BMW Z4 (E85)

BMW Z4 (E85/E86)
Overview
Manufacturer BMW
Production 2002–2008
Assembly Greer, South Carolina, United States
Designer Anders Warming (roadster: 1999)
Chris Bangle (design director: 1998-2004)
Tomasz Sycha (Coupe, LCI: 2004)
Adrian van Hooydonk (design director: 2004-05)
Body and chassis
Body style 2-door roadster
2-door coupé
Layout FR layout
Powertrain
Engine 2.0 L N46 I4
2.2 - 3.0 L M54 I6
2.5 - 3.0 L N52 I6
3.2 L S54 I6
Dimensions
Wheelbase 2,495 mm (98.2 in)
Length 4,090 mm (161.0 in)
Width 1,780 mm (70.1 in)
Height E85: 1,300 mm (51.2 in)
E86: 1,285 mm (50.6 in)
Chronology
Predecessor BMW Z3
Successor BMW Z4 (E89)
Interior

The BMW E85/E86 is the first generation of BMW Z4 roadsters and coupes, which were produced from 2002 to 2008. The E85/E86 replaced the Z3 and is the third model in the BMW Z Series. Initial models were in the roadster (E85) body style, with the coupe (E86) body style being added in 2006.

As per the Z3, the Z4 was manufactured solely in Greer, South Carolina.

The M model - the Z4M - is powered by the S54 straight-six engine.

Development and launch

The E85 was designed by Danish BMW-designer Anders Warming from mid-1998 to the summer of 1999. The E85 designs were frozen on March 1, 2000.[1] The Z4 was introduced at the Paris Auto Show in 2002,[2] and North American models went on sale in November of the same year (as the 2003 model year). European sales began in March 2003.[3]

Initial models consisted of the roadster body style powered by a 2.5L or 3.0L 6-cylinder engine.

Body styles

Roadster (E85)

The Z4 Roadster was launched in 2002 with the 2.5i and 3.0i six-cylinder models.[4] Transmission choices were a six-speed manual, five-speed automatic and six-speed SMG-II automated manual.[5]

A four-cylinder model, the Z4 2.0i Roadster, was introduced for the European market in May 2005.

The drag coefficient is maximum 0.35.[6]

Coupé (E86)

Z4 Coupé rear

BMW unveiled a concept coupé version of the Z4 at the Frankfurt Motor Show in 2005.[7] The design of the Z4 and Z4 coupé has variously been ascribed to Anders Warming, Chris Bangle, the controversial former BMW Head Designer, and Adrian van Hooydonk, current BMW design chief,[8][9] and BMW designer Tomasz Sycha (Summer 2004 approval, December 2004 design freeze). The company announced in 2005 that the two-door fastback coupé would be available for production including the return of the M Coupé. The production cars were introduced at the New York Auto Show in April 2006 as a 2-door fastback coupé and launched in late May 2006.[10]

Thanks to its hatch design, the Z4 Coupé offers 10.1 cu ft (0.29 m3) of trunk space,[11] compared with 8.5 cu ft (0.24 m3) for the roadster.[12]

The Coupe's fixed roof increases torsional rigidity, resulting in a stiffness of 32,000 N⋅m (24,000 lb⋅ft) per degree of body twist on the coupe (compared to 14,500 N⋅m (10,700 lb⋅ft) per degree on the roadster), which improves turn-in and overall handling response.[13] The roof has a 'double bubble' contour which serves as an aerodynamic aid and offers more headroom than the roadster with top closed. The Coupé has a sleek fastback rear window that slopes down to an integrated spoiler shaped to deliver downforce to the rear axle at speed.

The model range for the Coupe was more limited than the roadster, and consisted the six-cylinder 3.0si and Z4M models.[14][15] Transmission choices were a 6-speed manual and a 6-speed automatic with shift paddles.

Chassis and body

Convertible (pre-facelift)

Compared with its Z3 predecessor, the Z4 is larger and has a stiffer chassis.[16] As per the Z3, the front suspension is a Macpherson strut design. The rear suspension uses a multi-link design, instead of the semi-trailing design used by the Z3. Some reviewers have criticised the ride quality for being too harsh, and observed excessive bump steer from the rear suspension.[17]

The Z4 used lightweight materials to offset the increased weight over the smaller Z3, such as an aluminium hood and suspension components, magnesium roof frame. Run-flat tires removed the need for a spare tire, which reduces weight and allows for a larger trunk.[18]

Equipment

The 6-cylinder engines included all-alloy construction, variable valve timing (double-VANOS) and throttle by wire. Safety technology included four-wheel disc brakes and electronic stability control, incorporating ABS and traction control.

