June 30, 2013, 6:16 pm
Originally Posted by d geek
So do you really think driving a 320i would be comparable to driving a 328d? The 'd has 40% more torque.
God no. Absolutely not. First, let's forget about torque, because more torque "down low" also just means more Hp down low. So let's stick with Hp. now let's plot the Hp of both engines on some normalized RPM axis that puts the peak Hps at the same spot. These peaks are about the same. But as you move to lower RPMs, the diesel will have higher peak Hp there. So its curve will be "fatter."
Now if you are driving aggressively, meaning with aggressive gear selection, both engines are producing comparable Hp, and so the diesels low end Hp will not come into play at all.
But if you are driving around down, from stop to stop, then you have no choice but to go through the lower RPM range when you start and you will feel the difference there. You could negate that to some extent if you do high RPM launches, but no one will do that. But once you have gone through most of first gear, the 320 can match the diesel, as long as aggressive gearing is used. But again, I concede that most people rather be more relaxed with throttle and gearing, so the diesel will feel more powerful under those circumstances. But if you really ever need all the power, it's there to be tapped so long as you put the transmission in the right gear.
So how different they will feel will depend on the type of driving you are doing. I am sure you already know everything I said above. But I feel like it is important to elaborate on these details for anyone who is interested at all in the topic.
All else being equal, I would pick the engines in this order: 328, 328d, 320. But all else is not equal, so people will pick according to their priorities: price, mpgs, servicing, etc., all come into play.