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  #1  
Old 07-09-2000, 03:52 AM
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I came across this question from one of the Audi forum. One guys asked, why Audi S4 is a "Bi-Turbo", instead of "Twin-Turbo".

The only explanation I can think of is that "Twin-Turbo" uses 2 turbos, usually one is larger then another, spinning at different rev range to eliminate turbo lag, while "Bi-Turbo" uses 2 turbos on each bank of cylinders and spinning simutaniously(spelling??).....

What do you think??

Andy Kuo

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  #2  
Old 07-09-2000, 08:58 AM
MP
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I have always thought that different manufacturers call same things(at least the idea is same, there could be slight differencies) with different names like VTEC, Vanos, Variocam etc.
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  #3  
Old 07-09-2000, 02:19 PM
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Yes, I have thought that it's just some fancy names given by different auto makers for the same concept of design. However, I peek through S4's engine bay, there's turo on each side of bank, and 2 intercoolers feeding air, while MR2 Twin Turbo uses ONE intercooler on the side, and feeds both turbo. That's how I ended up with my conclusion above....

Andy Kuo

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  #4  
Old 07-09-2000, 08:57 PM
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I think that the different name theory applies here. I know that Maserati used the Bi-turbo name as well...

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  #5  
Old 07-10-2000, 06:48 PM
Nukta_Kupaya
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Akry, I belive you're right. The Audi A6 2.7T and the Audi S4 both use the 2.7L Bi-Turbo V6. From what I garnered from Audi, each bank of cylinders has it's own turbocharger.

-Nukta

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