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04-02-2012, 02:39 PM | #1 |
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ASSISTANCE with reading Dyno my results (european)...
Im in Italy and i took my car to get dyno'd today. I had a very difficult time understanding this guy, he spoke italian, but i figured that the print out could explain itself...
I did understand that there was problem with there machine reading the torque/rpm #, but he said that the power output is accurate. could someone dumb this down for me? thanks
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04-02-2012, 05:55 PM | #2 |
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OMG. I have never attended a dyno run but even I can tell that there were at least two things that went wrong:
1. The torque figures are obviously wrong since the RPM was miscalculated as you can see from the slip. 2. The power figures are meaningless because shortly before max RPM was reached, power was reduced because of overheating. You can see this at 1:39 in the video. The coolant sign came on and max RPM was reduced to ~7000 by the safety cutoff. During this run, maximum power was never reached. Did the guy miss to install the neccessary air duct for cooling? I can only see the open hood. Get your money back. That dyno run did nothing but put stress on your engine.
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04-02-2012, 07:02 PM | #4 |
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I translated it for you:
Nominal power - 302kw Engine power at crank - 271.5kw Engine power at wheels - 224.5kw Engine power lost to friction - 47 kw Hope this helps.
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04-02-2012, 07:33 PM | #5 | ||
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He had the hood raised and the floor fan turned on and nothing more. Was there suppose to be something else for cooling? One thing that raised my attention was these numbers. It looks like the most the car is capable is 364hp. Even tho we did not reach maximum power, 364 is still WAY OFF from 414-420ph which is advertised on a stock M3 correct? My car has been tuned, which is telling me that at stock, my car produced even less than advertised....right? I highly doubt getting the money back is possible at this point...This was a mere learning experience if anything for me. But now i kinda understand more with talking with you guys here on the post, and doing further research. Quote:
I did take note on how it was hooked up tho...the only cables that was hooked up where a positive and negative terminal under the hood. I questioned that and he explained that the machine somehow reads the thru the battery of the car??? I was like..."ok" I imagined something would be hooked to the OBDII link or something... thanks man. that helps
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04-02-2012, 11:56 PM | #6 |
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I would take these numbers with a grain of salt. There's just too many issues with this dyno session. Why is the dash lit up like a Christmas tree? Why'd it over heat? What gear was he in? The RPM issue. Etc.
I was wrong. Your car only made 300 WHP which is 364 BHP (roughly). He didn't quite make it to peak power but it shouldn't be ~60 WHP low. |
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04-03-2012, 01:05 AM | #7 | ||
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Cooling is the critical factor for measuring a car's power. You would have to reach an airflow of about 120mph in order to simulate the car operating on the street. With our M3, the air intake is through the vent on driver side of the hood which normally separates the hot engine bay from the cold outside air. With the hood open an inadequate cooling, the engine sucks in hot air from the engine bay, much like with so-called "cold" air intakes. It would be better to use an air duct for the intake with a stationary car (like this). Quote:
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04-03-2012, 04:13 PM | #9 | ||
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What should be the power output at 7500 RPM? This way i can kinda see how much it was off if any. Or could it be safe to say that it was accurate up until 7500 RPM?
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04-03-2012, 06:31 PM | #10 | |
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Regardless, from looking at some other stock dyno plots, it looks like they make about 350 WHP at 7500 RPM. Power seems to pretty much level off in that area of the curve. So like I said before, he didn't quite make it to peak power but it should be much closer and not 50-60 WHP low. I don't know what the gearing of the DCT is but he may have used the wrong gear which could produce this discrepancy. There's just too many unknowns here. NOTHING about this dyno session is correct from what I can tell. I'd have it done again and consider these results garbage. |
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04-03-2012, 07:05 PM | #11 | |
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04-04-2012, 01:36 AM | #12 | |
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Nearly all results from a dyno run (power, torque, gear losses) are calculated from the exerted force at the wheel and via known parameters like wheel diameter, gearing and so on. From the fact that torque was wrong, we can assume that gearing was miscalculated. Thus, losses are incorrect. The exact RPMs at which maximum power is reached can be anywhere between 7500 and 8600, especially with a tune, so you can tell almost nothing from this run apart from: "power at the wheels was no less than ..." and even that I believe only because it's an M3.
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