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I supported Toymods
Location:
Adelaide
Registered:
May 2002
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AE86 RCA
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Tue, 16 July 2002 15:54
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Does anybody know the dimensions from hole centre to hole centre on a set of negative roll centre adjusters.
I know I can work it out, but I thought I would try anyway.
I want 2degrees of negative camber.
Jaz
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I supported Toymods
Location:
Northern Beaches
Registered:
May 2002
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Re: AE86 RCA
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Tue, 16 July 2002 23:19
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umm im no expert but I don't think RCA affect the camber as I know a few people on toymods have them and they complain about not having much or any negative camber.
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Location:
Montrose, VIC
Registered:
May 2002
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Re: AE86 RCA
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Wed, 17 July 2002 00:05
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Yah. Unless you got some roll centre adjusters made with a rediculous (and probably hazardous) offset, you're not gonna see big camber changes with them. Instead, get something else like adjustable lower arms or strut tops.
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Location:
Sydney, Australia
Registered:
May 2002
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Re: AE86 RCA
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Wed, 17 July 2002 00:37
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Fitting RCAs will normally have a detrimental effect on camber, you could try and find something like these:
(curteosy club4ag.com)
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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 04:15
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Guy's
I already have 30mm RCA's. I am thinking of getting negative RCA's made. Sort of like the pic.
I know when you lower the car or have Coilover (check) the mac pherson struts will create neg camber (and toe). Installing RCA will take out camber and if the RCA is the same height as the car is lowered, you will be back to factory camber and factory RC.
I want negative camber RCA as I plan on running 2 deg of negative camber all the time. I know I can do it with my strut tops, but by using neg roll centers it will be easier and the strut tops will not have to be as wildly set to make the camber.
Jaz
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Location:
Tasmania
Registered:
May 2002
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Re: AE86 RCA
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Wed, 17 July 2002 08:53
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Using those things in the picture, would increase your scrub radius. I'm not sure to what degree that would effect anything. I would do a bit of thinking before using them. I would sooner lengthen the control arms (that what I did). I hadn't seen this option before though. Does anyone here use them?
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Location:
Eastern Sydney
Registered:
May 2002
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Re: AE86 RCA
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Wed, 17 July 2002 09:21
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| jazae86 wrote on Wed, 17 July 2002 2:15 PM |
I want negative camber RCA as I plan on running 2 deg of negative camber all the time. I know I can do it with my strut tops, but by using neg roll centers it will be easier and the strut tops will not have to be as wildly set to make the camber.
Jaz
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do you have adj. strut tops already? I'd be going for the adj. strut top option if you have coilovers.
offset RCAs are nasty. I don't know about the rest of you,but I know I don't want my struts hanging over an inch off to one side of the knuckles.
as you'll need to import the offset RCAs anyway,I suggest you grab a pair of strut tops instead. they're easier to adjust,and I reckon a bit safer.
I run a normal style 30mm high RCA in my car,and yes,they gain you a quarter of a degree of camber when fitted,but it's easy to fix with the afformentioned lengthened,or adj. lower arms,and/or adj. strut tops.
you do realise an offset RCA will give you a track increase as well don't you? a strut top won't.
Justin...
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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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Location:
Eastern Sydney
Registered:
May 2002
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Re: AE86 RCA
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Wed, 17 July 2002 20:55
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I'll say it again,if you have strut tops coming,these are the best solution.
have you considered the extra loading on the ball joint that offsetting the strut on the knuckle will give? instead of all the impact shock of bumps going straight up it's centreline,every time you hit a bump,the load will try and bend the ball joint,as the stub axle has been offset at least an inch to the outside of the normal position to gain you a useful amount of camber change.
I reckon a modified control arm is a hell of a lot safer than using offset RCAs.
if you don't want to modify an arm,I suggest you head down to your local wrecker with some measuring equipment and start looking at celica front ends for a donor lower arm. RA40 bits might work. people have used sigma arms in the past as well I believe.
Justin...
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Location:
Brisbane / Gold Coast
Registered:
May 2002
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Re: AE86 RCA
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Wed, 17 July 2002 23:08
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5.5° of castor is probably too much - I know one of the guys that ran a Sprinter in Group A racing and they ran 2.5°.
I run about 3° because I can't run any less because of the the suspension bits I have in the car.
FWIW, I also run the front track about 50mm wider than stock and run no front anti-roll bar at all. Front springs are 390lbs/in though. 
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Location:
Wroclaw, Poland, Central ...
Registered:
June 2002
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Re: AE86 RCA
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Thu, 18 July 2002 15:36
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Hi Jaz,
The Cressida MX63 lower arms are 2.5cm longer, but they need some work to fit. XT130 Corona lower arms are 0.5cm longer than a lot of lower arms I measured once when I wanted to get longer arms for my T18.
I will be getting a pair tomorrow, which I plan to put on my AE86 when I get back to Europe, I am yet to find out if they will fit exact. I will let you know.
Laid'er
Rob
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