Featured New VW Engine

ingenious, but reliable? how does it test out on pollution?

 

Diesel-like fie economy.
You mean under testing it is more economical than in real world use?

 

Yikes.

sounds like a similar system to the $295 ford start stop system. That does great on nedc cycle but doesn't improve things much on epa cycle at all.

Since this is europe only I'm assuming premium gasoline type octane, where mazda's skyactiv-g makes 14:1 compression. THey say 10% more efficient than the 1.4l turbo.

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That's about 1 mpg better than the honda civic with a 1.5l turbo. Its not a huge step. Add a 48V bas system to a civic and you probably boost it 2 more than the jetta turbo ;-)

Don't believe the hype. If you dropped that new 2L toyota engine in a corrola it would probably get better fuel economy in the real world than a jetta with this new blue motion micro hybrid system. All the turbo engines from major manufacturers run at least part of the time in miller cycle.[/quote]

 

Last week one of these 1.5TSI was tested in a portuguese mag. Fuel consumption recorded: 34.5MPG.
"Not bad", the journalist wrote, stating "well, it delivers 150hp".

I say it is a very weak step forward...

 

not bad in a 6,000 lb truck though.

 

Micro-hybrid is a long time synonym for an auto start/stop system. What is new here is that VW is shutting off the engine during coasts instead of just stops. How effective it is depends on the battery capacity. 12 volts won't be running the A/C.

 

Yes, they seem to be promising something that technically is tough

We don't really know how big the micro hybrid lithium battery will be. They claim 4.8l/100km on nedc combined, its hard to believe it would be 5.2l/100km and this will help 8%, versus deactivating 2 cylinders down to 0.75 L of pumping. I am deeply skeptical that this will get nearly the bonus in the real world (IRL) or epa testing.

The main blurb talks about a variable geometry turbo which are used on diesels versus the twin scroll used on gasoline 4 cyclinder engines like the honda and toyota 4 cylinder turbo charged energy. The downside of variable geometry turbo chargers is they are more expensive than twin scroll which many consider good enough. The downside of twin scroll is turbo lag, which doesn't matter if you have even a mild hybrid ;-)

I wonder if vw will even call it a micro hybrid if they sell it in the North America.

 

Diesel-like fie economy only when EPA test it

 

That is what I typoed in post 3

 

But will the EPA test under report its fuel economy like it does for actual diesels.

 

I think they reserve that treatment for hybrids.

 

Actually, if go to Fuelly or other such tracking sites, you'll see that the average reported fuel economy for most cars, including hybrids, is pretty close to the post 2008 EPA estimate for combined. Remember, the 2008 changes were because people were complaining that hybrids weren't reaching the higher estimates back then. My 2005 Prius had a 60mpg value on the window sticker.

For diesels, such user tracking sites was showing that the estimates were under reporting what the cars would get in the real world. That data was pre-2008, and thus before the stricter emission targets. So I can't say if the EPA results are still under reporting what the cars get with the emission controls they now use.

 

poor poor VW . . . . will they ever get a fair shake ??

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I think they need to shake out a few more corrupt executives (is that a redundant term?) first.