F150 2.7 EB vs 5L V8 towing mpg
The 2.7 EB truck had a 3.55 axle, the 5.0L had a 3.31, both 10 speed auto crew can 4x4s, towing a 7000# horse trailer. The 5.0L V8 rated at 395hp/400tq did 9.8 mpg The 2.7L EB rated at 325hp/400tq...
Forum Discussion
Groover wrote:
I still don't feel like anyone has explained why turbocharging a gas engine is so much less effective than turbocharging a diesel.
I don't know what you mean by less effective?
You can get WAY more power out of a turbocharged gasoline engine than a turbocharged diesel engine if all things are equal.
You turbocharge a gas engine for way different reasons than turbocharging a diesel engine.
You turbocharge a gasoline engine to make more power because of stoichiometry. The more fuel AND air you pack into a gasoline engine the more power you make. One can turn a little 3.5 gasoline engine into a 7 liter engine or even a 10 liter engine or more.
Remember, with a gasoline engine you have to have stoichiometry. You don't with a diesel engine. There is no stoichiometry with a diesel engine. The more fuel you can pack into a diesel engine the more power you can make until the engine melts down or hydrolocks. That is the two limitations of a diesel engine. You turbocharge a diesel engine to make it burn more efficient and to keep the EGT's down so you won't start melting pistons and other parts.
One can make a ton of power with a N/A diesel. It just gets really hot and starts to melt down. If you turbocharge the engine you can make more power and keep it from melting down.
The more you turbocharge a gasoline engine the hotter the EGT's get. The more you turbocharge a diesel engine the cooler the EGT's get.
That is an important difference.
