This is ALMOST like asking "what gear should I run"...there is NO way to answer it accurately online. Every track is different, even every motor can be different. People online can give you a general area to start but there is NO way they can pinpoint the optimum rollout.

Best bet is to ALWAYS ask the "fast guys" at your track about what roll-out they're running. Then don't be satisfied with that--do a little experimenting up and down from there because unless you're running the same motor (same brushes, same springs) etc as they are chances are even their optimum set-up isn't yours. Even driving style comes into it. Someone who treats the throttle like a switch will have to run a lower roll-out than someone who tips into it. The temp gauge (or well-calibrated finger) will tell you if you're approaching danger and the clock will tell you if you're making improvement, slowing down or staying the same.

Example. We race on a club track so we roll the carpet out for each event and create a different track each time. The straight lenght, which is pretty much always the criteria for online guesstimates, is always 65' yet my gearing runs over a 2-3mm rollout range depending how tight we make the infield. The key is figuring out where in that range to go within the, typically, one practice pack and 3 heats before the main while your competitors are too. At a permanent track once everybody has the gearing set you don't typically see big lap time drops between heats, for us it's not uncommon for the faster drivers to improve as much as .5 sec/lap over the day as they get the gearing and other set-up items dialed in on the fly. Then it's back to it for the next race. It never changes a lot so I almost always start out where I left off last race and adjust from there. I end up running Stock in the low 40's mm and 19T in the mid 40's mm and that ranges over about 3mm. On our layouts. With my set-ups. With my driving style. Add caveat of your choice here.

scottrick
1/2 page to tell the fourmula for the roll out,imagine if i asked for the compression ratio of the suspension at a givin corner,what would that be,5 pages answer,lol,very informative post though,thx

WOW, well after i calculate all that were do how do i figure out my pinion still. i guess i am asking is where does my percent want to be.

I got to start reading before i post. What i was asking was where does my final percent usally want to be around.

Good day gents.

I have an old carpet knife v 3.1.
If there are any great setups for stock that you would be able to forward to me please do so thanks.

Tight track with one long straight.

any sites you would reccomend as well would be great.
Thanks in advance.

Tuning Guide Link. Just wanted to post a link to CRC Gen-X manual and tuning guide. Pages 16-18 even though they are meant for the Gen-X they can be applied to all 1/12th scales.




http://www.teamcrc.com/crc/downloads...manual_web.pdf

Does anyone know where to get a 78 tooth spur gear? Seems everyone is out of the Robinson one. Greatly appreciate any help.

I have RW 78 spurs in stock

Great post, I dident even know a guide existed for 12th.

Hey..Can someone post a pic of the wiring job in a CRC with the brushless GTB in it?

Thanks..

Here you go. Compliments of OD.

http://www.rctech.net/forum/showpost...ostcount=23820

hey guy's I have a simple question that's alway's had me wondering. what the difference in running the servo at and angle(which I've alway done) to running it flat. What the pro's and con's of each. I know running it flat will produce bump steer( what is this excatly)

I run on a very technical track . 6' lanes i belive it is 96x36(3 roll wide and about the full lenght of a gym?? with non forgiving boards.

the car I run is a corally sp12x just gone to the L4 front suspension. presently runny a monster stock motor. if anyone have any info on setup for thie car also would also be greatly appreciated.

Running servo angled will add ackerman to steering, which gives you more steering. If you want your car to have less agressive steering, you should lay your servo flat. Usually it's flat on high traction and angled on low traction tracks. Bump steer you will have if you wont even out the steering links paralel to chasis, you can do that putting longer ballstuds on the steering spindle. Bump steer steels you the corner speed.

cyrrus,

My son Jeff just ran the 12x WC (L4 front end) in Cleveland and the car was very good with the following setup:

-Jaco double pink front tires, yellow rear tires
-1.6mm T-bar, no center screw, with some stiffeners added to increase side-to-side stiffness
-flat mounted servo with longer ball studs on steering arms to flatten links as Uga suggested (chassis cutout needs to be added for servo saver)
-silver center spring with 30wt shock oil
-.020 in front springs
-10 degree reactive caster blocks with 2 spacers rear and one front
-Corally red lube in dampener tubes

Jeff will be adding complete setup information on the CorallyUSA website shortly for Tosolini's car (1st place modified in Cleveland), Ellis' car (TQ stock in Cleveland) and his own (ended up 13th qualifier, about 0.6 sec out of the A). You also may want to check out the 12x thread on this forum for additional advice.

both you guys' I have to say. thanks, you explained it to me very good and both helped me thanks.