06-21-2014, 09:59 AM | #45 |
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Right, believe this is the most important takeaway here. Which means the power (425 hp) is grossly underrated.
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06-21-2014, 10:21 AM | #47 |
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That's impressive, thanks for that and all the pictures. As I said before, BMW HP numbers are always underrated. I'd love to know exactly what HP and TQ numbers we're really talking about here....
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06-21-2014, 10:31 AM | #49 | |
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06-21-2014, 10:44 AM | #50 |
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Nice info
Thanks for all the great photos and info. Noticed those extended hubs should really help with wheel changes (no hanger required), but will they cause fit problems with some wheels? Did you happen to notice who made the wheels (mfr's. mark on back)? I think E9X 19s were Fuchs or Ronal?
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06-21-2014, 10:49 AM | #51 |
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So F8x has 50HP and 130TQ more to the wheels and weighs 200 lbs less than E9x. That's a serious difference that cannot be ignored no matter what engine is powering it.
What gear was this dyno? |
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06-21-2014, 11:14 AM | #52 | |
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Not sure on wheel manufacturer, didn't see any obvious markings.
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06-21-2014, 11:15 AM | #53 |
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Wow, it took 20mm spacers to get the stock 19s flush? I wonder why BMW chose such high offsets? Seems like it should be rightfully running similar stock offsets to the E9x M3.
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06-21-2014, 11:16 AM | #54 |
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Dynojet produces very high horsepower results. If we believe dynojet, then M5 CP makes 665hp crank and 600 ft/lb torque. I mean how likely is that. BMW underrated M5 by 90 horses and 100 torque? Why is there such huge disparity between MAHA dyno and dynojet?
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06-21-2014, 11:22 AM | #55 |
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Doesn't sound that far fetched to me, especially if you carry the perspective that BMW produced published HP/TQ figures that could be achieved even on the worst day, thus consistency across the line. Imagine if, on a bad day, this car produced no more power than the outgoing car. People would be pissed!
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06-21-2014, 11:30 AM | #56 | ||
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The proper calculation is 340/(1-0.12)=386. I agree that his assumption still seem way off though. On typical inertia dynos, the sum of drivetrain loss, tire loss and inertial impacts are more in the 12%-18% range though. By removing 22hp and then using the lowest "drivetrain loss" number, he is sort of double dipping. And then makes it worse with the wrong math. Last edited by CanAutM3; 06-21-2014 at 11:53 AM.. |
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06-21-2014, 11:46 AM | #57 | |
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My point is more that trying to correct for drivetrain loss doesn't matter and is irrelevent It's more relevent to compare the delta of the two cars on the same dyno. That delta is 50-60 whp and 150 wtq. Big difference |
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06-21-2014, 11:48 AM | #58 |
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I completely agree... huge difference really... especially when the weight is taken into account (whether it is a little lighter or a lot lighter, it is, in fact, lighter). We all know that dynos are difficult tools to measure true HP/torque and they better serve as tools for relative comparisons. The bottom line is the F8X is putting significantly more power to the wheels than the F9X regardless what the total number actually is.
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06-21-2014, 11:49 AM | #59 |
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06-21-2014, 11:51 AM | #60 |
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What part numbers are the spacers? I want to buy them now, so I can do this as my first mod. Not sure if it will be different for an M4.
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06-21-2014, 12:02 PM | #61 | |
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06-21-2014, 12:16 PM | #62 | |
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SAE is also how some car manufacturers officially certify their crank horsepower numbers. I wish everyone would use SAE personally for better apples to apples comparisons, even though dynos are meant to be a tuning tool and aren't ideal for comparison purposes anyway. |
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06-21-2014, 12:17 PM | #63 | ||
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06-21-2014, 01:12 PM | #64 |
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As we knew it would, car needs wheels with different offset or spacers. Looks awesome with the spacers for sure.
Normally aspirated cars, like the E9X M3?
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06-21-2014, 01:37 PM | #65 |
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With at least 20mm to play with this car should be able clear 295s with the proper wheels, spacing and tire profile, right? That would look awesome. I like wide tires
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06-21-2014, 01:41 PM | #66 | |
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I would run at least a 10.5 inch wheel on a 295 though
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