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Tracking in minutes #1249685
16/08/2011 13:38 16/08/2011 13:38
Joined: Aug 2010
Posts: 141
East yorkshire
sherlock Offline OP
On a journey
sherlock  Offline OP
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Joined: Aug 2010
Posts: 141
East yorkshire
Does anyone know what I need to get the tracking set to in minutes get to 2mm toe in.

Thanks
Re: Tracking in minutes [Re: sherlock] #1249709
16/08/2011 14:36 16/08/2011 14:36
Joined: Dec 2005
Posts: 22,312
Aldershot
PeteP Offline
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PeteP  Offline
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Surely, due to manufacturing tolerances, every car will need a different angular setting to achieve 2mm toe in.

16VT and X1/9 1500 + e208 Peugeot

We must all do our part for the planet.
I unplugged a row of electric cars that nobody was using.
I even unplugged my own.
Re: Tracking in minutes [Re: sherlock] #1249826
16/08/2011 19:49 16/08/2011 19:49

M
MrT
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MrT
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M



Try using this calculation, I reckon if you've got 16" rims, each degree would be 3.546mm

Better get the mathematicians out there to check it though crazy

1. Multiply rim diameter in inches by 25.4 to get rim diameter in mm.
2. Multiply the result by PI to get the circumference.
3. Divide the result by 360 to get mm per degree.

Re: Tracking in minutes [Re: ] #1249843
16/08/2011 20:59 16/08/2011 20:59
Joined: Oct 2009
Posts: 684
Derby
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Ecrab Offline
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Ecrab  Offline
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Joined: Oct 2009
Posts: 684
Derby
Originally Posted by MrT
Try using this calculation, I reckon if you've got 16" rims, each degree would be 3.546mm

Better get the mathematicians out there to check it though crazy

1. Multiply rim diameter in inches by 25.4 to get rim diameter in mm.
2. Multiply the result by PI to get the circumference.
3. Divide the result by 360 to get mm per degree.

No this is not correct.
Each wheel should have 1mm toe in. the calculation is Arcsin 1/(16x25.4) = 0.1409 degrees per wheel
Total = 0.2818 degress

Last edited by Ecrab; 16/08/2011 21:22.
Re: Tracking in minutes [Re: sherlock] #1249929
16/08/2011 22:55 16/08/2011 22:55

D
devbod
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devbod
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You're both right smile

One gives mm/degree, the other degrees/mm. Roughly 17 minutes 'in' on each wheel.

When I read the title I though sherlock just wanted to adjust his tracking quickly rolleyes

Re: Tracking in minutes [Re: sherlock] #1249939
16/08/2011 23:19 16/08/2011 23:19
Joined: Aug 2010
Posts: 141
East yorkshire
sherlock Offline OP
On a journey
sherlock  Offline OP
On a journey

Joined: Aug 2010
Posts: 141
East yorkshire
Thanks for the replies,

My mate did it earlier we guessed it at 10 minutes, its definatley better than the 2 degrees it was. The steering wheel's now slightly on the piss so when he straightens it up i'll ask him to get nearer 30 minutes.

Cheers
Re: Tracking in minutes [Re: sherlock] #1249954
16/08/2011 23:59 16/08/2011 23:59
Joined: Aug 2010
Posts: 141
East yorkshire
sherlock Offline OP
On a journey
sherlock  Offline OP
On a journey

Joined: Aug 2010
Posts: 141
East yorkshire
Thinking about it, is there 60 mins in 1 degree? If so I'm not far off as it is maybe go for 15 minutes total toe in?
Re: Tracking in minutes [Re: sherlock] #1250088
17/08/2011 11:44 17/08/2011 11:44

H
h2ypr
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h2ypr
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Can I ask anyone to explain the use of minutes in tracking?

Ross
Re: Tracking in minutes [Re: ] #1250270
17/08/2011 19:35 17/08/2011 19:35
Joined: Oct 2009
Posts: 684
Derby
E
Ecrab Offline
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Ecrab  Offline
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Joined: Oct 2009
Posts: 684
Derby
Originally Posted by devbod
You're both right smile

One gives mm/degree, the other degrees/mm. Roughly 17 minutes 'in' on each wheel.

rolleyes

Not quite true. MrT's calculation gives the relationship between distance around the circumfrence and angle. What is required is the relationship between cordal distance and angle, however I accept for small angles the inaccuracy is negliable
Re: Tracking in minutes [Re: sherlock] #1250271
17/08/2011 19:37 17/08/2011 19:37

M
MrT
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MrT
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I believe it all started with geometry used for navigation, this link explains better than I can

Degrees and minutes

laugh

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