Worth doing caster mod?
21 February 2020, 10:56 PM
#1
Worth doing caster mod?
Soon I will be booking my 2003 blob sti in for a full geo set up, as I have had some parts off for a cean up, should I do the free castor mod ?? Im runing kyb ultra sr, and WAA2 spring from 2pot on here, The car is mainly a B road blaster. Is it worth mid and should I add extra spacing?
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Not sure how to link in 2pots user to the thread?
23 February 2020, 01:07 PM
#3
Flip the pins 180 deg. If you're unlucky, you might damage the aluminium threads undoing the bolts 
If you use spacers, you'll need longer 10.9 grade, high tensile, bolts (not 12.9) flanged or with 4 x high tensile washers - ensure the bolt/spacer combination doesn't contact the chassis rail. You may need to use a thinner spacer and/or cut the end off the bolts - I've never found the perfect length bolts. Two, of the 4, will be longer, after you've cut the bolts down - as the lower control arm widens.
The AS Performance modified arms (attached) are nice, I'd rather have them with group n rubber in the rear bushes and stock rubber in the front bush. Don't know what the turn around time would be if you bent one? As I believe you send in your own arms to be modified?
Are you using Whiteline top mounts?
If you use spacers, you'll need longer 10.9 grade, high tensile, bolts (not 12.9) flanged or with 4 x high tensile washers - ensure the bolt/spacer combination doesn't contact the chassis rail. You may need to use a thinner spacer and/or cut the end off the bolts - I've never found the perfect length bolts. Two, of the 4, will be longer, after you've cut the bolts down - as the lower control arm widens.
The AS Performance modified arms (attached) are nice, I'd rather have them with group n rubber in the rear bushes and stock rubber in the front bush. Don't know what the turn around time would be if you bent one? As I believe you send in your own arms to be modified?
Are you using Whiteline top mounts?
Last edited by 2pot; 23 February 2020 at 01:09 PM.
24 February 2020, 11:39 AM
#5
The stock flanged bolts are m12 x 37mm 1.25 pitch 10.9 grade (don't use 12.9).
You could use 3mm spacers and flip the pin with some 40mm long flanged bolts - no clearance issues to the chassis rail.
If you used thicker spacers and longer bolts, you'd have to run a tap through the threaded holes, as the hole continues through the arm, but not the thread.
You'd probably still have to shorten the bolts to finish flush with the arm, so clearing the chassis rail, throughout the arm's arc of travel.
If you can't get flanged bolts you could use, form A, M12, 10.9 grade, high tensile washers and add 3mm onto the bolt length.
You could use 3mm spacers and flip the pin with some 40mm long flanged bolts - no clearance issues to the chassis rail.
If you used thicker spacers and longer bolts, you'd have to run a tap through the threaded holes, as the hole continues through the arm, but not the thread.
You'd probably still have to shorten the bolts to finish flush with the arm, so clearing the chassis rail, throughout the arm's arc of travel.
If you can't get flanged bolts you could use, form A, M12, 10.9 grade, high tensile washers and add 3mm onto the bolt length.
Last edited by 2pot; 24 February 2020 at 04:37 PM.
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28 February 2020, 05:13 PM
#9
Maybe?:
A hardened spacer, a reduced height, high tensile, coneloc nut (10.9 grade?) on the pin, and the front bush housing has been milled away - 'SUBARU' became 'SUBAI' (on the above example) to alter the positioning of the front bush.
I assume the spacer size and then a related amount of milling of the arm, will combine to dictate the required amount of extra caster.
A hardened spacer, a reduced height, high tensile, coneloc nut (10.9 grade?) on the pin, and the front bush housing has been milled away - 'SUBARU' became 'SUBAI' (on the above example) to alter the positioning of the front bush.
I assume the spacer size and then a related amount of milling of the arm, will combine to dictate the required amount of extra caster.
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24 April 2020, 11:17 AM
#12
No didnt try it, I was going do it this last month but the place I get my alignment done are closed, scooby has just been parked up for the last 5 weeks as its a second car, so im putting it off untill then. Im going to continue to clean the underside up while its off the road, I had the struts off last year and cleaned up all the arch/wheel well area. Would love to strip everything off the bottom but im worried about getting it all back together in my garage on stands
24 April 2020, 05:36 PM
#13
No didnt try it, I was going do it this last month but the place I get my alignment done are closed, scooby has just been parked up for the last 5 weeks as its a second car, so im putting it off untill then. Im going to continue to clean the underside up while its off the road, I had the struts off last year and cleaned up all the arch/wheel well area. Would love to strip everything off the bottom but im worried about getting it all back together in my garage on stands
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