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Old 06-04-2014, 07:11 PM   #4111
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Originally Posted by Cadman1981 View Post
What does adding the weight in the front of the car do?
I'd tell you, but you sold your Yokomo!
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Old 06-04-2014, 07:27 PM   #4112
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But seriously, I find that it gives more overall steering if you are adding weight up front.
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Old 06-04-2014, 08:47 PM   #4113
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I'd tell you, but you sold your Yokomo!
Yeah, i do regret it a little, but it was a great offer!! haha

I was mainly asking because i see a lot of TCs adding weight in the front, and i was under the impression that doing this would make the car push a little more. Having the weight in the front means it has more inertia when trying to make the car turn, no?
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Old 06-04-2014, 09:12 PM   #4114
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Originally Posted by Cadman1981 View Post
Yeah, i do regret it a little, but it was a great offer!! haha

I was mainly asking because i see a lot of TCs adding weight in the front, and i was under the impression that doing this would make the car push a little more. Having the weight in the front means it has more inertia when trying to make the car turn, no?
The way I see it, and I may be wrong, is that when you let off the throttle the added weight will help with weight transfer up front giving you better initial steering. When you get on the throttle, it slows down the rising front, keeping more weight on the front tires longer for more on throttle steering. Of course this isn't true for all cars/scenarios. You can have too much weight up front (like a front wheel drive car) and the car will push. But with this 4wd platform, added weight up front will help balance the car better with good results. Through the years, I've noticed cars handling better with a more forward weight bias. Like when the RaySpeed chassis was released for the SD back in the day, it moved the batteries more forward. TC3, running the batteries in the forward position, etc., etc.. XRay 009 with the motor forward kit. Most modern TC's will have the battery as forward as they can get it, right behind the steering post. Anyways...

Ok, I'm ready to be shot down... hehe
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Old 06-04-2014, 09:18 PM   #4115
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Weight is added to the front because the current weight balance is more rearward.. i.e 47% front 53% rear. Adding weight to the front will help to achieve a closer 50%/50% balance, which should improve overall handling.


"I was under the impression that doing this would make the car push a little more."

I think this would occur if you were to add more static weight to the front of an already F 50%/ R 50% balanced chassis. You would have to add a lot of weight to the front to make it F 50% / R 50%. There's a reason why they only use 30 grams of weight on the front. Yokomo mechanics know their stuff. I'll ask Naoto why they use only 30 grams.
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Old 06-04-2014, 09:34 PM   #4116
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Weight is added to the front because the current weight balance is more rearward.. i.e 47% front 53% rear. Adding weight to the front will help to achieve a closer 50%/50% balance, which should improve overall handling.


"I was under the impression that doing this would make the car push a little more."

I think this would occur if you were to add more static weight to the front of an already F 50%/ R 50% balanced chassis. You would have to add a lot of weight to the front to make it F 50% / R 50%. There's a reason why they only use 30 grams of weight on the front. Yokomo mechanics know their stuff. I'll ask Naoto why they use only 30 grams.
I think you said it better. Closer to 50/50 balance.
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Old 06-04-2014, 09:54 PM   #4117
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Hahahah I could be right or totally wrong.

I would also think adding front weight will help "set" the front suspension after hard acceleration. i.e When a car accelerates onto the straight weight is shifted to the rear causing the front suspension to lift . After initial acceleration the added front weight should help with bringing down the front suspension and preparing it for the next turn(s).
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Old 06-04-2014, 10:07 PM   #4118
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I think the mechanics found the chassis' "sweet spot" when it comes to F/R weight balance. Hence why all the competitors are calling the BD7 a "Steerkomo" or whatever lol. Yes, I know there's more to the handling than just weight balance . Why hasn't Tamiya done the same? The chassis' are pretty much identical.
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Old 06-04-2014, 10:57 PM   #4119
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Quote:
Originally Posted by EDWARD2003 View Post
I think the mechanics found the chassis' "sweet spot" when it comes to F/R weight balance. Hence why all the competitors are calling the BD7 a "Steerkomo" or whatever lol. Yes, I know there's more to the handling than just weight balance . Why hasn't Tamiya done the same? The chassis' are pretty much identical.
I've noticed for awhile now, although I haven't checked recently, that Marc used a lot of weight under the steering rack. So I'm sure they know about weight bias too. I'll have to look at the times he has been struggling vs. the recent races to see if his weight is there.

Going back to the BD7, if you notice, you can only move the motor so far back and so far forward. Keeps a good balance that way.
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Old 06-05-2014, 01:33 AM   #4120
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Hi
I've been on a bit of a journey with my bd7 but with the 2014 upgrade and some carbon parts the car is really good. Question is any one running the shorter shocks? Does the upgrade significantly change the handling?
Thanks
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Old 06-05-2014, 05:51 AM   #4121
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Hi,
Do the Yokomo BD7'14 comes standard with the titanium coated shock shafts?
Thx!
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Last edited by AL1983; 06-05-2014 at 05:59 AM. Reason: Other question!
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Old 06-05-2014, 07:28 AM   #4122
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Hi,
Do the Yokomo BD7'14 comes standard with the titanium coated shock shafts?
Thx!
No
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Old 06-05-2014, 07:42 AM   #4123
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I am also wondering the short suspension issue. Our track's tracition is low but lots of xray t4s and bd7s are doing very similar lap times. I am wondering how xray will handle with the long towers and shocks or bd7 with lows. Anyone has an idea?
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Old 06-05-2014, 08:13 AM   #4124
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Interesting reading about the corner weights for the BD7, I have been wondering about these myself. I a wonder whether this is just more on the high grip surfaces that they are racing on though. I have thought about getting the front bd7 corner weights to try, it adds a lot of weight to the car though, they are quite expensive as well. I am wondering if anyone has had any success using them on lower grip tarmac tracks?
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Old 06-05-2014, 04:08 PM   #4125
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Hey,
I broke two Yokomo wheel hub's easily while tightening them, which other brands are better besides Xray (too expensive)???
Thx!
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