Showing posts with label quick shift. Show all posts
Showing posts with label quick shift. Show all posts

20 Apr 2014

A few days on with Gear Shift Assist Pro on the BMW R1200GS


If you’re one of the 350 people over the past few days who read my first look about BMW’s new Gear Shift Assist Pro (GSAP) on the R1200GS, you’ll already know I’m quite ecstatic about this system.

Yesterday I covered about 250 miles around South East England including about 10 miles of byways with my cousin Carol who made an unexpected arrival from abroad earlier in the week. Respect to her for tolerating such a long ride the very first time she’s ever been on a motorbike!

Carol on a byway after 6 hours on the bike—still in good spirits!

Carol at Bookham Wood (unaltered photo—it really was that vibrant!)

The GSAP system is great on the open road, particularly for thrusting out of roundabouts onto 60–70mph stretches of road, but also when approaching and following through bends. It’s so quick and effortless—throttle off approaching a bend, kick it down a few gears, throttle on through the corner and back up to speed in one seamless motion.

It does take some mental reprogramming at times, for example when powering up a slip road onto a motorway, because you have to tell yourself not to back off the throttle when changing up a gear. Doing so, even a little bit, results in some unpleasant driveline shock. Full power, half power, even a quarter power it will change as smooth as anything, as long as you maintain the throttle position. It goes against everything you learned during motorcycle training.

The system even works unexpectedly well in Enduro mode on dirt/gravel byways because it engages the next higher or lower gear so smoothly. Something with which to experiment next time I’m on the byways without carrying another soul on the back!

Today the weather took a turn for the worst with grey skies and constant showers—not the best conditions for taking video—but I managed to get out and record a few clips.

Firstly, the GSAP unit which replaces the rod connecting the shift lever to the transmission (the unit is so shiny and new compared to my rather dirty bike):



And now the system in action:



Why do I think this system is a big deal? 


It is deceptively simple and the unit weighs next to nothing, while still retaining the ‘whole experience’ of riding a motorbike whenever desired, with a regular manual transmission and clutch lever. Quick shifters have been around for years, but GSAP is the first time such a system includes downshifts. The complexity is hidden away in the software which makes everything work, but the unit itself is not much more than a sensor to tell the computer what you’re doing with the gear lever.

This differs from the approach taken by other manufacturers, such as Honda’s excellent dual clutch transmission which caters to buyers who want to do away with the clutch lever altogether. But dual clutch transmissions come at a cost—they are rather heavy and complex, and the only manual control you have is via +/- pushbuttons on the handlebars. There is no proper manual option because these are not manual transmissions.

The GSAP system takes the best from an automatic—instant gear changes and smooth acceleration—without losing what many people consider the essence of riding a motorbike—connecting with the machine at all levels, and having full control over all functions.

If you get a chance to try out GSAP, don’t pass it up—it is impossible to form a meaningful opinion about the system until you try it for yourself.

Any minuses? Well, it's not cheap at around £500 installed, or £375 when installed at the factory (on the RT—not yet listed for the GS as a factory option). But it's only money. And sometimes you need to treat yourself.

Looking ahead


We have technology at our disposal to augment the functionality of mechanical devices in ways which could not be accomplished even 10 years ago. Some of it is for safety, such as traction control, ABS etc, and others are for fun, like the GSAP system. I believe it’s only a matter of time before other manufacturers offer similar types of tech for their bikes.

Doing away with throttle cables in favour of stepper motors, and computers to control the engine may scare off those hesitant to embrace change, but it’s important to bear in mind that jet planes—generally seen as the safest type of transportation—have been using fly-by-wire systems for decades.

In 2011, BMW announced their ConnectedRide concept, their vision of the future where, among other items, bikes and cars ‘talk’ to each other to announce their presence autonomously to avoid collisions—for example, automatically applying the brakes if a driver starts a turn without noticing a motorbike, while at the same time automatically flashing the lights on the motorcycle to warn the car driver.

I welcome systems like these because there are far too many distracted drivers on the roads, and anything that gives me (and my fellow road users) a little bit more safety can only be a good thing.

17 Apr 2014

First look: Gear Shift Assist Pro on the BMW R1200GS


The original Gear Shift Assist system has been available for a number of years on several BMW models of the K- and S-series, enabling clutchless upshifts by briefly cutting the fuel supply when the system senses an upshift via the foot lever.

Gear Shift Assist Pro (GSAP) is the next generation of this system, announced with the introduction of the updated R1200RT last November. The Pro version allows for both upshifts and downshifts and according to BMW this is a world first on a production motorcycle.

The R1200RT and the R1200GS are mechanically similar bikes, sharing an engine (with a couple of differences) and parts of the suspension system and frame—BMW has made available GSAP as an ex-works option for the first time on a GS. It is not compatible with the 2013 models, but only the 2014 update (models with the steering dampener)—namely those built from approximately 15 August 2013. There is no official word why this is the case, but I suspect it is simply that the 2014 spec bikes have a connector fitted in the wiring loom for the CAN-bus.

