Since this is BMWUSA, I assume these figures are for the 3.0 liter 325i?jgrgnt said:Woah, that's a lot of low-end torque:
Yes, this is for the 3.0 liter engine. I would guess the European 2.5L is down slightly at lower rpms.Rob325_in_AZ said:Since this is BMWUSA, I assume these figures are for the 3.0 liter 325i?
I wonder if that has anything to do with the low-end torque. I also wonder if the 2.5 325i in Europe will have that much low-end torque even if they managed to get the same peak numbers.
I guess that explains why some Acura TL owners complain that all the power is above 3500 - 4000 rpm!!DuckofPrey said:Torque is a measure of force, a rotational force to be more exact. Basically, it tells you how "hard" the engin turns the crank. "Low end" just refers to the lower end of the rpm range. So, an engin with a lot of "low end torque" will be able to accelerate the car faster at the lower speeds, like, say, when you're getting off the line.
What you want is the torque plot to be nice and wide while achieving a high torque number. So, you have x amount of torque at lower speeds and you accelerate at a rate of y. If that plot is flat, like you see on that plot above, you still have x amount of torque and higher rpm and thus your car will still accelerate at a rate of y. That's why you hear people say "there is lots of torque everywhere".
Certain engines, like a Honda VTEC system has tow different sets of cams: one low rpm one with low torque and good fuel economy and another high rpm one for high power and bad fuel economy. So, there is a step in the torque plot. Thus, when a VTEC engin reves high and the high rpm cam kick in, you will feel that jolt and there is more acceleration. This is because there was a sudden increase in the amoung of torque. This new Valvetronic thingy from BMW does a similar thing to what the Honda does, but not by having a different set of cams. It can continuously vary the timing and the opening of the valves so that you always have lots of torque. That's why that plot is so wide and flat. Since the BMW's system will give you high torque when you need it at any rpm and good fuel economy at any rpm, the valvetronic is the superior system. Also, its is much newer and more expensive...
Hope that helped..
man, i check that thing all the goddamn time, why the hell have they been so slow to release these updates... some of them were supposed to be released back in february/march and they kept postponing!Greg220 said:Checking the BMW website 3 times a day finally paid off. A new section "SMARTER" is now available! :thumbup: