The Optima Mid was designed in 1987 and released to the public in 1988. It was kyoshos Top 4WD buggy in 1988 - 1989, and replaced by the Lazer ZX in 1990. This blog is created by me to let all other Optima Mid owners know what modifications i did to the car to improve its performance, or just to substitute parts to get it runnable.
Sunday, 9 November 2014
11-Nov-2014, all paid off !
The car was incredible with the 7 degree caster blocks. I was finally able to drive it really well and keep with modern cars. The tail wasn't swinging anymore.
Friday, 7 November 2014
Adding caster to front
I have changed back to ball diffs, because the geardiffs don't seem so smooth. Since I did not have enough parts to rebuild a rear ball diff, I made some improvements to the standard kyosho rear ball diff.
I also used Lazer ZX-5 7 degree c hubs with 3racing ver2 ZX-5 alloy knuckles. I had to grind the c hubs in the fronts to make sure it will fit into the arms without binding. I am in the process of making a ZX arm that will be a direct fit with ZX-5 c hubs.
I got a 8x16x5 bearing, and got my machine shop to make a 16mm sleeve with 19.8mm outer diameter. |
The bearing slides into the geardiff casing |
This ball diff is now very smooth. |
7 degree caster blocks with 3 degrees in the arm mounts equal 10 degrees total. this should improve handling. However I find that steering throw is also reduced. |
Assembled parts. The front CVD is 3racings 65.5mm and upper turnbuckle is now 50mm. |
Grind the c hub below the angle mark. With my new arms which will be ready next week, no modifications will be needed. |
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