Well, of course it doesn't have 530rwhp - that would be a REAL monster!!!bernhtp said:BMW is often a bit conservative in stating their power, and there is also some variability among the individuals cars, so I suspect they express power near the minimum range of what one can expect.
However, I did not see 530hp in the one dyno test we've had posted here.
I saw the dyno results, and I believe it tested at 420 rwhp, which would give you right about 500 HP at the crank for a good manual transmission.bernhtp said:It didn't seem to have 530hp at the crank inferred from the measured rwhp with normal drivetrain losses plugged in.
bernhtp said:I believe it was closer to 430rwhp, but still a good ways from an adjusted 530hp at the crank.
Wolverine said:The difference between the 507 and 500 hp specification is simply the difference between the SAE and DIN measurement methods. The bottom line is:
507 HP DIN = 500 HP SAE
Here's a good explaination of both:
SAE Net Horspower In 1972, American manufacturers phased in SAE net horsepower. This is the standard on which current American ratings are based. This rating is measured at the flywheel, on an engine dyno, but the engine is tested with all accessories installed, including a full exhaust system, all pumps, the alternator, the starter, and emissions controls. Both SAE net and SAE gross horsepower test procedures are documented in Society of Automotive Engineers standard J1349. Because SAE net is so common, this is the standard we will use to compare all others. DIN Horsepower This is a standard, DIN 70020, for measuring horsepower that very closely matches SAE net. The conditions of the test vary slightly, but the required equipment on the engine and the point of measurement (flywheel) remains the same. Because the test conditions are so similar, it is safe to divide DIN horsepower by 1.0139 to arrive at SAE net. This value is so close to equal that for all but the most technical purposes DIN and SAE net are interchangeable
M5DAL said:Simple really. In the old days the horses in America walk in feet. When horses were sold to Europe for movie making they could only walk in metres. As the riders were metricated. cherrsagai cherrsagai
warrenatc said:Hi all, Just got back from the Frankfurt IAA auto show, it was awesome. I spoke with Mr Felix Bast a manager at M at the Motorsport area reagarding several questions/answers I will post later. However regarding HP figures in regards to others which have posted dyno results showing more, he did say that they will provide a car with the stated Hp figures regardless, so all the cars produced will have at least 507hp. That tells me you could easily get a good engine with 5% more power. Pic of AC Schnitzer M5!