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I supported Toymods
Location:
Adelaide
Registered:
May 2002
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Re: AE86 RCA
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Wed, 17 July 2002 16:05
 
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I have:
Coilovers
Strut tops (not in my possesion but soon)
30mm John Harris RCA's
More 15x6.5 +22 rims (too much offset but better than stock 13")
I want to run 5.5 deg caster and 2 deg negative camber and close to factory toe. Spring rate will be 230/190lb/" f/r.
I don't mind track increase, infact I would prefer track increase over no increase, however I don't want to increase my scrub radius, but with such high offset rims (any more and it would rub against the strut) I doubt my scrub radius would be that bad. When I change my rims to whatever I can get close to 15x7 +-0 then I will have scrub radius issues. Considering my high caster angle, steering is already going to be an issue at slow speeds, but such is life, a good handling car and nice suspension geometry through out suspension movement.
As an engineering student, I made a CAD model of an RCA (based of course on the stut bottom) as a way of learning CAD. I easily modified it into an neg camber by looking at the pic's in HypeREV. That's why I wanted the measurment: to finalise the model.
I have however come to realise that the actual distance of bolt hole spacing is particular to the hieght of the car(well length of macpherson strut). As the amount of camber is directly related to the height of the car, then any alteration in height will effect the amount of camber that is being produced. In the HyperREV mag I have, there are neg roll centre adj from 2 to 4 deg and 20 to 50mm in thickness. Obviously they just pick some numbers and sell them as they please.
Thanks for the input people. I may just stick with getting larger RCA's made (close to 40/50mm.
Next question is: what factory Toyota control arm (with same ball joint as AE86) is longer than the AE86 but bolts in? Cutting and welding of the arm does not seem that safe. I'd rather use solid machined aluminium RCA's than cut and welded control arms (no offence jonny2TG, but personal choice).
Jaz
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