Kyosho Ultima RB5 Thread
#3363
Tech Fanatic
iTrader: (32)
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Sorry to make a comment about the rack alternative. I was not saying the kit rack was perfect, or the solution wasnt an improvement. My experience has been, forces always find the weakness and make it fail.
Questions to the racers who are having continuous failures of the kit rack...
Where exactly is the crack occuring? Ball Stud location?
Are you running bushing or bearings?
Is your servo saver tight or loose?
Whats the ambient temperature at the track your racing?
I am wondering if temperature is a factor. When Xray first release the XB8, we had issues in the fall/winter with the A Arms becoming brittle in lower temperatures. A change in the composition of the materials solved that problem.
Questions to the racers who are having continuous failures of the kit rack...
Where exactly is the crack occuring? Ball Stud location?
Are you running bushing or bearings?
Is your servo saver tight or loose?
Whats the ambient temperature at the track your racing?
I am wondering if temperature is a factor. When Xray first release the XB8, we had issues in the fall/winter with the A Arms becoming brittle in lower temperatures. A change in the composition of the materials solved that problem.
#3364
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The ear pops off with the balls stud in tact.
The issue is when you get a knife edge landing the forces of the wheel being pushed back into the car is too much and the part fails. IT usually fails with a couple other parts as well though. The front bulkhead might crack and this will transfer load into the steering rod and pop the rack. I don't think I have broken a rack all by itself yet. I think I have gone through three of them. All pretty harsh hits.
Sevo saver set to kit setting. Temps not too cold. (not as cold as you are thinking) honestly I think an alum front bulkhead would fix the issue but I may be full of it. Not sure.
As for arguing with Turbo about chasing loads through parts I already had that argument with him.![Roll Eyes (Sarcastic)](https://www.rctech.net/forum/classic_images/smilies/rolleyes.gif)
![Wink](https://www.rctech.net/forum/classic_images/smilies/wink.gif)
The issue is when you get a knife edge landing the forces of the wheel being pushed back into the car is too much and the part fails. IT usually fails with a couple other parts as well though. The front bulkhead might crack and this will transfer load into the steering rod and pop the rack. I don't think I have broken a rack all by itself yet. I think I have gone through three of them. All pretty harsh hits.
Sevo saver set to kit setting. Temps not too cold. (not as cold as you are thinking) honestly I think an alum front bulkhead would fix the issue but I may be full of it. Not sure.
As for arguing with Turbo about chasing loads through parts I already had that argument with him.
![Roll Eyes (Sarcastic)](https://www.rctech.net/forum/classic_images/smilies/rolleyes.gif)
![Wink](https://www.rctech.net/forum/classic_images/smilies/wink.gif)
![Laughing](https://www.rctech.net/forum/classic_images/smilies/laugh2.gif)
#3368
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#3369
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I have broken racks in the winter inside at the track, not to heated. inside in the summer hot and humid. also broke them at vineland in the summer outdoor. sign me up for the aluminum rack, it and the shock caps are the only parts i really break. i think i broke a pivot block once.
#3370
![Default](https://www.rctech.net/forum/images/icons/icon1.gif)
Sorry to make a comment about the rack alternative. I was not saying the kit rack was perfect, or the solution wasnt an improvement. My experience has been, forces always find the weakness and make it fail.
Questions to the racers who are having continuous failures of the kit rack...
Where exactly is the crack occuring? Ball Stud location?
Are you running bushing or bearings?
Is your servo saver tight or loose?
Whats the ambient temperature at the track your racing?
I am wondering if temperature is a factor. When Xray first release the XB8, we had issues in the fall/winter with the A Arms becoming brittle in lower temperatures. A change in the composition of the materials solved that problem.
Questions to the racers who are having continuous failures of the kit rack...
Where exactly is the crack occuring? Ball Stud location?
Are you running bushing or bearings?
Is your servo saver tight or loose?
Whats the ambient temperature at the track your racing?
I am wondering if temperature is a factor. When Xray first release the XB8, we had issues in the fall/winter with the A Arms becoming brittle in lower temperatures. A change in the composition of the materials solved that problem.
#3371
![Default](https://www.rctech.net/forum/images/icons/icon1.gif)
I have broken racks in the winter inside at the track, not to heated. inside in the summer hot and humid. also broke them at vineland in the summer outdoor. sign me up for the aluminum rack, it and the shock caps are the only parts i really break. i think i broke a pivot block once.
![Nodding](https://www.rctech.net/forum/classic_images/smilies/nod.gif)
#3374
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3 racks and 2 shock caps and one pivot blaock aint to bad for 7-8 months of driving the car. Vineland was a rough track and ate up a rack, shock caps have happened from other cars and me. 1 pivot block from hitting the wall coming down the straight. not much breakage. with the new rack and my new towers i should be good to go. i think i broke a rear shock tower when someone landed on my car off a jump.....hacks....