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Location:
South Australia
Registered:
July 2002
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Re: MA70 dyno and power curve - weiird!
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Tue, 07 September 2004 01:59
 
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wouldnt it equate to: 115.2 x 1.34 = 154.4kw x 1.34 = 206.8hp = std 7mge power.
thats equating for 1/3 drivetrain loss, which probly isnt out of reach for a heavy assed A340E
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Short answer - no. If you are getting "1/3" drivetrain loss, then your 115.2kW figure would equate to 2/3 of what you would expect to have...thus your figure at the flywheel would be 3/2 of 115.2kW -> 172kW (or thereabouts, using head here)
Having said that, there is no way you can figure out what the actual flywheel kW is from a dyno figure, there are too many factors...in all honesty, if you really were getting 115kW at the wheels, you could be getting anywhere between 155 and 190kW at the flywheel 'depending'.
Lastly, lets say you are gaining 30kW at the wheels in the last little bit of revs like on that graph...that means that at the flywheel (due to your '1/3' losses rule) you are gaining 45kW over that period. Lets roughly say that it occurs over a 500rpm (at the fly) delta.
First convert 45kW to 45000W - then convert 500rpm into 52.36rad/sec
so you get a torque at the crank of (45000/52.3) Nm = 859Nm...AT THE CRANK...
THIS IS CALLED 'BOLLOCKS'. Do you want me to add up the uncertainty in that figure as well, just to prove that there is no way that dyno graph is accurate? Cause I can if you like, but it's going to waste 5 minutes of my life 
Trust me, that graph is wrong...even if your car did suddenly 'open up' -> to get 800ish Nm of torque is an EXTREME change of air flow...I mean, like "adding another 6 cylinders" kind of change in flow.
What is happening here is there is a change in the torque multiplier between the engine and the wheels -> ie gear change.
Or the dyno suddenly broke
Or my maths is wrong Which is kinda likely...feel free to correct me afficionados.
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| | Subject | Poster | Date |
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MA70 dyno and power curve - weiird!
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V8_MA61 | Mon, 06 September 2004 13:37 |
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Re: MA70 dyno and power curve - weiird!
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Skip | Mon, 06 September 2004 13:41 |
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Re: MA70 dyno and power curve - weiird!
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Siktoy ra23 | Mon, 06 September 2004 13:41 |
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Re: MA70 dyno and power curve - weiird!
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V8_MA61 | Mon, 06 September 2004 13:42 |
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Re: MA70 dyno and power curve - weiird!
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justcallmefrank | Mon, 06 September 2004 13:44 |
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Re: MA70 dyno and power curve - weiird!
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Skip | Mon, 06 September 2004 13:45 |
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Re: MA70 dyno and power curve - weiird!
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justcallmefrank | Mon, 06 September 2004 13:47 |
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Re: MA70 dyno and power curve - weiird!
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CrUZsida | Mon, 06 September 2004 13:49 |
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Re: MA70 dyno and power curve - weiird!
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V8_MA61 | Mon, 06 September 2004 13:49 |
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Re: MA70 dyno and power curve - weiird!
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justcallmefrank | Mon, 06 September 2004 13:51 |
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Re: MA70 dyno and power curve - weiird!
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V8_MA61 | Mon, 06 September 2004 13:53 |
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Re: MA70 dyno and power curve - weiird!
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thechuckster | Mon, 06 September 2004 14:16 |
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Re: MA70 dyno and power curve - weiird!
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CrUZsida | Mon, 06 September 2004 14:25 |
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Re: MA70 dyno and power curve - weiird!
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V8_MA61 | Mon, 06 September 2004 14:21 |
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Re: MA70 dyno and power curve - weiird!
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V8_MA61 | Mon, 06 September 2004 14:23 |
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Re: MA70 dyno and power curve - weiird!
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thechuckster | Mon, 06 September 2004 14:26 |
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Re: MA70 dyno and power curve - weiird!
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justcallmefrank | Mon, 06 September 2004 14:23 |
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Re: MA70 dyno and power curve - weiird!
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V8_MA61 | Mon, 06 September 2004 14:30 |
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Re: MA70 dyno and power curve - weiird!
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Allan | Mon, 06 September 2004 14:49 |
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Re: MA70 dyno and power curve - weiird!
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CrUZsida | Mon, 06 September 2004 14:50 |
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Re: MA70 dyno and power curve - weiird!
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V8_MA61 | Mon, 06 September 2004 14:54 |
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Re: MA70 dyno and power curve - weiird!
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rob_RA40 | Tue, 07 September 2004 04:46 |
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Re: MA70 dyno and power curve - weiird!
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V8_MA61 | Mon, 06 September 2004 15:10 |
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Re: MA70 dyno and power curve - weiird!
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CrUZsida | Mon, 06 September 2004 15:26 |
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Re: MA70 dyno and power curve - weiird!
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M.W.P. | Mon, 06 September 2004 15:29 |
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Re: MA70 dyno and power curve - weiird!
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V8_MA61 | Mon, 06 September 2004 15:49 |
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Re: MA70 dyno and power curve - weiird!
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gianttomato | Mon, 06 September 2004 22:19 |
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Re: MA70 dyno and power curve - weiird!
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RWDboy | Tue, 07 September 2004 00:31 |
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Re: MA70 dyno and power curve - weiird!
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V8_MA61 | Tue, 07 September 2004 01:15 |
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Re: MA70 dyno and power curve - weiird!
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justcallmefrank | Tue, 07 September 2004 01:17 |
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Re: MA70 dyno and power curve - weiird!
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V8_MA61 | Tue, 07 September 2004 01:20 |
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Re: MA70 dyno and power curve - weiird!
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ed_ma61 | Tue, 07 September 2004 04:11 |
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Re: MA70 dyno and power curve - weiird!
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Skip | Tue, 07 September 2004 04:49 |
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Re: MA70 dyno and power curve - weiird!
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justcallmefrank | Tue, 07 September 2004 01:23 |
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Re: MA70 dyno and power curve - weiird!
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Norbie | Tue, 07 September 2004 01:23 |
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Re: MA70 dyno and power curve - weiird!
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V8_MA61 | Tue, 07 September 2004 01:28 |
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Re: MA70 dyno and power curve - weiird!
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RWDboy | Tue, 07 September 2004 01:59 |
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Re: MA70 dyno and power curve - weiird!
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CrUZsida | Tue, 07 September 2004 02:10 |
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Re: MA70 dyno and power curve - weiird!
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jase | Tue, 07 September 2004 02:17 |
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Re: MA70 dyno and power curve - weiird!
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RWDboy | Tue, 07 September 2004 02:05 |
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Re: MA70 dyno and power curve - weiird!
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V8_MA61 | Tue, 07 September 2004 02:19 |
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Re: MA70 dyno and power curve - weiird!
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Norbie | Tue, 07 September 2004 03:52 |
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Re: MA70 dyno and power curve - weiird!
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justcallmefrank | Tue, 07 September 2004 04:00 |
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Re: MA70 dyno and power curve - weiird!
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RWDboy | Tue, 07 September 2004 05:03 |
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Re: MA70 dyno and power curve - weiird!
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wilbo666 | Wed, 08 September 2004 13:08 |
