It is actually for an xray TC. But 1/12 scale guys usually know more than TC guys. Just wondering if any of you have heard of one. I can't bring myself to shave .15 inches off $40 of touring foams. I'm gearing about .08-.12 inches too long right now and need a bigger spur.

BTW, I also run a 1/12 CK.

Sands

oh yeah, that last post was the explanation for me looking for a larger than 128 /64p spur.

Sands

You probably want to true those tires down anyway. Normally on sedan I cut down to 2.30 before I even run them, and I shave off normally .1 on my 12th scale tire as well. Cars normally do not run well with large tires, it is like having large sidewalls on a full scale car. The car will scrub alot of speed in the corner and handle funny since its digging in, instead of floating ontop of the track.

you're probably right. Last season of on road that I ran was about 10 years ago. Back then we only had green and blue and a couple of other compunds. Green dots would only last about 4 race weekends. It seams as thought the purples and greys will last 1/2 season with practice thrown in.

I'll probably true them down so I can run the smallest pinions that will fit in the Xray comfortably. (The belts will hit the motor if you go too small)

sands

Sands

When I accelerate from a slow speed or from a dead stop my car spins to the right. Usually not very helpful when you make a mistake and slow way down and than accelerate too hard and swing into the boards again ;) . I was thinking I could try going up on a pinion tooth, or mabey try green springs on both sides of my motor. Currently I'm running a monster stock with red +/ green - spring combo. Very fast. But the acceleration is almost too good. What do you guys think?

Guys,

The new Trinity 12th scale is a BAD MUTHER. Saw Doseck's car and it is DIALED..................... Looks super trick.

speedxl- Thanks again:nod: for the set up insight car worked good. If I could've kept it off the pipes:cry: I'd have had a better chance. Took second in the"A" (stock).

thanks...i never know how to read these charts...it gives me all these roll outs but which one should i really use?

thats true...but for us college boys...every single penny counts...so im just gonna run my tires down till its so small i cant pass tech

xraycer congratulations i figured you would like the setup wasnt it smooth
you might want to try a stiffer front sring if traction were to come up on the track and you start traction rolling like .22 .
other wise that set up i gave you is a good starting point were ever you go and all you have to do is minor adjustments if conditions change.


another happy prc quad 12 driver good job xraycer!:cool:

DX6,
 

Check your diff for smoooooth and make sure your rear end is centered onthe back of your car. Wheels should be exactly the same distance from the center of the car. You can't have too much stock motor.

Racer DX
your car is probally tweaked, what kind of car do you have,
tweaked means one of the rear wheels have more weight on it than the other

Casey

There are a number of slides, each one is for a different spur gear. The left hand column is tire dirameter and the top row is spinion size. The middle of the matrix is the inch rollout. For tight tracks you want to be in the 0.7-0.85 range, for fast tracks from 0.8 to 0.95 ish. You need to do this from experience and what kind of motor you run. GM3s will be geared much shorter than a P2K2. Depends on where the power band is on the motor.

Anyway, measure your tire diameter, this will give you the row to look at. Then pick the rollout you want to run. You may need to look at different pages to pick the right spur gear. Once you find out where you want to be with the spur you want to run, then pick the pinion to match. With newer grey dot rears, they will wear very slowly. You can probably stick with the same pinion and spur for one race day. If you true between races, then you'll need a different gear combination to stay at the same rollout.

These charts let you run the same rollout for different tire sizes. So as your tires wear, your car will accelerate the same and have the same run time.

This is one of those details that you need to pay attention to in order to be competive on 1/12 scale class. Oh, yeah, run consistent lines and don't crash, that helps too. LOL

Sands

BTW, the rollout chart is on page 146.

Sands

I have a Carpet Knife 3.1. But I'm sure it's not that the car is tweaked. Because I just set it right before I ran the last time. But the car will only spin to the side when I accelerate hard from a dead stop or slow speed. But drives straight all of the rest of the time. I'm pretty sure the rear wheels are just slipping. But I will check the tweak and everything next time I run. But I'm pretty sure its not that.