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PostPosted: June 13, 2021, 9:12 am 
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Joined: December 27, 2013, 12:17 pm
Posts: 14
Hello
I'm battling bump steer now, and I plan to use rod end for my rack instead of OE ball joints
I want to twist steering arm more vertical (parallel with brake disc for reference).
Will that affect steering geometry?


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PostPosted: June 13, 2021, 10:39 am 
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It can change the geo, but it is easier to just heat, twist and duplicate on the other side than try to keep the ball at the same lateral position which is not critical. Most design around wherever the ball happens to be.

I assume you know how to perform the procedure.

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Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS viewtopic.php?f=5&t=13225&p=134742
Simple Spring select viewtopic.php?f=5&t=11815
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360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
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McSorley 442:122x46x14
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PostPosted: June 13, 2021, 11:48 am 
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Joined: December 27, 2013, 12:17 pm
Posts: 14
Miatav8,MstrASE,A&P,F wrote:
It can change the geo, but it is easier to just heat, twist and duplicate on the other side than try to keep the ball at the same lateral position which is not critical. Most design around wherever the ball happens to be.

I assume you know how to perform the procedure.

Any idea what setting will be affected?
Ackerman angle? Toe?
Heat and twist is easier i know, but i have professional TIG and MIG welder next to me, had 3 trackday cars with 12 cast uprights which had at least 2 cut-and-weld parts on it with no single issue for 10 years since. I know that is not right way to do it, but can take that risk.
Still not have clear decision how to do it, but i plan to remove half of the steering arm and weld some fat plate for any extra Ackerman....14mm rod end.....
I'm eager to fit steering rack in some exact position(fore-aft) and then be able to adjust bump steer from steering arm.....actually i can move rack up and down as much as i need.....
It will be trackday car and i need much more pro-ackerman cause our tracks here had many sharp and high angle turns.


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PostPosted: June 13, 2021, 3:34 pm 
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Shortening the arms on a front steer spindle without moving the rack aft to compensate reduces ackerman from whatever it had (i.e. reverse ack).
Having the balls as far outboard as practical helps with the spindle/bellcrank ratio through the range of motion.
Toe is whatever you set it to.

_________________
Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS viewtopic.php?f=5&t=13225&p=134742
Simple Spring select viewtopic.php?f=5&t=11815
LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12


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PostPosted: June 13, 2021, 3:56 pm 
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Joined: December 27, 2013, 12:17 pm
Posts: 14
Miatav8,MstrASE,A&P,F wrote:
Shortening the arms on a front steer spindle without moving the rack aft to compensate reduces ackerman from whatever it had (i.e. reverse ack).
Having the balls as far outboard as practical helps with the spindle/bellcrank ratio through the range of motion.
.

Yes, i'm aware about how to achieve more pro-ackerman, but its first time for me to try front steer upright......i use BMW hubs and some Chrysler front disc with less overall height than MX5's, and can place outboard joint 10mm far than original.
Thanks for the input.....


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