E36 M3 321BHP????
Discussion
Power at the wheel as given by a rolling road is different to the power at the crank as quoted in manufacturers literature.
A rolling road will generally give a reading of about 87% of the power at the crank due to friction and inertia of transmission components.
321bhp * 0.87 = 279bhp
A rolling road will generally give a reading of about 87% of the power at the crank due to friction and inertia of transmission components.
321bhp * 0.87 = 279bhp
Dave 321 said:
My M Coupe was 306 bhp, my brother brought his to same rolling road. He had 308bhp, got it Unichipped, now 320.9bhp.....
My standard car made 322 : Nobles last year on a Shootout day (Total BMW mag). Quite a few of the guys cars were similar to the first figure you mentioned.
Andrew D said:
Power at the wheel as given by a rolling road is different to the power at the crank as quoted in manufacturers literature.
A rolling road will generally give a reading of about 87% of the power at the crank due to friction and inertia of transmission components.
321bhp * 0.87 = 279bhp
The rolling road correct for power at the wheels to give power at crank which is what generally is always quoted. So in your case you've scaled it up twice. 87% is doing very well for a RWD car - seem unlikely to be that good.A rolling road will generally give a reading of about 87% of the power at the crank due to friction and inertia of transmission components.
321bhp * 0.87 = 279bhp
dannylt said:
The rolling road correct for power at the wheels to give power at crank which is what generally is always quoted. So in your case you've scaled it up twice. 87% is doing very well for a RWD car - seem unlikely to be that good.
? Couldn't really decipher what your post meant.
The power at the crank (or flywheel) is the figure quoted by the manufacturer (typically), in the case of the E36 M3 321bhp. The power at the wheels as tested by a rolling road is typically 87% of the power at the crank (i.e. it's a smaller number), which means an E36 M3 will read about 280bhp on a rolling road.
Just sold an 04 plate m3 smg. Had DMS do some work on it and it then produced 373bhp, took it on the rabbit run for the last 3 years (check out their site www.rabbit-run.co.uk its an amazing event)and it did a true gps'd 176mph. I have just bought a V8 Vantage wich is lovely, but not a quick as the M3, I miss it a bit actually.
Craig
Craig
BRoCceRs said:
Its funny you should say that Vixjumper. These engines don't work unless they are 70 degrees or higher - most on rollers will not be at prime operating temp hence the low readings.
Thats my theory anyway and why if you look at Total BMW you'll see some shocking S54 results.
Thats my theory anyway and why if you look at Total BMW you'll see some shocking S54 results.
We always make sure the engine oil is up to temp before running cars, running a car with the oil cold is just asking for trouble. Although it would not suprise me if other places did not.
Its strange, because non M BMW engines make really good power.
The new M5 engine makes the power, although I've yet to do one. (here's hopeing)
When you say shocking, you mean shockingly high.. or low. I don't get Total BMW but would be interested to see the results and comment.
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