RE: Toyota Yaris GRMN - Geneva 2017
Discussion
Andy S15 said:
...but the front end looks, I dunno, a bit too cute and soft? Japanese hatches have a weird feel of being a bit tall and thin - this one seems to still look that way to me and doesn't really say hot hatch. Maybe it's the daft graphics...
Think black would be the colour for me, here's a bit of quick and dirty photoshopping:
Edited by VeeFource on Wednesday 8th March 12:46
Love the sound of this. I think the Yaris looks great and appreciate the huge front grille for so many aftermarket cooling and intercooling opportunities. Little supercharged engines are a riot as well.
For fuel economy I would imagine this engine will function like many other Toyota engines and run Otto and Atkinson cycle?
For fuel economy I would imagine this engine will function like many other Toyota engines and run Otto and Atkinson cycle?
cib24 said:
Love the sound of this. I think the Yaris looks great and appreciate the huge front grille for so many aftermarket cooling and intercooling opportunities. Little supercharged engines are a riot as well.
For fuel economy I would imagine this engine will function like many other Toyota engines and run Otto and Atkinson cycle?
With it being supercharged I imagine it would be classed as the Miller cycle: https://en.wikipedia.org/wiki/Miller_cycleFor fuel economy I would imagine this engine will function like many other Toyota engines and run Otto and Atkinson cycle?
VeeFource said:
With it being supercharged I imagine it would be classed as the Miller cycle: https://en.wikipedia.org/wiki/Miller_cycle
Thanks for that. Can such an engine still be dynamic with a supercharger for highway economy or sustained low load low RPM situations? ELUSIVEJIM said:
Great to have something different but are they going down the wrong route.
I think it's exactly that - something different. Everyone has a turbocharged engine these days, what would make the Yaris different among lofty company like the Fiesta ST, Peugeot 208 and Mini Cooper?Toyota can have a less efficient car in their lineup without too much penalty (small manufacturers couldn't), but as a halo model why not fit a supercharger? That's before you've got to the clever tech as mentioned above.
cib24 said:
Thanks for that. Can such an engine still be dynamic with a supercharger for highway economy or sustained low load low RPM situations?
Altering the compression stroke length using variable valve control effectively gives variable compression albeit relative to a fixed power stroke. So the engine can essentially be dynamically altered to give either reasonably good economy under light loads or high power under heavy loads. It should mean the car's capable of acheiving decent economy and low emissions for it's ultimate power output despite the parasitic losses of the supercharger. But expect it to be pretty thirsty when pushed, even more so than an equivalent turbocharged engine.ELUSIVEJIM said:
Very surprised they are going down the supercharged route.
The WRC car is obviously turbo charged and a supercharger will have a much higher g/km.
Great to have something different but are they going down the wrong route.
If it is a centrifugal unit which is often referred to as a "belt-driven turbo" then I'm sure the g/km will be competitive. Boost rises with these units and peaks at the top so the car drives like it's N/A with a spiky top end. The WRC car is obviously turbo charged and a supercharger will have a much higher g/km.
Great to have something different but are they going down the wrong route.
However, I doubt it will be centrifugal and it will likely be a roots style supercharger which provides near max torque very low down and remains flat almost all the way to redline like modern variable geometry turbos. They are more compact to package and for a small car it makes more sense so that you have a nice and punchy mid range. Plus, they give the supercharger whine that everyone loves.
Personally, I think it's an awesome approach.
VeeFource said:
Altering the compression stroke length using variable valve control effectively gives variable compression albeit relative to a fixed power stroke. So the engine can essentially be dynamically altered to give either reasonably good economy under light loads or high power under heavy loads. It should mean the car's capable of acheiving decent economy and low emissions for it's ultimate power output despite the parasitic losses of the supercharger. But expect it to be pretty thirsty when pushed, even more so than an equivalent turbocharged engine.
Are you sure it will be more thirsty though? If its a roots style system and that means positive boost from a very low RPM like most modern turbo cars are designed, then I would imagine fuel use would be quite similar. Everyone knows with a forced induction motor that once you are in boost you consume fuel at a much much higher rate than normal. And on small engines you are in boost almost all the time because the turbos are tiny and the only way to make decent progress is when in boost. That's why I hated the Ford Fiesta 1.0L ecoboost rental I was given. It was rated for over 60 mpg highway but nearly the entire time you were driving the car on the highway you were in boost just to keep it at 70-80 mph, so your mpg ended up being about 40.
Ste1987 said:
Surprised they didn't have a dabble in doing a hybrid hot hatch
Hot hatches are already heavier then the base model (bigger engine etc.. ARBs), i imagine adding a heavy hybrid system to the mix wont make for a nice handling package.Making this yaris hybrid would probably make it more interesting in terms of taxation, but they would flat out lose every head to head review with a proper hot hatch.
From a previous thread:
They did a supercharged Corolla with 215bhp. I don't see why this wouldn't be 210bhp.
Accountants must be fighting a losing battle at the moment...
Blayney said:
ad13 said:
hora said:
210?
Doubt it. By the time it reaches production it'll be 100-120bhp.
This was my thinking... 210hp is more than a toyobaru!Doubt it. By the time it reaches production it'll be 100-120bhp.
hora said:
Blayney said:
They did a supercharged Corolla with 215bhp. I don't see why this wouldn't be 210bhp.
Accountants.cib24 said:
I doubt it will be centrifugal and it will likely be a roots style supercharger
Or a screw type supercharger - they're more efficient than a roots type. It wouldn't surprise me if it was electrically driven or on a clutch, or some other witchcraft. If the engine can switch between different cycles it might only use the supercharger in one cycle.Gassing Station | General Gassing | Top of Page | What's New | My Stuff