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View Full Version : Trivia--Can you identify these two BMWs?


JST
09-08-2003, 07:24 PM
How good are you?


BMW # 1:

Length: 194"
Width: 67.9"
Height: 53.7"
Wheelbase: 103.4"
Weight: 3570 lbs
Engine: 6 inline, DOHC 24V
LB/HP: 13.9

BMW # 2
Length: 176.8"
Width: 70.1"
Height: 54.0"
Wheelbase: 107.5"
Weight: 3415 lbs
Engine: 6 inline, DOHC 24V
LB/HP: 10.255


I'm reluctant to post any more, since I get into obvious things like displacement and 0-60 times that people are sure to know. It's also cheating to derive the total HP figure from the weight and HP/L numbers.

nate
09-08-2003, 07:53 PM
1. US spec "M6"
2. E46 M3

JST
09-08-2003, 08:18 PM
1. US spec "M6"
2. E46 M3


Huh. Too easy, I guess. But I am amazed at how dimensionally similar these two cars are; the M3 really is the same size as the old 6er.

Just lighter and faster.

So, for all of us E46 M3 owners, think this way: You don't drive a fat M3. You drive a skinny M6.

nate
09-08-2003, 08:28 PM
Huh. Too easy, I guess. But I am amazed at how dimensionally similar these two cars are; the M3 really is the same size as the old 6er.

Just lighter and faster.

So, for all of us E46 M3 owners, think this way: You don't drive a fat M3. You drive a skinny M6.
The 6 is a foot and a half longer though, and does not look as good.

Mr. The Edge
09-08-2003, 08:34 PM
I am amazed at how dimensionally similar these two cars are; the M3 really is the same size as the old 6er.


M3 is 1.5 feet shorter :dunno:

Kaz
09-08-2003, 10:56 PM
Definitely too easy to identify. Ironic how the heavier car is the more svelte-looking one.

andy_thomas
09-09-2003, 03:08 AM
Huh. Too easy, I guess. But I am amazed at how dimensionally similar these two cars are; the M3 really is the same size as the old 6er.

Just lighter and faster.

So, for all of us E46 M3 owners, think this way: You don't drive a fat M3. You drive a skinny M6.

Yes - but only the US "M6" was that porky and de-powered. The "proper" (if I can use that term) M635CSi was lighter and more powerful - 3,300 lb and 286 bhp, or 11.5 lb/bhp. Still 10% below the the M3, though. In terms of lb/lb-ft, the M635CSi would be superior.

So for you guys, the E46 M3 is an improvement. For the rest of us, we are laughing at how BMW managed to make a fat-arsed 3 over 100 lb heavier than a 6...

JST
09-09-2003, 07:33 AM
M3 is 1.5 feet shorter :dunno:


What motivated this was parking my car next to a 6. The M3 is 17 inches shorter, but that's entirely in the overhangs. Look at the wheelbases, and you can see that the M3 is actually a bit longer in between the wheels, where the passengers go.

I was trying to find interior and luggage specs for the two cars, but M6 tech data is a bit hard to come by. My guess is that the trunk on the M6 is marginally larger (though it's also flatter), but that the passenger compartment is similar or biased slightly in favor of the M3.

EDIT:

Found it:

1989 635CSi

Headroom - front (in.) 37.2
Headroom - rear (in.) 35.5
Legroom - front (in.) 41.7
Legroom - rear (in.) 29.9
Hip Room - front (in.) 56.6
Hip Room - rear (in.) 48.3
Shoulder Room - front (in.) 55.4
Shoulder Room - rear (in.) 54.6


2003 M3

Headroom - front (in.) 37.5
Headroom - rear (in.) 36.5
Legroom - front (in.) 41.7
Legroom - rear (in.) 33.2
Hip Room - front (in.) No Data
Hip Room - rear (in.) No Data
Shoulder Room - front (in.) 54.5
Shoulder Room - rear (in.) 52.7


Makes sense. The 3 is slightly taller, so the headroom is better, but the steeper tumblehome and presence of airbags in the doors and door beams restrict the breadth of the cabin a bit, cutting down somewhat on shoulder room.

I can't find weight figures for the M635CSi; the one site that claims to list them uses the exact same figure as the M6, so that doesn't seem credible. But the M88 made 251 lbs/ft at 4500 RPM, compared to 269 lbs/ft at 4900 RPM from the S54 in US trim. Using 3300 lbs as the weight for the M635, the M3 still has the torque to weight advantage, with 13.14 lbs per lb/ft. for the M6 and 12.69 lbs per lb/ft. for the M3. Despite the M88s lower torque peak, I bet if you laid dyno graphs alongside each other you'd find that the S54 has a flatter torque curve than the M88, due to VANOS and other such trickery.

The performance figures don't lie. The M3 beats the M635CSi badly in all measured acceleration, with 0-60 times of less than 5 seconds, compared to around 6 for the M635.

Jetfire
09-09-2003, 08:59 AM
The performance figures don't lie. The M3 beats the M635CSi badly in all measured acceleration, with 0-60 times of less than 5 seconds, compared to around 6 for the M635.

You bring up a very good point by way of this comparison. The various books I've read about the 6 seem to agree that the car was a high-performance (in the M's case, quite high) luxury coupe. The modern E46 M3, which is touted as BMW's sportiest car, is actually quite similar in execution to those old 6ers. It's a comfortable and quiet coupe with impressive performance numbers. I'd rather drive around town and take long trips in your car than any other 3, and the same was probably said about the 635 back in the day.