ATS compound turbo kit

sootie

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But couldn't you overspeed the bottom turbo though if you're pushing more boost through it with a bigger turbo?

you are pushing air thru it, not excessively over-speeding it. Its not making the boost itself. Remember, it is a pressurized system-its not a lineup of fans lol
 

Six_Sloww

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If the 15+ turbine was so restrictive the 65+mm compressor wheels wouldn't be so effective.

1:1 drive/boost pressures might be ideal in all out race situations but there's nothing wrong with making some back pressure to get things spooled up.
 
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06FX4

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they do for 11-14 alot, which those turbos are probably not super efficient like the 15+
 

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