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Old 02-10-2010, 01:32 AM   #1
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Default What are the pros and cons of balancing a car the XRAY T3 way?

As most of you probably know, XRAY came up with an easier way of balancing the T3 by being able to position the motor, esc and receiver in a certain position and the battery in a certain position, based on the type of battery being used. While additional weight is required for final balancing, XRAY says that it only requires perhaps 30g or so to balance the car.

On the T2'008, T2'009 and T2R Pro, they came up with a LiPo 4 weight balancing set, which would still require some additional weight for final balancing.

More recently, XRAY added the LiPo chassis weights that fit in the battery slots to assist with final balancing.

My question are:

- What do you guys think of the T3's balancing technique?
- What are the pros and cons to their approach to balancing the T3?
- What do you think of the T2 LiPo set approach to balancing compared to the T3 way?
- Do other manufacturers have a better approach to balancing their car?

Thanks!

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Old 02-10-2010, 06:56 AM   #2
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I would say less weight to balance, the better as long as the car meets minimum weight requirements where you race. The T3 is a wonderful way to balance the car but there are still minimum weight requirements that may require add'l weight anyways. With whatever chassis you own, as long as the car is right around min weight and is balanced left to right, it should be good.

My .02. Subscribed to read other ideas.
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Old 02-10-2010, 08:54 AM   #3
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Balance is one thing, but MASS has to be taken into consideration.

For example, you can continue to move a light LiPo outward until the car is balanced, but the car will still have unique handling.

Weight = MASS x gravity.

When a car is cornering very hard, the mass is more subject to centrifugal force outward rather than downward which gravity has its effect.

Therefore, the new 12g and 6g HUDY balancing weights is the best way to counter-balance the mass of the motor.

BTW, the HUDY weights are now available. Your LHS should be able to order them today. The part numbers are #293090 and #293091 for the 12g and 6g respectively.

http://hudy.net/flash_stuff/all_in/index.htm
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Old 02-10-2010, 09:08 AM   #4
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All else being equal I prefer adding weight as low as possible. With Lipo these days, the batery has a lower density than lead/steel/brass etc. so I prefer the weights to go under the battery. In the past I made my own trays out of lead and slipped them in the slots, under the battery. I found though that I need to add more weight than I need to bring the car up to the limit just to balance the car left to right so my car is about 30 grams overweight.

When balancing the car remember that a small weight further from the centre line is going to balance a heavier weight closer to the centre line.
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Old 02-10-2010, 09:09 AM   #5
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We run our track snowbirds style (counter-clockwise). We have a sweeper on the end of the straight. Due to the non-symmetrical style of the T3 chassis (wider to the lipo side) the chassis drags on that side. The car seems to balance and handle fine but that is the con I see to that approach.
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Old 02-10-2010, 09:28 AM   #6
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Quote:
Originally Posted by TeamB&B View Post
Balance is one thing, but MASS has to be taken into consideration.

For example, you can continue to move a light LiPo outward until the car is balanced, but the car will still have unique handling.
So is it better to mount the Lipo as inward as possible on the chassis to negate these effects of gravity on the pack during hard cornering?
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Old 02-10-2010, 09:42 AM   #7
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Quote:
Originally Posted by Dane View Post
So is it better to mount the Lipo as inward as possible on the chassis to negate these effects of gravity on the pack during hard cornering?
We have our T3 configured like this.

- LiPo (Thunderpower 5000/40C) mounted in the standard location

* Slot 6 is toward the rear of car.
Slot 6 - HUDY 6g furthest away from C/L.
Slot 5 - HUDY 6g furthest away from C/L
Slot 4 - HUDY 12g furthest away from C/L
Slot 3
Slot 2
Slot 1

Then we have about 28g (4x 7g) of weight down the front middle of the car to bring the weight up to 1425g. We run about 5g heavy just in case we take out the front brace and sway bars for on track changes.
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Old 02-10-2010, 09:49 AM   #8
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Quote:
Originally Posted by Dane View Post
So is it better to mount the Lipo as inward as possible on the chassis to negate these effects of gravity on the pack during hard cornering?
i think it should be better overall with the LiPo outside of the chassies by about 15% so the weight transfer isnt only on the left side of the car. it should be like that anyway.........



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Old 02-10-2010, 01:21 PM   #9
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Use HUDY Weight !
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Old 02-11-2010, 01:02 AM   #10
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Thanks guys! Lots of good info.
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Old 02-11-2010, 06:50 AM   #11
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Anyone know where I can purchase some of the LiPo Chassis balancing weights in the US? I'm not having any luck finding them.
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Old 02-11-2010, 08:41 AM   #12
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Quote:
Originally Posted by lowcel View Post
Anyone know where I can purchase some of the LiPo Chassis balancing weights in the US? I'm not having any luck finding them.
Doesn't look like the usual suspects even have them listed in their online catalog. Try contacting RCAmerica and see if they know...
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