Expert dialogue BMW 1 Serial Yard Coupé: BMW M Engineer J. Schwenker answered questions asked by German members of the K Community M Power World. Very interesting and worth a full read.

What special modifications were needed afterward the transplanting of the BMW M3 chassis to the BMW 1 Series?
The kinematics of the chassis, in other words the geometry of the pivot points, link lengths and front and rear axle supports were taken from the BMW M3. The lighter weight means that the front axle support of the BMW i Serial Thousand Coupé does not need a stiffening plate. In terms of vehicle weight and the shorter bike base of operations, the springs and dampers take too been readjusted. Other changes were also made to the auxiliary springs and stabilisers, for instance the stabiliser on the rear axle has reduced torsional rigidity.

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Why is it that the DSC regulator kicks in much more directly in the BMW 1 Series M Coupé, in comparing with the BMW M3 for case?
"DSC on" prevents the back of the vehicle from skidding, while "DSC off" and "MDM manner" are used for targeted drifting.  The aligning we have chosen ensures driving stability and security in critical driving situations, e.yard. high transverse acceleration with vertical excitation or strong acceleration in bends for driving stability and security. The special characteristics of the engine in the BMW i Series Thou Coupé – strong torque and spontaneous response – require that the DSC should appoint at the decisive moment.

Would it not accept been possible to reduce the weight of the BMW 1 Serial M Coupé to closer to 1,400 kilos instead of the 1,570 kilos achieved? Afterward all, a number of body parts had to be redeveloped anyway. What would have been the additional price for the customer if the ane,400 kg target had been reached?

Information technology is unrealistic to expect a weight reduction of 170 kilos on an existing basic vehicle. The M3 CSL and M3 GTS show where the reasonable limits lie. It would exist necessary to develop a completely new auto from scratch – which would, of course, also mean a completely different toll calibration. Nosotros were adamant to offer a existent BMW M that would likewise allow newcomers to take some fun with the strongest letter in the world. That's why nosotros are choosing to get with intelligent lightweight construction methods, due east.yard. light wheels and specific avoidance of insulating mats. The chassis of the BMW 1 Serial Yard Coupé also helps optimise weight. Both the two-joint forepart beam, likewise as the five-link rear axle of the BMW 1 Series M Coupé are made most completely from aluminium. Tubular stabilisers, axle guides made from forged aluminium and aluminium shock absorbers complete the lightweight concept for the wheel suspension. The weight of the BMW 1 Serial M Coupé is precisely the same as that of the previous generation of the BMW M3, with comparable output and much higher torque. The vehicle weighs 1,495kg (DIN kerb weight) (with 90% full fuel tank without driver and luggage); the 1,570 kg specified are the European union standard weight (including 75 kg for driver and luggage).

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Why does the already skilful responsiveness of the engine amend noticeably when the Grand push is pressed?
The M push leads to an emphatically sporty engine command with the focus clearly on the response characteristics of the engine. Comfort-related problems such as smoothen running are dealt with on a secondary footing.

What is the precise difference between the 2 bachelor motor mappings?
On the one hand, the focus of basic coordination lies on unlimited everyday use, while on the other paw, the car's sporty graphic symbol is to be immune to develop. Different motor mappings were implemented in society to achieve these two opposing requirements: from spontaneous and snappy to harmonious, long-haul capabilities. Thus, for example, passengers notice the jerking of the head acquired by the spontaneous response of the engine when accelerating and decelerating to exist quite uncomfortable. The driver registers this less than his passengers. This event is greatly reduced through basic coordination.

What is the output of the engine at the moment of over-boost? Mathematically speaking, the greater the torque the greater the operation.
Over-boost ways a torque of 500 Nm at a respective speed. Nonetheless, the maximum output is not achieved in the over-boost range, but rather at college speeds. Over-boost is axiomatic in the lower to medium speed range.

Would information technology not accept been an "easy" matter to make the engine output of the BMW Chiliad TwinPower turbo a little bit "sharper"…?
Output  ways "torque by engine speed". As the engine speed increases, causing the output to rise, the required speed of the turbocharger would too further increase. However the speed of the chargers cannot be increased indiscriminately if one is also to meet the service life and quality standards applied by BMW. The culling would be to use larger chargers, which again would not be optimal because of the resulting slower response.

Why is the car supplied with standard sports seats when yous order BMW Performance sports seats? Surely the original seats are redundant…
BMW Performance accessories tin be ordered from BMW dealers, who will then install them. These seats cannot be supplied ex-works.

