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Old 04-08-2009, 06:32 PM   #10396
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Originally Posted by bigkoitat View Post
I've figured out the majority of my problem, I didn't see the part in the instruction on shaving the chassis where the servo horn hits This made a huge difference!! Also on the steering rack I noticed the balls hitting the rack arms itself, so I c-notched it a little and now I have the same amount of steering as my 416.

Make sure you don't have the arm incorrectly installed, that will cause it to hit
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Old 04-09-2009, 04:07 AM   #10397
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Originally Posted by 1101 View Post
Hi there. Ive a IFS-R running silvercan motor.
Ive a big problem with the car turning sharply at full acceration, doesnt allways happen but often enough to make it undriveable at any more than 1/2 power.
Update:
Thanks for the replies.
Changed the esc: swerving problem solved.
Who'd have thought it, I chased many a red herrings on this one.

I scoped up the the power at the servo & RX, hardly clean, lots of glitches in the +ve when blipping the throttle.
======================================
Could this caused by the infamous static issue ??

http://www.tamiya.com/english/info/070522.htm
"Some R/C cars may experience mechanical trouble or out-of-control driving due to sudden discharge of static electricity.

We have discovered that the component layout of the TA05-R Chassis Kit (ITEM 49418) makes it relatively vulnerable to the scenario described above, if used with a metal-geared servo under certain conditions."

Last edited by 1101; 04-11-2009 at 07:15 PM.
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Old 04-11-2009, 04:16 AM   #10398
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Here's another blog that deals with this

sosidge.com/category/tamiya-ta05-r
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Old 04-21-2009, 10:14 PM   #10399
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Ok So I have converted the spur gear to normal 48p
gears. I have a 17.5 LRP motor. and a 13.5

What pinion should I use with these 2 motors?

Is there somewhere I can look which will help me to understand the final drive ratios? I have no idea what I'm doing in this area.

thanks
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Old 04-22-2009, 01:25 AM   #10400
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Originally Posted by Smileyboy View Post
Ok So I have converted the spur gear to normal 48p
gears. I have a 17.5 LRP motor. and a 13.5

What pinion should I use with these 2 motors?

Is there somewhere I can look which will help me to understand the final drive ratios? I have no idea what I'm doing in this area.

thanks
For starters, it depends on:

- what size spur you're using
- whether your track is tight and twisty, or open and fast.
- how good your batteries are
- how long your races are.

Talking about gear ratios in terms of pinion/spur can be deceptive - the final drive ratio and tyre diameter also have effect (and some tourers have very different final drive ratios). This is why most racers will talk of "roll-out", which is how far the car will move forward for every motor revolution. This way, if someone says "A Novak 17.5 will handle a roll-out of 35mm around here", you can use this to work out exactly what pinion you need to get this roll-out for your spur/final drive/tyre specs - its information that isn't specific to any particular type of car or tyre choice.

A Google search for "rc roll-out" should get you plenty of info. If if still isn't clear I can post a thorough explanation for you.

You'll find a good roll-out calculator here:

ausrc.com/forum/showthread.php?p=227604

Now all you have to do is ask the locals what the appropriate roll-out is at your track for your size/type of motor, and then start from a slightly more conservative gearing than that. If the motor isn't too hot after a few laps then try adding a tooth or two at the pinion, but keep an eye on the motor temp - you don't want to cook it!

Most of the quicks at my twisty local track are putting back 1000-1300 mah into their packs after a 5 min race. Obviously, you need batteries that are of a high enough capacity to cope with the kind of drain you'll asking of them, or you'll be fading at the end of the race. 1900 NiCds just aren't going to cut it...
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Old 04-22-2009, 05:40 AM   #10401
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Here is another online app for calculating gear ratio: http://www.gearchart.com/index.cfm?f...n=chart.create
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Old 04-22-2009, 08:05 AM   #10402
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Thanks, That helped a lot. That was a good explination.
i will do some searching on the G today.
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Old 04-28-2009, 10:53 AM   #10403
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Wrenching.... I need some help. I took the car to the carpet track today. I am running Jaco Blues, the tires did well until coming out of turns. I was sliding all over the place. ANy suggestions on what the issue could be?
Do I need to install swaybars, different shock oil.... I don't know.
I'm new to onroad.


thanks
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Old 04-28-2009, 10:36 PM   #10404
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I assume that the rear breaks away as you power up coming out of the turn. If that is the case, then here are some suggestions:

- Lower rear ride height
- Increase camber on the rear wheels
- Softer rear springs

Remember that any adjustment you make to the rear will affect the overall handling of the car.
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Old 04-28-2009, 10:44 PM   #10405
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It breaks away/ takes the turn wide on exit.
I am using the stock shocks too.
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Old 04-29-2009, 07:24 AM   #10406
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Quote:
Originally Posted by Smileyboy View Post
It breaks away/ takes the turn wide on exit.
I am using the stock shocks too.
where do you have the droop set at?
you could try putting a quarter turn of droop in the front to allow the weight to transfer to the rear on acceleration
are you running any toe in in the rear?
that would also help to keep the tail from wagging
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Old 04-29-2009, 06:14 PM   #10407
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Here's a good, simple tuning guide to get you started in the right direction:

http://homepage.ntlworld.com/terry.c...ll/covell.html
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Old 04-30-2009, 07:38 PM   #10408
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Or look at http://users.telenet.be/elvo/ to learn about what is behind car handling.
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Old 05-01-2009, 10:34 AM   #10409
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This is my personal favorite document for understanding tuning and setup: http://www.teamxray.com/teamxray/new...wnload%20Files

Select "Xray T2 Set-up Book"

It's called Xray, but the principles descriptions and principles apply to
all chassis.

Last edited by Geppetto; 05-01-2009 at 10:51 AM.
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Old 05-04-2009, 07:44 AM   #10410
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Thanks for the tunning help. I worked great this weekend for racing.


My stock tamiya springs are too long and hard for the track. So i need to order some different ones.
Where can I find a good price on Tamiya on road spring set and or a set of the TRF shocks?

thanks
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