Twin Scroll Sceptics BMW X5 M owns you....
Dec 17, 2009, 09:36 AM
#46
I bought my 35R before the FP red was even an option!Billet might be in the future, I wonder who could possibly source me a nice billet wheel and has the resources to install it on my current CHRA... I wonder...
Scorke
Dec 17, 2009, 06:55 PM
#50
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Wonder if this engine will find it way into the new M5 or even M3 engine bays?
With the massive front end of the X5 and X6, air to air IC will be alot more efficient and practical. ; )
With the massive front end of the X5 and X6, air to air IC will be alot more efficient and practical. ; )
Dec 17, 2009, 10:57 PM
#53
The 4.4L V8 TT basically has a flat torque curve from 1800-5000 rpms or so. Something crazy.... but to get it to spool that fast, it's gotta be using some relatively small turbos. Though they're still good enough for 555hp or whatever the engine is rated at. And you know there's more power in them. Maybe 650hp crank with max torque at 1800rpms?
So that's sort of like a 2.2L making 325 crank able to make max boost at 1800rpms (lugging it of course).
So that's sort of like a 2.2L making 325 crank able to make max boost at 1800rpms (lugging it of course).
Dec 18, 2009, 06:29 AM
#54
I am sorry knowledge offends you. Compression ratio dictates boost pressure and power needs as well, it starves off detonation but requires more boost, they could be using smaller turbos which only spike to that level and drop off which is almost certainly the case especially if they are boasting 0 spool-up time, mostly for instant boost response and torque hopefully that didn't offend you.
The 4.4L V8 TT basically has a flat torque curve from 1800-5000 rpms or so. Something crazy.... but to get it to spool that fast, it's gotta be using some relatively small turbos. Though they're still good enough for 555hp or whatever the engine is rated at. And you know there's more power in them. Maybe 650hp crank with max torque at 1800rpms?
So that's sort of like a 2.2L making 325 crank able to make max boost at 1800rpms (lugging it of course).
So that's sort of like a 2.2L making 325 crank able to make max boost at 1800rpms (lugging it of course).
Ahem.....
Dec 18, 2009, 08:17 AM
#55
So we agree I must have missed your post in skimming.
I'll make another comparison however to show the effect of twinscroll. The Audi 2.0T probably has a similar torque curve with max torque/boost hitting at ~1800rpms or so, is now rated at 211hp. It uses a regular open turbine housing.
The 2.2L, 4-cyl (half of the 4.4L V8) BMW has a similar torque curve while being rated at effectively 277.5 (half of V8 555hp). 10% larger displacement, way more than 10% power over the Audi 2.0 while still have similar spool-up. So bigger turbo with twin-scroll, same spool as smaller regular turbo that makes less power.
I must have missed your post in skimming.I'll make another comparison however to show the effect of twinscroll. The Audi 2.0T probably has a similar torque curve with max torque/boost hitting at ~1800rpms or so, is now rated at 211hp. It uses a regular open turbine housing.
The 2.2L, 4-cyl (half of the 4.4L V8) BMW has a similar torque curve while being rated at effectively 277.5 (half of V8 555hp). 10% larger displacement, way more than 10% power over the Audi 2.0 while still have similar spool-up. So bigger turbo with twin-scroll, same spool as smaller regular turbo that makes less power.
Dec 31, 2009, 05:15 PM
#57
I6 twinscroll single turbo:
BMW unveils single turbo N55 six-cylinder engine for new 5-series GT
BMW's latest engine dubbed the N55 is a twin scroll single turbo engine which boasts 306HP and 400Nm of torque out of a 3.0 litre inline 6 cylinder engine. Sound familiar? Yup this is a similar amount of power from the N54 of 335i/135i fame, but now using the new twin-scroll technology BMW can achieve this power from the use of only one turbo.
This is not simply a more efficient engine, but it achieves the similar amount of power with quicker throttle response and max power lower in the rev range (1200rpm).
What is twin-scroll?
Dual side by side exhaust inlets feed into a single housing in this setup. Because there are now two exhaust inlets being fed into the housing the exhaust channel can be smaller given more precise control of the velocity of air flow.
Valvetronic -- finally
Yes valvetronic is back in BMW engines again, due to technical reasons the engineers weren't able to use valvetronic correctly with the N54 but have finally overcome whatever obstacles were in their way and now it returns to the N55 with direct injection.
This engine is making its debut on the 535i GT but as in BMW fashion will likely filter down the range and take its place in the 135i, 335i, 535i, 735i, etc..
