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The 911 is quicker because it has more power. It doesn't handle as well as a Boxster, because the 911 has all the weight in the rear. Good for acceleration, but bad for everything else. Moving weight to the rear of the Boxster would make it handle like a 911, which is bad. The Boxster handles better because of the weight distribution that the mid-engine layout gives you. To the OP, relocating your battery would be one of the last things you should worry about. Yes, the battery is located high in the car, but it is still a lot lower than in most cars, because the Boxster is a low car. For street driving, you'd probably never notice the change if you moved the battery to the floor of the trunk. |
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Polar moment of inertia is the point where the vehicle seems to rotate on an axis. |
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As far as weight dist. , around 55% rear (like the Boxster) is generally considered ideal, 60% rear like the 911 is too much, and can lead to quirky handling issues. This is assuming there's no odd rules in place regarding staggered tire sizes. |
Keep the battery where it is and put in an electric power steering pump in the lower trunk. Cuts even more weight and eliminates the problematic PS pump on the engine. Win-Win
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Stephan Wilson's explanation is spot on - a car with a lower PMOI will rotate easily and quickly which is why it takes quick hands on the wheel to avoid a spin in a Boxster. Driving a 911 takes a completely different driving technique to manage the higher PMOI (slower but much larger wheel corrections to avoid a spin). Here is a video showing how quickly I had to move my hands to avoid a spin at Laguna Seca... <iframe width="560" height="315" src="https://www.youtube.com/embed/BtJiBHyA7bY" frameborder="0" gesture="media" allow="encrypted-media" allowfullscreen></iframe> Quote:
The secret to fast driving is managing the balance of the car to move the weight of the car to the location (front or rear) where it will provide the most benefit at any given moment without creating a condition where the reduction in grip in another location induces handling issues. Boxster's are generally evenly weighted (front to rear) so its fairly straight forward to manage the balance of the car for maximum grip. For example, braking during corner entry puts weight on the front tires which increases the front grip for good corner turn in and reducing understeer. Then transitioning from brake to throttle at mid-corner allows for weight transfer to the rear to get good grip and build speed on corner exit. There are also other techniques that can be used in the Boxster to get though corners fast but this is the basic approach. Conversely, a 911 has an inherent rear weight bias, so braking to get weight on the front of the car so it turns in properly is key but the rear weight bias allows for early and substantial use of the throttle in the middle and exit phases of the corner without inducing oversteer. So a 911 typically enters corners slower but can be fast though the middle of the corner and blasts out of corners with all of that weight on the rear wheels. But at the end of the day, balance wins out. For equal power and tires, the mid-engine layout will typically produce faster corners than a rear engine layout which is why the latest Porsche 911RSR is a mid-engine design. Why the Porsche 911 RSR Had to Go Mid-Engine Quote:
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Talk about fast hands... check out this 914, similar weight distribution, on ice...
https://youtu.be/Zcgu4xedAjs |
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