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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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12-15-2011, 09:09 AM | #1 |
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Any publication strap this car on a dyno yet?
Like to see what it puts down to the wheels in the real world. the k20 in the Si is pretty underrated putting down 180whp, like to see what this new engine does.
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12-15-2011, 09:44 AM | #2 |
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Nothing released or has been posted
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12-15-2011, 10:47 AM | #3 |
This will have much higher drive train loss then the FWD K series. I would expect around 160ish wheel horsepower. But we will not know for sure until we see the same car in the same conditions run on a Mustang or Dyno Dynamics, etc. Inertial numbers are pretty much bunk.
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12-15-2011, 11:08 AM | #4 | |
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12-15-2011, 11:32 AM | #5 |
25% drive train loss would be 150hp. My quote was "160ish" wheel horsepower; my estimate, not fact. The "160ish" hp number could be between 16% and 20% drive train loss, and a completely reasonable estimate. For the nit picker or mathematically challenged that could be anywhere between 160whp and 169whp. Thanks for playing.
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12-15-2011, 01:29 PM | #6 |
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Maybe its underrated from the factory and the 200 will be to the wheels........sigh....we can hope I guess
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12-15-2011, 01:39 PM | #7 |
12-15-2011, 02:35 PM | #8 |
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Stock 2011+ Mustang GT puts down 375WHP, that's 10% drivetrain loss...
[u2b]ciAu8OlrFNI[/u2b] [u2b]jqD2LnVLZxk[/u2b] Before anyone replies with, "Well that's a v8!" I understand this, I'm just pointing out that sometimes horsepower is underrated. |
12-15-2011, 02:58 PM | #9 |
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the 5.0 is underrated.
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12-15-2011, 03:33 PM | #10 |
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All the media coverage so far has been under the supervision of Toyota/Scion/Subaru at racetracks. As far as we know, nobody's been able to take one out in the wild...and to a known-quantity chassis dyno.
We'll see in time what the FA20 puts down. With any luck the people doing the dyno are smart enough to post a known quantity and have reasonable datalogging to see operational conditions.
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12-15-2011, 03:33 PM | #11 |
This, also one must take in to consideration calibration, inertial vs eddy current, SAE corrected or uncorrected, wheel diameter, drag compensation, etc. The dyno really only tells you what you are making on a given day, with your particular car on that particular dyno. I was a dyno operator/tuner for 5 years of my life.
Last edited by mines13; 12-15-2011 at 03:44 PM. |
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12-15-2011, 04:28 PM | #12 | |
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12-15-2011, 04:31 PM | #13 |
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i wonder if the solid rear axle can reduce drivetrain losses. i think most of the losses from rwd comes from the fact that you have to deflect the energy if you keep the wheels on the same plane as the diff there would be less total deflection...anybody know?
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12-15-2011, 07:12 PM | #14 |
There are so many factors there. The short answer is may or may not. depending on the size of the pumpkin, the mass of the axles, the mass of the hub/wheel/tire/brake rotor/CVs, etc. Hell, even the viscosity of the differential fluid would effect drive line loss post transmission... This is all ignoring the transmission/engine itself. I do not think there is a simple answer to that, apples to oranges.
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