cnt decide 535i or 550i??
03-11-2011, 10:31 AM
#41
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i take it you don't really know what torque is?
from http://en.wikipedia.org/wiki/Dynometer
horsepower = (torque x rpm) / 5252, so torque = (horsepower x 5252) / rpm
that means horsepower and torque are functions of each other, i.e. the same thing.
and you can tout your 0-60 findings all day, but i'm telling you the average person is not going to notice a 24-hp difference but will likely notice a 40hp difference (the difference between the 550i and 535i, weight considered), and especially the difference from a 530i to a 550i (65hp).
also, the closer you get to 0, the more value half a second has because it's proportion to the cumulative time is much higher. i.e. half a second difference between a 550 and a 535 is more significant than a half a second difference between the 530i and 535i. this is all true regardless of what real-world 0-60 times will get you, not just google results.
anyway, we could argue all day. point is that the 550i is most definitely a faster car unless you want to chip the 535i and that is all assuming you are willing to put up with the HPFP issues. there is absolutely no denying that no matter what numbers you are looking at stock for stock.
from http://en.wikipedia.org/wiki/Dynometer
horsepower = (torque x rpm) / 5252, so torque = (horsepower x 5252) / rpm
that means horsepower and torque are functions of each other, i.e. the same thing.
and you can tout your 0-60 findings all day, but i'm telling you the average person is not going to notice a 24-hp difference but will likely notice a 40hp difference (the difference between the 550i and 535i, weight considered), and especially the difference from a 530i to a 550i (65hp).
also, the closer you get to 0, the more value half a second has because it's proportion to the cumulative time is much higher. i.e. half a second difference between a 550 and a 535 is more significant than a half a second difference between the 530i and 535i. this is all true regardless of what real-world 0-60 times will get you, not just google results.
anyway, we could argue all day. point is that the 550i is most definitely a faster car unless you want to chip the 535i and that is all assuming you are willing to put up with the HPFP issues. there is absolutely no denying that no matter what numbers you are looking at stock for stock.
03-11-2011, 10:35 AM
#42
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My Ride: 545i/6
Save even more money and find a clean low mile 545i for around or under 20k. Performance wise its right in the middle of the 535i and 550i. Just saying lol.
03-11-2011, 10:40 AM
#43
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anyway, we could argue all day. point is that the 550i is most definitely a faster car unless you want to chip the 535i and that is all assuming you are willing to put up with the HPFP issues. there is absolutely no denying that no matter what numbers you are looking at stock for stock.
But..lol, yep a 550 is faster than a stock 535i... by a whole 2 tenths of a second faster to 60 (i takes ~.15 to blink). And the fact remains a 535i is an entire second faster to 60 than the 530i, if you want to be in denial and believe that most people couldn't tell the difference please be my guest.
With a few cheap & simple reversible mods the 535i is around a full second faster to 60 than the 550i and ~2.2 seconds faster than the 530i.
As I posted earlier:
I agree that if you're not interested in throwing a tuner on the 535i and/or are worried about the hpfp, the 550i is a smarter buy, especially if you don't care about the lower gas mileage.
03-11-2011, 10:42 AM
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03-11-2011, 11:46 AM
#45
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03-11-2011, 12:20 PM
#46
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Of course it is bench racing, this is a message board and those are the numbers given by BMW. Speaking of bench racing, how exactly does 1/4 mile trap speed tell the "real story"?? I personally rarely go 100+ mph on the street, if that is something that interest you, there is nothing stopping you from looking it up. Google.com
03-11-2011, 01:13 PM
#47
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hp = tq x rpm / 5252
tq = hp x 5252 / rpm
(this means torque is always equal to horsepower @ 5252 rpms)
2007 530i:
max hp - 254 @ 6000 rpm
max tq - 221 @ 4000 rpm
that means:
@4000 rpms, tq is 221, hp is 168 (221 x 4000 / 5252)
@6000 rpms, hp is 254, tq is 222 (254 x 5252 / 6000)
2008 535i:
max hp - 302 @ 5800 rpm
max tq - 295 @ 4000 rpm
@4000 rpms, tq is 295, hp is 224 (295 x 4000 / 5252)
@6000 rpms, hp is 302, tq is 273 (302 x 5252 / 5800)
let's assume the rpm band for a WOT run is 4000-6000, meaning you're most likely always going to see these tq/hp ranges as the two cars are racing:
530i: 221-222 tq / 168-254 hp range
535i: 273-295 tq / 224-302 hp range
there is so much info to infer from here, but the best thing to point out that i see is that this does show that the 530i keeps a constant 220 ft. lbs of torque as it accelerates in the 4k-6k rpm range, while the 535i actually has to gradually increase that from 273 to 295 in the same rpm range.
so then you go and look at how the torque displaces power (horsepower), you see the disparity in the 530 is 254-168=86 hp over the band and the disparity in the 535 is 302-224=78 hp over the band. if you divide the disparity by the total power displaced by the engine (so 86/254 = 34% for the 530i, and 78/302 = 26% for the 535i), then you can see that the 530i, in the 4k-6k rpm band actually produces more power (proportionally speaking) than the 535i in the same rpm band. yes, the 535i has more power, but in the 4k-6k rpm band, the 530i accelerates more with its given power. and, proportions aside, the 530i is creating more power in that rpm band, too.
this 25% vs 34% is not huge, but when you add in the true cost of the additional weight (approximately 200 lbs = 20 hp for the 535i), i think it's pretty evident how one (not familiar with the cars) would not be able to tell the difference between the 530 and the 535 in a test drive.
also, look up any quarter-mile calculator on the internet. none of them will have tq inputs. now, have fun with disputing the math.
