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Last Post 10/13/2004 8:14 PM by  jeyping
Don't trust the butt dyno
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DammitBeavis
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10/13/2004 3:59 PM
    For a while now our WRX has been feeling kinda slow. I know how easy it is to get used to a powerful car and just chalked it up to that.

    I got worried after driving the Talon around for a while. For some reason the Talon -feels- faster than the WRX.

    Since I have Andy's G-Cube stuff on loan I thought I'd compare some acceleration figures. Just pure G-force information.

    I chose to use 3rd gear since it's the closest ratio after taking the final drives into consideration, and there's just a 3mph difference per RPM across the board.

    Talon (1.115 x 4.929)= 5.496
    WRX (1.366 x 3.9)= 5.327

    I started from a 2500ish RPM roll and wound both cars out to 7000 in 3rd.

    The chart below speaks for itself, the scale is in seconds from punching the throttle.

    [IMG]http://www.solo2.org/blogs//images/solo2_org/pc/68/o_accel.JPG[/IMG]

    HOW can the Talon possibly FEEL faster? Except for the talon's accel peak the WRX has twice the acceleration. Now the other strange thing is that the Talon only feels faster from the drivers seat. Stephanie agrees with the chart from a passenger's perspective.

    Seat design? Smoothness of the curve? What gives?
    mugwump
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    10/13/2004 4:33 PM
    well, having driven the talon, it lags really bad, more-so then the last time i drove your WRX, which was awhile ago. The talon felt "e;fast"e; when the boost nailed you to the seat. look at the curves. the WRX accelerates much harder right away and then reaches peak output and stops increasing in acceleration. the talon on the other hand starts accelerating at a much slower rate. i'll bet you don't "e;feel"e; it start pulling hard until 3-4s, whereas the WRX you feel it from the get-go. it would be interesting to compare the g's to rpm.

    oh, and this is proof tha Subaru > mitsubishi :D
    gary
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    10/13/2004 4:34 PM
    Your typical "e;butt dyno"e; estimates are influenced by several sensory factors beyond the pressure you feel on your back under acceleration.

    I'm certain the Talon makes more wind noise, exhaust noise, and intake noise. There's probably more vibration through the chassis and steering wheel. Maybe even more feedback through the gas pedal. I don't know about the suspension on either car but the amount of "e;squat"e; you experience under acceleration can effect your perception of acceleration. Squat can throw off the longitudinal accelerometer too.
    DammitBeavis
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    10/13/2004 4:44 PM
    The Talon has substantially more squat than the WRX. Wouldn't that make the accelerometer read higher for the Talon though?
    Noise wise I'd have to give the trophy to the WRX. That 3"e; exhaust is pretty loud and drowns out most other noises you'd normally hear.
    dolphinmaxx
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    10/13/2004 6:32 PM
    Heck My little car feels way faster than anything else I've ever been in. Of course it's slower than almost everything else I've been in. From the passenger seat it feels way scary. Of course the speedometer only goes to 85 which is the lowest out of anything else I've driven. So that moves jsut about as much distance if not more than the others.
    Prometheus6krpm
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    10/13/2004 6:45 PM
    Drive them side by side on the highway. Tell Steph to punch it and see who wins.
    jeyping
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    10/13/2004 8:14 PM
    How about ride height? Just a couple inches is enough to throw off your sense of speed. I know when I switched from the Cavalier to the Subaru 30mph in the Subaru felt like 40 in the Cavalier. And of course, driving Mom's full-size conversion van often doesn't feel like I'm moving at all...
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