| Author | Topic |
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Location:
Tasmania
Registered:
May 2002
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Re: removing Ackerman Steering
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Sun, 08 September 2002 17:17
 
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Previosly, I had modifyed my steering knuckles for true ackerman, and I also
shortened them for quicker steering. This worked good, but the minimum
turning circle was a bit large. Performance was good.
OK, I cut my knuckles again and welded them up for parallel steering, no
ackerman! Since this is a road going old corolla, not a fully adjustable
race car, some aspects are a bit crude. I worked out the bump steer as much
as I could,but its not perfect. The only testing I have done is on wet
roads with poor tyres, and some gravel rally work.
To my surprise, the steering is alot slower, lighter, and more turns lock to
lock. Now about 3-1/4 turns from 2-5/8 turns before, and this is with the
same length knuckles! How does that work you say? Play with a model and
you will see.
Due to the outside wheel getting more turn, I can now do u-turns in no space
at all. Great!
Performance: The steering is too slow for me. This is not due to poor grip,
just the slower geometry. Road holding is still there I think. Maybe it
does understeer a bit more, but I had poor conditions. The steering feels
more constant ratio. With ackerman, it seams to quicken up at either
extream.
Conclusion: If you are designing a car, no ackerman is ok I guess. Bear in
mind a quicker steering box or rack will be needed than if you where to have
ackerman angles (or shorter knuckles). Wether ackerman angles improve grip
or not I'm not sure, there are lots of other things effected that are more
important to me.
Increasing the ackerman angles to true ackerman or beyond will quicken the
effective steering ratio, but increase your minimum turning circle.
Decreasing ackerman angles to near zero or negative, will slowen the
effective steering ratio, but decrease the minimum turning circle.
Note: When changing the angle of the steering knuckle for different ackerman
effects, you will end up adjusting the steering tie-rod to suit, which
effects bump steer.
I am going to change it again, back close to factory specs. I will have
less ackerman than factory, but not zero. This is mainly for turning circle
issues. Also, I will keep the knuckles short for quick steering, and to
counter the slow effect of reducing the ackerman angle.
OK, so zero ackerman may be great for rally, but you need much shorter knuckles and/or quicker steering rack/box to suit.
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| | Subject | Poster | Date |
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removing Ackerman Steering
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5KinKP60 | Sat, 31 August 2002 00:07 |
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Re: removing Ackerman Steering
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jazae86 | Sun, 01 September 2002 05:54 |
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Re: removing Ackerman Steering
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justcallmefrank | Sun, 01 September 2002 06:33 |
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Re: removing Ackerman Steering
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Bill Sherwood | Sun, 01 September 2002 11:31 |
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Re: removing Ackerman Steering
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jazae86 | Sun, 01 September 2002 13:06 |
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Re: removing Ackerman Steering
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5KinKP60 | Sun, 01 September 2002 16:06 |
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Re: removing Ackerman Steering
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jazae86 | Sun, 01 September 2002 16:20 |
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Re: removing Ackerman Steering
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5KinKP60 | Mon, 02 September 2002 13:07 |
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Re: removing Ackerman Steering
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Jonny2TG | Mon, 02 September 2002 14:51 |
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Re: removing Ackerman Steering
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5KinKP60 | Mon, 02 September 2002 18:49 |
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Re: removing Ackerman Steering
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Jonny2TG | Tue, 03 September 2002 01:40 |
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Re: removing Ackerman Steering
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gold28 | Tue, 03 September 2002 03:49 |
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Re: removing Ackerman Steering
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Jonny2TG | Tue, 03 September 2002 05:10 |
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Re: removing Ackerman Steering
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gold28 | Tue, 03 September 2002 06:06 |
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Re: removing Ackerman Steering
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Jonny2TG | Tue, 03 September 2002 13:06 |
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Re: removing Ackerman Steering
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Jonny2TG | Sun, 08 September 2002 17:17 |
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Re: removing Ackerman Steering
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5KinKP60 | Sun, 08 September 2002 18:42 |
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Re: removing Ackerman Steering
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Jonny2TG | Mon, 09 September 2002 17:45 |
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Re: removing Ackerman Steering
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oldcorollas | Mon, 17 November 2003 06:10 |
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Re: removing Ackerman Steering
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Lambolica | Mon, 17 November 2003 06:16 |
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Re: removing Ackerman Steering
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Jonny2TG | Mon, 09 September 2002 17:57 |
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Re: removing Ackerman Steering
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TurboRA28 | Mon, 17 November 2003 00:48 |
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Re: removing Ackerman Steering
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Jonny2TG | Tue, 18 November 2003 07:33 |
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Re: removing Ackerman Steering
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gold28 | Mon, 17 November 2003 02:28 |
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Re: removing Ackerman Steering
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TurboRA28 | Mon, 17 November 2003 03:25 |
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Re: removing Ackerman Steering
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Lambolica | Mon, 17 November 2003 03:49 |
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Re: removing Ackerman Steering
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TurboRA28 | Mon, 17 November 2003 04:03 |
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Re: removing Ackerman Steering
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Lambolica | Mon, 17 November 2003 04:06 |
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Re: removing Ackerman Steering
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gold28 | Mon, 17 November 2003 04:03 |
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Re: removing Ackerman Steering
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Lambolica | Mon, 17 November 2003 04:13 |
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Re: removing Ackerman Steering
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TurboRA28 | Mon, 17 November 2003 04:10 |
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Re: removing Ackerman Steering
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gold28 | Mon, 17 November 2003 04:34 |
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Re: removing Ackerman Steering
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gold28 | Mon, 17 November 2003 04:50 |
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Re: removing Ackerman Steering
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Lambolica | Mon, 17 November 2003 05:02 |
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Re: removing Ackerman Steering
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TurboRA28 | Mon, 17 November 2003 04:45 |
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Re: removing Ackerman Steering
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TurboRA28 | Mon, 17 November 2003 05:35 |
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Re: removing Ackerman Steering
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gearb0x | Mon, 17 November 2003 08:32 |
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Re: removing Ackerman Steering
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TurboRA28 | Mon, 17 November 2003 11:18 |
