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Old 10-21-2016, 06:21 AM   #2266
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Got my exo hubs and spools in. They look great. The hubs went in no prob, and one car the spool went in no prb. The other, I couldn't shim it to save my life. The gears were way too tight. Tried shimming both the spool and the input shaft. Nothing. Swapped with the spool that worked in the other car. Still bad. Finally on a whim decided to change lower bulkheads. Now it works fine. Still not perfect, but as close as I'm gping to get. The quality of the exo parts is well above average, the plastic diff housing however...

Those exo aluminum diff housings can't get here soon enough.
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Old 10-21-2016, 08:21 AM   #2267
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Got my exo hubs and spools in. They look great. The hubs went in no prob, and one car the spool went in no prb. The other, I couldn't shim it to save my life. The gears were way too tight. Tried shimming both the spool and the input shaft. Nothing. Swapped with the spool that worked in the other car. Still bad. Finally on a whim decided to change lower bulkheads. Now it works fine. Still not perfect, but as close as I'm gping to get. The quality of the exo parts is well above average, the plastic diff housing however...

Those exo aluminum diff housings can't get here soon enough.
Yeah I was kind of surprised that Tamiya stopped making the aluminum lower gear boxes. Wonder what that was all about.
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Old 10-21-2016, 11:19 AM   #2268
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Yeah I was kind of surprised that Tamiya stopped making the aluminum lower gear boxes. Wonder what that was all about.
If you look at one up close, they are a very complex and precisely machined part. My guess is that they were incredibly expensive to manufacture for a niche car and they probably had to switch their mills to production of other parts.

One could also contend that with Tamiya's Evo 6 MS aluminum chassis, the aluminum lower gear boxes could increase the rigidity of chassis at the bulkheads too much.

I run them on my car and they are more trouble then they are worth to be honest.

In my opinion the main benefit is that there is less of a chance the threads will strip.

In my experience they don't seem to increase drivetrain efficiency by any appreciable amount, since you are still effectively shimming the gears to the tolerances set by the tighter plastic upper halves.

I still run them because they were incredibly expensive.

Also, I'll list two NIP lower aluminum gearboxes for sale soon... This post will probably lower their selling prices.

Last edited by B. Santos; 10-21-2016 at 01:11 PM.
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Old 10-21-2016, 12:39 PM   #2269
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I have not run my Evo 6 in a bit but where can I get the alum gear boxes?
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Old 10-21-2016, 01:23 PM   #2270
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You can't. There are no Tamiya ones left, and Ecotek is working on some.
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Old 10-21-2016, 02:22 PM   #2271
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You can't. There are no Tamiya ones left, and Ecotek is working on some.
Ahh - ok, thanks prof
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Old 10-22-2016, 02:46 AM   #2272
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If you look at one up close, they are a very complex and precisely machined part. My guess is that they were incredibly expensive to manufacture for a niche car and they probably had to switch their mills to production of other parts.

One could also contend that with Tamiya's Evo 6 MS aluminum chassis, the aluminum lower gear boxes could increase the rigidity of chassis at the bulkheads too much.

I run them on my car and they are more trouble then they are worth to be honest.

In my opinion the main benefit is that there is less of a chance the threads will strip.

In my experience they don't seem to increase drivetrain efficiency by any appreciable amount, since you are still effectively shimming the gears to the tolerances set by the tighter plastic upper halves.

I still run them because they were incredibly expensive.

Also, I'll list two NIP lower aluminum gearboxes for sale soon... This post will probably lower their selling prices.
Troubles? I've them on 3 cars and properly shimmed (as you have to do in plastic versions too) it's one of the best hop ups you can do to the TB03/TB04/Evo6 series.

I can't understand why Tamiya had only a limited run on these bulkheads but i rather think Tamiya has a new drive shaft concept in the works and won't sit on tons of expensive machined bulkheads of a not so popular drive shaft concept.

Best regards.
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Old 10-22-2016, 07:17 AM   #2273
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Troubles? I've them on 3 cars and properly shimmed (as you have to do in plastic versions too) it's one of the best hop ups you can do to the TB03/TB04/Evo6 series.

I can't understand why Tamiya had only a limited run on these bulkheads but i rather think Tamiya has a new drive shaft concept in the works and won't sit on tons of expensive machined bulkheads of a not so popular drive shaft concept.

Best regards.
My intention was to say that it takes more effort to search out and buy the Tamiya aluminum lower cases now, than what they are worth in performance. The only option is to scour the secondary market, or wait for the Exotek lowers.

I don't believe they are one of the best hop-ups available because of their high price and the fact that the overall drivetrain efficiency is still affected by how well you shim for the upper half.

Are they one of the better option parts? Yes.

The aluminum lowers seem to have more concentric bearing seats, reducing the pressure on the bearings and eliminating any need to vertically shim or modify the plastic upper bearing seats.

But as you pointed out, they still require shimming like the plastic ones, so any gains are really dependent upon the patience of the builder.
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Old 10-23-2016, 10:10 AM   #2274
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Vertically shim? Who is vertically shimming the bearings? How would you even go about that?
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Old 10-23-2016, 12:20 PM   #2275
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Vertically shim? Who is vertically shimming the bearings? How would you even go about that?
Nothing about vertically shimming the bearings, but rather the placing a thin shim between the gearbox halves to free everything up.

Tamiya TB04 Pro
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Old 10-23-2016, 02:20 PM   #2276
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Quick question what's the difference between tamiya evo 6 black edition vs tamiya evo 6 ms?
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Old 10-23-2016, 05:07 PM   #2277
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The most important difference is the MS has the better center gearbox design. If both are available to you, definitely pick the MS.
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Old 10-23-2016, 06:56 PM   #2278
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I have been gone for almost a year but I have the black edition with the exo conversion can I upgrade to the new gear box? Whats the benefits?
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Old 10-23-2016, 07:21 PM   #2279
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I have been gone for almost a year but I have the black edition with the exo conversion can I upgrade to the new gear box? Whats the benefits?
If you're using the Exo conversion, the new centre gearbox is irrelevant as it's not used.
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Old 10-24-2016, 09:32 PM   #2280
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Back with good results from the weekends CenCal Challenge. USGT was by far the biggest class of the 3 day race and the EXO-SIX represented well!
Had to work from way back in the field (blew a motor in qualifying, cost me a better grid spot) but was able to pick off some very fast cars 1 by 1 and ended up 2nd place and less than 1 second behind first. Have only ran this USGT car at 2 events this year but really loving the drive train and Tamiya handling!

Notes;
Prototype flexy top plate for extra grip on the bumpy asphalt track.
Exotek spool used.
Prototype carbon drive shaft.
Off the shelf (Hobbytown) R1 v11
Exotek C-hubs



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Last edited by MikeR; 10-24-2016 at 09:48 PM.
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