what does biturbo really mean?
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Joined: Aug 2007
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2005 Cl65 AMG, 2004 S500, 2005 CLK500, 2005 Ml350
what does biturbo really mean?
how does it affect the engine, like how does it improve the engine , not just improving the horsepowerbut how does it make the engine what it is? 
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It's another word for twin turbos.
Turbocharging and supercharging are forced induction methods (as opposed to naturally aspirated) to force air into the engine to create incredible more amounts of power (but with added stress to an extent).
Your CL65 is turbo charged. You have two turbos that spin off the exhaust gasses sucking in air and forcing it through your engine filling your piston chambers with so much air pressure, it's incredible. I don't have a CL65, but I assume that it's very similar to a SL65 in that there is very little turbo lag.
You just push the throttle and you just MOVE off the line. It's because you have a lot of torque even when the turbos aren't on, so I can't explain to you how much force the turbos create, but I should remind you that the very reason we have "turbo lag" in smaller engined cars should be reason enough on how powerful turbos can be.
If I remember right, much of the tuning success for the Supra comes from it's strong engine block and the blocks ability to hold up to some serious turbocharging, much beyond what stock limits were.
Turbocharging and supercharging are forced induction methods (as opposed to naturally aspirated) to force air into the engine to create incredible more amounts of power (but with added stress to an extent).
Your CL65 is turbo charged. You have two turbos that spin off the exhaust gasses sucking in air and forcing it through your engine filling your piston chambers with so much air pressure, it's incredible. I don't have a CL65, but I assume that it's very similar to a SL65 in that there is very little turbo lag.
You just push the throttle and you just MOVE off the line. It's because you have a lot of torque even when the turbos aren't on, so I can't explain to you how much force the turbos create, but I should remind you that the very reason we have "turbo lag" in smaller engined cars should be reason enough on how powerful turbos can be.
If I remember right, much of the tuning success for the Supra comes from it's strong engine block and the blocks ability to hold up to some serious turbocharging, much beyond what stock limits were.
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W203 slightly modified
To make an engine you look at all the moving parts.
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MBs
Lots of torque from low rpm: 
570 Nm @ 1000 rpm
750 Nm @ 1500 rpm
1000 Nm @ 2000 to 4000 rpm
Graph: http://www.whnet.com/4x4/pix/M275_E60_2LA.jpg
570 Nm @ 1000 rpm
750 Nm @ 1500 rpm
1000 Nm @ 2000 to 4000 rpm
Graph: http://www.whnet.com/4x4/pix/M275_E60_2LA.jpg
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'19 E63S sedan
It's a V6 diesel with two small turbos on either side, as with a normal bi-turbo setup, plus a larger central turbo in the crotch of the V. The small turbos minimize turbo lag, and the large one takes over at higher RPMS and charge flow.
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From: San Jose area
'19 E63S sedan
Unlike a supercharger, which is mechanically driven by the engine, a turbocharger is driven by exhaust gasses. At low RPMs the turbo doesn't spin, and the resulting delay in torque multiplication is called turbo lag. One way to minimize turbo lag is to make the turbo system smaller. Smaller diameter piping will convey sufficient exhaust gas velocity to the compressor more quickly. But a smaller turbo makes less compression and torque.
Two solutions both use two turbo-chargers. The MB, Porsche, BMW, etc. system has two smaller turbos on either side of a V or horizontally opposed engine. Two smaller turbos spin faster than one large. The typical Japanese twin-turbo system uses one small and one large turbo for all (typically inline) cylinders. The small one mitigates turbo lag and the large one takes over at higher RPMs. The tri-turbo system in the 320 CDI experimental engine combines these configurations.
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SL55AMG, Ferrari 348, Ferrari Testarossa, Ferrari F40, Ferrari Mondial t, Ducati 916, Indycar
I can attest about the turbo lag from larger turbos, as my Indycar has a 2.8 liter Cosworth V8, with a HUGE single turbo. There is zero happening under 6500rpm...and then BANG! 750hp! The general launch technique in that car is 8000rpm and let the clutch out and feed in more gas. When you get it right it is very entertaining.
Modern turbo and SC cars are very easy to get BIG reliable hp/torque increases from simple ECU work...which definitely makes things fun.