An optional "Sport Package" included added stiffer and lower suspension, 18 inch wheels, and sport tuned electronic steering, throttle and shift parameters ("Dynamic Driving Control").[19]

Electric power steering replaced the traditional hydraulic power steering used by the Z3.[20][21] The power assist is speed-sensitive, allowing for easier manoeuvering at low speeds. The steering has been criticised for lacking feedback.[22] However, the Z4 M uses hydraulic power steering, and has been judged as having a more direct and communicative feel to the steering.[23]

Transmissions

The available transmissions were:

  • 5-speed manual Getrag S5D250G (2.2i, 2.5i)[24]
  • 6-speed manual ZF GS6-17BG (2.0i)[25]
  • 6-speed manual ZF GS6-37BZ (3.0i, Z4M)[26]
  • 5-speed automatic ZF 5HP19 (2.2i, 2.5i, 3.0i)[27]
  • 6-speed automatic ZF 6HP19 (3.0si)[28]
  • 6-speed automated manual SMG-II (2.5i, 3.0i)[29]

Models

ModelYearsEngineDisplacementPower[30]�Torque[30]Curb Weight0-100 km/h (62 mph)time, sec
2.0i*2005–2008N46B20
4-cyl		1,995 cc (122 cu in)110 kW (148 bhp)
@ 6200 rpm		200 N⋅m (148 lb⋅ft)
@ 3600 rpm		2,855 lb (1,295 kg)8.2
2.2i2003–2005M54B22
6-cyl		2,171 cc (132 cu in)130 kW (174 bhp)
@ 6250 rpm		210 N⋅m (155 lb⋅ft)
@ 3500 rpm		2,932 lb (1,330 kg)7.7
2.5i2003–2005M54B25
6-cyl		2,494 cc (152 cu in)141 kW (189 bhp)
@ 6000 rpm		245 N⋅m (181 lb⋅ft)
@ 3500 rpm		2,943 lb (1,335 kg)7.0
2006–2008N52B25
6-cyl		2,497 cc (152 cu in)130 kW (174 bhp)
@ 5800 rpm		230 N⋅m (170 lb⋅ft)
@ 3500 rpm		2,965 lb (1,345 kg)7.0
2.5si2006–2008N52B25
6-cyl		2,497 cc (152 cu in)160 kW (215 bhp)
@ 6500 rpm		250 N⋅m (184 lb⋅ft)
@ 2750 rpm		2,998 lb (1,360 kg)6.5
3.0i2002–2005M54B30
6-cyl		2,979 cc (182 cu in)170 kW (228 bhp)
@ 5900 rpm		300 N⋅m (221 lb⋅ft)
@ 3500 rpm		3,009 lb (1,365 kg)5.9
2006–2008N52B30
6-cyl		2,996 cc (183 cu in)160 kW (215 hp)
@ 6250 rpm		250 N⋅m (184 lb⋅ft)
@ 2750 rpm		3,020 lb (1,370 kg)6.2
3.0si Roadster2006–2008N52B30
6-cyl		2,996 cc (183 cu in)195 kW (261 bhp)
@ 6600 rpm		315 N⋅m (232 lb⋅ft)
@ 2750 rpm		 3,086 lb (1,400 kg) 5.6
3.0si Coupe 3,075 lb (1,395 kg) 5.6
M Roadster 2006–2008S54B32
6-cyl		3,246 cc (198 cu in)252 kW (338 bhp)
@ 7900 rpm		365 N⋅m (269 lb⋅ft)
@ 4900 rpm		 3,197 lb (1,450 kg) 5.0
M Coupe 3,230 lb (1,470 kg) 4.8

* The 2.0i was only sold in Europe.[31]

All models are E85 roadsters except as noted. European specifications shown. North American vehicles have slightly lower power ratings, due to lower compression ratios necessitated by fuel quality issues. US models include 2.5i Roadster, 3.0i Roadster, 3.0si Roadster & Coupé, M Roadster & Coupé.[32]

Z4 M versions

Z4 M Roadster front
Z4 M Roadster rear (non-standard wheels)

The Z4 M Coupe/Roadster was introduced in 2006 and is powered by the S54 straight-six engine from the E46 M3. The S54 was also on the Ward’s 10 Best Engines list for 2001 through 2004.[33] North American Z4 M models produce 330 bhp (246 kW), 3 hp less than the North American M3.[34] In other markets, the power output is the same 252 kW (338 bhp) as the M3.

