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      04-30-2009, 08:11 AM   #1
BForbes
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750i horsepower VERY underrated!

http://blogs.edmunds.com/roadtests/2....photopanel..2.*

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Yup, that's our long-term 2009 BMW 750i on MD Automotive's Dynojet chassis dyno in Westminster, CA.

And why not? After all, its 4.4-liter V8 is not only twin-turbocharged and equpped with direct injection, it's been turned inside out. That's right--the intake manifolds are located where the exhaust manifolds usually live, and the turbos nestle in the vee formed by the two cylinder banks.

Does this unconventional layout actually work? Is Nutella a delicious spreadable chocolatey substance? When we finally defeated all of the 750i's numerous electronic protections (including one that throws the transmission into Park if the wheels turn while the door is open), we found out just how angry this flagship luxury liner can be.

Hit the jump for the dyno chart.

BMW rates the 750i at 400 horsepower at 5,500 rpm and 450 pound-feet of torque at 1,800 rpm.

We started our run after 2,000 rpm and found that peak torque arrived a bit later than BMW's claim. Nevertheless, it's safe to say that the engine is, shall we say, robust. What's more, while on the dyno the BMW breezed right up to the rev limiter with little more than a whoosh, as if it wasn't even working hard.



As you can see, there's a big shelf of torque available all the way through the midrange. Torque rolls off steadily past 4,600 rpm followed by a more precipitous drop at 6,500 rpm. Without running all the numbers, it's likely that the BMW turns in its best acceleration times by shifting well short of its 6,700-rpm rev limit.

It's worth noting that turbocharged cars generally produce "high" chassis dyno results relative to normally aspirated cars rated at similar power. Part of the explanation is due to the turbo car's intercooler--automakers tend to heat soak the intercooler to somewhat higher temperatures during their certification process than what you get on a chassis dyno. The result is that the numbers claimed by the automaker end up appearing a bit conservative. And that goes for pretty much any modern turbocharged gasoline engine.

Conservatively rated or no, this sucker's quick. We clocked the 750i at 5.2 seconds to 60 and 13.5 @ 103.7 through the quarter mile. Not bad for a 4,600-lb sedan.

Jason Kavanagh, Engineering Editor

It looks to be putting out 391whp! In reality, its putting out over 450hp.
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      04-30-2009, 12:31 PM   #2
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Quote:
Originally Posted by BForbes View Post
http://blogs.edmunds.com/roadtests/2....photopanel..2.*


It looks to be putting out 391whp! In reality, its putting out over 450hp.
Interesting and thanks for the post!
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      04-30-2009, 02:32 PM   #3
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I just saw that on edmunds, very impressive.
That car must spin the tires quite a bit, because a 5.2 0-60 seems relatively slow for that car with that power/weight ratio.
Compared to the Mercedes S550 which does a 5.3 0-60 with less hp at the crank than the bimmer has AT THE WHEELS, this seems odd...
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      04-30-2009, 03:14 PM   #4
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With those numbers the car is making more like 460 hrp and 511 Torque at the engine...........Oh Man that engine is a BEAST!!
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      05-01-2009, 12:28 AM   #5
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      05-01-2009, 03:04 AM   #6
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So if all the BMW turbo motors are this conservatively rated, does it mean the 760i will actually be around 600hp?
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      05-01-2009, 05:30 AM   #7
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Beast.
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      05-01-2009, 06:54 AM   #8
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ohhh wow....move over AMG's
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      05-01-2009, 08:13 AM   #9
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Wow. Definately a Beast.

4600lbs? Seems like the 750i could use a diet...
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      05-01-2009, 11:25 AM   #10
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      05-01-2009, 01:33 PM   #11
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Does anyone know what the 2009 740i dynos at?
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      05-01-2009, 02:54 PM   #12
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Quote:
Originally Posted by GreenPlease View Post
Wow. Definately a Beast.