Quote:
BMW’s current N54 series straight-six engine is one of the most praised engines in the industry today, having taken out the coveted International Engine of the Year award last year and appearing in a vast array of BMW models. With the unveiling of the new 5-series GT last week, BMW has announced a new variation of the 3.0L engine which will debut in the crossover at the end of the year.
The N54 features a twin-turbocharging system, as well as direct-fuel injection and BMW’s own Valvetronic technology, and in its most potent configuration develops up to 326hp (243kW) at 5,800rpm and 332lb-ft (450Nm) of torque from as low as 1,500rpm. BMW’s new variation on the engine, labeled the N55, is based on the same basic engine block and valve system but only sports a single turbocharger. It is the world’s first engine to combine turbocharging, direct fuel injection and fully variable Valvetronic valve management developed by BMW.
Peak output is still a healthy 306hp (225kW) at 5,800rpm and 295lb-ft (400Nm) of torque from an even lower 1,200rpm. Furthermore, the new N55 is also said to be more fuel-efficient than the N54 though no independent test results have been produced.
As previously mentioned, the N55 engine will debut in the 535i 5-series GT along with an eight-speed automatic transmission. This model will be able to accelerate from 0-100km/h in around 6.3 seconds and is rated at 26mpg (9L/100km) in fuel economy.
http://www.motorauthority.com/bmw-un...series-gt.html
----------------------------------------------------------------
V8 twinscroll-biturbo:
heres a pic of the v8 twinscroll-twinturbo config:
and cylinder pairing:
more info here: BimmerFile Archive Exclusive: The NEW ///M Motor in Depth
BMW unveils single turbo N55 six-cylinder engine for new 5-series GT
BMW's latest engine dubbed the N55 is a twin scroll single turbo engine which boasts 306HP and 400Nm of torque out of a 3.0 litre inline 6 cylinder engine. Sound familiar? Yup this is a similar amount of power from the N54 of 335i/135i fame, but now using the new twin-scroll technology BMW can achieve this power from the use of only one turbo.
This is not simply a more efficient engine, but it achieves the similar amount of power with quicker throttle response and max power lower in the rev range (1200rpm).
What is twin-scroll?
Dual side by side exhaust inlets feed into a single housing in this setup. Because there are now two exhaust inlets being fed into the housing the exhaust channel can be smaller given more precise control of the velocity of air flow.
Valvetronic -- finally
Yes valvetronic is back in BMW engines again, due to technical reasons the engineers weren't able to use valvetronic correctly with the N54 but have finally overcome whatever obstacles were in their way and now it returns to the N55 with direct injection.
This engine is making its debut on the 535i GT but as in BMW fashion will likely filter down the range and take its place in the 135i, 335i, 535i, 735i, etc..
Quote:
BMW’s current N54 series straight-six engine is one of the most praised engines in the industry today, having taken out the coveted International Engine of the Year award last year and appearing in a vast array of BMW models. With the unveiling of the new 5-series GT last week, BMW has announced a new variation of the 3.0L engine which will debut in the crossover at the end of the year.
The N54 features a twin-turbocharging system, as well as direct-fuel injection and BMW’s own Valvetronic technology, and in its most potent configuration develops up to 326hp (243kW) at 5,800rpm and 332lb-ft (450Nm) of torque from as low as 1,500rpm. BMW’s new variation on the engine, labeled the N55, is based on the same basic engine block and valve system but only sports a single turbocharger. It is the world’s first engine to combine turbocharging, direct fuel injection and fully variable Valvetronic valve management developed by BMW.
Peak output is still a healthy 306hp (225kW) at 5,800rpm and 295lb-ft (400Nm) of torque from an even lower 1,200rpm. Furthermore, the new N55 is also said to be more fuel-efficient than the N54 though no independent test results have been produced.
As previously mentioned, the N55 engine will debut in the 535i 5-series GT along with an eight-speed automatic transmission. This model will be able to accelerate from 0-100km/h in around 6.3 seconds and is rated at 26mpg (9L/100km) in fuel economy.
http://www.motorauthority.com/bmw-un...series-gt.html
----------------------------------------------------------------
V8 twinscroll-biturbo:
heres a pic of the v8 twinscroll-twinturbo config:
and cylinder pairing:
more info here: BimmerFile Archive Exclusive: The NEW ///M Motor in Depth
theres gonna be some exciting new stuff coming out in the next 10-12 months...
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