The Z4 M uses hydraulic power steering, unlike the electric power steering used by the rest of the Z4 range.[34] Other changes include a wider front track, revised front suspension and steering geometry.[34]

The M coupe's production began at the Spartanburg BMW plant in Greer on 4 April 2006.

Special models

Concept Coupé Mille Miglia 2006

Concept Coupé Mille Miglia 2006 at the BMW Museum in Munich

The Concept Coupé Mille Miglia 2006 is a concept car inspired by the BMW 328 Mille Miglia Touring Coupé. It was unveiled at the 2006 Mille Miglia rally in Italy.[35]

Using the Z4 M Coupé's drive components, the concept car is 23 cm (9 in) longer, 14 cm (6 in) wider but 4 cm (2 in) flatter than the Z4 M Coupé. Other features of the concept car include 20-inch alloy wheels with 245/40R20 tires, permanently integrated sidewalls, swing-up cockpit, LED headlight panel, silver-coloured carbon-fibre reinforced plastic body and an interior constructed from stainless steel, untreated cowhides and Lycra fabric.[36]

The vehicle was designed by Anders Warming.[37]

Model year changes

2005

  • Four-cylinder model (2.0i) introduced.

2006 facelift

Convertible (facelift)
Coupe (facelift)

The Z4 facelift (also known as LCI) models were launched at the 2006 North American International Auto Show in Detroit.[38] The major changes were:

  • Coupe models introduced.
  • Introduction of the M Roadster, powered by the S54 straight-six engine (the M Coupe began production a few months later, in April 2006)
  • 2.2i model discontinued.[39]
  • Six-cylinder engines (aside from the M Roadster) upgraded from the M54 to the N52.
  • Revised headlights, front bumper and tail lights.[40]
  • Six-speed automatic transmission becomes available.
  • Six-speed manual transmission becomes standard equipment on all models.

Production

Over the Z4's life cycle, 197,950 vehicles had been produced, with 180,856 roadsters and 17,094 coupés.[41]

The last of the first-generation Z4 (Z4 3.0si Roadster in Space Grey) rolled off the production line on 28 August 2008.[42]

Roadsters

The Z4M Roadster had a total worldwide production of 5,070, including 3,042 cars for the North American market.[43]

Coupes

The worldwide model breakdown for the E86 Coupe over the its life cycle (2006–2008) is 12,819 Z4 3.0si coupés, and 4,275 Z4M coupés.[44][45] Even from its introduction in 2006, the Coupé was relatively rare: In its first 13 months on the market, the roadster outsold it at a ratio of 7 to 1.[46] For the UK 3.0si coupe model, 1598 cars were produced with an manual transmission and 1998 cars with an automatic transmission.[47]

The North American (United States and Canada) production total for coupe models is 3,919, comprising 1,815 M-Coupes[45] and 2,104 were the 3.0si Coupes. Of the 2,104 3.0si Coupes produced for the North American market, 1,276 were automatics and 828 were manual transmission; the Z4M was only available with a manual transmission.[48]

In North America the 3.0si coupe was only available for sale in the United States although a number were imported into Canada from the US.

The yearly breakdown of North American market coupe production totals are as follows:

Year3.0si coupesZ4M Coupes
2006348380
20071,2801,187
2008476248

Motorsport

Endurance racing

Dieter Quester, Dirk Werner, Jamie Campell-Walter and Tim Mullen won the Silverstone Britcar 24-Hour race with a BMW Z4 M Coupé.[49] The unit of the racing version is a modified version of the S54B32 3.2-litre straight-six engine, producing approximately 294 kW (394 bhp). The car is made by BMW's M Division and called the Z4 M Coupé Motorsport.[50]

In the 2008 Super Taikyu Endurance Series in Japan, the Petronas Syntium Team entered two Z4M cars.[51] The cars dominated the series by taking first and second at every race, finishing the Super Taikyu 1 class in first and second place to win both the championship and drivers title. The Petronas Syntium Team earned 277 points, compared to the next placed team on 98 points.[52] The cars were driven by established and popular drivers such as Fariqe Hairuman, Nobuteru Taniguchi, Masataka Yanagida, Manabu Orido and father and son pairing of Hans-Joachim Stuck and Johannes Stuck.[53]

The team of Bas Leinders secured pole position at the 2011 24 Hours of Spa in their Z4.[54] This team did not finish, however the Z4 of Dirk Werner came 2nd in the race.