4600lbs? Seems like the 750i could use a diet...
Go test drive it and take it on some twisty roads. I usually like my cars small and light and consider my E90 (non sport, so it has 205 width tires all around) portly and always felt it could lose a couple hundred pounds.

With that said, the F01 blew me away. Completely. I would have no problem justifying spending a hundred grand on one, if I had it.
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      05-01-2009, 06:23 PM   #13
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This engine in the next 5-series, is going to be insane. With a simple tune, it will roast everything.
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      05-02-2009, 02:35 PM   #14
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Quote:
Originally Posted by 135forthewin View Post
I just saw that on edmunds, very impressive.
That car must spin the tires quite a bit, because a 5.2 0-60 seems relatively slow for that car with that power/weight ratio.
Compared to the Mercedes S550 which does a 5.3 0-60 with less hp at the crank than the bimmer has AT THE WHEELS, this seems odd...
The simplest solution is to conclude that even Merc rates their V8 conservatively.
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Being a fan of Honda engines, I requested that they consider building for the F1 a 4.5 liter V10 or V12. I asked, I tried to persuade them, but in the end could not convince them to do it, and the McLaren F1 ended up with a BMW engine.
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      05-02-2009, 03:38 PM   #15
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Quote:
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Wow. Definately a Beast.

4600lbs? Seems like the 750i could use a diet...
why would u give a 7 series big body german sedan a diet. without the weight u wouldnt have that ride comfort. even if the car was 5000 lbs i'd be all over it.
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      05-03-2009, 02:21 AM   #16
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new jaguar xjr coming out next year is said to be only 3700 lbs. How Jaguar managed to get a flagship 510hp car weighing that much simply blew me away. We shall wait and see how it compares to the 750.
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      05-03-2009, 02:27 AM   #17
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new jaguar xjr coming out next year is said to be only 3700 lbs. How Jaguar managed to get a flagship 510hp car weighing that much simply blew me away. We shall wait and see how it compares to the 750.
They probably use inflatable seats and steering wheel... You need to inflate them yourself before you can drive the car
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      05-03-2009, 02:43 AM   #18
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Quote:
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new jaguar xjr coming out next year is said to be only 3700 lbs. How Jaguar managed to get a flagship 510hp car weighing that much simply blew me away. We shall wait and see how it compares to the 750.
They've probably added the engine and gearbox to the options list!
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      05-03-2009, 03:39 PM   #19
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lol. It's because the car is built entirely out of aluminum. But if you were to get into an accident....it would cost a lot more to fix.

P.S. The current XJ weights 3,770 lbs. So making the next gen weigh less than 3700 isn't a far fetch.

Last edited by Master Deep; 05-03-2009 at 03:55 PM.
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      05-03-2009, 04:41 PM   #20
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Quote:
Originally Posted by Master Deep View Post
new jaguar xjr coming out next year is said to be only 3700 lbs. How Jaguar managed to get a flagship 510hp car weighing that much simply blew me away. We shall wait and see how it compares to the 750.
It has an all aluminium body in its present iteration and since the latest one is supposed to be just rebodied to show their current language, i expect more of the same.

It should properly kick the ugly 7's head in the lavatory and goose its mother, i cant wait to see it!
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Being a fan of Honda engines, I requested that they consider building for the F1 a 4.5 liter V10 or V12. I asked, I tried to persuade them, but in the end could not convince them to do it, and the McLaren F1 ended up with a BMW engine.
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      05-03-2009, 04:42 PM   #21
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Quote:
Originally Posted by Master Deep View Post
lol. It's because the car is built entirely out of aluminum. But if you were to get into an accident....it would cost a lot more to fix.

P.S. The current XJ weights 3,770 lbs. So making the next gen weigh less than 3700 isn't a far fetch.
Oops, just looked to see that you answered it yourself.
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Being a fan of Honda engines, I requested that they consider building for the F1 a 4.5 liter V10 or V12. I asked, I tried to persuade them, but in the end could not convince them to do it, and the McLaren F1 ended up with a BMW engine.
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