911s: What are the advantages of a RR layout over FR or MR ?

bartboy9891 said:
Blind_Io said:
Svempa said:
RR engine layout is also good for braking performance.

Oh really?

http://img247.imageshack.**/img247/2567/corvairtm0.jpg

*whistles smugly* 8)
i see your corvair and raise you a Tatra T87 that had a V8 in the rear

http://img226.imageshack.**/img226/1007/1948t873zq6.jpg

Yes. When braking, weight shifts to the front axle as we all know. That's why the front brakes are bigger on most cars, they do most of the braking. But if you don't have a big heavy engine over the front-axle braking is improved.
 
Ideally yes, but what about a brake and swerve? That's a much more common scenario on the road and in those cases the car spins much more easily than a front engine car.
 
Blind_Io said:
Ideally yes, but what about a brake and swerve? That's a much more common scenario on the road and in those cases the car spins much more easily than a front engine car.
Surely, but in the threadstarter wanted to know about the advantages
 
The end with more weight on it changes direction more slowly, but carries its momentum longer. Put a big engine in the front and you'll be jumping curbs and mowing grass, but with the engine in the back, you can tip the front in easily and hold the back out under power as long as you want. Just don't give it too much power or you'll pirouette the thing.

Try putting four cases of Coke in the back of a shopping cart, and run it around corners. Then put them in the middle, and then the front. Just don't get kicked out of the store.

As for brake and swerve, the weight may come off the rear wheels and lose some grip, but the weight is still there. Without the grip, the back end wants to go in a straight line, but if the front tires stick ... you pirouette. Or at least fishtail like a lunatic.
 
Nice Tucker Blind!

Anyone that thinks the advantages outweigh the drawbacks of a RR has never taken an aircooled 911 through a decreasing radius corner at speed.
 
switch that, it's exit > entry because your exit speed is greatly influencing on your next corner.
No, the corner entrance is the most important part of driving around a racetrack quickly. Your entrance point dictates your apex point and exit point. Turn in too soon and you'll go off, too late and you'll be slow on the straight.
 
No, the corner entrance is the most important part of driving around a racetrack quickly. Your entrance point dictates your apex point and exit point. Turn in too soon and you'll go off, too late and you'll be slow on the straight.

Exit SPEED not exit "point". Your entry lasts for a fraction of time, your exit influences whole straight ahead.

Slower speed at exit means you'll be slower at every point of the straight, and the gap will grow.

Slower entry speed means you'll be slower for a moment, if exit speed remains the same.

So if it's a tradeoff between entry and exit (sometimes it is), exit always wins.
 
Exit SPEED not exit "point". Your entry lasts for a fraction of time, your exit influences whole straight ahead.

Slower speed at exit means you'll be slower at every point of the straight, and the gap will grow.

Slower entry speed means you'll be slower for a moment, if exit speed remains the same.

So if it's a tradeoff between entry and exit (sometimes it is), exit always wins.
Yeah, I know. But the saying goes "Slow in to be fast out." 1mph more exit speed can translate to 15 more mph at the end of the straight, but in order to gain that speed you have to have a good entrance. Exit speed is entirely dependant on corner entry.
 
I dont think its too confusing, but in gereral MXM and Vitamin J have basically the same point! :razz:
 
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