Why do so many people get the BHP figures wrong

[Woots]

Mine made 321bhp @ 7,300 rpm in April on a BMWCCGB rolling road day. The car is totally stock. I'd hope that it would be pretty close to the 338 figure at 7,900 based on those results.

why didnt they continue to max revs??

Max power in a z4m would've broken the rollers

 

[Franzino]

:| So, we do have the more powerful engine. I noticed on the Pistonheads advert listings its showing as 338, why can they show 343.
I wonder what the average Z4M would show on a rolling road in terms of HP

id guess around 320hp..... ive never seen an s54 dyno at the bmw stated power :? :? :?

100% true...a good oem Z4M engine will make something like that. My result was 330hp instead of the stated 343... The guy who did my dyno run said that 330 is a very good figure for a s54. It almost never happens that a OEM S54 engine delivers the promised horsepower from BMW.

[youtube]?v=gwH6Rw9evPY[/youtube]

 

[mad4slalom]

5-5 speak for yourself .... i ,of course am a driving god...4.5......ish

 

[mmm-five]

Is the reason for not making the full monty on a static dyno due to the small ram charge the car gets with the OEM intake?

 

[exdos]

Is the reason for not making the full monty on a static dyno due to the small ram charge the car gets with the OEM intake?

Give that man a prize!

 

[Woots]

Is the reason for not making the full monty on a static dyno due to the small ram charge the car gets with the OEM intake?

Give that man a prize!

Anyone got a graph to explain this?
:| :wink:

 

[exdos]

Anyone got a graph to explain this?
:| :wink:

You know that I have! 8)

 

[mmm-five]

Is the reason for not making the full monty on a static dyno due to the small ram charge the car gets with the OEM intake?

Give that man a prize!

I'll take one Exdosramkit please!

 

[exdos]

I'll take one Exdosramkit please!

Doesn't he play on the wing for Galatasaray? :wink:

 

[craig3.2]

Also the z4 m has been tested for 0-62 times at both 4.9 and 5.0 s to secs,depending on tester/conditions,etc..so things can obviously vary a bit,but wouldnt bother me,as the are great cars to drive

I thought it was 0-62 mph (0-100 km/h) in 5.0, 0-60 mph in 4.9?

Yes,this is probably true,but having read magazine articles over the yrs,the diff between the 0-60 and 0-62 can be anything from 1tenth to 3tenths of a second.......
plus,i was Actually taking the figures from tests i remember seeing/reading,and diffirent mags,etc have put the z4m as 4.8/4.9/5.0secs,which has been recorded during their actual tests,as tested on the day...and not from Manufacturers stats.

As woots said tho,its quite hard in the real word to get near the exact times