Why non supply the bucket seats and a lighter exhaust pipe as Operation options immediately? Surely that would save 80 to 100 kilos of weight.
Irresolute to bucket seats and a dissimilar exhaust arrangement would not exist enough to reduce the weight past fourscore to 100 kilos.  Seats and exhaust systems designed to reduce weight, as used in motor racing for example, are non suitable for homologation, enabling them to exist used in a standard vehicle. Exhaust systems in standard vehicles must meet sure criteria in relation to racket emissions and service life.  There are also legal requirements for seats and seat positions.

Are there any special points to be noted when running in the turbo-charged engine?
There are no general differences from other BMW M engines. The measures described in the operating instructions are to be followed: changing operating states but no maximum speeds and loads. Respecting these principles will also benefit the gearboxes and rear axle differentials. The clutch should too be used equally gently as possible while running the car in.

Are there rules for running the turbo when cold, or is this an "urban legend"?
This is no urban fable – the turbocharger comes under loftier thermal stress and can become cherry-hot when running nether maximum load. The charger is lubricated and cooled by ways of the engine oil. Cooling is also achieved by ways of the cooling water, so that the pump for this is allowed to continue to run every bit necessary. Even so, the oil can tend to coke in the bearings if the engine is switched off under farthermost conditions. The problem described tin occur after maximum stresses, equally on the racetrack for example. There is no doubt that, afterward a longer period of use at full throttle, information technology would practice no impairment to allow the auto a chance to absurd downwardly under normal weather. The instructions in the operating transmission should be observed.

When would you recommend using the "racing brake linings" available for the vehicle?
These are really only suitable for racetrack utilize: the brake linings characteristic a further increase in the stability of the frictional coefficient under high thermal stress. Even so, this comes at a price in terms of comfort (rubbing/ squeaking) and wear on the restriction discs, and the brakes are practical much more forcefully. Despite these uncompromising characteristics, the brake linings available for the BMW 1 Series Chiliad Coupé are approved for street use.

What is the difference between "DSC on" and "MDM Style"?
The DSC, in other words the regulator, is more often than not activated a petty later in MDM mode. However, the coordination of parameters in MDM has 1 thing in common in all driving situations: the clear focus is on driving dynamics. For example, MDM way allows the wheels to spin when in that location is slip on the rear axle – however simply up to a certain level of yaw rate and acceleration (instability). Only then will the regulator boot in.

Are in that location whatsoever plans to offer other specific accessories for the motorcar, such every bit the BMW M3 GTS spoiler or the adapted splitter from the MotoGP SafetyCar?
The parts from the MotoGP SafetyCar are unique pieces that have not completed the standard evolution process and consequently these are unavailable to customers. BMW M3 GTS parts are also not available for the BMW 1 Series M Coupé because they are only supplied to customers who ain a BMW M3 GTS upon production of the relevant vehicle registration papers.

How long is to the BMW 1 Series M Coupé to be built and is there a limit on numbers?
This is not a limited edition.

Is at that place anything that the BMW one Series M Coupé engineers are particularly proud of?
We are proud of the fact that we have got things so right with this car in such a short space of fourth dimension, producing a pinnacle-form driving experience that is also perfect for everyday use. The BMW 1 Series M Coupé is every flake as sporty as information technology looks.

What was the reason for deciding confronting an adaptive chassis?
The BMW 1 Series Grand Coupé has been designed with absolute consistency: information technology is purist in its form and is tailored to a young target grouping. It has a item body share, engine, manual and bike size.  This made it possible to coordinate all the elements to perfection, and so that there was no need for an adaptive chassis.

Why wasn't the double-clutch manual of the Z4 sDrive 35is adjusted?
The answer is basically the aforementioned as for the previous question. Plus the fact that a manual transmission was perfect for the purist character of this auto.

Why is the BMW 1 Series 1000 Coupé supplied with the Michelin Airplane pilot Sport two ex works instead of the current successor product, the Michelin Airplane pilot Super Sport?
The successor to the excellent PS2 is the PS3. At the time of vehicle testing and homologation, the Michelin Pilot Super Sport was not yet available in this size.

Does the exhaust system use valve engineering?
No at that place is no valve engineering science used in the exhaust organization.

is in that location a plan to provide an M Driver's Parcel that extends maximum speed to 275 km/h, for example?
In that location are no such plans.

Would it exist possible to produce a BMW 1 Series Grand Cabriolet?
It would indeed be possible, only no such plans exist at nowadays.

[Source: M-Power ]