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Old 07-04-2013, 02:51 AM   #1906
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Zaraz, I'd steer clear of the 502 ball diff, as its designed for off road use and abuse it will likley be a lot heavier (outdrives prob made out of steel as opposed to aluminium).

Myself and team mate had the SpecR diff in our cars, but when throttling up just on the bench in 17.5t blinky, although smooth, the diff wobbled and bound the drivetrain a little. The plastics on the SpecR are not great and the outdrives aren't a great fit. We weren't happy running it so went for a full MS ball diff, this was very smooth and a lot quieter in the car which means its meshing nicer and giving you a smoother transmission.

Hopefully Tamiya will come out with a gear diff for the 502 and we can mix and match parts to get a reliable gear diff for the EVO...come on Tamiya!!!
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Old 07-04-2013, 07:04 AM   #1907
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thanks, I was going to order the spec r , but will just order the Tamiya diff instead
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Old 07-04-2013, 08:03 AM   #1908
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Quote:
Originally Posted by Chrissy C View Post
Myself and team mate had the SpecR diff in our cars, but when throttling up just on the bench in 17.5t blinky, although smooth, the diff wobbled and bound the drivetrain a little. The plastics on the SpecR are not great and the outdrives aren't a great fit.
I noticed this as well with mine. I thought it was because they were used when I got them. This doesn't sound like it's because they are used. It's not horrible, but it's not great either. It makes the cvd's vibrate more then it should and that makes it not as efficient as it should be. I notice it more in the front with the 200k+ oil then in the back with 1k-3k oil.
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Old 07-04-2013, 01:25 PM   #1909
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I contacted fiberlyte to see if they will make some lipo holders, I will send them measurements and see how much it costs, will post up price soon, I was hoping exotek would make lipo battery holders to use with the stock chassis, lets hope
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Old 07-05-2013, 07:54 PM   #1910
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If you are willing to do a little light machining and happen to have an Awesomatix laying around, there is a more precise solution to the gear diff issue.

It's not going to be cheap, about $200 in parts but....

You will need to machine down the stock input shafts to fit inside the hollow Awesomatix gear shaft and add a hole for a pin. Then us a sleeve like the A700 as a pin retainer. Of course you will need to do both ends as the gear ratio changes to a much friendlier stock ratio of 2.08.

Right now it's all just "theory" but it should work! I might machine a set up tomorrow while I'm at work to put it to the test.

Normally I wouldn't throw something like this out there without having made it work, but just in case I don't pursue it I wanted to get the idea out there.

Mike Slaughter
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Old 07-05-2013, 08:01 PM   #1911
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Quote:
Originally Posted by masterhit View Post
If you are willing to do a little light machining and happen to have an Awesomatix laying around, there is a more precise solution to the gear diff issue.

It's not going to be cheap, about $200 in parts but....

You will need to machine down the stock input shafts to fit inside the hollow Awesomatix gear shaft and add a hole for a pin. Then us a sleeve like the A700 as a pin retainer. Of course you will need to do both ends as the gear ratio changes to a much friendlier stock ratio of 2.08.

Right now it's all just "theory" but it should work! I might machine a set up tomorrow while I'm at work to put it to the test.

Normally I wouldn't throw something like this out there without having made it work, but just in case I don't pursue it I wanted to get the idea out there.

Mike Slaughter
Wish it wasn't such a spendy upgrade with machining involved.... But oh my that looks sexy.... I assume the normal shaft and gear doesn't mesh using that gear diff correct.

Last edited by Travis S; 07-05-2013 at 08:22 PM.
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Old 07-06-2013, 04:31 AM   #1912
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Is there a reason why everyone wanted a gear diff (other than ease of/minimal maintanence factor?). I don't think anyone will be running mod with these cars so a ball diff should suffice for 17.5 to 25.5.

I'm planning to be using a ball diff with the modified 502X gear set.
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Old 07-06-2013, 07:59 AM   #1913
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Quote:
Originally Posted by TenzoR View Post
Is there a reason why everyone wanted a gear diff (other than ease of/minimal maintanence factor?).
Ease of use and very low maintenance for sure. For me it's like going from a brushed motor to brushless or 6 cell batteries to lipos.

