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Old 10-11-2010, 08:16 PM   #1
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Default Basic setup tips

Just wanted to start a thread to ask some "general" setup tips that could help more than just myself.
Steering: Is there a such thing as "differential" for the steering? For example, if the wheels are turined to the right, the R wheel turns 30 deg while the L only turns 25 deg (or vice-versa). If so, what's the proper term and what purpose does it have?
Thanks
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Old 10-11-2010, 08:34 PM   #2
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Quote:
Originally Posted by Missle View Post
Just wanted to start a thread to ask some "general" setup tips that could help more than just myself.
Steering: Is there a such thing as "differential" for the steering? For example, if the wheels are turined to the right, the R wheel turns 30 deg while the L only turns 25 deg (or vice-versa). If so, what's the proper term and what purpose does it have?
Thanks
It's called Ackerman. The basic purpose is to allow the front wheels to turn in different radii without slipping. The inner tire turns a tighter radius than the outer tire.

http://en.wikipedia.org/wiki/Ackerma...ering_geometry
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Old 10-11-2010, 08:44 PM   #3
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Thanks CJ. I thought I had read something about that before, but wasn't sure. So now to the 2nd part of the question; what is best for 1/10 size RC cars? Do we use positive or negative Ackerman (with positive being the inside tire turns more than the outside)?
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Old 10-11-2010, 09:13 PM   #4
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Simple--you DON'T want the tires to scrub---so the inside tire has to turn more than the outside.
T
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Old 10-11-2010, 09:18 PM   #5
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How many people change the ackermann based on the average radius of the turns on the tracks they race at? Tighter turns require more ackermann.

How about if they change the toe? Adding toe out changes the circle radius slightly at full lock.
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Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car
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Old 10-11-2010, 09:34 PM   #6
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Here are some stuff that's worst a look.
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Old 10-11-2010, 09:41 PM   #7
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The Xray Setup book: http://www.teamxray.com/teamxray/sho...p?file_id=6143
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Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car
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Old 10-11-2010, 09:49 PM   #8
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Front toe out would make the car turn better on entry, but push on exit.
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Old 10-12-2010, 10:04 AM   #9
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Quote:
Originally Posted by CarbonJoe View Post
How many people change the ackermann based on the average radius of the turns on the tracks they race at? Tighter turns require more ackermann.

How about if they change the toe? Adding toe out changes the circle radius slightly at full lock.
You basically use ackerman to balance turn-in and corner exit steering.

If the car turns in too much and snatches and then pushes on corner exit use more akerman.
If the car is pushing on entry to a corner and spins on the way out or a corner use less ackerman.

Best overall setup tip i can give is that every little bit helps so if you can shave a few grams off do it. If your bearings need lobe then do them. Check camber after every meeting and that they haven't been knocked off by that half a degree in a shunt, check your droop setting haven't been knocked out. If you have any slack in the bearings, ball joints, suspension arms replace them.
All simple little things but they all add up. I would say i spend at least 4 hours on my car checking everything is just right and clean after every meet.

Last edited by YZFAndy; 10-12-2010 at 10:23 AM.
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Old 10-12-2010, 06:56 PM   #10
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This little PDF has helped me many times.

http://richardchang.com/hobby/rctips_tc_summary.pdf


Also

For a deeper understanding of what's going on with suspension tuning check this out:

http://www.stranahan-rc.com/corneringatthelimit.html
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Old 10-13-2010, 05:22 AM   #11
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Default The X-ray book is gold!

Read it, learn it, memorize it or take it with you to the track. 99% of the questions you have are answered right there.

Here's a good tip for tuning how your car gets into a corner and gets out of a corner. Droop. Read about it in the book
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