MSN Front Page news about turbo's and F/E

[pgfpro]

Something most prople are ready knew but their now telling the mass public.

http://editorial.autos.msn.com/lista...1381&GT1=22022

[bowtieguy]

does it really increase FE? what about emissions--they're kinda recycled.

[theholycow]

The confusion about turbos is because people think that the energy used to spin it is otherwise wasted. That's not true. The reason that turbos can help with fuel economy is because you can then use a smaller, less powerful more efficient engine with the car and the turbo only runs when you ask for lots of power.

[fowljesse]

Also, a small turbo uses the expanding exhaust gas's energy that is otherwise wasted, to basically help the engine not pull as hard to suck the intake into the cylinders.

[imzjustplayin]

Originally Posted by fowljesse

Also, a small turbo uses the expanding exhaust gas's energy that is otherwise wasted, to basically help the engine not pull as hard to suck the intake into the cylinders.

Well I don't know if they're using a light pressure turbo or not but if they're not, then the primary purpose of the turbo is just to allow the usage of a smaller displacement engine while having the power of a larger displacement engine. If they just stuck with the lower displacement engine without the turbo and drove the car conservatively, it'll get better mileage than the same car with a turbo driven in the same manner. I think the only time the turbo would actually benefit is if the same car is driven moderately with the turbo or driven hard without the turbo (i.e, same coefficient of performance demand). So for the EPA cycle it may not benefit but for most drivers, they may actually see the benefit, even if their driving habits are wasteful and stupid.

[GasSavers_JoeBob]

I think the point is that most people want a car with some power. Most people are not content to sit behind me while I poke up a steep hill at 40 mph in my 993 cc car. Neither will most people accept that level of power in the cars they drive. A turbo is a good way for people to have their cake (FE) and eat it (better acceleration, passing power, power to climb hills at the speed limit, etc) too.

[spotaneagle]

Originally Posted by *************

Well I don't know if they're using a light pressure turbo or not but if they're not, then the primary purpose of the turbo is just to allow the usage of a smaller displacement engine while having the power of a larger displacement engine. If they just stuck with the lower displacement engine without the turbo and drove the car conservatively, it'll get better mileage than the same car with a turbo driven in the same manner. I think the only time the turbo would actually benefit is if the same car is driven moderately with the turbo or driven hard without the turbo (i.e, same coefficient of performance demand). So for the EPA cycle it may not benefit but for most drivers, they may actually see the benefit, even if their driving habits are wasteful and stupid.

I think this depends when the engine hits boost, that is whenther its actually more efficient, jetta tdi is a good example to work off of in this convo..

as far as i know the boost is very low and the mileage is very high, and the turbo allows the car to run in a higher gear (4vs3) and at lower rpms probably caused by increased vaccuum pressure...

[spotaneagle]

http://news.yahoo.com/video/environm...49659/19254540

more news about fe stuff, funny they should give gassavers 25grand to advertise itself