05 Mod Pinion Gears for Super Astute TTC Gear Set and DF-03

[EEK2112 10]

Hey Everyone!

I am working on a vintage Astute and Super Astute and I'm running into a pinion issue. Seems like the 05 Mod Pinions are super hard to find these days. I have TTC Gear Sets for both and I only have one 20T pinion. I would love to get 2 23T pinions for both...but yeah, no luck at all finding them. Looks like Tamiya sold a set for the DF-03 (53922) with a 23T and 25T pinion but I can't find them.

Does anyone know where I can find 05 Mod Pinions that will work with the TTC? I would rather not modify anything at this point.

 

Any help would be appreciated

[ThunderDragonCy 8127]

On 3/27/2024 at 1:42 PM, EEK2112 said:

Hey Everyone!

I am working on a vintage Astute and Super Astute and I'm running into a pinion issue. Seems like the 05 Mod Pinions are super hard to find these days. I have TTC Gear Sets for both and I only have one 20T pinion. I would love to get 2 23T pinions for both...but yeah, no luck at all finding them. Looks like Tamiya sold a set for the DF-03 (53922) with a 23T and 25T pinion but I can't find them.

Does anyone know where I can find 05 Mod Pinions that will work with the TTC? I would rather not modify anything at this point.

 

Any help would be appreciated

Seems that will a bit of opening out of the centre holes you can fit Tamiya or Associated 48dp spur gears so you can get any size you like of 48dp pinions.

 

[EEK2112 10]

The original TTC Gear Set from 1991 has a different slipper clutch than the one from 2018. Looks like I might be able to do it if I have all of the modern TTC parts (plates/pads/spring...and so on). But those parts don't seem to be available anymore. The hunt is on! It's getting harder to find the vintage parts to run these cars...I like to run my vintage cars too.

[ruebiracer 1173]

You´re right, even Seidel in Germany is out of stock, and he usually has a big inventory. All that´s left is a 26T pinion:

Tamiya - 3505054 Motorritzel 26Z M0.5 DF-03 Dark Impact - Modellbau-Seidel

[EEK2112 10]

I saw the 26T, I can get that, but the motor plate only allows up to a 23T pinion. Also the gear cover might not fit over a 26T even if I file down the motor plate to make the 26T fit. I saw that FTX makes a 22T .5 mod but the bore is 2mm so I would have to drill out the center or find a machine shop to do it more precisely. I'm going to keep searching.

[Nikko85 3774]

Would this work?

https://www.applianceelectronics.co.uk/viewproduct/38355/pinion-gear-22t-05-mod-cnc-23mm-bore

Looks 22T 0.5 mod and 2.3

[EEK2112 10]

I saw the Arrma .5 pinions, unfortunately the bore is not correct. They use those for their smaller 1.18th scale RCs. The 540 motors have a bore of 3.17mm.

I just ordered the 26T df03 pinion, next problem is will the motor overheat with such a big pinion (max should be 23T). As long as I use a motor with a lot of torque and adjustable timing, I think that should work. I do plan on running it, and I think the Dynatech 02H has plenty of torque. Might try to find one if it is cheap enough.

[Thommo 1242]

 

Interested to see if their is enough adjustment for the 26t to fit without elongating the motor adjustment.  The OG TTC gearbox has a large spur gear so it's geared quite low.  If you're going brushed motor the best way to keep motor temp down would be reduce weight.  The best way to reduce weight is run with shorty LiPo.

I've just converted 2 x Astutes to run shorty LiPo using Top Force parts and only using the existing holes in the chassis plate.  I'll update one of my Astute threads with more info at some point.  Let me know if this is of interest.

 

[ruebiracer 1173]

18 hours ago, Thommo said:

 

Interested to see if their is enough adjustment for the 26t to fit without elongating the motor adjustment.  The OG TTC gearbox has a large spur gear so it's geared quite low.  If you're going brushed motor the best way to keep motor temp down would be reduce weight.  The best way to reduce weight is run with shorty LiPo.

I've just converted 2 x Astutes to run shorty LiPo using Top Force parts and only using the existing holes in the chassis plate.  I'll update one of my Astute threads with more info at some point.  Let me know if this is of interest.

