for a super cheap China DP to maybe install. Ive done about as much as can be expected from k04...so I have to either get it....or get the 63 turbo corvair spyder I've got sitting in service bay now running well...... :()
     
    Cfoldone, via a mobile device, Jul 24, 2020
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  14. Awafrican

    Awafrican Moderator Silver Member

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    Two posts up from yours is this:
    "Light up" refers to spool.....it's very similar to the k04 ie don't worry about it yes it will be within 100-200 rpm slower for full boost, buts it's also more boost at that point so I say again don't worry about it and the BNRS3 is absolutely wonderful with the stock block
     
    Awafrican, via a mobile device, Jul 24, 2020
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