9 turn

[scottyb]

my tc3 has a 13 turn double wound modified running 3300 matched 6 cells. i am getting 32-34 mph. this weekend i am switching out to a Associated PT Modified 9T Double Motor, same battery packs and a new team associated esc to accomadate the motor. my gearing will change to the recommended ratio from team associated to keep it at 2.5 using a motor pinion gear Associated Racing Pinion Gear 48P 19T.
can i expect to push 50mph?

[tec_41]

I doubt you will hit 50, but probably 40-43mph. You could drop a tooth or 2 on your pinion for a little more speed tho.

[redheat8]

For top end your gonna have to gear higher and run a chance of heating up that motor, RED

[highroller]

The motor turns doesn't change the actual speeds. The only things that will change with switching to the 9turn is you'll notice harder low end power, if geared correctly car will seem to reach that same speed quicker. When getting on throttle car may have to tendancy to break the tires loose or be a tab uncontrollable. You need to compensate for the changes in the different motor power by using a smaller pinion at least 2 maybe 3 from what the ideal gearing would have been when using the 13x2.

Since you say speed are only around 35mhp which is roughly the speeds I reach with a stock 27turn Midnight 2 the setup you used with the modified is off. For Modified I use a 78 spur, 75 for stock to get the right rollout so my hunch is either the pinion is to large or a bit too small - actual gearing may be about 2 teeth higher than the Reedy recommendations. To see what is the actual best pinion/spur combo go up one tooth (if motor temperature is warm) look for quick, smooth acceleration - on a straight part of track (if racing) car so be a top speed before the end of straight - if it looks as though it's slow or never reaches full speed (pinion is too small) or develops a burst near the end of straight it's overgeared. Another thing to do is use a spring tension that provides proper tension (doesn't allow brush to bounce as motor reaches higher rpm ranges), motors than may reach rpms level abouve 25,000 (any type stock, 19 turn, mod) use a purple/red or two purple springs.
Once gearing and spring tension is right car should run strong right up until battery starts to dump - if car tends to fade after 1-2 minutes then it's gear or spring tension being to light that is the cause- you will notice the brush wears quicker.

For bashing stay within the 12-14 turn double range with 3000 or higher capacity battering 16-17 for those less than 2000 if you want decent runtime.
For racing situations the track layout (amount of traction), how good batteries are is the basic method of selecting which turn or wind to use. Yes while I said it doesn't change the actual speeds so why would one racer use a 7 triple while another using a 9triple. The 7 turn while obtaining the same speed has the 9x3 based on it's spool up would accelerate quicker than the 9x3 that would give you some benefit in a race. The problems you would run into 1. overpowering the car if traction becames an issue 2. possibly dumping sooner.