Z4 vs Supra: Co-Developed, Starkly Different - Supra FT1 Forum
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Z4 vs Supra: Co-Developed, Starkly Different


Now that BMW has released all the details and specifications we need on the 2019 Z4, even launching a configurator, it creates a unique opportunity to gain insight on what to expect from the MKV Supra it shares a platform with. Especially as the Supra reveal is right around the corner. BMW and Toyota has committed to making these two very different cars (unlike the BRZ and FRS deal), even though they share a chassis and powertrains. Tada-san put it best, "Toyota wanted to make a pure sports car, and BMW has a slightly different direction”. So far its been reported that an electro-mechanical locking differential among many others are what they'll share. Being an essential part to differentiate their characteristics, expected to leave the Supra not intuitive like the Z4, but as well connected and responsive as any pure sports car should be.

The Adaptive M Sport suspension, M Sport brakes and M Sport differential, standard on the all-new BMW Z4 M40i Roadster and optional on the Z4 sDrive30i, raise the car’s already impressive handling bar to even greater heights. With these chassis systems on board, the differences in the car’s responses between the COMFORT, SPORT and SPORT+ modes, selected with the Driving Experience Control switch, are particularly noticeable. Featuring a 10 mm lower ride height, the Adaptive M Sport suspension includes electronically controlled dampers, which offer both comfortable and more aggressive ride and handling dynamics. The electronically controlled M Sport rear differential gives the handling of the new BMW Z4 an even sharper sporting edge. An electric motor generates a locking effect in the differential that equalizes torque distribution between the inside and outside rear wheels when cornering, making it possible to power out of bends with greater momentum. The active differential lock also works effectively in reducing both understeer and oversteer.

The standard 18-inch light-alloy wheels and optional 19-inch items are all shod with mixed-size tires. The wider rear tires’ increased potential for directional control was factored into the chassis tuning for all variants of the all-new Z4 Roadster.

The new BMW Z4 Roadster isn’t just about classical roadster proportions and spirited driving – it is imbued with state-of-the-art features to pamper both driver and passenger alike. The options list contains a myriad of ways to customize the all-new BMW Z4 Roadster to suit the owner’s personal style.

The array of cutting-edge driver assistance systems available for the Z4 Roadster is unrivalled in this segment. They are designed to optimize specific aspects of comfort and safety and relieve the strain on the driver during both long-distance journeys and in city traffic. The list of options includes Active Cruise Control with Stop & Go function, the Lane Change and Lane Departure Warning systems, as well as a Parking Assistant including Back-Up Assistant. The new BMW Z4 is also the first Roadster to be made available with an optional BMW Head-Up Display.
Source: BMW USA


Like many shared components with the Supra and Z4, the chassis will be tuned differently even right down to software, all this to deliver on the Supra's pure sports car experience. Key points reported to take away are its center of gravity that sits lower than the Toyota 86, rigidity that rivals the legendary LFA and 17 to 19 inch wheels with 255 to 275 wide tires will keep help keep the Supra planted. When questioned by publications on ways to variate the Supra, apparently anything reasonable that consumers want, Toyota might offer. One of those being bigger wheel/tire options depending on demand.

The chassis technology in the new BMW Z4 Roadster has been developed to deliver the best possible agility and handling dynamics, thanks to a newly designed double-joint spring strut suspension at the front and a new five-link suspension in the rear, a first for a BMW Roadster. This chassis combination offers the best balance between sports car handling and ride comfort. The front suspension sub frame and control arm mounting points are extremely rigid, which lends to precise cornering characteristics as well as having a beneficial effect on the drivetrain’s acoustics. The sports car tuning of the front suspension dynamics aids the new Z4 Roadster’s steering precision. Aluminum control arms and swivel bearings reduce unsprung weight resulting in superior agility and efficiency. The new rear suspension also employs a lightweight aluminum/steel design. The large supporting base and very rigid structure of the rear axle subframe as well as the bracing used for connecting it to the body result in extremely precise wheel guidance.

