Doubt in turbocharger decision (bnr s2 vs s3 vs cst4)

Discussion in 'Mazdaspeed 3/6 Engine' started by mr.crumpet, Apr 2, 2020.

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  1. mr.crumpet

    mr.crumpet Greenie N00B Member

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    Hi everyone,

    First of all i want to say that i have stock engine with some mods:
    - 2.25" inlet pipe
    - K&N high flow air filter
    - Testpipe
    - BOV

    mods to be done to support bigger turbo:
    - HPFP internals
    - 3" downpipe
    - 3.0 map sensor and harness
    - 3 ports boost controller
    - fmic intercooler
    - cobb accessport and custom tune
    - engine rear mount

    My goal is to get around 330-340cv or the maximum power always with safety and without putting the engine integrity at risk.

    So the question is: In my case which turbo should i go for?
    Any suggestions?
    Bear in mind that I am not planning to build the engine in the future.

    Thanks in advance guys
     
  2. Awafrican

    Awafrican Moderator Gold Member

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    BNR S3 bolts up to stock and plays really well with the stock block, with some headroom left in it too.

    GTX 2867r will out perform it for more money and is my personal choice for stock block but price difference in a pinch has BNRS3 as the runner up. GTX2867r is good for up to 400hp with meth or e85 again,headroom on-top of the stock block if you did decide you wanted to build the block at some point.

    With a good tuner, either of those turbos will make your car sing and stay within stock block limits don't forget you'll need a bigger intake as well.

    I myself run stock block and don't want to build and when I turbo upgrade these 2 are at the top of my list with the same.mod as your end game except I plan to stay TMIC.
     
    Awafrican, via a mobile device, Apr 3, 2020
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  3. Raider

    Raider Administraider Administrator Platinum Member

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    I love my Corksport turbo. I beta tested the original. Tons of miles, still a blast. Lots of improvements since then too.
     
    Raider, via a mobile device, Apr 3, 2020
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  4. SharksInSpace

    SharksInSpace Planets and shit. Silver Member

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    I ran CST4 on my stock block and on e30, dyno'd at 375whp, it was a ton of fun. If budget isn't an issue then a Gen 2 GTX would probably be the ultimate, but you'll spend like twice as much total compared to BNR or CS
     
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