Home Forums Articles How To's FAQ Register
Go Back   Xoutpost.com > BMW SAV Forums > X ///M Forum
User Name
Member List Premier Membership Search Today's Posts Mark Forums Read

Xoutpost server transfer and maintenance is occurring....
Xoutpost is currently undergoing a planned server migration.... stay tuned for new developments.... sincerely, the management

LinkBack Thread Tools Display Modes
Old 07-30-2010, 10:12 AM
Join Date: May 2005
Location: South Florida
Posts: 328
TahoeM3 is on a distinguished road
Engine difference b/w X5M and 50i?

I'm sure this has been discussed before...I did a search but didn't see it.

What exactly are the differences between the engine in the X5M and the 50i? Both are 4.4 twin turbo, so does it have bigger turbos? More aggressive tuning? Or are the engine internals different?

2017 Nissan GTR Red/black - Tune/midpipe
2013 BMW X5 50i M-sport Alpine white/black - Dinan stage 1
2016 Jaguar F-Type R Gray/red
Reply With Quote

Sponsored Links

Old 07-30-2010, 12:54 PM
StanF18's Avatar
Join Date: Nov 2007
Location: northern NJ
Posts: 994
StanF18 is on a distinguished road
All of the above, except the turbo size.
Larger and wider bore, more turbo boost pressure, uses Cylinder-bank Comprehensive Manifold (CCM), which is BMW's way of describing the precise geometrical alignment of the cylinders to the exhaust manifold. Goal being to shorten the intake exhaust paths and minimize pressure loss even more than already done in the stock 50i engine. I would bet that the engine management software is also configured more aggressively.

But yes, it seems to me that the similarities outweigh the differences. I would guess that the 50i engine is sufficiently DE-tuned in stock form that you can safely and easily squeeze another 80-100hp just with a good reprogramming. Dinan and other shops have already done this with the 3-series 6-cylinder turbo to get the 335i even with the stock M3 in terms of performance.
Reply With Quote
Old 07-30-2010, 12:58 PM
JCL's Avatar
JCL JCL is offline
Premier Member
Join Date: Mar 2005
Location: Vancouver, Canada
Posts: 11,853
JCL will become famous soon enoughJCL will become famous soon enough
Different turbos on the X5M (twin scroll), with different manifolds.
2007 X3 3.0si, 6 MT, Premium, White

2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver

2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
Reply With Quote
Old 07-30-2010, 02:18 PM
Join Date: May 2005
Location: South Florida
Posts: 328
TahoeM3 is on a distinguished road
Awesome, thanks. Ultimately I see myself getting the 50i and hopefully adding 100 hp or so through ecu and exhaust mods.
2017 Nissan GTR Red/black - Tune/midpipe
2013 BMW X5 50i M-sport Alpine white/black - Dinan stage 1
2016 Jaguar F-Type R Gray/red
Reply With Quote
Old 07-30-2010, 09:07 PM
LeMansX5's Avatar
Join Date: Mar 2005
Location: X5world
Posts: 20,267
LeMansX5 has a spectacular aura aboutLeMansX5 has a spectacular aura aboutLeMansX5 has a spectacular aura about
X5 ///M S63 engine

S63 Engine

There is a twin scroll twin turbo version of the N63, known as the S63, with Cylinder-bank Comprehensive Manifold (CCM). Engine is rated 555 PS (408 kW; 547 hp) at 6000 rpm and 680 N·m (500 lb·ft) at 1500-5650 rpm. It currently powers the X5 M and X6 M, the high performance derivatives of BMW's Sports Activity Series crossovers.

Using BMW's innovative "M Twin Power Turbo" engine with high precision Direct Injection and twin turbochargers as a basis, the new M engine introduces twin-scroll twin turbochargers and patented exhaust manifold technologies to achieve outstanding thrust and pulling force, while preserving the most compact dimensions possible. Two low-mass twin-scroll turbochargers are positioned together with the catalytic converters in the “V” section between the two banks of cylinders. By reversing the flow of gases through the engine from traditional arrangements, the intake and exhaust ducts are shortened and widened. The result is that pressure losses on the exhaust side are minimized. The goals: virtually eliminate turbocharger lag while maximizing combustion efficiency and power output. Tremendous power and performance are delivered by the engine in the BMW X5 M and BMW X6 M through a new reverse flow design and construction principle.[4]

