ZF-EcoLife makes buses quieter (en) 

"ZF-EcoLife makes busses quiter" ha! what? But I want my busses to sound like Formula 1 air raid sirens!

True

@@docdaneeka3424 yes🤣

@@docdaneeka3424 if you have a bus with Ecomat Just kickdown every acceleration to give the passengers a crazy vibe

@@Varna_Buses_Lantane kickdown all the way to gear D3. That's a crazy vibe.

They still make noise. I explained it all in a video. Go check it out

Thats not true, Voith still do the same sounds they did since day 1

Yep

SBS 3920B YAAAA

Voith is nice

*_•reshirm•_* I know

In Finland at least, the bus routes are heavily contested. So every drop of fuel the companies can save on paper they will try to save. You have marketed Ecolife as economical and I can say, yes, on some cases, it is pretty economical. But at first let's look at some conclusions we can draw from this video, and how the comparison is unfair.

First of all, the Voith-equipped vehicle is closer to the kerb than the Ecolife-equipped one. It might only be about 5-10 cm, it's difficult to say from this angle. But look and it is closer. This distorts the results. I agree that Voith is louder, but that is because it is better for the engine, driver and passengers in terms of smoothness.

Secondly, inside, the microphone has a higher gain on the Voith-vehicle. You can see it easily, the door-locking click is around 2 dB(a) louder on it. How can it possibly be? They are supposedly identical vehicles. Probably you stuffed a lot of noise insulation under the hatches just to make the gears 1, 3 and 6 inaudible.

Thirdly and most importantly, is the engine. Yes it seems that the OM936hLA can cope pretty well with low revs. That's good. But there are plenty of engines that cannot: Volvo's D8K, FPT Tector 7 and Cursor 9, Cummins ISBe 6.7 just to name a few. They require around 1000 revs to get properly going, or else they'll vibrate and resonate across the cabin as the engine is struggling to accelerate the vehicle because of the stupid gearbox.

Getting going is the most important part in line traffic. Because it uses the most fuel, you want it to be over quickly. And struggling around suboptimal revs is NOT the answer. Why? Because of efficiency percentages. Engines are at their most efficient points at the peak torque band. They use more fuel per energy generated outside of that band. Forcing engines to use more fuel for the same kind of acceleration is idiotic. Not only fuel, but on some engines the oil pressure is minimal on low revs. So you're asking an engine to practically destroy itself over long-term? All because of those "saved" fuel droplets...

Did you heard ZF Ecomat 6HP 604C? I think it has way better sound in changing gears to D3 and D6 than 504C.

İndeed

I witnessed it a few days after my comment when I was on a EcoLife transmission Citaro being driven with its Kick Down haha

I like the whistle and howling when it slows down with the EcoLife ones and when it goes up and down gears. Very tuneful and bloody fast.

glad you enjoy our product so much !;)

u didnt make voith@@zfgroup

YEA

*_•hxxcker.reshirm•_* Ecolife gearboxes are still loud. I explained it all in a video on RU-vid.

You've summed it perfectly

some of it in my city (check my urbino 18 videos) many of them have a yelling ZF EcoLife

To bude tím, že ZF právě řadí v nízkých otáčkách, narozdíl od Voithu, který to tahá do větších kvůli 4 stupňové převodovce (nebo 5) :)

Volvo D8K and Zf all bus vibrating.

A bus engine emits approximately 70 dB. 6 times this would be 420 dB, this is impossible !

***** What you are saying is untrue as the noise level pressure measured in decibels does not increase in a linear way.

***** Can you explain to me how it is possible for an engine to make 6 times the noise of the same one just because the gearbox is different ? Thanks :)

The sound pressure level is a logarithmic function and not a linear scale. When sound level pressure increases 20 dB(a), the absolute pressure is increased ten times. That means it will sound 10^1 times as loud. A 40 dB(a) increase means a 10^2 increase and 60 dB(a) means a whopping 10^3 increase. But this comparison is completely unfair for Voith, as the driver was told to set off using kickdown which was disabled on the Ecolife box and not on the Voith one. 👎

***** "When sound level pressure increases 20 dB(a), the absolute pressure is increased ten times." So when ZF says the engine makes 6 times more noise with Voith than with ZF, it makes less than 20dB more noise ?

Kyllä

For real man. I’m sensitive to Loud Sounds, so I’m glad they they are putting efforts to reduce Bus traffic noise.