Another standard feature is the sport steering with variable power assist and ratio. This particular version of the power steering system is designed to promote not just straight-line stability in the new BMW Z4 Roadster, but also provide precise feedback during cornering and effortless low-speed maneuvering.

The car’s impressively sporty handling characteristics are aided by powerful lightweight braking and Dynamic Stability Control (DSC) systems, whose wealth of features includes the Anti-lock Braking System (ABS), Dynamic Traction Control (DTC), Cornering Brake Control (CBC), and Dynamic Brake Control (DBC). The standard Performance Control function gives the new BMW Z4 Roadster even nimbler handling by varying the distribution of drive torque to the rear wheels according to the situation at hand.
Source: BMW USA


BMW sourced engines will be found in the all-new Supra, a downside to some Toyota purists, but plays into what we loved about past Supra generations. BMW’s B58, a twin-scroll 3.0-liter engine already found in a number of BMW products should deliver no less than 360 hp in the Supra. Combined with its curb weight of under 3,300 LBS and 50/50 weight distribution its easy to see how the classic formula lives on. First drives of the "90-95 percent finished" Supra prototype suggests it feels fun and fast which makes up for its unengaged feeling in other areas when track tested.

Z4 sDrive30i: More power from the new four-cylinder engine.

To complement the new chassis’ increased capabilities, the new BMW Z4 Roadster arrives in 2019 first with a new, more powerful 2.0 liter four-cylinder TwinPower Turbocharged motor featuring an increase of 15 hp and an impressive 35 lb-ft of torque over its predecessor. The updated BMW engine package include a High Precision Injection system whose maximum pressure has been increased to 350 bar / 5,076 psi. The TwinScroll turbocharged engine under the hood of the new BMW Z4 sDrive30i delivers an output of 255 hp between 5,000 and 6,500 rpm, with peak torque of 295 lb-ft. available from 1,550 up to 4,400 rpm. The result is a 0 to 100 km/h sprint time of 5.3 seconds.

Z4 M40i: BMW M Performance model with straight-six engine.

For those seeking even more exhilarating performance, the all-new 2020 BMW Z4 M40i Roadster’s 3.0-liter six-cylinder in-line engine delivers instantaneous response, an appetite for revs and smoothness while offering an increase of 47 hp over its predecessor. The new 6-cylinder engine’s standout features include a water-cooled exhaust manifold integrated into the cylinder head, quicker TwinScroll turbocharger response and direct injection technology which now works at increased maximum pressure of 350 bar / 5,076 psi. Drivers have 382 hp at their disposal between 5,000 and 6,500 rpm, plus 369 lb-ft. of peak torque from 1,600 to 4,500 rpm. The BMW Z4 M40i Roadster sprints from 0 to 100 km/h in just 4.5 seconds.

Eight-speed Steptronic Sport transmission
Both models of the new BMW Z4 Roadster, sDrive30i and M40i, come equipped with a standard eight-speed Steptronic Sport transmission with shift paddles on the steering wheel. Besides a wider ratio spread, the latest version of the automatic transmission offers even sportier gear shifts. The shorter ratios for the transmission’s lower gears improve acceleration and the unit’s improved internals allow it to operate more efficiently. The transmission features Launch Control for accelerating hard from a standing start with maximum traction. The eight-speed Steptronic Sport transmission fitted in the BMW Z4 M40i has been configured with M-specific shift characteristics to complement the straight-six engine’s power delivery.
Source: BMW USA


The most distinctive of both models are clearly design related. One is a Coupe, the other a Roadster. BMW coming from consistent production of the Z4 with few gap years like Toyota, design followed other new and refreshed BMW products showcasing a new design direction. In the Supra's case, paying homage to a number of products (2000GT, all Supra generations, etc.) while staying relevant in the decade ahead results in the production ready prototype we see today. Unfortunately front and rear ends have little resemblance to the MKIV Supra but its side profile will win over Toyota purists. A recent parts guide leak confirmed what spy shots have been showing.