The new M V8 engine with twin-scroll twin turbo technology uses a single exhaust manifold with tuned-length runners, incorporating both cylinder banks and connecting cylinders in carefully selected pairs. This configuration, patented by BMW M and known as Cylinder-bank Comprehensive Manifold () (check this in Product Library), offers lightning-quick response, a linear build-up of engine power, and a broad, consistent torque curve by feeding each of the twin turbochargers with a “charge pulse” at approximately every 90 degrees of crankshaft rotation, rather than the more traditional “irregular schedule” of charging.[5]

The managed flow of exhaust gas provided by the Cylinder bank Comprehensive Manifold ensures high-velocity flow of combustion gases. The appropriate separation of exhaust gas flow from different cylinders is maintained until the gas reaches the turbine wheel, spooling the two twin-scroll turbochargers without back-pressure. With maximum boost pressure), the use of twin-scroll twin turbo technology and the patented exhaust manifold allows complete exploitation of the benefits of turbocharging

The M TwinPower Turbo: Twin Scroll Twin Turbo Technology with a joint exhaust manifold for both rows of cylinders making its debut in the market.
Power and performance typical of BMW M is delivered by the power unit in both the BMW X5 M and the BMW X6 M by a new design and construction principle: The new M TwinPower Turbo with Twin Scroll Twin Turbo Technology and the exhaust manifold extending over both rows of cylinders patented by BMW offer absolutely extreme response and spontaneity, a linear build-up of engine power, and an unusually consistent torque curve.
The two turbochargers are positioned together with the catalytic converters in the V-section between the two rows of cylinders. The position of the intake and exhaust ducts provided in this way serves to reduce the length of the pipes and manifolds and increase their cross-section, with pressure losses on the exhaust side being significantly minimised in the process.
The joint flow of exhaust gas provided by the common manifold system connecting two cylinders at a time also ensures optimum gas throughput. The separation of exhaust flow is continued until the exhaust gas reaches the turbine wheel, building up ongoing pressure on the two Twin Scroll Turbochargers not impaired by any kind of counter-pressure.
With maximum charge pressure amounting to 1.5 bar, the use of Twin Scroll Twin Turbo Technology with its inter-cylinder exhaust manifold makes unique use of the turbocharging potential.

Immediate, direct response to the gas pedal and truly exceptional pulling force from the engine starting at low speeds and continuing consistently to the highest load level characterise the new M TwinPower Turbo from BMW M GmbH. The truly impressive development of power ensured in this way is accompanied by fascinating engine sound accentuating the fast-revving engine characteristics and the linear build-up of power by a supreme acoustic effect typical of a BMW M Car.

Reflecting the superior power of the engine, the V8 power unit comes with a cooling system developed specifically for the two new models. One special feature in this context is the indirect intercooling effect serving to optimise performance under particularly dynamic driving conditions.
The new M TwinPower Turbo develops its outstanding output and performance with equally outstanding efficiency. In addition to direct ¬High Precision Injection, both the BMW X5 M and the BMW X6 M are equipped with a wide range of technologies from BMW ¬EfficientDynamics. Apart from Brake Energy Regeneration, these also include on-demand control of the electrical fuel pump, a detectable a/c compressor, as well as a volume flow-controlled supply of hydraulic fluid to the anti-roll system also operating specifically on demand.

Both models offer average fuel consumption in the EU test cycle of 13.9 litres/ 100 kilometres, equal to 20.3 mpg imp. Their CO2 rating is 325 grams per kilometre. And last but not least, the engine naturally fulfils all the requirements of the US LEV II standard as well as the EU5 requirements in Europe.

X5 xDrive50i - N63B44 engine

N63B44 features a reverse-flow air design in which the turbochargers are mounted in the engine valley and the intake manifolds are located on the sides of the block. This new design creates a more compact engine package and reduces the width of the assembled engine. The engine uses air-to-water intercoolers, which is more efficient and provides a shorter air path than using a standard air-to-air intercooler. [1]

Similar to the N54B30, the N63B44 does not use the second generation Valvetronic technology found in other current engines. The principal advantage of Valvetronic is the reduction of intake vacuum, which is not an issue in the pressurized intake found in a turbo-charged engine.

