Hi, I bought some ma61 coilovers with brakes for my T18 and now I heard that they screw up your caster and give you either positive or negative camber?

 

Tryed looking on the net and looked through a dozen threads on here and couldn't find anything.

 

The picture is of the coilover I bought.

 

Also have custom steering arms of ae86 PS length with the correct bolt spacing and rcas to suit as well.

Edited February 9, 201115 yr by 19914afc

Also have corona lower control arms to go in.

Well if you decide not to use them let me know... I'm sure they'll fit my wife's RA60 ;)

you should be right with camber tops so you can adjust the camber back to suit. i believe its the control arms that give you a wack caster setting. Not 100% sure but a friend who was talking to me last night about his ra60/ra65 shit.

According to this thread on toymods, where the angle of the strut housing was measured compared to the stub axle, there is definitely a difference between MA61 and KE70, with the MA61 giving more positive camber.

 

http://www.toymods.org.au/forums/showthread.php?t=50999&highlight=database

 

But strut tops and different LCA's may negate this.

 

I don't know what effect all those angles have on scrub radius / steering geometry, but I am tipping its not ideal.

 

In case you can't see that thread, the summary of the angles was

 

RA40: 7.6 or 8.4 degrees

KE70: 8.4

RA28: 8.4

TA22: 8.4

XT130: 8.7

MA61: 10.6

MX83: 13.1

that angle is what is called your "king pin inclination".

 

in order to "Fix" it you could either go with longer control arms, or those camber tops to attempt to bring the excess positive camber in.

 

no idea on the effects of a different KPI...no idea.

 

buy this

 

http://papers.sae.org/2001-01-2732

 

then send me a copy!

Its no race car so if it steers straight and I am getting corona lcas and camber tops so that should defiantly fix the camber.

that angle is what is called your "king pin inclination".

 

in order to "Fix" it you could either go with longer control arms, or those camber tops to attempt to bring the excess positive camber in.

 

no idea on the effects of a different KPI...no idea.

 

buy this

 

http://papers.sae.org/2001-01-2732

 

then send me a copy!

 

Thats for medium duty truck handling.

 

 

was reading this

 

King pin inclination is the transverse angle of the swivel axis of the front wheel and its stub axle. The

effect of the inclination is usually discussed in terms of the king pin offset which determines the self

centering torque when the steering is turned for cornering. Although many cars have a positive value of

offset which tends to return the wheel to the straight ahead position, some modern cars have a negative

offset to improve stability when the tire blows or the brake fails on one front wheel.

 

Then read some more about it and another site said with the stub axle/spindle @ 90 degrees has a 0 deg kingpin inclination, which should be able to be changed with longer control arms and the camber tops I am getting.

This seems like a good way to gain track without the massive camber gain from much longer lca's, I also have acess to a wheel alignment machine at my work so I should get it all sorted out fine.

 

One other thing is the corona lcas have no steering stops and my std lcas do will this be much of a problem?

Also watched this video,

http://www.youtube.com/watch?v=fxtyfJLExzw

 

So according to this video if the camber setting is correct at standard the steering inclination angle (king pin angle) should be normal.

But that would mean when adding negitive camber to a car would change that angle but doesn't seem to do so in a bad way, unlike the supra coilovers which give positive camber and change the angle in a bad way to the alignment angles.

 

Looks like i answered my own question, haha.

Edited February 10, 201115 yr by 19914afc