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-   -   Turning Circle Comparison (https://www.revscene.net/forums/640324-turning-circle-comparison.html)

falcon 03-17-2011 06:35 PM

Quote:

Originally Posted by 77civic1200 (Post 7349393)
Mostly true. While it does completely depend on the max angle you are getting out of the front wheels, its also true that a fwd vehicle would have a lower max because of the limits of the driveshaft. A rwd vehicle has more potential to have a small turning radius, if the desire was there.

No. Not mostly true. Completely true. Everything you said, comes back to the same thing. The amount of angle the tie rods/steering rack will give to your wheels.

Mancini 03-17-2011 10:15 PM

Quote:

Originally Posted by Berzerker (Post 7348982)
I would think that RWD having to push the car around would make the radius bigger than a FWD that pulls the car tight?

Berz out.

Perhaps if this was a turning circle drifting competition at full steering lock.

Quote:

Originally Posted by falcon (Post 7349318)
You guys are all morons. It has nothing to do with drivetrain and everything to do with how the knuckles are designed and how much "angle'' your front wheels can get when you are at full lock.

This.

hk20000 03-17-2011 10:20 PM

therefore, you can have a much tighter turning radius in a Subaru Impreza than a Lancer Evolution, yet maybe not as much turning radius as a Lancer GTS.

Let's put another 2 very similar shaped cars together: Smart Fortwo and Toyota iQ. iQ will turn inside the Fortwo turning radius, but iQ is FWD the Fortwo is RWD.

Food for thought. So the argument is moot.

underscore 03-17-2011 10:29 PM

this is a stupid question, as stated before turning radius has nothing to do with the drive wheels, unless you're breaking them loose. wheelbase length plays a small role, and the steering angle at full lock would be the most important thing.

Quote:

Originally Posted by dark0821 (Post 7349156)
i rmbr clarkson comparing a SL65 Black to a normal SL350... =.=
the turning radius on the Black was far bigger than SL350...

http://www.youtube.com/watch?v=iXJH2Q9sW_4&hd=1

skip to 6:02 to see what i am talking abt...

The reason why the Black would have a bigger radius is a combonation of things, including the wider tires and lower suspension that require less steering angle in order to avoid rubbing.

Quote:

Originally Posted by Berzerker (Post 7349333)
That's why I said you need 3 cars that are exactly the same only 1 being RWD 1 being FWD and 1 being AWD. Also speed is a huge factor.

Berz out.

why can't I fail you? Drive train is irrelevant here.

77civic1200 03-17-2011 11:04 PM

Quote:

Originally Posted by falcon (Post 7349525)
No. Not mostly true. Completely true.

Bullshit. You said "It has nothing to do with drivetrain" Thats wrong. Its not the major factor, as I explained, but drivetrain can limit the available angles.

mmmk 03-18-2011 12:53 AM

g35 coupe turns a HUGE as circle compared to my friends clk or gf's civic....
so i would have to say it depends on the car

jackal 03-19-2011 03:45 AM

no front axles makes a big difference. i run modded front knucles and get 52deg in the front and the only limiting factor is that i hit the inside frame and tension rods. i can pull a u-turn in 2 standard car lanes.

http://farm5.static.flickr.com/4116/...efa917c0fe.jpg

falcon 03-19-2011 12:57 PM

I can't believe the utter nonsense in this thread.

Berzerker 03-19-2011 01:07 PM

I think my statement is the truest of all and yet it seems people can't understand the basic principles falcon and I are trying to explain.

Steering is angle what makes a car turn. In order for this to be a fair comparison you need 2 identical cars but one being FWD and one being RWD. THEN you have to drive them in a circle. Speed will play a huge factor in the size of the radius though so at nominal speed I would say they are going to be exactly the same. However as speed increases the cohesion of the front tires will be the contributing factor of the overall radius. The faster you go the wider the radius will be. This is where the difference between FWD and RWD would come into play.
Which one allows for better cohesion and retaining a tight circle.

Berz out.

J____ 03-19-2011 05:37 PM

mercs can turn on a dime. My datsun has horrible turning radius, so does my rx lol

Presto 03-19-2011 05:50 PM

Quote:

Originally Posted by Berzerker (Post 7352052)
Steering is angle what makes a car turn. In order for this to be a fair comparison you need 2 identical cars but one being FWD and one being RWD. THEN you have to drive them in a circle. Speed will play a huge factor in the size of the radius though so at nominal speed I would say they are going to be exactly the same. However as speed increases the cohesion of the front tires will be the contributing factor of the overall radius. The faster you go the wider the radius will be. This is where the difference between FWD and RWD would come into play.
Which one allows for better cohesion and retaining a tight circle.

I think that's a skidpad test. Turning radius has nothing to do with lateral Gs.

SpuGen 03-19-2011 06:28 PM

:whistle:
http://en.wikipedia.org/wiki/Ackerma...ering_geometry

noventa 03-19-2011 06:51 PM

thIn my opinion, Falcon said it best. The OP is confusing the audience with his choice of possible answers. If there was another choice, it would read
d)none of the above

Like Falcon said, you would only have to consider the maximum steering angle plus width and length of the wheel base. On paper with this data alone, you should be able to calculate the turning radius of the typical car with a fixed rear axle.

However in real life, you will notice that at full lock, the angle of the tires at full lock will be slightly different. This is because the manufactured is using some variation of th Ackermann steering geometry (look it up). This type of arranging is used in order to solve the problem of the outer wheel having to travel a farther distance when tracing out the turning circle. Knowing this, we can reach a very close approximation of a car's turning radius with the equation

turning circle radius = the width of the wheels divided in 2 plus length of wheelbase divided by SIN of both steering angles divided by 2.

Imagine if you were plotting a cars turning radius on paper using xy coordinates. You would be plotting the XY coordinates of a semi circle in order to determine the distance of X from where it origin. Because you are plotting a single point, you will have to convert your real life data according. That is why to our best approximation, we divide the length and width of the base by 2, and average out the steering angle.

In real life, steering geometry is a usually a derivative of drive train layout. However, ultimately, it is still the steering angle that largely determines how tightly a car can turn. Knowing the drive train configuration is not sufficient information to determine the turning radius of a car.

And really, if it was up to layout, the tank would win hands down!

falcon 03-19-2011 07:54 PM

Finally someone knows what they are talking about.

underscore 03-20-2011 09:53 AM

Quote:

Originally Posted by Berzerker (Post 7352052)
I think my statement is the truest of all and yet it seems people can't understand the basic principles falcon and I are trying to explain.

Steering is angle what makes a car turn. In order for this to be a fair comparison you need 2 identical cars but one being FWD and one being RWD. THEN you have to drive them in a circle. Speed will play a huge factor in the size of the radius though so at nominal speed I would say they are going to be exactly the same. However as speed increases the cohesion of the front tires will be the contributing factor of the overall radius. The faster you go the wider the radius will be. This is where the difference between FWD and RWD would come into play.
Which one allows for better cohesion and retaining a tight circle.

Berz out.

No, you just can't understand that you're talking about the wrong fucking thing.

jstn86 03-20-2011 09:58 AM

the real answer is...

WHO GIVES A SHIT?

if your car has horrible turning radius, then just DEAL WITH IT.

if your car has awesome turning radius, then just turn LIKE A BAWS.

is it really that important to discuss?

bloodmack 03-21-2011 10:27 AM

OP's question was what drive-terrain has the best turning radius, yet we start to talk about why its not the drive terrain. :lol:

Noventa, I gotta ask why did you fail my post if its partially correct?

Falcon, its not that we're morons, its just we post what we know of / think.

This thread is so much fail :P


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