In terms of performance, the N63 is a close match to the N73 V12 engine found in the previous-generation E65 760i/Li, so the BMW N74 V12 engine had to be redesigned for the F01 760i/Li in order to maintain its status as the flagship of the range.[3]

A class of its own: the new 8-cylinder engine with Twin Turbo technology.
Supremacy as the most important feature – this applies both to the BMW X models and to its 8-cylinder power units. And now the BMW X6 is adding an incomparably dynamic variant to the line-up of BMW x models, with the world’s first Sports Activity Coupé for the first time boasting a particularly sporting and dynamic 8-cylinder. Displacing 4.4 litres, the new V8 power unit with Twin Turbo technology and direct petrol injection (High Precision Injection) develops maximum output of 300 kW/407 bhp across a broad range of engine speed from 5,500–6,400 rpm. Engine torque reaches its peak of 600 Newton-metres/ 442 lb-ft across an unusually large speed range from 1,750–4,500 rpm. The spontaneous, intense and long-lasting thrust generated in this way is the result of Twin Turbo technology already featured on BMW’s most powerful in-line 6-cylinder engine combined with High Precision Injection. In the new V8 the cooling effect of direct fuel injection also ensures a compression ratio which is quite unusual for a turbocharged power unit, helping to give the engine an even higher level of all-round efficiency.

The arrangement of the turbochargers and catalytic converters in the V-section between the two rows of cylinders is likewise an innovation in technology, allowing particularly compact engine dimensions and at the same time requiring new configuration of the intake and exhaust ducts. This means shorter intake and exhaust manifolds and larger cross-sections, thereby significantly reducing pressure losses on both the intake and exhaust side.
The all-aluminium V8 power unit developed for the BMW X6 offers all the qualities typical of an 8-cylinder in incomparably sporty style. In practice this means a combination of superior torque at low engine speeds with an ongoing surge of power and performance up to the higher speed range. The BMW X6 xDrive50i accelerates from 0–100 km/h in just 5.4 seconds and boasts ample power reserves for fascinating acceleration also at higher speeds. Top speed is a truly impressive 250 km/h or 155 mph, limited electronically by the engine control unit.

Twin Turbo technology featured for the first time in an 8-cylinder petrol engine.

The power and performance characteristics of the new V8 derive to a large extent from Twin Turbo technology, the use of two turbochargers for the first time in an 8-cylinder power unit serving to boost both engine output and torque with maximum efficiency. Each of the two turbochargers supplies compressed air to four cylinders at a time, ensuring particular spontaneity and a direct reaction to the accelerator pedal. As with the in-line 6-cylinder engine featuring Twin Turbo technology, the turbo lag typical of a turbocharged engine with conventional technology – i.e. the time lag until the turbocharger builds up its power and boost – is virtually eliminated by this superior technology. A further advantage is that the engine revs up smoothly and full of power, maintaining its high torque consistently across an unusually broad range of engine speed. In its power and performance characteristics, therefore, the engine is comparable to a significantly larger naturally aspirated power unit while offering the advantage of much lower weight also thanks to its all-aluminium crankcase.

Not only the dimensions and weight of the new V8 are unusually modest, the fuel consumption is also exceptionally low for an engine of this calibre.
A significant factor contributing to the superior fuel economy is double VANOS continuously variable camshaft management, a technology characteristic of BMW power units. This technology is in fact one of the reasons why the V8 already develops exceptionally high torque from low engine speeds. High Precision Injection also plays a key role in the efficient use of fuel. This second generation of direct petrol injection uses piezo injectors positioned directly next to the spark plugs in the cylinder head and delivering fuel into the combustion chambers at a pressure of 200 bar. The advantage is extremely precise dosage of fuel, with the further benefit of reduced emissions and improved engine acoustics. The engine fulfils both the US ULEV II emissions standard as well as the EU5 requirements in Europe.

The new V8 power unit is the most efficient engine in its class. Combined with a number of further technologies developed in the overall context of BMW EfficientDynamics, the engine gives the BMW X6 xDrive50i fuel consumption and emission figures which are significantly better than other 8-cylinder vehicles competing with the BMW x models. Average fuel consumption of the BMW X6 xDrive50i is 12.5 litres/100 km (equal to 22.6 mpg imp), the CO2 rating is 299 grams per kilometre.
Attached Images

Last edited by LeMansX5; 07-30-2010 at 11:52 PM.
Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 06:07 AM.
vBulletin, Copyright 2021, Jelsoft Enterprises Ltd. SEO by vBSEO 3.6.0
© 2017 Xoutpost.com. All rights reserved. Xoutpost.com is a private enthusiast site not associated with BMW AG.
The BMW name, marks, M stripe logo, and Roundel logo as well as X3, X5 and X6 designations used in the pages of this Web Site are the property of BMW AG.
This web site is not sponsored or affiliated in any way with BMW AG or any of its subsidiaries.