 

Really interested @Thommo, have an old SA to restore as well as an std. Astute. Super Astute shall be a possible runner.

[EEK2112 10]

I was thinking a Super Stock BZ motor should work also, has a lot of torque and will handle 2S Lipo without an issue. The TTC gearbox might have a large spur, but it is quite smooth, not a lot of resistance. I don't think heat will be an issue...fingers crossed. But I do like the idea of the shorty Lipo, anything to save weight is welcome. Would love to see where you positioned it.

[Thommo 1242]

32 minutes ago, Thommo said:

 

For  @ruebiracer  and anyone interested in converting Astute / Super Astute to accept shorty LiPo.  This conversion can be done with no drilling, using the existing holes in all Astute chassis' including the Xtra Speed carbon chassis.  The start point is to use a regular size servo, (Futaba 3003 shown) and remove the rear bulkhead and the SA rear battery holder G5.  Remove the front battery holder G2.  Use sponge sheet on the chassis as required.

Parts list :

Avante / Egress / Astute chassis stay x 2

Top Force J parts - J5 x 2.  (These are Not Used parts for a Top Force build).

Top Force screw hex mounts or use Xtra Speed aluminium body mounts x 2.

Top Force battery plate or Xtra Speed carbon battery plate for Top Force (shown) x 1.

Any servo stay x 1.

Hardware so screws, tapping screws, sponge sheet and snap pins.

With the battery holders removed and sponge sheet in place, replace the rear battery holder with 2 x chassis stays.  The OG Astute already has these as standard (shown).  Fit the 2 x screw hex mounts or body mounts to the 2 x J5 parts and fit those to the chassis to replace the front battery holder.  The existing holes in the chassis match the Top Force battery plate so it's a perfect fit.  Then mount the 1 x servo stay as shown.  This is the existing hole for the OG mechanical speed control mount and just happens to be in the perfect location to act as the rear battery stop.  Then just add sponge sheet to the servo at the front and this acts as the front battery stop.  I used another sponge sheet on the rear battery stop to get it snug.  That's what I love about batteries, our Astutes get older... they stay the same age ! 

 

 

 

 

BOOM !

[GTodd 1562]

The fact Tamiya brought out the rere astute with a metric spur gear while the 201 and 5xxs had standard pitch 48 pinions is goofy .  Either get a Tamiya standard spur gear for the 201 or an AE spur gear and you are all set. 

[Thommo 1242]

Respectfully, OP is building an OG TTC not a 2018 so not as simple.  05 mod pinions are out there, just not easy to find.

[EEK2112 10]

Update for anyone who is interested...

I bought the 26t 05 mod pinion that was available...and it fits! It is the largest you can use with the original TTC. The Mesh is perfect, and it is steel, not the soft aluminum so it should last. I did purchase a Super Stock BZ motor and upgraded the bushings to bearings. It has a lot of torque, so hopefully it will be a good combination for my runner Astute.

[Fruitfly01 596]

On 4/16/2024 at 2:11 PM, EEK2112 said:

Update for anyone who is interested...

I bought the 26t 05 mod pinion that was available...and it fits! It is the largest you can use with the original TTC. The Mesh is perfect, and it is steel, not the soft aluminum so it should last. I did purchase a Super Stock BZ motor and upgraded the bushings to bearings. It has a lot of torque, so hopefully it will be a good combination for my runner Astute.

I run a 25 tooth pinion on an original TTC mounted to a Madcap. The motor is a Stock BZ, with bearings.  The speed is good although the power delivery is bit hairy, but a little adjustment of the TTC tames things a bit, as well as using the right tires for grip under acceleration.  I run on short grass and dusty tarmac, mostly.  The motor never gets too hot and run times are good with a 2s lipo.  The downside being the breakages which are more frequent with older plastics and more power.  The main areas being the rear arm carriers and the front skid plate.  

 

[EEK2112 10]

Sounds good, that is exactly how I will be running my Astute. I don't think heat will be an issue, the gear ratio is good with the TTC even with the 26t pinion. Thanks for commenting, it gives me a little more confidence to run it with this setup. I'll be using a HW 1060 or 1080 ESC and a 2s lipo.

[Thommo 1242]

Photos 🙏