550i motor

Originally Posted by jjsC6

TahoeM3

I want to follow up to our earlier discussions. As I thought about this later in the day, I do think I took your original response out of context. I think what you were saying is that the intake manifold is the best source of easy hp and I took what you said to mean that the intake was the problem on the car.

I apologize if you and I were looking at it from two different angles.

No worries...it's both but really more the intake design itself. When you see it, you'll realize they BMW clearly designed it to be restrictive and difficult to modify. There have been a few discussions on this. I'll post the pics.

I suspect that they designed the engine with certain goals in mind, then detuned it for the 550i/X 50i. It's easy to do if you cut back boost and limit airflow. That's why Dinan was able to get back an easy 95 hp by cranking up the boost. Beyond increased boost, the next limiting factor is going to be airflow...on the intake and exhaust side (esp downpipes). We will see what the tuners can come up with.

Originally Posted by nwilson44

With all do respect lol the new 550i is nice, however the precious M5 will kill that car in a drag race. It may start out close but the faster you go the bigger the gap will get. I don't even think the new M will hit 204 MPH. Could be wrong but the 550i won't. Got nothing against the new car, it just simply doesn't pull in the higher RPM range like the previous M5. The previous generation 550i and M5 had power bands that were very linear, the power just builds until redline. The new one hits you with a lot of torque throughout the range until, I think 5500, and then falls off dramatically enough to tell. With that said, there is no doubt that the new car is a better daily driver. I just like the soul, power delivery, and high RPM nature of the old one. Am I crazy or does someone hear where I'm coming from?

Stealth Pilot has a Dinan tuned 550 (501hp) and when I had that level of tuning, I had no problem beating E60 M5's at the dragstrip. With the N63, optimal performance is gained by shifting before the redline, but with an eight speed transmission it keeps the motor in the sweet spot.

Ohh you meant a stock M5. My bad. The one I'm considering has the dinan stroked 5.7L V10 with 628 horsepower. It's not stock haha my bad for the misunderstanding.

Originally Posted by nwilson44

Ohh you meant a stock M5. My bad. The one I'm considering has the dinan stroked 5.7L V10 with 628 horsepower. It's not stock haha my bad for the misunderstanding.

Stop being a troll. You made a valid point in your original post about the 550i running out of breath up top, then after that it turned south. The M5 motor on the E60, or the F10 for that matter, is designed with different goals in mind than the 550i. The point others were making is that with progress, the 550 has become as fast as the last generation M5. The Dinan stroker kit increases displacement to 5.8L and hp to 611, so you get 104 hp all for just $33,000. To get to 628 hp you have to spend another $5000 on exhaust and underdrive pulley, for a total of $38K on top of the M5 itself. Comparing that to an F10 550i in stock form or even with a $3500 Dinan chip (501 hp, +101 hp) is ridiculous. Besides, even with the stroker motor you would be slower than a new M5 (which is infinitely more tunable), so why waste your time and money?

The guys at the dealer said it had 628 horsepower. They just said it was stroked to 5.7. And your right they are totally different, I was just basically wondering why.

And I'd pay the money for more soul anyday. But that's me maybe not you

One man's soul is another man's issues.

You know what they say about single hot women...'somewhere is a guy who got sick of her'...

Your right, I may very well get sick of its short-comings but right now i love it. Has anyone here driven the new M5? Driving dynamics?