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Old 11-16-2015, 10:43 PM   #6331
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The Yokomo BD series have always had 40/20 gears as far as remember. Interesting that they changed it for 2016. Looks like a good car.
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Old 11-16-2015, 10:51 PM   #6332
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First BD7 was 13
Still my favorite asphalt chassis

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Old 11-16-2015, 11:21 PM   #6333
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Quote:
Originally Posted by niznai View Post
When did it change? The first BD7 (2014) had 41 tooth diff crowns. Did it change when the new diff came out? That's probably the smallest diff tooth count on the market right now (and seems pretty small at that).
Personally I prefer an irrational internal ratio otherwise you'll have the same tooth and the same belt tooth running in all the time. Something like 19/37. Even these have at some point a common multiple, but in my opinion it's better for longer lasting drive trains.
First BD7 was introduced 2013 and it has always been 40T/20T pulley. Also there are many other brands with lower IDR and smaller pulleys. Not sure where you are getting all of this info...
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Old 11-17-2015, 12:16 AM   #6334
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Are you sure it's tightness and not some bonding solution? You might be able to use acetone and let it sit for a while to make sure the bonding agent is dissolved. Or if you want to avoid losing the colour, you can try freeze and release, it's liquid nitrogen in a can. Spray the bearing and it should drop out.
Yes could be some bonding agent too. Acetone would probably harm the blue ionisation. 'Freeze and release' is a brilliant idea though. Didn't cross my mind. I'm sorted now but its good to know for next time. Thanks for sharing.
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Old 11-17-2015, 01:58 PM   #6335
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Default which BD7 to choose

hi,
I`m offroad guy who is going to try my luck at touring cars during the winter
I wish to get used BD7...as Yoko parts are easy to get, but could somebody tell me if its remarkable difference how BD7, BD7-14 Blue and BD7-14 Black editions performs on high grip carpet tracks?
Wish to start with used car- with limited budget for the test car, but if its remarkable difference between those above, then I will try to get best from those.

Any advise is welcome

and if somebody from Europe sell their BD7 I`m waiting your offers at pm.
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Old 11-17-2015, 02:08 PM   #6336
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Originally Posted by hardijs View Post
hi,
I`m offroad guy who is going to try my luck at touring cars during the winter
I wish to get used BD7...as Yoko parts are easy to get, but could somebody tell me if its remarkable difference how BD7, BD7-14 Blue and BD7-14 Black editions performs on high grip carpet tracks?
Wish to start with used car- with limited budget for the test car, but if its remarkable difference between those above, then I will try to get best from those.

Any advise is welcome

and if somebody from Europe sell their BD7 I`m waiting your offers at pm.
BD7 13 great for asphalt

BD7-14 Blue and BD7-14 Black edition; these are the same aside from color
With aluminum chassis is great on carpet, 15, 16 should be even better, but 14 is a weapon anyway
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Old 11-17-2015, 02:39 PM   #6337
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BD7 13 great for asphalt

BD7-14 Blue and BD7-14 Black edition; these are the same aside from color
With aluminum chassis is great on carpet, 15, 16 should be even better, but 14 is a weapon anyway
Thank`s a lot for this info!

So I`ll search for BD7-14.

Any offers from Europe are wellcome
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Old 11-17-2015, 04:30 PM   #6338
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I currently have the '14 bd7 and love everything about it. Good luck on your winter season!!

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Thank`s a lot for this info!

So I`ll search for BD7-14.

Any offers from Europe are wellcome
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Old 11-17-2015, 07:33 PM   #6339
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First BD7 was introduced 2013 and it has always been 40T/20T pulley. Also there are many other brands with lower IDR and smaller pulleys. Not sure where you are getting all of this info...
From my own cars. True, I miscounted the diff.

Smaller than a 34 pulley? What are those brands?
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Old 11-17-2015, 07:36 PM   #6340
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Yes could be some bonding agent too. Acetone would probably harm the blue ionisation. 'Freeze and release' is a brilliant idea though. Didn't cross my mind. I'm sorted now but its good to know for next time. Thanks for sharing.
There is a risk with freeze and release as well, because the parts being so small, they may shrink equally. The colour shouldn't be affected though.

With heat, you might also try a heat gun, that should be a quick one, but again, I am not sure if the colour would be affected or not.
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Old 11-17-2015, 07:39 PM   #6341
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Which one? Cranks or rack?

Never mind, they're all replaceable, you just have to fiddle a bit.
both crank and rack, is there any trick to easily get them off?
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Old 11-17-2015, 07:42 PM   #6342
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They are replaceable but rather hard to remove original ones especially if you do not have a press. They fit tightly! New ones will slip in no problem once you remove the original ones. I had to heat mine to get it off. Be aware once you heat you will loose the blue ionisation colour - it will turn silver! Good luck.

P.S. I changed bearings on mine as I needed a quick repair, but ordered the new steering parts and had them replaced anyway. its up to you though.
How u heat it? With a tourch or hot air gun? Can I boil it in the water?
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Old 11-17-2015, 10:55 PM   #6343
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Hello! I'm seeking some advice on gear differential oil for high traction (Yatabe Area) with a 13.5 boosted motor.

My current setup is 10k for my low-medium grip track. However, I am a little skeptical that the differential oil might be too hard for high traction surfaces. Where should one start? I have three gear differentials to test.

What oil range should I test within?

3k
5k
7k

Or do you think 10k will be fine?

Let me hear your thoughts and suggestions.
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Old 11-17-2015, 11:04 PM   #6344
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7k 1.2grams.

The volume of oil is just as important as the viscosity. 10k is too thick for most carpet tracks like those with many sharp and 180 deg turns. I used 5k 1.5grams but it takes too long to come up to temp and the handling change is drastic when it does.

I think the new '15 diff is a step backwards from the old BD-5/7 diff.
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Old 11-18-2015, 12:46 AM   #6345
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Quote:
Originally Posted by policeman0077 View Post
both crank and rack, is there any trick to easily get them off?
Put them in an electric oven at ~200degC. The alloy will expand more than the steel bearings and the bearings will just fall out. Shouldn't harm the anodizing either.
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