Super GT

In August 2008, a modified Z4 debuted in Round 6 of the Super GT season,[55] marking BMW's return to the series after the M3 was retired from the JGTC series. It was run by the Studie team and participated in the GT300 class. The car was powered by a detuned version of the S62 V8 engine from the E39 M5. The Z4 competed in the 2009 Super GT season (aside from than Sepang Race),[56] and they would replace their H-pattern to a sequential transmission, as well as their S62 Engine with an S65B40 after race 3, after they had suffered an unrepairable engine blow in race 2 at Suzuka.[57] The car was retired at the end of the 2009 season, with its E89 Z4 GT3 successor making its debut in the 2010 season.[58]

References

  1. ↑ "Design to Reality: the Z4 Roadster". AutoFieldGuide.
  2. ↑ "BMW Z4 - 2002 Paris Motor Show". www.caranddriver.com. Retrieved 7 July 2017.
  3. ↑ Jung, Holger. GWA Effie Jahrbuch 2004 (in German). GWA. p. 21. ISBN 3871508853.
  4. ↑ "2002 BMW Z4 Roadster E85 phase-I full range specs". www.automobile-catalog.com. Retrieved 9 July 2017.
  5. ↑ "Long-Term Test Verdict: 2003 BMW Z4 3.0i". www.motortrend.com. Retrieved 9 July 2017.
  6. ↑ BMW. "BMW Presse - Technische Daten Z4 E85 VFL" (PDF) (in German). Retrieved 2017-08-29. before facelift in 2006.
  7. ↑ "2005 Frankfurt Motor Show Coverage". www.motortrend.com. Retrieved 9 July 2017.
  8. ↑ Vasilash, Gary S. (2002). "Design to Reality: the Z4 roadster". Automotive Design and Production. Retrieved 1 December 2002.
  9. ↑ "An Interview with BMW's chief designer". BusinessWeek. Archived from the original on 16 November 2006. Retrieved 2006-10-16.
  10. ↑ https://www.carsguide.com.au/car-reviews/bmw-z4-coupe-evolved-to-a-revolution-9303
  11. ↑ "2008 BMW Z4 & M Coupe Specs". JB car pages. Retrieved 2008-12-22.
  12. ↑ "2008 BMW Z4 & M Roadster Specs". JB car pages.
  13. ↑ "BMW Z4 & M Coupé". Pistonheads pages. Retrieved 2011-07-27.
  14. ↑ AARON ROBINSON. "2006 BMW Z4 3.0si Coupe". caranddriver.com.
  15. ↑ "Z4 E86 model selection". www.realoem.com. Retrieved 9 July 2017.
  16. ↑ "2003 BMW Z4 first drive". www.roadandtrack.com. Retrieved 7 July 2017.
  17. ↑ "BMW Z4 3.0i - Long term tests". www.evo.co.uk. Archived from the original on 8 July 2013.
  18. ↑ "2003 BMW Z4 - Road test & review". www.automobilemag.com.
  19. ↑ "2003 BMW Z4 3.0i - Long-Term Road Test". www.caranddriver.com. Retrieved 10 July 2017.
  20. ↑ "Z4 E85 Z4 2.5i Steering column/trim/interlock cable". www.realoem.com. Retrieved 10 July 2017.
  21. ↑ "Z3 E36 Z3 3.0i POWER STEERING". www.realoem.com. Retrieved 10 July 2017.
  22. ↑ "Road Test: ...2004 BMW Z4..." Motor Trend. Retrieved 2011-04-22.
  23. ↑ "2007 BMW Z4 M". Edmunds. Retrieved 2011-04-22.
  24. ↑ "Z4 E85 Z4 2.2i Manual gearbox". www.realoem.com. Retrieved 7 July 2017.
  25. ↑ "Z4 E85 Z4 2.0i Manual gearbox". www.realoem.com. Retrieved 7 July 2017.
  26. ↑ "Z4 E85 Z4 M3.2 Manual transmission". www.realoem.com. Retrieved 8 July 2017.
