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jonno_racing

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Joined: Wed Apr 15, 2009 11:30 pm
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Location: Tassie
Vehicle: suzuki

Posted: Tue Aug 23, 2011 4:42 am

what is correct caster for a wt sierra? does any one know?
setting up a wt diff under my coiler soon and would like it to be spot on.

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tanshi

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Joined: Tue Jan 09, 2007 10:30 pm
Posts: 7717
Location: Brisbane

Posted: Tue Aug 23, 2011 4:49 am

http://www.zukioffroad.com/Tech_Library ... ations.htm

Gwagensteve

Joined: Thu Feb 26, 2009 10:30 pm
Posts: 13007
Location: Melbourne

Posted: Tue Aug 23, 2011 7:29 am

Are you running power steer Jonno?

If so, then wind in more caster. IMHO sierras have inadequate caster, and it's mostly because they had manual steering.

Increasing caster makes manual steering much heavier as you are effectively lifting up the front of the car as you steer. However, it's not an issue with power steer so it's a good opportunity to improve turn in and handing.

My WT front diff has (apparently) 3? more caster than a stock WT and I can attest it's massively better on turn in than a stock sierra.

Steve.

Gwagensteve

Joined: Thu Feb 26, 2009 10:30 pm
Posts: 13007
Location: Melbourne

Posted: Tue Aug 23, 2011 7:31 am

Auszookers gremlin

Steve.

jonno_racing

az supporter

Joined: Wed Apr 15, 2009 11:30 pm
Posts: 8164
Location: Tassie
Vehicle: suzuki

Posted: Tue Aug 23, 2011 7:47 am

thanks steve i was hopeful you would pop up... currently i have 2' of negative caster due to lift and no caster correction.. yeah it drives shit!

so you would suggest around 6'?

edit

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JrZook

Joined: Tue Aug 08, 2006 11:30 pm
Posts: 5517
Location: Holland Park
Vehicle: Awesome!!

Posted: Tue Aug 23, 2011 7:56 am

You sure you have 2deg 'negative' caster? That thing must be nice and wandery over the road

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jonno_racing

az supporter

Joined: Wed Apr 15, 2009 11:30 pm
Posts: 8164
Location: Tassie
Vehicle: suzuki

Posted: Tue Aug 23, 2011 8:03 am

JrZook wrote:

You sure you have 2deg 'negative' caster? That thing must be nice and wandery over the road

yep.. its pretty average to drive..

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Gwagensteve

Joined: Thu Feb 26, 2009 10:30 pm
Posts: 13007
Location: Melbourne

Posted: Tue Aug 23, 2011 8:08 am

I don't think I'd go +6 - maybe +3?

Steve.

PS my gwagen runs +8 stock from memory

which is why with 65mm of suspension lift and soft shocks it still turns in better than an 80 series with stock caster.

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