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TWIN TURBO Camaro ZL1 FIRST STARTUP!!! (SO EPIC)
TWIN TURBO Camaro ZL1 FIRST STARTUP!!! (SO EPIC)
Published: 2018/07/11
Channel: GuitarmageddonZL1
Big Twin Turbo Engines
Big Twin Turbo Engines
Published: 2017/05/22
Channel: Car News Central
TWIN TURBO Camaro ZL1 FIRST DYNO RESULTS!!
TWIN TURBO Camaro ZL1 FIRST DYNO RESULTS!!
Published: 2018/07/17
Channel: GuitarmageddonZL1
I TWIN TURBO
I TWIN TURBO'D MY LAMBORGHINI!!! **HUGE MISTAKE**
Published: 2017/08/15
Channel: Vehicle Virgins
Twin Turbo Mustang vs Texas Streets (SMURF BEATS EVERYTHING) - TX2K18
Twin Turbo Mustang vs Texas Streets (SMURF BEATS EVERYTHING) - TX2K18
Published: 2018/05/20
Channel: Street Car Video
How Twin Turbos Work - All The Boost!
How Twin Turbos Work - All The Boost!
Published: 2014/01/15
Channel: Engineering Explained
FIREBREATHING 280z - Twin Turbo BEAST!
FIREBREATHING 280z - Twin Turbo BEAST!
Published: 2017/10/16
Channel: 1320video
Kye Kelley AfterShock vs Monza twin turbo Camaro No Prep Kings 2 Topeka Kansas
Kye Kelley AfterShock vs Monza twin turbo Camaro No Prep Kings 2 Topeka Kansas
Published: 2018/06/25
Channel: National No Prep Racing Association
88GLAM - Twin Turbo (Reloaded)
88GLAM - Twin Turbo (Reloaded)
Published: 2018/04/20
Channel: Nav Audio
MOST EXTREME TWIN TURBO LAMBORGHINI EVER?  *INSANE FLYBYS SHOOTING FLAMES*
MOST EXTREME TWIN TURBO LAMBORGHINI EVER? *INSANE FLYBYS SHOOTING FLAMES*
Published: 2018/05/25
Channel: DailyDrivenExotics
2400HP Twin Turbo Corvette at TX2K15 Tearing up the Streets!
2400HP Twin Turbo Corvette at TX2K15 Tearing up the Streets!
Published: 2015/05/19
Channel: ScorchTV
Twin Turbo Mustang vs Hellcat, and fast BMW M6 takes on the WORLD! INSANE STREET RACING!!!
Twin Turbo Mustang vs Hellcat, and fast BMW M6 takes on the WORLD! INSANE STREET RACING!!!
Published: 2017/06/18
Channel: Street Car Video
Stephanie
Stephanie's Twin Turbo Mustang is INSANE! - Twin Turbo Coyote Mustang Review!
Published: 2018/04/21
Channel: ThatDudeinBlue
[HOONIGAN] DT 075: 1200HP Twin Turbo Diesel Burnouts (Old Smokey F1)
[HOONIGAN] DT 075: 1200HP Twin Turbo Diesel Burnouts (Old Smokey F1)
Published: 2017/07/17
Channel: TheHoonigans
Twin Turbo GMC
Twin Turbo GMC
Published: 2015/11/12
Channel: GrinderTV
NEVER ENOUGH POWER -  1200HP Twin-Turbo C6 Corvette - Raiti
NEVER ENOUGH POWER - 1200HP Twin-Turbo C6 Corvette - Raiti's Rides
Published: 2018/06/01
Channel: Raiti's Rides
Twin Turbo Duramax - 10 Second Old School Diesel C10!
Twin Turbo Duramax - 10 Second Old School Diesel C10!
Published: 2018/07/06
Channel: 1320video
REVEALING THE RED BULL TWIN TURBO LAMBORGHINI SLAMMED ON BAGS! *900 WHP*
REVEALING THE RED BULL TWIN TURBO LAMBORGHINI SLAMMED ON BAGS! *900 WHP*
Published: 2018/07/02
Channel: DailyDrivenExotics
Mental 1000HP Twin Turbo Lamborghini Huracan Avio vs the Police
Mental 1000HP Twin Turbo Lamborghini Huracan Avio vs the Police
Published: 2017/12/11
Channel: FULL METAL AUTO
Twin Turbo Silverado STREET RACING! (1500hp)
Twin Turbo Silverado STREET RACING! (1500hp)
Published: 2017/07/10
Channel: 1320video
PIPER RIDES IN A TWIN TURBO 300ZX "DEVIL Z" & 700+ HP SHELBY GT500
PIPER RIDES IN A TWIN TURBO 300ZX "DEVIL Z" & 700+ HP SHELBY GT500
Published: 2016/02/23
Channel: RWYB RACING
WhipAddict: 1300hp+ Twin Turbo LS Chevy Caprice Landau Tearing up the Street in Atlanta
WhipAddict: 1300hp+ Twin Turbo LS Chevy Caprice Landau Tearing up the Street in Atlanta
Published: 2018/05/22
Channel: WhipAddict
YOU WOULD NEVER GUESS HOW MUCH POWER THIS LS TWIN TURBO CAPRICE ON 26 INCH RIMS MAKES!
YOU WOULD NEVER GUESS HOW MUCH POWER THIS LS TWIN TURBO CAPRICE ON 26 INCH RIMS MAKES!
Published: 2018/07/16
Channel: Jmalcom2004
Big Twin Turbo Engine Cars
Big Twin Turbo Engine Cars
Published: 2018/04/07
Channel: Car News Central
The 2017 Camaro ZL1 TWIN TURBO BUILD BEGINS!!
The 2017 Camaro ZL1 TWIN TURBO BUILD BEGINS!!
Published: 2018/06/30
Channel: GuitarmageddonZL1
