Tēma: Rīkošanās ar M3 E36 SMG?

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2007-04-07 20:17, Pastnieks rakstīja:
Nahrenizējot viņu.
Auto kļūs par 50% baudāmāks. ))

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2007-04-07 20:35, stanley rakstīja:
SMG shema

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2007-05-26 10:47, Marchello rakstīja:

2007-04-07 20:15, BiG_BoY rakstīja:
Esmu iegaadaajies M3 E36 ar SMG!Esmu dazhus pekstinus pats atkodis, bet veel iisti neesmu atkodis vinu liidz galam !Mosh kaads var pastaastiit kaa jaariikojaas?

te ir vispaareejs SMG aprakts un dazhas noderiigas fiichas:

The workings of the Sequential "M "Gearbox
The SMG transmission is the standard Getrag six-speed gearbox plus electro-hydraulic clutch action.
It’s operation is controlled by hydraulics & solenoid valves. The system operates under huge pressure (up to 85 bar), which allows quick gearchanges. As each gear is selected a solenoid opens allowing hydraulic fluid into the clutch master cylinder disengaging the clutch. Three hydraulic cylinders activated by solenoids in the shift actuator carry out the gearchange by positioning the main selector shaft in the appropriate slot. In the E36 the gearlever is in the usual location. To upshift pull the lever back once for each gear. To downshift push it forwards. A digital indicator in the bottom of the Rev Counter shows which gear is selected

The E36 SMG also has fully automatic modes... Normal, Sport & Winter. To engage the automatic modes slide the gearlever to the right across the gate. Repeatedly pressing the SMG button on the dash cycles the automatic mode from Normal to Sport to Winter then back to Normal & so on. The Gearlever, SMG button & Selector Lever Position indicator are visible in the photo above. The photo below shows the E36 M3 SMG transmission. The components in the foreground occupy the space in the engine bay usually taken by the windscreen washer fluid reservoir.(See below).

Question: When is an automatic not an automatic?
Answer: when it’s an SMG. And what, pray tell, is SMG? It’s a new gearchange system available as a $4,700 option on BMW M3s.

Apart from submachine gun, SMG stands for Sequential M Gearbox. The ‘M’ is for Motorsport, the BMW subsidiary which, in close cooperation with Getrag and Fichtel and Sachs, designed and developed the system.

And what’s special about it? Well, under the carpet there’s a six-speed manual gearbox very much like that on current M3s, but rather than the conventional H pattern, the SMG gearstick, in Sport mode, moves backwards for upchanges and forwards for downchanges. Unlike the Audi/Porsche Tiptronic system and BMW’s own Steptronic auto, this method feels much more natural.

There’s also a self-select, or E, mode when the manual gearbox changes gear automatically. There are only two pedals, brake and throttle. Operation of the twin-plate dry clutch is automatic.

In practice you select ‘E’ (for easy, efficiency, economy, whatever) and first gear is automatically engaged. But the car doesn’t then creep forward like an ordinary auto; it only moves away when throttle is applied. From there it changes up and down through the box automatically, taking into account your speed and driving style.

If you wish to change up earlier than the computer has calculated (the most powerful in any passenger car, capable of processing 20 million instructions per second) the SMG can be coaxed into doing so by lightly lifting off the throttle. If you need to overtake while in ‘E’ mode there’s a kickdown. And like the auto ’boxes on many modern executive/luxury cars, there’s also a ‘winter’ mode which starts off in second and changes gears more delicately.
But what benefits does the SMG manual provide over a conventional auto? Answer: A lot. As manual ’boxes do, it absorbs less horsepower, provides better fuel efficiency, is lighter, less bulky, less complex and cheaper.

