Gas vs. Diesel (Ecodiesel)
I read this topic quite a bit here so here's PUT.com attempt to pencil whip the cost of ownership comparing some gas engine trucks to the new RAM Ecodiesel truck. Link Enjoy...
Forum Discussion
wilber1 wrote:Turtle n Peeps wrote:
And before anybody jumps on the 4 speed deal, my diesel, just like almost every diesel in the world has a Broaaaaaaaaaaaaaaaaaaaad torque curve so I don't need 6, 8 or 14 speed to keep it in the torque curve or power. With a double overdrive about the only thing a multi speed tranny does above a 4 speed is get slightly better fuel mileage anyway.
Nope. HP is a function of torque and RPM. If you don't have a gear that will allow you to maintain peak HP RPM at WOT, you ain't making peak HP. Don't care if it is gas or diesel.
Your 4 speed is a 3 speed with single overdrive. The 8 speed is a 6 speed with double overdrive. It has twice as many ratios as your 4 speed before it even gets to overdrive and it has twice as many of them.
Yes, you will lose HP but it's so negligible it's not even worth talking about. Look at the LML in the chart below. From about 2,600 to about 3,100 you lose next to nothing. Even below 2,600 you lose HP very slowly.