Silverado Twin Turbo: Service Appointment
Silverado Twin Turbo: Service Appointment
Published: 2015/10/26
Channel: Armageddon Turbo
Turbos: How They Work | Science Garage
Turbos: How They Work | Science Garage
Published: 2018/03/21
Channel: Donut Media
Twin Turbo SRT8 Jeep Runs Over Every Truck on the Premises! 🐌 🐌
Twin Turbo SRT8 Jeep Runs Over Every Truck on the Premises! 🐌 🐌
Published: 2017/09/01
Channel: BigKleib34
Twin Turbo, Supercharged and Nitrous - Ford GT
Twin Turbo, Supercharged and Nitrous - Ford GT
Published: 2014/11/21
Channel: High Tech Corvette
10 Extreme  Crazy Twin Turbo Cars
10 Extreme Crazy Twin Turbo Cars
Published: 2016/12/31
Channel: Car News Central
Twin Turbo Lamborghini Huracan Performante
Twin Turbo Lamborghini Huracan Performante
Published: 2018/05/29
Channel: SoCal Exotics
Datsun 240Z Twin Turbo VQ37VHR Swap and Rebuild Project
Datsun 240Z Twin Turbo VQ37VHR Swap and Rebuild Project
Published: 2018/05/20
Channel: Build Diaries
Monza Twin turbo Camaro vs David Bird Jones at Memphis No Prep Kings 2
Monza Twin turbo Camaro vs David Bird Jones at Memphis No Prep Kings 2
Published: 2018/07/17
Channel: National No Prep Racing Association
Will My Car Make It?? Camaro ZL1 Twin Turbo Build - Part 3
Will My Car Make It?? Camaro ZL1 Twin Turbo Build - Part 3
Published: 2018/07/09
Channel: GuitarmageddonZL1
Amg E63 vs Fiat Uno Turbo, Subaru STI, Audi RS6 & others
Amg E63 vs Fiat Uno Turbo, Subaru STI, Audi RS6 & others
Published: 2018/07/17
Channel: TwinTurboChile
1969 Camaro SS Twin Turbo Supercharged Nitrous Breathing Monster
1969 Camaro SS Twin Turbo Supercharged Nitrous Breathing Monster
Published: 2012/06/18
Channel: ScottieDTV
Cleetus McFarland
Cleetus McFarland's Twin Turbo 427ci Corvette Kart
Published: 2018/05/14
Channel: TheHoonigans
2018 TWIN TURBO MUSTANG takes on 900hp ZR1, TT Camaro, YSI C6 & 850hp Paxton 5.0 on THE STREET!!!
2018 TWIN TURBO MUSTANG takes on 900hp ZR1, TT Camaro, YSI C6 & 850hp Paxton 5.0 on THE STREET!!!
Published: 2018/04/29
Channel: Street Car Video
Porsche 911 GT1-98 Twin Turbo Flat-6 Engine Sound - 1998 24h of Le Mans winner at FoS 2018!
Porsche 911 GT1-98 Twin Turbo Flat-6 Engine Sound - 1998 24h of Le Mans winner at FoS 2018!
Published: 2018/07/19
Channel: 19Bozzy92
7-Second TWIN TURBO Camaro - Rocky Mountain Race Week!
7-Second TWIN TURBO Camaro - Rocky Mountain Race Week!
Published: 2016/08/09
Channel: 1320video
TWIN TURBO LS STREETCAR FIRST DAY OUT + S10 Budget Build Update | High HP Chevy Nova Cruising
TWIN TURBO LS STREETCAR FIRST DAY OUT + S10 Budget Build Update | High HP Chevy Nova Cruising
Published: 2018/05/20
Channel: SPPTV
Twin Turbo JEEP - It SOUNDS AMAZING!
Twin Turbo JEEP - It SOUNDS AMAZING!
Published: 2017/10/05
Channel: 1320video
TWIN TURBO HEMI HELLCAT "VIXEN" GRABS THE WIN!
TWIN TURBO HEMI HELLCAT "VIXEN" GRABS THE WIN!
Published: 2018/06/25
Channel: TheRacingVids
5000KR VOLVO 940 TWIN TURBO M52b25 VEEMER IS DONE, LAUNCH CONTROLL ON!
5000KR VOLVO 940 TWIN TURBO M52b25 VEEMER IS DONE, LAUNCH CONTROLL ON!
Published: 2018/07/17
Channel: ABM
the Worlds 1st Twin Turbo Sleeper Honda (Stock Engine)
the Worlds 1st Twin Turbo Sleeper Honda (Stock Engine)
Published: 2017/05/19
Channel: Syrus54
Driving GuitarmageddonZL1
Driving GuitarmageddonZL1's TWIN TURBO ZL1 to Kentucky!
Published: 2018/07/18
Channel: Complete Street Performance
2000+ HP TWIN TURBO Nova Dominates!
2000+ HP TWIN TURBO Nova Dominates!
Published: 2018/07/20
Channel: Street Racing Channel
Aussie Twin Turbo Chevelle | The Full Story | Street Machine
Aussie Twin Turbo Chevelle | The Full Story | Street Machine
Published: 2016/12/24
Channel: STREETMACHINETV
Twin Turbo SRT8 300C vs THE STREETS!
Twin Turbo SRT8 300C vs THE STREETS!
Published: 2017/12/01
Channel: 1320video
Aussie TURBO OVERLOAD - 1300hp Twin Turbo CHEVELLE
Aussie TURBO OVERLOAD - 1300hp Twin Turbo CHEVELLE
Published: 2016/10/10
Channel: 1320video
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WIKIPEDIA ARTICLE

