Paladin Rally - Re:Calculating Caster Angle and other Suspension Geometry

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ryanrlamothe

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Posts: 221

Re:Calculating Caster Angle and other Suspension Geometry - 2006/04/04 21:52 One of the common things pointed out in reference to alignments is that AWD is aligned more like FWD than RWD. Therefore, you may not want more than 5-10° of caster on the front tires with AWD, whereas a RWD car may want 14-20° or more.

If you put in a lot of caster, you may increase your initial turn-in, but you may also ruin your mid-turn and exit geometry. That might not be so good. Plus, it is usually mentioned that tons of caster can make steering extremely difficult as well, which might not be a desired effect either. All of this may be a moot point if all you want is initial turn-in and the rest of the corner is not as much of an issue.

Post edited by: ryanrlamothe, at: 2006/04/04 21:53

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Matt

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Posts: 485

Re:Calculating Caster Angle and other Suspension Geometry - 2006/04/05 02:25 ohhh... I'm gagging to give away our alignment secrets...

but Phil would kill me (not really).

Subarus stock have only about 2 degrees caster, I believe. We crank it way above 2, but not up to 10.

Steering difficuly and mid-exit handling are inportant, but not if on that slipperyer than expected dirt, you understeer off the road. Or, if you start turning too deep, and have to slough off too much speed.

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John Vanos Visitor	Re:Calculating Caster Angle and other Suspension Geometry - 2006/04/05 16:19 neat thread! Alignment seems to be a black art of sorts, I know im mmissing out somwhere! I beleive I read somewhere that the anti lift kits you can get from whiteline or Perrin give you about 5deg. caster so maybe a bit more is good but 10 may be on the high side...I will see if I can find the alignment settings from the Group N STI's, they are on the net somewhere....back in a few
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John Vanos Visitor	Re:Calculating Caster Angle and other Suspension Geometry - 2006/04/05 16:23 Ok, it seems as in this link that caster is 'standard' so maybe they are not able to change that in GN. http://www.subaru-sti.co.jp/e/GRN/tec_info/data/2004_rd5.html Thats from rally germany http://www.subaru-sti.co.jp/e/GRN/tec_info/data/2004_rd4.html Thats from Argentina A good ballpark for setup anyhow. Interesting that most setups run toe in on the front....I dont know how i'd like that....thoughts?
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Matt

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Posts: 485

Re:Calculating Caster Angle and other Suspension Geometry - 2006/04/05 16:47 There are some neat cheats you can do with the GP N control arms to push the wheel foward a little and gain some caster. Totaly illegal, but tough to spot.

We run a bit of toe in. It makes the car more stable in straight lines. Toe in the rear makes much more effect than toe in the the front. I've bent things to create toe out in the rear, and I didn't like it much, but it was more than one would normally adjust to.

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ryanrlamothe

Moderator

Posts: 221

Re:Calculating Caster Angle and other Suspension Geometry - 2006/04/05 17:27 John Vanos wrote:
neat thread!

Thanks!

I beleive I read somewhere that the anti lift kits you can get from whiteline or Perrin give you about 5deg. caster so maybe a bit more is good but 10 may be on the high side

These are an excellent addition to any Subaru. These kits essentially work by lowering the pick-up points of the lower control arms.

Here is the link to the WhiteLine ALK documentation:
WhiteLine

The bottom of Page 3 and the top of Page 4 is some great information on how their ALK works.

Post edited by: ryanrlamothe, at: 2006/04/05 17:29

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