06-11-2014, 02:56 PM | #45 |
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Ok, this has been extremely helpful. So here's how I'm interpreting this now:
1. This dyno is super legit and the next best thing to a real engine dyno done under strict standards. 2. I am totally unequipped to understand and compare this dyno to any sort of normal dyno I'm used to seeing (i.e. dynojet). 3. Once past 3200 rpms on this dyno, we are seeing a pretty reliable torque and HP curve. However, I don' tknow how the numbers truly compare to what I'm used too. |
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06-11-2014, 02:56 PM | #46 | |
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06-11-2014, 02:58 PM | #47 |
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If true, we are over 150hp/L (155, even) putting it in rare company and reaching the target so many doubted when the I6 engine speculation began years ago.
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06-11-2014, 03:00 PM | #48 |
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06-11-2014, 03:12 PM | #49 | |
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06-11-2014, 03:14 PM | #50 |
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Mercedes CLA-45 AMG
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06-11-2014, 03:19 PM | #51 |
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Mercedes 2.0 liter in the CLA AMG, Subaru and Mitsubishi have made 2.0 liters putting out around 150 hp/liter for quite awhile....probably a few others. By no means common, but also not a new achievement in forced induction in terms of specific output either.
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06-11-2014, 03:20 PM | #52 |
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The Ferrari F40 just make a hint more hp from a hint less displacement ( 478 PS from 2,936 liter ). Pretty fat that the S55 is that close to the both famous and infamous F40, now if they could just offer this engine in a 2400 lb car, welcome back F40
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06-11-2014, 03:26 PM | #53 | |
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06-11-2014, 03:29 PM | #55 |
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I think if you look at the price and all else included... the S2K will win the hp/L argument every time. It's an NA 4 banger that made 120 hp per.
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06-11-2014, 03:30 PM | #56 |
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Unless I am not seeing something... looking at the WHP graph; wouldn't that still be below 7K rpm?
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06-11-2014, 03:35 PM | #57 | |
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However, I don't know what to think about those WHP and LossHP lines on the chart. 30% loss at max RPM does not add up. There must be something else involved. |
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06-11-2014, 03:37 PM | #58 |
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I agree, something doesn't add up. But... if the whp curve is right; then there is a sharp drop in power very early on, much earlier than previously ever shown which is dead on with my expectations. We have no idea how the flywheel numbers r calculated either.
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06-11-2014, 03:42 PM | #59 | |
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An efficient RWD platform on a traditional roller dyno is expected to lose ~12% between engine and wheels. Here we have double that as an actual observed loss? To me that margin of difference means we are looking at loss in two different ways. |
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06-11-2014, 03:42 PM | #60 | |
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In reality, you either have wheel torque that is multiplied by the gear ratio and final drive minus the drivetrain losses, or you have flywheel torque without drivetrain losses. My guess on the Sport Auto chart is that WHP and "losses" whatever that is are measured. Adding both gives flywheel power and dividing flywheel power by RPM gives flywheel torque. Last edited by CanAutM3; 06-11-2014 at 03:47 PM.. |
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06-11-2014, 03:43 PM | #61 | |
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06-11-2014, 03:45 PM | #62 | |
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FlywheelHP = WHP + Losses (P-Mot = P-Rad + PSchlepp) |
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06-11-2014, 03:46 PM | #63 |
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06-11-2014, 03:47 PM | #64 |
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Why are losses different across the top part of the curve? That makes no sense. The WHP drops, yet the flywheel remains the same even though it's a higher rpm.
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06-11-2014, 03:51 PM | #65 |
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It does seem from the whp chart that power drops pretty significantly after 6k rpm. It does look enough to create a feel of running out of breath ( I did not say jerk ) even if maximum acceleration might be with shifts at 7k rpm. This make me continue to believe that significant short shifting is the most pleasurable way to drive this thing.
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06-11-2014, 03:53 PM | #66 | |
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I think the only numbers that we can really look at to compare anything are the flywheel power and torque numbers. |
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