Plus, with the SMG in ‘manual’ mode you can’t select the wrong gear. Move the lever and the hydraulic shifting mechanism always gets it right. It won’t graunch the gears either, and because each shift is perfect there’s less wear and tear on the mechanicals. If you want to change either up or down more than one gear, say from sixth to second, simply move the lever forwards four times as fast as you like – it’s spring-loaded and returns to centre with every change. But here’s the really clever bit; if you’ve misjudged it by downchanging so there’s a risk of over-revving the engine when the clutch re-engages, the system will recognise the error and only drop to the gear the rev limit will allow.
But it doesn’t stop there. If the sensors detect a loss of traction, by downchanging to too low a gear for your speed or lifting off the accelerator while cornering on the limit, the clutch automatically disengages, preventing the rear wheels from ‘dragging’ which can provoke a hard-to-control tailslide. But if you keep the power on and get oversteer, you’re on your own. Like a normal M3, there’s no traction control. There’s more. In ‘manual’ mode, at speeds below 20kmh, SMG will automatically select second and ultimately first if you’ve forgotten to do it.

Question: What about really quick getaways or racing starts?
If there’s no clutch pedal, then how can the clutch be dropped at high enough revs to scorch from 0-100 in 5.5 seconds – the same as the manual M3? Simple; just select first, hold the lever forward, build the revs to 4,000 and the SMG automatically ‘drops’ the clutch. Be ready for the orange ‘change up’ light in the main instrument binnacle, (in ‘S’ mode it won’t change up automatically) then, while holding full throttle, hit second and you’re pretty much there. Brilliant.


But what about blipping the throttle on downchanges for a smoother change – surely you can’t do that? Yes you can. The SMG blips the throttle for you, ensuring a fluid downchange.

And, in case the SMG owner suffers from brain fade there’s a host of idiot-proof safety systems. For example, if a driver leaves it in first with the engine running and then gets out of the car, SMG will automatically select neutral after four seconds. Or if there’s someone in the driver’s seat, the engine’s running, it’s in first and the bonnet’s open, SMG will select neutral so that the car can’t drive off while somebody’s poking around the engine bay…

But the real fun is in the driving. Imagine this; you’re approaching the infamous Paddock Hill bend at Brands Hatch at well over 200kmh in fourth. All you have to do is brake, flick the gear lever forward, ease off the brakes, turn in, power down the hill and then nudge the lever back again for fourth. Because you don’t even have to think about heel and toeing, matching revs and finding the right gear, every driver is going to be smoother, quicker and easier on the transmission. That’s why similar sequential systems are prevalent in F1, Touring Cars, World Rally Cars and GT1 sports car racing.
So are there any downsides?
Not to my knowledge, although anyone expecting the almost imperceptible changes of a modern automatic gearbox like the Steptronic will probably find the SMG a little jerky.

Like any manual, you can really feel the changing process but, also in common with a manual, there are techniques which you probably won’t master after a ten-minute test drive. A few hours is useful – that’s what I had and I sometimes felt a short delay between hitting the lever and the change actually taking place. But my BMW instructor reckoned you need about a week with SMG before everything really falls into place.

It’s been available for a while in some left-hand-drive markets and up till now 53 per cent of M3 customers have taken the SMG option.

BMW GB expect a similar demand over here, but I reckon that figure should by rights be more like 93 per cent in the UK, leaving the remaining seven per cent of manuals for technophobic purists. So long as you don’t mistake it for an automatic, go for it – it really is that good

The SMG Gearbox has 4 modes
1 Sequential Mode and 3 Economy or Semi Auto Modes.

The Sequential Mode is the full user interaction where the driver changes gears by depressing the gear lever back to change up and forward to change down (reverse to the tiptronic/steptronic versions in the automatic cars)

The Economy Mode is the closest the M3 gets to be an automatic.
There are three settings in this mode:
Economy
Sport
Winter

The Economy setting is a fuel-efficient auto drive approach where the gears are changed automatically around the 3500 RPM mark.
The Sport setting is a sharper auto drive approach where the gears are changed automatically around the 4500-5000 RPM mark.
The Winter setting is an auto drive approach where the gears are changed automatically around the 3500 RPM mark but the car starts in 2nd gear to compensate for icy conditions.

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