  27. ↑ "E85 transmissions" (PDF). www.unofficialbmw.com. Retrieved 8 July 2017.
  28. ↑ "Z4 E85 Z4 3.0si Automatic gearbox". www.realoem.com. Retrieved 8 July 2017.
  29. ↑ "Z4 E85 Z4 2.5i Manual gearbox GS6S37BZ (SMG)". www.realoem.com. Retrieved 8 July 2017.
  30. 1 2 Power and torque figures may vary slightly between North American and European specification engines.
  31. ↑ "Z4 E85 2.0i model selection". www.realoem.com. Retrieved 15 July 2017.
  32. ↑ "2008 BMW Z4 Review". JB car pages. Retrieved 2008-12-22.
  33. ↑ "Jalopnik: "Dear BMW, Why Did You Retire the S54B32 Engine?"". BMW BLOG.
  34. 1 2 3 "2006 BMW Z4 M Roadster - Road Test". www.caranddriver.com. Retrieved 15 July 2017.
  35. ↑ "BMW Concept Coupe Mille Miglia". www.classicdriver.com. Retrieved 20 July 2017.
  36. ↑ Stuart Waterman (11 May 2006). "BMW unveils stunning Mille Miglia Concept Coupe". Autoblog.
  37. ↑ "BMW Car Designers". bmwism.com.
  38. ↑ "BMW Z4 Roadster gets its 343 hp M version with major updates to the whole Z4 family". www.autopressnews.com. Retrieved 20 July 2017.
  39. ↑ "Z4 E85 2.2i model selection". www.realoem.com. Retrieved 20 July 2017.
  40. ↑ "BMW Z4 Buyers Guide". www.hilmi.eu. Retrieved 20 July 2017.
  41. ↑ "US: BMW ends Z4 production". AutomotiveWorld. Retrieved 2008-09-03.
  42. ↑ Final Z4 roadster rolls out in Greer Archived 24 July 2009 at the Wayback Machine.
  43. ↑ "E85 Z4 M - how many?". www.z4-forum.com. Retrieved 22 July 2017.
  44. ↑ Source – BMW Car magazine, Nov. 2008 issue, pp 9.
  45. 1 2 "z4M-R/C VIN numbers/ Total production". www.bmwcca.org. Retrieved 22 July 2017.
  46. ↑ Kelsey Mays. "2008 BMW Z4". cars.com.
  47. ↑ "Production Numbers - Z4 Coupe". www.z4-forum.com. Retrieved 22 July 2017.
  48. ↑ "Z4C non-M list, production numbers". zpost.com.
  49. ↑ "BMW Z4 M Coupe prevails in Silverstone 24-Hour Race". BMW Motorsport. Archived from the original on 16 October 2007.
  50. ↑ "BMW Z4 M Coupe as Motor Racing Kit". AutoMotoPortal.com.
  51. ↑ "Team Petronas Motorsport website". www.teampetronas.com. Archived from the original on 2 March 2009.
  52. ↑ "Super Taikyu Series 2008 Ranking". Archived from the original on 21 December 2008. Retrieved 6 December 2008.
  53. ↑ "Tokachi 24 Hours Endurance Race". Archived from the original on 16 October 2008. Retrieved 2008-12-06.
  54. ↑ "Qualifying 3". blancpain-endurance-series.com. Stéphane Ratel Organisation. 29 July 2010. Archived from the original on 13 March 2012. Retrieved 2010-07-29.
  55. ↑ "MTSGT2008 - Studie GLAD BMW Z4~Super GT 2008 Memorial". www.youtube.com. Retrieved 25 July 2017.
  56. ↑ "Hatsune Miku BMW Z4 appears at a year-end Itasha event". Super GT. Archived from the original on 26 April 2009.
  57. ↑ "Hatsune Miku Z4's report vol.4". Studie Glad Racing.
  58. ↑ "BMW Z4 GT3 is the V8-powered Z4 M you can race". www.autoblog.com. Retrieved 25 July 2017.
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