At the 2015 North American International Auto Show (NAIAS) in Detroit, German parts manufacturer ZF took the opportunity to showcase the second generation of its acclaimed 8HP eight-speed automatic transmission, promising improved efficiency, a higher spread of gears and reduced torsional vibration.
The main draw of the new 8HP – comprising of eight gears, four gearsets and five shift elements – is better fuel economy – up to 3% more fuel-efficient than the already frugal first-generation unit, which itself saved up to 6% more fuel than the old six-speed ‘box.
Contributing to the longer trips between the pumps is the increased spread of gear ratios – from 7.0 to 7.8 – thanks to optimised gearsets. On average, engine speeds are now reduced by 50 rpm, translating to a reduction of fuel consumption by almost one percent.
Transmission inefficiencies have also been reduced through multidisk separation – the shift elements feature more springs integrated into the multidisk packages, ensuring that the friction shift elements are almost fully opened, reducing drag torque. All in all, power losses have decreased by around two thirds compared to the first-gen 8HP.
Also reduced is the “creep” – the slow forwards motion in Drive without any throttle application. A clutch is fully opened during deceleration and when stationary, meaning that it is no longer necessary to hold the brakes at a stop. System pressure in the oil pump has also been reduced from 5 to 3.5 bar, resulting in less energy used.
Refinement has been improved with the use of torsional vibration dampers that stop engine vibrations from transferring through the drivetrain and into the body. A new torque converter more quickly bridges the hydrodynamic transmission of power from the engine, enabling a earlier engagement of the lock-up clutch at extremely low engine speeds.
Adding to lower fuel consumption is the uncoupling of the transmission, dubbed the “coasting” function, which can now operate at speeds of up to 160 km/h. The operation of the optional auto start-stop functionality has also been improved, shutting the engine down at a stop without any discernible delay, instead of 1.5 seconds previously.
Improvements were also made to facilitate spirited driving, with the ability of conducting nested multple downshifts giving the transmission a more spontaneous and dynamic response when necessary.
The second-generation 8HP went into production last July, slotted into the BMW 520d in 8HP50 guise designed for engines producing up to 500 Nm of torque. Later, an 8HP75 unit will come on stream, capable of handling up to 750 Nm. The new transmission will gradually be phased into by all the manufacturers currently utilising the outgoing unit.
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looks like a jet engine !!
That’s the result of true “R&D”, unlike some manufacturer using jerky Punch CVT which are not tested
Itu company Bkn cvt saja jerking….semua jerking la…ecu la…throtle body la….
the automatics are getting increasingly more efficient in terms of mechanical capabilities and fc.
Sam Loo Toyoda transmission is much much better with reliable guarantee forever won’t break down dino-aged museum level 4 speed gearbox
At least it’s much better than Punch CVT
They shud put this in Iriz maa aiyoo
Current ZF 8 speed is very impressive.. In comfort mode it smooth like a CVT. In Sport+ mode, totally different character and shift quickly with some vibration feedback like sport car..
Personally, I still much prefer automatic then the Dual-Clutch Type transmission.
but the tradition automatic gear will more longer lifespan compare dual clutch
No la ada old auto gear ada timing chain
tiiimiiinnggg chhhhhaaaaiiinnnnn!!!!!!!!
love the 1st gen ZF 8 speeder. smooth and zippy shifts. very efficient especially paired with the powerful 2.0 diesel turbo. always a conversation starter with new passengers in the car asking ‘how many gears are there on this thing? gear shifts seem to go on and on’.
Those germans… Once thy put their mind to sting, u can only be wowed…. Respec *
But no respect when seeing tow trucker busy making business with the car owner at roadside.
Welcome to real bolehland, even p1 is more reliable
Jerky Punch CVT more reliable?
Honestly, after looking at the video, how many of you actually understand how the damn thing works? :)
As long as it doesn’t break down unnecessarily, I’m OK liao.
Heh Heh…I still remember my grandfather’s car had a 3 speed manual and he starts of on 2nd gear. Only use 1st gear one time when the car just started. If he is alive now, he will have big bulging eyes looking at the statement 8 speed. Times have changed…
Best automatic transmission ever made, period.
Can last 1,000,000km?
Yes automatic normal transmision can go more than 1,000,000km. My friend volvo 850 last time clocked at 2,500,000km
Dear sudonano,
Please meet my friend, Manuel Transmission. I’m sure you will find him…’superior’.
my bicycle has 16 speed…..hihihihi
Mine 30, satisfied?
I thought reduced creep is not driver friendly, as you have to step gently on the throttle just to move slowly, unlike a car with lots of creep where you just let go of brakes slowly to make the car move slowly (no need to step on the throttle).
Reduced creep? It’s nice to know that the torque converter no longer drags during stops like a typical old fashion slushbox, but I bet typical Msian drivers won’t like it during a city/hill drive.
Punch CVT’s clutch-damper in Protons has this feature and most ppl didn’t like it as the car would occassionally roll backwards a little on a slope. (Amateur) drivers will have to move their foot frequently on hills, or be assisted with Hill Hold.
It’d be interesting to see how ZF address this issue.
Of cos, Sam Loo would proudly say that his 15 yr old Camry 4AT will beat the shit off this thing or any super high tech gearbox
Because Toyota makes the bestest, and most reliablest car in this universe
i thought ZF already came out with 9speed gearbox which already available in evoque?