A number of signature details form the defining features of the all-new BMW Z4 Roadster. The combination of very notable lines and a clean-cut surface design create a very distinctive take on sporting roadster. A sculpted front end with large air intakes, a low, broad BMW kidney grill and headlights positioned at the outer edges showcase BMW’s new design direction. The new mesh-design BMW kidney grill combines a track-inspired honeycomb pattern with a three-dimensional structure, whose elements have a vertical arrangement reminiscent of traditional BMW kidney grill bars. The design of the headlight units are a first for the brand, with the two light sources positioned one above the other. The vertical design is cut off at the top by a diagonal accent strip with integral direction indicator. The new BMW Z4 Roadster is equipped with LED headlights as standard and Adaptive LED headlights available as an option.

The long hood with arrow-shaped contour lines directed at the kidney grill straddles the wheel arches in a “clamshell” style characteristic of classical sports cars of the past. An upper character line runs from the bottom of the hood to the tail lights. A second, lower character line emerges from the large air vents behind the front wheel arches. This interplay of surfaces mimics the flow of air sweeping along the new Z4.

The trunk lid’s integrated spoiler and the slender, horizontally arranged light assemblies in the BMW brand’s customary L-shape help to give the tail of the new BMW Z4 Roadster a wide, road-hugging appearance. The rear end’s powerful look is strengthened by the side surrounds and the trapezoidal exhaust tailpipes flanking the eye-catching diffuser.
Source: BMW USA


Also confirmed with the recent parts guide leak is the interior that shares a lot of design cues with its BMW counterparts. Unfortunately its not nearly driver focused as the MKIV or MKIII, instead similar to the new Z4. Fortunately its one of the only areas that aren't entirely unique to the MKV Supra but likely to change as we move up trim level, especially into higher tier GR versions reported to come. Overall, its a clear winner even with limited information from Toyota currently, but that will change next month at 2019 North American International Auto Show.

The driver-focused cockpit design and clear arrangement of the controls help drivers of the all-new BMW Z4 Roadster concentrate on the main job at hand; enjoying the journey. The engine Start/Stop button has been incorporated into the control panel on the center console, whose styled surface is also home to the gear selector, the iDrive Controller, the Driving Experience Control switch, as well as the Electric Parking Brake and the switch for the electrically operated soft-top roof. The optional two-zone automatic climate control allows the temperature and ventilation settings to be adjusted separately for the driver and passenger side. Automatically dimming and folding exterior mirrors are available, as is Comfort Access. With this feature fitted, the soft-top can be operated using the car key.
The new BMW Z4 comes standard with electric sports seats featuring integral head rests. The seat rails have been extended in length by 23 mm over those in the predecessor model, allowing the seats to be adjusted over a greater range. The optional M sports seats include electro-pneumatic backrest width adjustment to optimize lateral support through high-speed corners.

The practicality of the new BMW Z4 Roadster has been increased by a storage space behind the seats with a retaining net, large cupholders under the center armrest cover (which folds open in two sections) and roomy door pockets. The trunk capacity is 281 litres (with the soft-top open or closed), an increase of more than 50 percent compared to the previous Z4. An optional trunk through-loading system extends the possibilities for handling longer items during everyday use and when going away on trips.
To maximize the capabilities of the large 12.3” digital instrument cluster, the traditional circular gauges have been finessed into an all-new design pushing the speedometer and tachometer gauges to the outer edges of the display as geometric bands. This new design opens space in the middle for routing and navigation, if desired. Information from the center display can also be shown within the tachometer. Additionally, the chosen driving mode will determine the visual display style.
Source: BMW USA

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Last edited by toyotaft1admin; 12-07-2018 at 01:53 PM.
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post #2 of 2 Old 12-10-2018, 03:19 AM
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All this talk about what regular versions will be like is fine and all but to make the original Supra crowd happy, GR versions will have to be intense, just may not as much as GT-R's.
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