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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 12-15-2011, 10:09 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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Old 12-15-2011, 10:44 AM   #2
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Nothing released or has been posted
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Old 12-15-2011, 11:47 AM   #3
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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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Old 12-15-2011, 12:08 PM   #4
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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.
This is not an AWD car. There will not be 25% loss.
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Old 12-15-2011, 12:32 PM   #5
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This is not an AWD car. There will not be 25% loss.
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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Old 12-15-2011, 02:29 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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Old 12-15-2011, 02:39 PM   #7
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Maybe its underrated from the factory and the 200 will be to the wheels........sigh....we can hope I guess
I would not get my hopes up, would be nice though.
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Old 12-15-2011, 03:35 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.
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Old 12-15-2011, 03:58 PM   #9
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the 5.0 is underrated.
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Old 12-15-2011, 04:33 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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Old 12-15-2011, 04:33 PM   #11
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the 5.0 is underrated.
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.

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Old 12-15-2011, 05:28 PM   #12
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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.
for the nitpicker or mathematically challenged i would think that 160ish would be more like 155-165 but seriously i can the upper 160s being most probable
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Old 12-15-2011, 05:31 PM   #13
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Quote:
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Stock 2011+ Mustang GT puts down 375WHP, that's 10% drivetrain loss...

Before anyone replies with, "Well that's a v8!" I understand this, I'm just pointing out that sometimes horsepower is underrated.
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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Old 12-15-2011, 08:12 PM   #14
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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?
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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