Thread: Hyper 7 on 5S
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sleebus.jones
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Posts: 650
Join Date: Dec 2005
Location: Houston, TX
12.04.2007, 09:31 AM

I need to shoot another vid, because if you thought it launched hard before, you should check it out now!

What was happening on launch is that it would pick up the front wheels, the diff would spin the front tires up to full RPM, unloading the back, which allowed the front to drop and hit the pavement at full RPM...which transmitted a ton of shock load to the spur. The end result was that it sheared 2 teeth off the spur and folded the 3rd over. The spur I was running was the 46T Kyosho plastic spur.

So, it was time to put the hardened steel spur back on. I have a hardened pinion, so that wasn't a problem. Also, the Kyosho never sealed up quite right, and leaked, so I wasn't able to keep any fluid in the center diff.

So, I pulled the Kyosho off, filled the diff with 10K fluid and put the steel one back on. Even tho I was able to use fluid in the diff now, I was kinda bummed because I liked the quiet of the plastic spur, and I had heard the steel ones were noisy.

Guess what? Not noisy at all. I was expecting it to sound like a buzz saw, but it was just as quiet as my plastic gear. Maybe an extra zzzzing every now and then, but man, I should have made that change LONG ago.

Going to the 10K fluid helped a lot too. The wheelies are not as high now (which I kinda thought would be the opposite) and MY GOD does it accelerate out of the hole. It appears to reach about 80% - 90% of top speed in about 4 - 5 feet. It's really amazing to watch it launch. There's just enough rear bias now that I can drive the rear end around with throttle on concrete. It feels really good. Now I'm even MORE anxious to get this thing on the track, or at least off-road a bit.

Sleeb
   
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