I still don't see why it's not possible to achieve 600+hp out of the M5 engine with a supercharger. If you guys take a look at the G-Power webpage, they have a kompressor unit for the 4.4L engine turning out 550hp. http://www.g-power.com/pr_kom.htm
So in theory, the 5L engine could probably do about 600hp with the same type of technology.
Terence
Just some simple things, why disappeared a man like John Hennessy from the MB without any results out of the great announcements with turbo charger and tuning things?
Why has BMW more blown engine than with any other M-model before?
And as a logic results out of this, why want people buy supercharger for the "fastest" sports sedan in the world?
And why can the lazy webmaster follow 6 ( in words SIX) M5 E39 with his "old" ´94 M3 3.0 without bigger problems?
I think when you find the answers to that questions, you don´t consider any more a supercharger upgrade.
I said this right from the start last fall, that the M5 engine would be very hard to tune and make into an 11 or 12 sec quarter mile care with 500hp. Nobody believed me. They all said that it was possible, and if anybody could do it Hennessey could. Well, it is now proving very difficult to tune the M5 engine. The big chip guys are saying there is no noticable increase in HP, just removal for the rev limiter. And extending the rev limiting 300-400 revs, won't do anything, the peak for the M5 is down lower. It is a v8 remember and not a vtec 4. The supercharger claim you are getting from G Power is a real stretch too. First off, it is not bolt on, but a complete rebuild, with lower compression pistons, etc... 550hp I think is also a little on the optimistic side. H&H took a 4 litre, bored it out to 4.4 specs, put lower compression pistons in and all of the good stuff and still only got 448hp. Tell me where the extra 100hp comes from? The stock internals of the M5 engine will not be able to to take a 200hp or 270hp boost of power. Ask any tuner this and they will tell you the same. With the positive displacement of a lysholm supercharger, you are sure to have engine failure, quickly.
Just because a tuner is reputable on another car, and made some power (some power = around 10% increase in HP without touching internals)... does not mean that the S62 has alot of hidden power. With cams and a computer, maybe 460 hp (maybe 12.7 quarter-mile vs 13.2 in my opinion).
Also agree about the increased revs, no power unless there are some changes to the intake (cams or otherwise).
And lastly, if you were going to pay for someone to tear your engine down for supercharger installation... then just get a race shop to build you the engine of your dreams and put the original motor on a stand to look at.
But in a car that weighs 4000 pounds, the real issue is low-end torque for daily driving. It needs more and that won't get fixed by anything except maybe a constand displacement supercharger. Lowering the compression with a centrifugal supercharger makes the low end even worse. The one thing I think the E55 has right is more torque and less horsepower.
I can see BMW increasing torque the old fashion way (or the '97 M3 way) through displacement. Look for a future M5 with 5.4 liters, more torque, nominal or no bhp increase and very few other engine changes. They have spent so much time on this engine's harmonics that I can't see them doing too much else.
I think all of you should explore the limits of the car in its stock form before going crazy with modifications. Take it to the track 2 or 3 times and then improve what you feel is lacking. Bet you lots of $$$ you will want better brakes and suspension before you worry about straight line performance. Also, you are in model year one, let someone else be the test mule. Could you imagine damaging the engine? Remember what Dinan concluded with the E34 M5? Easier to bore and stroke and add bigger cams than supercharge or turbo. More expensive but a better bet for a high compression engine. Those 700 hp Supras are turbo engines from the factory with 7:1 compression, etc. That's why they don't have to go inside the engine when increasing boost.
You are driving a 4000lb car. To get to supercar territory, like Modena or Porsche TT, you will sacrifice driveability and longevity. In fact, given the costs, you might as well sell the M5 and get the new Porsche.
Regarding tuning of the M5, I can post my 2 öre (Swedish cents )
We trst drove the Nowack M5 E39 with claimed 503 HP and 640 Nm. They haven't changed the displacement, changed other things.
We used up a ful ltank in 30 min, also going over 300 km/h with 4 people in it without any problem at 6 oclock in Germany whenever traffic allowed it.
I was impressed with the performance, but that was A, because I was in the back seat B, I was used to the M3. But we compared them head to head against the E39 we had on track (370 rearwheel HP measured the day after) and on sixth gear up to 3500 rpm the standard M5 was faster (also with 4 people in it!) up tp 3600 rpm when the Nowack started gaining.
But maybe that's logical, because the torque is lesser with a tuned car at lower rpms. But anyway, we left the standard M5 in the dust easy on the autobahn when we had didn't have traffic, but that was more becasue of the 250 km/h limit than the raw acceleration is my opinion. And for USD 20 000 you can do other things...
Gustav,
to my knowledge, the Nowack M5 only changed the airbox, camshafts and clutch to get 503HP. They never told me the price, but are you saying for just those three things they're charging $20,000 USD??
Terence
Quote:
Originally posted by Gustav: Regarding tuning of the M5, I can post my 2 öre (Swedish cents )
We trst drove the Nowack M5 E39 with claimed 503 HP and 640 Nm. They haven't changed the displacement, changed other things.
We used up a ful ltank in 30 min, also going over 300 km/h with 4 people in it without any problem at 6 oclock in Germany whenever traffic allowed it.
I was impressed with the performance, but that was A, because I was in the back seat B, I was used to the M3. But we compared them head to head against the E39 we had on track (370 rearwheel HP measured the day after) and on sixth gear up to 3500 rpm the standard M5 was faster (also with 4 people in it!) up tp 3600 rpm when the Nowack started gaining.
But maybe that's logical, because the torque is lesser with a tuned car at lower rpms. But anyway, we left the standard M5 in the dust easy on the autobahn when we had didn't have traffic, but that was more becasue of the 250 km/h limit than the raw acceleration is my opinion. And for USD 20 000 you can do other things...
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