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#342743 - 16th Aug 2009 6:58pm New BMW "M" Manifold to get rid of Turbo Lag...
StuyMac Offline

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Registered: 24th Nov 2003
Posts: 12002
Loc: Wirralshire
Found this quite interesting in how zee germans are trying to minimise lag through clever manifold design in the new V8 twin turbo engine used in the X6 M

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#342747 - 16th Aug 2009 7:08pm Re: New BMW "M" Manifold to get rid of Turbo Lag... [Re: StuyMac]
Sanchez Offline

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Registered: 17th Dec 2003
Posts: 8019
Loc: my house
clever stuff, just wish they would explane it in laman terms raftl
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#342766 - 16th Aug 2009 9:15pm Re: New BMW "M" Manifold to get rid of Turbo Lag... [Re: Sanchez]
Neston_Vasey Offline
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Registered: 31st Oct 2008
Posts: 61
Loc: Wirral
If I have read it right, the double R-R + L-L mean two cylinders fire at once, giving the turbo twice as much gas as just one cylinder firing meaning that the turbo will be forced to spin earlier, thus giving less lag.
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#342781 - 16th Aug 2009 10:38pm Re: New BMW "M" Manifold to get rid of Turbo Lag... [Re: Neston_Vasey]
diggingdeeper Offline

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Registered: 9th Jul 2008
Posts: 10375
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Originally Posted By: Neston_Vasey
If I have read it right, the double R-R + L-L mean two cylinders fire at once, giving the turbo twice as much gas as just one cylinder firing meaning that the turbo will be forced to spin earlier, thus giving less lag.
They fire in succession on the same turbo, so the exhaust burbling sound happens at the turbo as well, this pulsing effect is supposed to improve run-up of the turbo. In some ways I can see how it helps, in other ways the average flow is going to be the same, so whilst it may help, I can't see it doing much.
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