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02-07-2014, 11:29 AM | #133 | |
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BMW rates the stock M3 at 414bhp @ 8,300rpm and 295lb-ft of torque at 3,900rpm -which is in line with the MotoIQ car and most stock dynographs on the database. I'm not familiar with the DashDyno unit but it looks pretty cool, however Dynojet 224xLCs are pretty repeatable and Roush Yates knows what they are doing operating it. |
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02-07-2014, 03:16 PM | #135 |
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Interesting question. Every dyno I’ve seen on here where datalogging is enabled, I’ve seen timing retarded by 6-8 degrees and rising test and ambient temps and fuel running rich. Log on a flat open road with cool air hitting the intake and radiator and timing retarded by 1-4 degrees on 91 octane and IATs are declining as rpm and speed increase and AFRs are perfect. At a 12:1 compression ratio, would think that proper cooling, fresh air, heat exchange to be critical to power generation. Guys like Dinan and Rototest try to control all those factors with a true wind-tunnel or in Dinan’s case a simulated wind tunnel effect with their special device.
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02-07-2014, 04:25 PM | #136 | |
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M3's, ISF, and the 5.0 Mustang are all rated at ~414-420bhp and dyno differently at the wheels: 5.0 Mustang: 360-370whp. = min of 11.9% drivetrain loss ISF: 330-345whp = min of 16.9% drivetrain loss M3: 330-340whp = min of 17.9% drivetrain loss You could say the Mustang is under-rated from the factory, the ISF has a power-sapping (locking torque converter) automatic transmission, and the M3 is over-rated from the factory. With proper dyno procedures and fans to keep the AITs and coolant temps in check, you can get pretty repeatable and accurate numbers under 'laboratory' conditions. Real world power could vary from car to car depending on the air inlet design (for ram-effect and location of air pickup for varying air temps) to actually make more power than what's made on a dyno. |
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02-07-2014, 04:58 PM | #137 | ||
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Just my 2 pennies.
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02-07-2014, 05:27 PM | #138 | |
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And those are avg numbers across the board on the same type of dyno but I agree it's a slipperly slope (but its hard to argue that the M3 does make some pretty low #s to the tire when compared to its peers). |
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02-07-2014, 08:33 PM | #139 |
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Kind of sucks. Although side by side M3 faster than both so I guess the formula at end of day works
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02-08-2014, 07:36 AM | #140 |
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Better gearing and better aerodynamics. Although im not sure, a mustang might be faster with 3.73 or 4.11s -to a point where aero will start to hurt it again. Same with Mercedes.
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