There are not many shaft cars with an option to run gear diff's I am only aware of 3 shaft cars that can use a gear diff. A700 (2 rich for my blood.), TB03 (doesn't have a lipo carbon chassis, EVO 5 (runs the tb03 gear diffs but has an updated lipo chassis kit) and that is the reason I went with this car.
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Old 07-06-2013, 09:21 AM   #1914
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Due to work limitations I will not be able to race my cars I just bought so putting them for sale, I bought this car
TB Evo5
so basically selling the same car with everything listed and same in the picture fo what I paid 500 usd shipped in candaa or us
I also have a brand new in box tb evo v, with exotek chassis new, 600 usd shipped in canada or us
I also have the folowing
tamiya aluminum and tit screw kit new in package
502 diff gears x2 new
all the parts to make a diff, thrust bearing, screw and nut, spring, all x2 and new
new aluminum servo holders
new suspension spacer blue tamiya
paypal only, I can sell these with the kits the parts, let me know thanks
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Old 07-19-2013, 03:10 PM   #1915
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So I had a little time to play around with my Exo Evo and came up with a little mod. I was re-doing my electronics and decided to see how much they all weighed. I was thinking about left right balance and found out that the shorty lipo and the holders weighed around 220g on the left and on the right my motor, servo, esc, and fan was about 340g. The servo weighs about 60g so if it is moved to the other side it would make it very close to being even. (Around 280g on both sides.) In order to put the servo on the other side the shorty battery would need to be almost to the very back. The way the Exotek chassis is setup you can only mount a shorty lipo in the center area. So I ended up needing to drill 2 new holes for the lipo holder in the front. I also drilled 1 hole for servo mount, but not even sure if this is necessary. The servo seems to hold in place well without the post in the back. (Last image circled in red.)

With everything mounted the car is about 1210g (no body). I plan on putting weights down the center of the car under the shaft to "make weight."

I haven't had any track time using this mod so this is based on theory... It does however make it much easier to mount the electronics!

More Info:
-----------
I just broke out the 4 scales to see how this would play out. I know this is perfect but it should give an idea... I used yellow springs all around and the shock collars all the way up.

What the scales showed is this:
Rear Left - 320g
Rear Right - 330g
Front Left - 280g
Front Right - 280g

So that makes the left 600g and the right 610g
Rear is 650g and back 560g or 54/46%

Now if only I can get this bad boy to the track and get some real testing in.
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Tamiya TB Evolution V-20130719_144629_resized.jpg   Tamiya TB Evolution V-20130719_144707_resized.jpg   Tamiya TB Evolution V-20130719_144643_resized.jpg   Tamiya TB Evolution V-20130719_144726_resized.jpg  

Last edited by Travis S; 07-19-2013 at 11:05 PM. Reason: Added More Info
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Old 07-20-2013, 05:00 AM   #1916
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Looks like you are doing some VTA which is what I'm planning to use this car for. I was thinking about the shorty packs but was not brave enough to make the holes required. I remember wiring the TB03 was a fun challenge to get everything fit on one side.

I noticed you are not using the gear covers, is there a reason?
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Old 07-20-2013, 06:37 AM   #1917
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Quote:
Originally Posted by TenzoR View Post
Looks like you are doing some VTA which is what I'm planning to use this car for. I was thinking about the shorty packs but was not brave enough to make the holes required. I remember wiring the TB03 was a fun challenge to get everything fit on one side.

I noticed you are not using the gear covers, is there a reason?
You can still run a shorty pack in the center without drilling. You only need to drill if you want mount the servo on the other side. (See picture below I had both cars setup this way prior.)

If you use the Spec-R gear diffs the gear covers do not fit.

I have 2 cars. 1 that I will be running in USVTA and the other in USGT. They should be great for both classes. I just live far away from a track so haven't been able to test them yet.
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Old 07-22-2013, 05:48 PM   #1918
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Are you using 48P 60T spur gear? I can't find small 64P spur gear to use.
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Old 07-23-2013, 08:37 AM   #1919
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Are you using 48P 60T spur gear? I can't find small 64P spur gear to use.
One has an 80t and the other a 84t 64p spur. I did just order a 78t for my vta car.

http://www.amainhobbies.com/product_...-Spur-Gear-78T
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Old 08-03-2013, 10:50 PM   #1920
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....................

Last edited by JoeyE; 09-05-2013 at 10:32 PM.
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