TwinTurbo.NET: Nissan 300ZX forum - basic explanation
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Subject basic explanation
     
Posted by ZLover4Life on July 08, 2004 at 12:55 AM
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In Reply To Re: about downpipes posted by deesz on July 07, 2004 at 11:53 PM
     
Message The air coming through the wastegate is generally straight. The air coming off the turbine is generally spinning very fast. Spinning air doesn't like straight air, so when they meet in a single tube downpipes, they fight, causing a lot of turbulance which slows down the turbine a little. Split downpipes give the spinning exhaust gasses time to straighten out a little before introducing them to the wastegate gasses (and it does so further away from the turbo, so any turbulance is remote), resulting in ~500rpm better spooling. If your turbos start spooling 500rpms sooner, your powerband will be more broad.

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