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Location:
Terrigal
Registered:
May 2002
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Re: Roll centre adjusters? RA28
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Mon, 21 June 2004 11:22
 
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Howdy, been looking at this thread but unsure where to start...
I guess with the easy stuff 
Every MM you lower the front of the car ultimately should be made up with the use of RCAs. So if you lower it 20mm, put a 20mm RCA in.
The roll centre ... If you look at a car while going through a corner the body of the car is not horizontal to the road (duh). The roll centre basically is the point where the car rotates. This place usually is an imaginary space.
The instantaneous centre ... When the wheel goes through the suspension travel, bump or droop, there is a point in which the wheel rotated. There is a centre in which the wheel will rotate, this is the instantaneous centre.
On RA28's (MacPherson strut), to find the instananeous centre ... this is where it gets confusing.
You draw a line through the pivot at the top of the strut at 90 degrees to the strut centreline. Then draw a line that follows the angle of the control arm. These 2 lines will intersect at some point. Where these arms intersect is the instaneous centre mentioned above..
Now the actually effect of all this.. Well one very apparent thing is bump steer. When designing a steering system the steering arm actually needs to follow a line from the instantaneous centre to the outer tie rod end.
Reading the above, you should be able to see that lowering a car, and altering the angle of the control arm, changes the instantaneous centre. So this ultimately changes the position of where the steering arms need to be. But we all know when you lower a car the rack/drag link/whatever, will not change hence no longer follows the correct angles.
Hmm well thats probably confused you enough..
Let me know if you dont understand though and what exactly and i'll see if I can explain..
I learnt way too much about all this when converting to rack n pinion steering in the Celica.
Cheers
Joel
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| | Subject | Poster | Date |
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Roll centre adjusters? RA28
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blackRA28 | Sun, 20 June 2004 13:56 |
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Re: Roll centre adjusters? RA28
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rxtoy | Mon, 21 June 2004 10:03 |
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Re: Roll centre adjusters? RA28
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Brenton_TA23 | Mon, 21 June 2004 10:40 |
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Re: Roll centre adjusters? RA28
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TurboRA28 | Mon, 21 June 2004 11:22 |
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Re: Roll centre adjusters? RA28
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Simon-AE86 | Mon, 21 June 2004 11:24 |
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Re: Roll centre adjusters? RA28
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Simon-AE86 | Mon, 21 June 2004 11:25 |
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Re: Roll centre adjusters? RA28
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TurboRA28 | Mon, 21 June 2004 11:33 |
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Re: Roll centre adjusters? RA28
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blackRA28 | Tue, 22 June 2004 13:19 |
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Re: Roll centre adjusters? RA28
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TurboRA28 | Tue, 22 June 2004 23:11 |
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Re: Roll centre adjusters? RA28
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blackRA28 | Thu, 24 June 2004 02:36 |
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Re: Roll centre adjusters? RA28
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TurboRA28 | Thu, 24 June 2004 06:03 |
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Re: Roll centre adjusters? RA28
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st184 sillycar | Thu, 24 June 2004 08:23 |
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Re: Roll centre adjusters? RA28
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willwal98 | Wed, 23 March 2005 12:29 |
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Re: Roll centre adjusters? RA28
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TurboRA28 | Wed, 23 March 2005 22:46 |
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Re: Roll centre adjusters? RA28
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Lachie | Thu, 24 March 2005 01:18 |
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Re: Roll centre adjusters? RA28
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TurboRA28 | Thu, 24 March 2005 01:32 |
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Re: Roll centre adjusters? RA28
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blackRA28 | Thu, 24 March 2005 13:00 |
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Re: Roll centre adjusters? RA28
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TA-022 | Sat, 28 May 2005 01:52 |
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Re: Roll centre adjusters? RA28
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Stefan | Sat, 28 May 2005 02:23 |
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Re: Roll centre adjusters? RA28
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TA-022 | Sat, 28 May 2005 02:43 |
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Re: Roll centre adjusters? RA28
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blackRA28 | Sat, 28 May 2005 03:25 |
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Re: Roll centre adjusters? RA28
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willwal98 | Tue, 31 May 2005 20:24 |
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Re: Roll centre adjusters? RA28
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ra_28 | Tue, 31 May 2005 21:44 |
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Re: Roll centre adjusters? RA28
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Stefan | Wed, 01 June 2005 00:40 |
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Re: Roll centre adjusters? RA28
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HyDrA | Wed, 01 June 2005 00:47 |
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Re: Roll centre adjusters? RA28
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Stefan | Wed, 01 June 2005 06:41 |
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Re: Roll centre adjusters? RA28
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blackRA28 | Wed, 01 June 2005 02:25 |
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Re: Roll centre adjusters? RA28
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TurboRA28 | Wed, 01 June 2005 07:11 |
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Re: Roll centre adjusters? RA28
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willwal98 | Sat, 15 October 2005 23:39 |
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Re: Roll centre adjusters? RA28
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RobertoX | Sun, 16 October 2005 02:59 |
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Re: Roll centre adjusters? RA28
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willwal98 | Sun, 16 October 2005 06:03 |
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Re: Roll centre adjusters? RA28
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tanman | Sun, 16 October 2005 07:26 |
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Re: Roll centre adjusters? RA28
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willwal98 | Sun, 16 October 2005 07:44 |
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Re: Roll centre adjusters? RA28
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yrhkira | Mon, 17 October 2005 01:14 |
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Re: Roll centre adjusters? RA28
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willwal98 | Mon, 17 October 2005 01:54 |
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Re: Roll centre adjusters? RA28
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TA-022 | Mon, 17 October 2005 08:22 |
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Re: Roll centre adjusters? RA28
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willwal98 | Mon, 17 October 2005 08:37 |
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Re: Roll centre adjusters? RA28
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willwal98 | Tue, 25 October 2005 13:17 |
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Re: Roll centre adjusters? RA28
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Chriph | Tue, 25 October 2005 23:55 |
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Re: Roll centre adjusters? RA28
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RobertoX | Wed, 26 October 2005 09:02 |
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Re: Roll centre adjusters? RA28
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willwal98 | Wed, 26 October 2005 13:34 |
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Re: Roll centre adjusters? RA28
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Gabriel Tyler | Wed, 26 October 2005 17:13 |
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Re: Roll centre adjusters? RA28
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Stefan | Thu, 27 October 2005 00:05 |
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Re: Roll centre adjusters? RA28
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Gabriel Tyler | Thu, 27 October 2005 00:42 |
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Re: Roll centre adjusters? RA28
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Stefan | Thu, 27 October 2005 01:00 |
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Re: Roll centre adjusters? RA28
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Stefan | Thu, 27 October 2005 01:05 |
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Re: Roll centre adjusters? RA28
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Gabriel Tyler | Thu, 27 October 2005 01:10 |
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Re: Roll centre adjusters? RA28
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Stefan | Thu, 27 October 2005 01:21 |
