TA04-R gearing advise please ?

[egaiski]

Yesterday I competed my TA04-R on a 540 silver motor level and I lost heavily, 23rd on a field of 27 drivers...my car ate dust all the time especially on straight. I am sure I have a gearing problem.

On my last (5th) race I used 85 spur and 37 pinion (48 pitch) which is a total rollout of 40.39 on my calculation. I found the car a bit faster than my previous heats which I ran rollouts of 36-37.

Soon,I will be running my car again on 540 and 27T Stock motor on the 'same track' with lots of turning. I have tried different combinations and I still could not get my car fast/quick on exiting turns and a acceptable top speed on straight. I have tried using 48 pitch instead but no luck still.

Some advised me to get a rollout of 40-42 for 540 motor, and 29-32 rollout for stock.....but it seems I could not make my TA04-R acceptably fast enough on both ways compared to other cars which is running the same motors but not sure what car they have. But I have full confidence that my TA04-R can compete because of its racing capabilities. It's just me I guess )

A friend of mine told me to get a front one-way which i will get. Will this do the trick?

Here's my car specs.

TA04-R

540 Silver can motor ... and 27T Epic Pro Stock

F/R tyres Sorex 32/28

F/R Suspension 60wt/40wt Blue/White Springs

3600 Bats

Novak GTX

XS3Radio with digital servo

Any advise/recommendations will be greatly appreciated guys.

Desperately,

Edgar

BTW that was my first true competition and as I consolation I won 1st place for my job on body shell. A very simple one color paint job )

I did no use my original carbon fibre look Altezza, instead I bought the stock Altezza body and painted it with one color only.'Pearl' lime green (bit yellowish) and its decals,really stood out from the pack rounded sedans. I will post the picture later.

Cheers

Edgar

[tt-01owner]

maybe you should time your lap times with different spur and pinion combinations, and then use the combination that had the lowest lap time, thats what go kart racers do.

[tt-01owner]

your epic motor would be way faster, cheer up, i bet david jun lost like you when he raced the first few times

[Backlash]

OK, where to start. Have you raced before?? IMO, for 540 racing you need to have a very efficient car, and a very efficient driving style.

As for efficient driving style, you need to be smooth, and precice to be fast. Jerky or sudden steering movements, slowing down for corners, will all make you seem slow.

As for the cars efficiency, remove the motor and see how free the cars driveline rotates. Check all Bearings to ensure all are rotating free, and none are seized. Check belt tensioners that they are not making the belts to tight, or for 540, remove them all together, I doubt a 540 has the power to skip the belts on the gears. Im not sure of the internal ratio for the TA04, but Id be looking at a ratio from about 5:1 to 4.5:1 on the rubber tyres you specified. This is based on what the 540 drivers run in our club, and we race on a netball/basketball court. Basically your motor will be to hot to hold when youve finished your race, But not smoking.

To get your ratio, Divide the spur (85) with the pinion (37) and then multiply this by the internal ratio of the car ( 85 / 37 X internal ratio = final drive ratio). If the 37 pinion is the biggest you have, put a smaller spur gear on. This will do the same as going up 2-3 teeth on the pinion (motor).

Keep in mind that not all 540 motors are created equal, try a different motor. Have you thought of the obvious?? Is you ESC tuned in correctly, and are you getting full speed? Its just I had this happen to me and I run the same radio as you.

A one way will not make your car faster in a straight line, It can allow you to corner a little quicker though.

Congrats on winning best presented car, and goodluck.

[egaiski]

Thanks for replying guys

Backlash, I've been running Touring Nitros before but only on social games on a decent track. I guess I am a behaved driver, good but not the best )

My Ta04 is a rolling free car. Belt tensioner and bearings are fine.

Ta04 internal ratio is 2.133 ...on 85/37 gear equates to 4.9 fdr.

Yesterday, i dug the Ta04 pro recommended gear ratio from the net and tried the 128/37 (64pitch) and tried it, looks more punchy now though I haven't full tested it on the track and I will this weekend.

128/37 gives 7.38 fdr

Last night, I borrowed my friend's Indy Dyno to test the RPM of my 540 on 7.2 volts shown 16800 max rpm..I further burnt it for 1.5 hours on Indy Dyno and now it gives 18000 max rpm.

[Backlash]

Goodluck. I hope it all works out for you.

I wasnt trying to insult you by asking if youd raced before, its just that if you had have answered No, I would have told you the same as I would have told anyone, That everyone has to start somewhere, and your time would be better spent learning to drive around the track smoothly and without Crashing, than worrying about how fast your car is or isnt. Theres no point having the fastest car out there if you cant controll it.

You do understand that a 7.38 fdr will be slower in a straight line than a 4.9 fdr dont you. 7.38 fdr sounds more like a rebuildable stock ratio for a smallish track, not a 540 ratio. Be careful, some countries/ parts of the world refer to different motors when saying stock.

How long is the straight at your track?? This is the part of the track where you said you were "eating dust" wasnt it?

Did you check to see that you are getting full speed from your ESC. Put the motor in the dyno, connect it through the ESC and at full speed, see if you are still getting 18000rpm at your motor.

[egaiski]

Backlash, that's OK. I understood what u meant )

I will find out how long the straight is. And if 7.38 fdr is still slow on the straight, I will have to lower the fdr number isn't it?

Where is the ideal part of the straight should the top speed kick in?

Hmmm never thought of putting it in dyno with ESC, thanks dude I'll try it tonight.

Cheers

[Backlash]

Yes, By lowering (number ratio:1) the FDR, the faster you will go, but the slower it will accelerate.

The ideal place to hit top speed on the straight?

Ideally you want your car to hit top speed as early as possible, but not be that slow that when you do hit top speed, you then get overtaken by the other cars.

Id guess that hitting top speed about 1/2 to 3/4 of the way down the straight would give you a reasonable balance of acceleration and top speed. Remember that most tracks have some kind of a turn at the end of the straight, so in the last 1/4 or so of the straights length you will be wanting to line yourself up for the corner, and maybe even slow down a little so you can make it around clean. It does really depend on the track.

Dont worry to much about it, it will all come to you in time. Coming 23rd out of 27 on your first outing is nothing to complain about. Just remember one thing, HAVE FUN. If your having fun, then winning wont matter as much.

[egaiski]

I see. I'll experiment the best FDR on the track (especially on the straight)

That's exactly what I am doing, just to have fun )..and having a competitive car and the thrill of tailing the lead car is awesome, winning the race is a bonus.

btw, tested my 540 again with ESC...no problems at all...actually it hit 19800 rpm..so I checked the voltage output from my ESC 8.0 -8.05V....and I tested it again on Dyno @ 8.0V without esc, 19600 max..so I assumed my speedo is giving the max output.

Thanks once again

Cheers

*** 18000 rpm was tested @ 7.2V ****