2011 wrx vs 2011 135i - Page 3
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This is a discussion on 2011 wrx vs 2011 135i within the Comparison: WRX vs World forums, part of the Community - Meet other Enthusiasts category; Originally Posted by SPT2011 Yea, on paper the 135i and the wrx/sti are identical 0-60 and quarter mile times. But ...

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    Quote Originally Posted by SPT2011 View Post
    Yea, on paper the 135i and the wrx/sti are identical 0-60 and quarter mile times. But really the sti or wrx will pull harder then the 135i (personally tested it my buddy owns a 135i). The 2011 135i is also BMW's fastest model compared to the older 135 and 335 models cuz of its single turbo with twin scroll.
    What is a twin scroll? How does it benefit, how is it different, and what are the disadvantages. I ate a 135i... but I also have an almost Stage 3 WRX... with almost 400awhp... lol it was fun though cause he thought he was billy bad ass in his beamer

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    Registered User SPT2011's Avatar
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    Twin scroll is no turbo lag at all. Throughout entire rpm is steady compared to ours that kicks in at 4 grand or w/e. No disadvantages... If it wasent so expensive I guarantee most of us wrx and sti owners would own the 135i...
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    Quote Originally Posted by SPT2011
    Twin scroll is no turbo lag at all. Throughout entire rpm is steady compared to ours that kicks in at 4 grand or w/e. No disadvantages... If it wasent so expensive I guarantee most of us wrx and sti owners would own the 135i...
    Twin scroll does not necessarily imply no turbo lag. There are plenty of TS kits for Subarus that don't see full spool until 5K+

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    Registered User Heide264's Avatar
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    Quote Originally Posted by SPT2011 View Post
    Twin scroll is no turbo lag at all. Throughout entire rpm is steady compared to ours that kicks in at 4 grand or w/e. No disadvantages... If it wasent so expensive I guarantee most of us wrx and sti owners would own the 135i...
    False.

    There was a good thread around here that turned into a twin scroll information session. I don't remember it off of the top of my head.

    Twin scroll's are more efficient generally speaking. This does not infer anything about their size relative (or 'spool' speed).

    You may be thinking of a centrifugal supercharger, where the output is linear from the getgo... However, even though the output is linear, you actually will get a much slower 'spool' than a turbo or other forms of supercharging.

    All forms of 'boost' have disadvantages, however, one way or another. The largest downside off hand of the twin scroll is the specific design requirements of the headers. Without headers designed specifically for twin scroll use, you'll lose most if not all of the advantages of the 'twin' scroll.


    On the BMW note, normally if you saw a car worth 60k, and somebody was giving it away for 40k... It most certainly would sway some buyers. Tends to happen. At the same time, if a WRX or STi was sold for the price of a Honda SI, I am sure many SI owners would be swayed as well.
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    without twin scroll headers... your up pipe wont fit the twin scroll turbine outlet. Period. End of story.

    Twin scroll turbos do spool faster... but they still do have lag. They're more efficient at putting that exhaust gas to use. Since our cars have exhaust "pulses" (that's why they have the boxer "rumble") there is some exhaust fighting (turbulence) in the R Manifold where the crosspipe connects. This disrupts some of the linearity of the exhaust, and creates additional un-needed back pressure. The twin scroll design eliminates this, and allows the alternating "pulses" to push the turbine wheel constantly. This creates better spool characteristics. It's a lot more complex than that... but that's just a little overview of why it spools better.
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    Ah very cool... I love to learn that kind of stuff, How much power are they putting to the wheels from the factory?

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    Quote Originally Posted by Sinister View Post
    without twin scroll headers... your up pipe wont fit the twin scroll turbine outlet. Period. End of story.

    Twin scroll turbos do spool faster... but they still do have lag. They're more efficient at putting that exhaust gas to use. Since our cars have exhaust "pulses" (that's why they have the boxer "rumble") there is some exhaust fighting (turbulence) in the R Manifold where the crosspipe connects. This disrupts some of the linearity of the exhaust, and creates additional un-needed back pressure. The twin scroll design eliminates this, and allows the alternating "pulses" to push the turbine wheel constantly. This creates better spool characteristics. It's a lot more complex than that... but that's just a little overview of why it spools better.
    again, as noted above, "twin scroll" has nothing to do with spooling faster. it has more to do with efficiency of exhaust gas management. that's why the single turbo twin scroll 2011 135i can achieve the same hp/torque numbers as the previous twin-turbo motor that was in the 2010 135i while being more efficient, relatively speaking.

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