06-03-2013, 06:40 AM
Join Date: Aug 2001
Location: Tampa, FL
Originally Posted by Cpt.America
First race with the Mi5 today... practice race day for stop #1 in the Northwest Asphalt Challenge next week. The car was good, but I wasn't overwhelmed. I ran basically the stock setup, with 1.5 camber front, and 2.0 rear. The car seemed pretty fast, with a LOT of on-power steering... but it wasn't nearly as easy to drive as my Tamiya 417x (that i have an entire season of experience with)... Ran brand new tires with a TON of grip in the main, and the car became quite a bit to manage... So for now, I have to reserve overall judgment until I get a couple more race days under my belt with the car. Potential seems high.
I have a few issues with the car though.
1.) My rear shocks are leaking a bit through the o-rings. Enough so that I wont be able to make a whole race day without a rebuild.
2.) All 4 corners (feels like the shocks) "tick" if I compress the arms quickly. If I compress slowly, they are smooth.
3.) My right rear arm seems to have a bit or a bind.. or a "tick" that is a bit different then the ones on the other corners. If I take the shock off the car, the arm feels 100% smooth.. and so does the shock. (each individually) It only happens when the shock is ON the car, but I can't tell where it is actually coming from. It almost looks like the inside of the suspension arm is rubbing up against the bulkhead... but you can't feel it with the shock off the car. I'm a little stumped.
4.) By my 5th battery pack, the bolt that goes up through the caster block, unscrewed it self a turn or two. Normally that wouldn't be a big deal, but when THAT particular bolt comes out (even just a little bit) it introduces a TON of slop in your caster. So I could wobble my caster between something like 0 and 8 degrees. I didn't catch it till after the main... it was a handful to drive like that.
Hopefully I can get some of these bugs worked out before the big race next week.
I am sure you already know this but I'd suggest trying a step or two softer rear spring, leaning in the all the shocks or both.
Also, along with your change to 1.5deg camber in the front, going to a .5mm shim between the pivot ball and the top of the front hub or no shim will reduce camber gain and mellow out the steering.
You could also add 1mm shims to the arm pivot balls to raise the roll centers, reduce chassis roll and weight transfer.
Lots of possibilities!
Honestly, I think you have a good problem. I would rather have to work to make a car less aggressive than try and figure out how to make it more aggressive.
What I run: Schumacher Mi5/Associated RC10R5.1/Associated RC12R5.2/Futaba/HobbyWing/Team EA Motorsports/BSR Racing
Where I run: Florida Indoor R/C Complex/Thunder Racing/Florida On Road State Series