The Gear Shift Assist Pro unit

The GSAP system intrigued me greatly so I put in an order. I was informed that my bike was within the first 300 built which support the system—lucky me! BMW had some delays relating to the software which held up the order for a few weeks but the people in the service department at BMW Battersea (thanks Phil, Shanon and James!) had it installed on my bike within 24 hours of receiving the unit. Good communication and good service are what make this dealership excellent!

Below is BMW’s (rather thorough) explanation is included as part of the press kit for the new RT:


Optional Gear Shift Assistant Pro for changing gear with virtually no interruption in power flow.


The BMW Gear Shift Assistant Pro is another world first for production motorcycle manufacture. Compared to the Gear Shift Assistant already featured on the superbike models such as the BMW S 1000 RR, the system’s functionality has been extended for use on the new R 1200 RT and adapted to the specific requirements of a touring bike. The Gear Shift Assistant Pro enables upshifts and downshifts to be made without operation of the clutch or throttle valve in the load and rev speed ranges that are of relevance to riding, both increasing comfort for the rider and providing an added touch of dynamism. The majority of gear changes can be carried out with the help of the Gear Shift Assistant—starting off is one of the few exceptions to this.

When accelerating, the throttle valve no longer needs to be closed for gear changes, allowing the power to flow with barely any interruption. And when decelerating and shifting down a gear (throttle valve closed), automatic double-declutching is used to adjust the engine speed. Gears are engaged in the usual way with the footshift lever. Shift times are considerably faster compared to gear changes with operation of the clutch. The Gear Shift Assistant is not an automatic shift system, but rather just an aid for changing gear. When gear changes are carried out with the help of the Gear Shift Assistant, the cruise control is automatically deactivated for safety reasons.

The system works by employing a sensor on the gearbox output shaft to detect the rider’s shift request and trigger the assistance mechanism. By increasing or reducing engine torque by the required amount, the load on the powertrain is effectively eliminated to allow the shift dogs of the next gear wheel pair to intermesh in the same way as when the clutch is used. No gear shift assistance is provided when changing gear while operating the clutch, or when shifting up with the throttle valve closed (overrunning) or when decelerating. Neither will any assistance be given if the shift lever is not in its proper starting position when shifting up or down.

Assistance is available when downshifting with the throttle valve open, but this can provoke severe load change reactions, particularly in low gears. The same effect may be produced when changing down without operating the clutch while cruising at a constant speed. BMW Motorrad therefore recommends always using the clutch to change gear in these riding situations. Riders should also avoid using the Gear Shift Assistant at rev speeds close to the red line.

[ends]


So what’s it like to ride with GSAP? 


In a word (okay, two words) bloody amazing! Being a ‘school’ night I’ve only ridden about 20 miles around London so far with the system but I can’t wipe the smile off my face.

The sound is similar to dual clutch systems used on BMW M cars, higher end Audis and Volkswagens etc—complete with a pop from the exhaust on each gear change. And it’s fast, I’d say not much more than 1/10th of a second when upshifting. Combined with the high torque of the boxer engine, this translates to turbine-like, seamless acceleration from a standstill, smoother and faster than is humanly possible using the clutch.

It does take a little practice to acclimatise to the system and learn its quirks.

At a constant speed the system is not happy to make a gear change and this can result in some not-so-nice driveline shock. When decelerating the system doesn’t operate at all for upshifts.

Downshifts while decelerating with a closed throttle are accompanied by an automatic blip of the revs and the shift is slightly slower than upshifting to accommodate this—I’d say downshifts take 2/10ths of a second. It’s possible to downshift at a constant throttle, or around 10% throttle, but this can also cause a bit of driveline shock.

Gear changes using the system require dedication—no half-arsed attempts. You need to commit to the gear change in one smooth go, and the lever feels slightly heavier when using GSAP than when using the clutch normally. During one halfhearted 1st–2nd change I ended up in neutral—call it operator error.

However, learning its quirks has only taken about 20 miles of city riding (and associated frequent gear changes)—nothing in the grand scheme of things. In that short time it now almost feels agricultural to change gears with the clutch.

With Easter weekend looming—four days off (yay!)—and favourable weather in the forecast, I will have a chance to get out of the city on roads where this system will be in its element. Watch this space!

Brief update one day on


They—presumably experts—say during sleep your brain processes the things you learned that day. I guess they have a bit of a point. Riding to work and back today, everything just clicked—no herky-jerky, no missed shifts—everything as smooth as silk.

If only all things in life had such a comfortable learning curve.

Did I mention I like the GSAP system? Still smiling here!

Further information