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Message: [QUOTE="drunk on diesel, post: 1002885, member: 2558"] they've got it spec'd correctly the previous design had two smaller compressor wheels essentially back to back on the same shaft. smaller diameter = lower moment of inertia = quicker spool up but due to the more complex design, they were having higher than desired failure rate of a more expensive turbo... it's also more difficult/expensive to rebuild so, they spec'd essentially the same compressor map in a traditional style compressor wheel. Due to the larger diameter, spool up suffers slightly, but failure rates should be effectively zero [/QUOTE]

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