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Old 18th January 2018, 02:16 AM   #201
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Lambo
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Re: McCopy mk 5

Hi Russell, I suspect the errors are due to your camber change on bump and droop, i made a Guage years ago that worked great it was two pieces of plywood big enough to cover the wheel rim , one piece sat on the floor with a weight on it, the other piece attached with three small hinges and formed an L shape. on the verticle piece that was about 3 inches from the rim it had a bolt with a lock nut that leaned against one outer edge of the rim the other side had a a dial tester leaning on the other side of the rim to measure any changes in toe, i think you will find the fore and aft movement of the rack has a greater effect on Ackerman ,on your setup is the inner pivot on the rack in line with the line drawn through the inner top and bottom mounting point , alot of suspensions I have looked at recently the rack inner joint is towards the wheel by about 40mm not on the line through the top and bottom inner pivots. if you get stuck give me a call two heads are always better with the Guage on the side it can bend at the hinge and so follow in and out as your camber changes as the wheel rises and falls .

Last edited by Lambo; 18th January 2018 at 04:55 AM.
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Old 18th January 2018, 03:19 PM   #202
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russell keach
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Re: McCopy mk 5

Graeme
Yes there is camber change due to the suspension arms being unequal, I just need to talk to LVVTA to find out what sort of tolerance they accept as I have ride and bump acceptable.
Have you still got that 4k chassis set up?
Cheers
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Old 18th January 2018, 03:38 PM   #203
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Re: McCopy mk 5

Yes still have it but it will need a rebuild.
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Old 18th January 2018, 06:20 PM   #204
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Re: McCopy mk 5

Graeme
looking for a motor/gearbox / diff thanks. Email me price thanks
Cheers
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Old 19th January 2018, 05:07 AM   #205
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Re: McCopy mk 5

Hi Russel
I concur with Graeme, the biggest change in toe will come from the rack height and width.
To get near zero, you’ll need a combination of both and a truck load of time…
A rack height change of 0.010” will make a difference in toe.
I made a rack mount that could be shimmed (using std tie rod ends for road use) and gradually widened and shortened the rack until I was happy.

Used a board similar to what Graeme described, here’s a few pictures of it from my build thread http://www.gt40s.com/forum/452723-post32.html
http://www.gt40s.com/forum/452725-post33.html


Clayton
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Old 19th January 2018, 07:03 AM   #206
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Re: McCopy mk 5

Hi Russ mate toe out on full droop i wouldnt be to concerned about. as long as its minimal on bump, but in saying that it can be used on bump as a tuning aid, depending on your driving style as it will promote a slight under steer, or push for you other blokes after initial turn in, the 23 im putting together has about 4mm total of toe out at full bump and thats as good as i can get it but i'm happy enough as it suits me and the way i drive.
to be honest i think a lot of the time to much emphasis is put on its eradication like its the plague or something, where as it can be quite usefull.
cheers john
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Old 20th January 2018, 03:29 AM   #207
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Re: McCopy mk 5

Thanks John, I rang LVVT and they were very helpful, got a 17 page doco that explains what where how and who!. I have just ordered new shorter steering rods as I was screwed-in hard and run out of adjustment. Starting to get my head around what to do so shed time will cure it.
Cheers Russell
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Old 20th January 2018, 10:25 PM   #208
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Re: McCopy mk 5

Hi Russell, I am at a similar point on my build after changing to bmw uprights arms etc at the front would you be able to forward me a copy of what when why to [email protected]. it might help I'll give you a call re engine etc
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Old 11th February 2018, 11:59 PM   #209
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Re: McCopy mk 5

That stinky stuff again.
Still we have moved two doors closer now, waxing the back clip ready for the next wind change.
Cheers
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Old 18th February 2018, 04:42 AM   #210
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Re: McCopy mk 5

Rear clip molded and removable spoiler molded on rear, and yes it popped off ready to be tidied up and refitted as per original. There are a few details now to be added like the side scoops etc, so only the nose to do next after a bit of a break, laid up the tail in about 2 hours....hot work in a mask.
Cheers
Russell
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