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Twin-turbo or biturbo refers to a turbocharged engine in which two turbochargers compress the intake charge. The most common layout features two identical turbochargers in parallel; other twin-turbo layouts include sequential and staged turbocharging, the latter of which is used in diesel auto racing applications.

Parallel twin-turbo[edit]

3.5 Ford EcoBoost engine (Twin Turbo)

Paralleled twin-turbo refers to the turbocharger configuration in which two identical turbochargers function simultaneously, splitting the turbocharging duties equally. Each turbocharger is driven by half of the engine's spent exhaust energy. In most applications, the compressed air from both turbos is combined in a common intake manifold and sent to the individual cylinders. Usually, each turbocharger is mounted to its own individual exhaust/turbo manifold, but on inline-type engines both turbochargers can be mounted to a single turbo manifold. Parallel twin turbos applied to V-shaped engines are usually mounted with one turbo assigned to each cylinder bank, providing packaging symmetry and simplifying plumbing over a single turbo setup. When used on inline engines, parallel twin turbos are commonly applied with two smaller turbos, which can provide similar performance with less turbo lag than a single larger turbo. Some examples of parallel twin-turbo inline engines are Nissan's RB26DETT, BMW's N54 and Volvo's B6284T and B6294T. Some examples of V formation engines with parallel twin-turbos include Mitsubishi's 6A12TT, 6A13TT and 6G72TT; Nissan's VG30DETT and VR38DETT; and Audi's 1997-2002 S4 (B5), 1997-2005 A6, and 2003-2017 RS6.

While a parallel twin-turbo set-up theoretically has less turbo lag than a single turbocharger set up, this is not always the case due to many factors.[citation needed] Marginally reduced combined inertial resistance,[citation needed] simplified exhaust plumbing, and the simultaneous spooling of both turbos means that there can still be a noticeable bit of lag, especially in high-flow turbo/high boost applications. Some ways to counter this are to use a light pressure set up with smaller turbos, where the turbos are designed to output less boost but spool earlier. While this setup sacrifices some top end power, it still has less lag than a similar engine with a single turbo set up making the same power. Another system would be the use of variable geometry turbochargers. This system changes the angle of the guide vanes depending on the exhaust pressure, giving the system excellent power throughout the rev range. Once used mainly in turbocharged diesel engines, Chrysler was the first to use it in mass-production gasoline-powered vehicles with the Shelby CSX, debuted in 1989.