03-11-2011, 01:32 PM
#48
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i'm going to do the math for you. please read this and do not get infuriated before you completely follow my math.
hp = tq x rpm / 5252
tq = hp x 5252 / rpm
(this means torque is always equal to horsepower @ 5252 rpms)
2007 530i:
max hp - 254 @ 6000 rpm
max tq - 221 @ 4000 rpm
that means:
@4000 rpms, tq is 221, hp is 168 (221 x 4000 / 5252)
@6000 rpms, hp is 254, tq is 222 (254 x 5252 / 6000)
2008 535i:
max hp - 302 @ 5800 rpm
max tq - 295 @ 4000 rpm
@4000 rpms, tq is 295, hp is 224 (295 x 4000 / 5252)
@6000 rpms, hp is 302, tq is 273 (302 x 5252 / 5800)
let's assume the rpm band for a WOT run is 4000-6000, meaning you're most likely always going to see these tq/hp ranges as the two cars are racing:
530i: 221-222 tq / 168-254 hp range
535i: 273-295 tq / 224-302 hp range
there is so much info to infer from here, but the best thing to point out that i see is that this does show that the 530i keeps a constant 220 ft. lbs of torque as it accelerates in the 4k-6k rpm range, while the 535i actually has to gradually increase that from 273 to 295 in the same rpm range.
so then you go and look at how the torque displaces power (horsepower), you see the disparity in the 530 is 254-168=86 hp over the band and the disparity in the 535 is 302-224=78 hp over the band. if you divide the disparity by the total power displaced by the engine (so 86/254 = 34% for the 530i, and 78/302 = 26% for the 535i), then you can see that the 530i, in the 4k-6k rpm band actually produces more power (proportionally speaking) than the 535i in the same rpm band. yes, the 535i has more power, but in the 4k-6k rpm band, the 530i accelerates more with its given power. and, proportions aside, the 530i is creating more power in that rpm band, too.
this 25% vs 34% is not huge, but when you add in the true cost of the additional weight (approximately 200 lbs = 20 hp for the 535i), i think it's pretty evident how one (not familiar with the cars) would not be able to tell the difference between the 530 and the 535 in a test drive.
also, look up any quarter-mile calculator on the internet. none of them will have tq inputs. now, have fun with disputing the math.
hp = tq x rpm / 5252
tq = hp x 5252 / rpm
(this means torque is always equal to horsepower @ 5252 rpms)
2007 530i:
max hp - 254 @ 6000 rpm
max tq - 221 @ 4000 rpm
that means:
@4000 rpms, tq is 221, hp is 168 (221 x 4000 / 5252)
@6000 rpms, hp is 254, tq is 222 (254 x 5252 / 6000)
2008 535i:
max hp - 302 @ 5800 rpm
max tq - 295 @ 4000 rpm
@4000 rpms, tq is 295, hp is 224 (295 x 4000 / 5252)
@6000 rpms, hp is 302, tq is 273 (302 x 5252 / 5800)
let's assume the rpm band for a WOT run is 4000-6000, meaning you're most likely always going to see these tq/hp ranges as the two cars are racing:
530i: 221-222 tq / 168-254 hp range
535i: 273-295 tq / 224-302 hp range
there is so much info to infer from here, but the best thing to point out that i see is that this does show that the 530i keeps a constant 220 ft. lbs of torque as it accelerates in the 4k-6k rpm range, while the 535i actually has to gradually increase that from 273 to 295 in the same rpm range.
so then you go and look at how the torque displaces power (horsepower), you see the disparity in the 530 is 254-168=86 hp over the band and the disparity in the 535 is 302-224=78 hp over the band. if you divide the disparity by the total power displaced by the engine (so 86/254 = 34% for the 530i, and 78/302 = 26% for the 535i), then you can see that the 530i, in the 4k-6k rpm band actually produces more power (proportionally speaking) than the 535i in the same rpm band. yes, the 535i has more power, but in the 4k-6k rpm band, the 530i accelerates more with its given power. and, proportions aside, the 530i is creating more power in that rpm band, too.
this 25% vs 34% is not huge, but when you add in the true cost of the additional weight (approximately 200 lbs = 20 hp for the 535i), i think it's pretty evident how one (not familiar with the cars) would not be able to tell the difference between the 530 and the 535 in a test drive.
also, look up any quarter-mile calculator on the internet. none of them will have tq inputs. now, have fun with disputing the math.
