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oldcorollas
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003

Re: KE10 - KP61 front end conversion

Fri, 22 July 2005 06:21

ke1500 wrote on Fri, 22 July 2005 09:11

For all the suspension/steering gurus out there, I understand that if I was to do a rack and pinion steering conversion, the inner ball joints should rotate around the same axis as the lower control arms ie pivot from the same spot when the wheels are in a straight line, but what I dont understand is why when I measured up my ke10 last night, I discovered that the steering arms actually pivot closer together than the lower control arms. From memory its about 2cm shorter either side, wouldnt this cause bump steer? Or would it have been designed like this at the factory taking into account the effects of other things, and they were actually made to pivot differently for a reason?

well.. if you look at the steering arms, the tie rod end actually sits inboard of the strut pivot.. by maybe 2cm Wink

Quote:

Stewart, your a gun at this kind of stuff. any ideas?? Im looking at doing a ke20 front end conversion and using a rack & pinion and crossmember out of a KP61. That could be hard though considering ive never seen one in Australia..

aww shucks Embarassed

yar, hard to come by in aus, and parts would cost a bomb to import.. although if you had the steering rack, you can pretty much bodge up everything else... use a KE70 steering column maybe?

k.. what IS important is that the length of the tie rod is the same as the length of the lower control arm.. and that, when viewed from the front of the car, the arm and tie rod are parallel. if they are also parallel viewed from the top. there can be no bump steer, regardless of where the actiual pivot points are.

BUT, you want ackermann angles, so to do this, you move the steering rack behind the steering arm pivots, and lengthen the tie rods a bit..

this is where it gets tricky... you have a trade off between position of rack, length of tie rod, change in effective width of tie rod with suspension travel etc...

ideally you would just copy the whole lot, and keep all the original points in the same position (including wheeelbase and track)

anyhoo, a few thoughts... it aint simple and you neeed to think in 3D for both ssuspension movement and steering input... not easy for old brains Wink

but it is just a mathematical problem..

Cya, Stewart

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