It is possible to use parallel operation with more than two turbochargers. Two such examples are the Bugatti EB110 and Bugatti Veyron, both of which run four turbochargers in parallel. The EB110 runs 4 turbos on a 3.5 litre V12 engine, producing 542 hp (404 kW) at 8000 rpm, while the Veyron uses an 8.0 litre 16 cylinder engine to generate 1,001 PS (736 kW; 987 hp). The Bugatti Veyron Super Sport uses the quad-turbo 8.0 W16 engine that produces 1216 PS (894 kW; 1,200 hp).

Sequential turbocharging[edit]

BMW 3 Series Diesel turbo setup (Sequential turbo)

Sequential turbos refer to a set-up in which the engine uses one turbocharger for lower engine speeds, and a second or both turbochargers at higher engine speeds. Typically, larger high-flow turbochargers are not as efficient at low RPM, resulting in lower intake manifold pressures under these conditions. On the other hand, smaller turbos spool up quickly at low RPM but cannot supply enough air at higher engine speed. During low to mid engine speeds, when available spent exhaust energy is minimal, only one relatively small turbocharger (called the primary turbocharger) is active. During this period, all of the engine's exhaust energy is directed to the primary turbocharger only, providing the small turbo's benefits of a lower boost threshold, minimal turbo lag, and increased power output at low engine speeds. As RPM increases, the secondary turbocharger is partially activated in order to pre-spool prior to its full utilization. Once a preset engine speed or boost pressure is attained, valves controlling compressor and turbine flow through the secondary turbocharger are opened completely. (The primary turbocharger is deactivated at this point in some applications.) In this way a full twin-turbocharger setup provides the benefits associated with a large turbo, including maximum power output, without the disadvantage of increased turbo lag.

Sequential turbocharger systems provide a way to decrease turbo lag without compromising ultimate boost output and engine power. Perhaps the most noteworthy application of this system is the fourth-generation Toyota Supra (1993-1998), which is generally regarded as having the most reliable sequential turbo system yet fitted to a production automobile, with a reported failure rate of less than 1% as of 2011.[citation needed] Other examples of cars with a sequential twin-turbo setup include the 1986-1988 Porsche 959, the 1990-1995 Eunos Cosmo JC, 1992-2002 Mazda RX-7 FD3S Turbo (13B-REW engine), the 1994-2005 JDM Subaru Legacy GT, GT-B & B4 RSK (EJ20TT engine), and the Peugeot 407 2.2 HDi. GM has filed a patent for a sequential twin-turbo system that uses a new bypass valve design said to optimize exhaust flow to the turbines of both turbochargers. [1] According to the 2016 patent description, the exhaust manifold features two outlets with one directing exhaust gases to the turbine of the high-pressure turbocharger, while the second exhaust manifold outlet directs exhaust gases to the turbine of the low-pressure turbocharger via a connecting channel. Additionally, exhaust gas exiting the high-pressure turbine is directed to the inlet of the low-pressure turbine. The new bypass system features two throttle valves located on the same spindle mounted perpendicular to each other. With the throttle valves mounted on the same plane, one valve opens to direct exhaust gas flow to one of the turbochargers while the other valves simultaneously blocks exhaust gas flow to the other turbocharger. The vehicle ECU (electronic control unit) sends a signal to the spindle’s actuator to rotate the throttle valves based on rpm and load. GM says the new design allows engineers to optimize exhaust gas flow to both turbines without the compromises of traditional sequential turbocharger systems. Additionally, the system could utilize a variable-geometry turbine or a fixed-geometry turbine on the high-pressure turbo.

Staged turbocharging[edit]

A sequential turbo can also be of use to a system where the output pressure must be greater than can be provided by a single turbo, commonly called a staged twin turbo system. In this case, multiple similarly sized turbochargers are used in sequence, but both operate constantly. The first turbo boosts pressure as much as possible (for example to three times the intake pressure). Subsequent turbos take the charge from the previous stage and compress it further (for example to an additional three times intake pressure, for a total boost of nine times atmospheric pressure). This configuration is commonly found on piston engine aircraft which usually do not need to rapidly raise and lower engine speed (and thus where turbo lag is not a primary design consideration), and where the intake pressure is quite low due to low atmospheric pressure at altitude, requiring a very high pressure ratio. High-performance diesel engines also sometimes use this configuration, since diesel engines do not suffer from pre-ignition issues and can use significantly higher boost pressure than Otto cycle engines.

Advantages in diesel emissions[edit]

While spark ignition engines have fallen out of favor of the sequential turbo design,[citation needed] many diesel companies now make engines with sequential turbos in order to reduce emissions.

See also[edit]

References[edit]

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