daniel mason
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| posted on 18/7/13 at 09:24 PM |
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is it possible to modify a steering rack
one thing ive noticed on the ADR is the lack of steering angle. 1/2 a turn of the steering wheel is full lock and turning circle horrendous!
as you can see the stops only allow a couple of inches of travel on the rack. is there any way to increase lock? as i dont think it will even get
round a tight corner as it is!
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mark chandler
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| posted on 18/7/13 at 09:59 PM |
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It is possible yes, you need to strip it down and validate that by shortening the ends you still retain bearing surfaces and the toothed rack has
enough teeth.
If that's all good chop an inch off each sleeve end and weld up.
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daniel mason
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| posted on 18/7/13 at 10:05 PM |
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what about the rack mounting clamps?
they are on special brackets welded to chassis but right on the outer edge of the rack body
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Simon
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| posted on 18/7/13 at 10:21 PM |
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You'll have to weld on new mountings.
I had my old Sierra rack shortened by Gerry Hawkridge for about £150
ATB
Simon
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r1_pete
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| posted on 19/7/13 at 06:50 AM |
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How about shortening the pivot point on the hub levers? looks do-able on your setup.
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Mr Whippy
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| posted on 19/7/13 at 06:55 AM |
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I'm going to be brutally honest, if you have to ask don't do it
It's a tricky job and safer if you just got a new rack that gave you enough travel without being altered. Something like a fiat cinquecento rack
looks like it would fit there
I think you'll still have to get a new mounting plate burnt out to fit it, looks like aluminium
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Mr Whippy
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| posted on 19/7/13 at 06:57 AM |
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quote:
Originally posted by r1_pete
How about shortening the pivot point on the hub levers? looks do-able on your setup.
Sure looks like that's possible, interesting hub design
Steering will obviously get heavier though
[Edited on 19/7/13 by Mr Whippy]
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MikeRJ
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| posted on 19/7/13 at 07:23 AM |
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quote:
Originally posted by Mr Whippy
quote:
Originally posted by r1_pete
How about shortening the pivot point on the hub levers? looks do-able on your setup.
Sure looks like that's possible, interesting hub design
Steering will obviously get heavier though
[Edited on 19/7/13 by Mr Whippy]
And quicker. I suspect it will already be fairly quick.
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Not Anumber
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| posted on 19/7/13 at 08:06 AM |
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quote:
Originally posted by Simon
You'll have to weld on new mountings.
I had my old Sierra rack shortened by Gerry Hawkridge for about £150
ATB
Simon
How is old Gerry, ive not seen him for years since i built the Hawk AC ACE replica.
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britishtrident
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| posted on 19/7/13 at 11:37 AM |
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The rack looks do-able at a modest cost but you would need check out the required new mounting points on the chassis are viable.
If the new mounting points aren't suitable it might be possible to make an adaptor plate to fit between the rack and the chassis.
I would advise against shortening the steering arms as it is likely to have nasty implications for the steering geometry .
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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daniel mason
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| posted on 19/7/13 at 11:55 AM |
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i think they were meaning re drill the bracket out and move the the pivot point closer to the wheel. shouldnt affect geometry but will make steering
slightly heavier. but would mean the same amount of steering input would increase turn in a small amount. i may take it to procomp to set up and let
them take a look! cheers guys
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britishtrident
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| posted on 19/7/13 at 04:36 PM |
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quote:
Originally posted by daniel mason
i think they were meaning re drill the bracket out and move the the pivot point closer to the wheel. shouldnt affect geometry but will make steering
slightly heavier. but would mean the same amount of steering input would increase turn in a small amount. i may take it to procomp to set up and let
them take a look! cheers guys
A wee bitty more complex than that it will effect the steering geometery as the fore-aft dosposition of either the rack-ends ends or outer
the track rod ends has an effect on the toe accross the axle in turns.
[Edited on 19/7/13 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Not Anumber
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| posted on 19/7/13 at 04:57 PM |
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Whatever you end up doing to the steering rack dont let an amateur drill and tap the end. Having a track end detach is no fun at all.
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britishtrident
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| posted on 20/7/13 at 04:25 PM |
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I think the OP just intends to shorten the outer tube of the rack.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Uphill Racer
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| posted on 28/7/13 at 11:19 PM |
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How tight a corner do you need to navigate, what are you using the car for?
BT is correct in that moving the outer track rod ends can affect Ackermann but done right reducing the length will “speed up” the rack, reducing the
outer casing will give more travel but will need more steering input. If you are using the car for a different discipline you may want to alter
Ackermann to suit.
Some racks are easier to alter than others, this is a late model Mini rack drastically modified.
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Simon
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| posted on 2/8/13 at 07:45 PM |
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quote:
Originally posted by Not Anumber
quote:
Originally posted by Simon
You'll have to weld on new mountings.
I had my old Sierra rack shortened by Gerry Hawkridge for about £150
ATB
Simon
How is old Gerry, ive not seen him for years since i built the Hawk AC ACE replica.
No idea, this was about 8 or 9 years ago. I do remember the conversation quite well though - after intros were made, it went along the lines of:
"What are you building?"
"A seven type car from Ron Champio......."
"Ron Champion's a c***"
That's all I remember, and a vague explanation of bump steer
ATB
Simon
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rdodger
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| posted on 2/8/13 at 07:53 PM |
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quote:
Originally posted by Simon
quote:
Originally posted by Not Anumber
quote:
Originally posted by Simon
You'll have to weld on new mountings.
I had my old Sierra rack shortened by Gerry Hawkridge for about £150
ATB
Simon
How is old Gerry, ive not seen him for years since i built the Hawk AC ACE replica.
No idea, this was about 8 or 9 years ago. I do remember the conversation quite well though - after intros were made, it went along the lines of:
"What are you building?"
"A seven type car from Ron Champio......."
"Ron Champion's a c***"
That's all I remember, and a vague explanation of bump steer
ATB
Simon
Good old Gerry. He isn't known for his tact!
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