Tt02b Spur pinion and suspension

[Reliver]

Hi all.  Finally built the neo scorcher and son loves it.  Had a couple of issues.

1.  I have put monster wheels (12cm) on it as everywhere we run it needs more clearance.  I understand this puts more strain on the motor.  Would using 16t pinion be enough or would I need a new spur gear/pinion combo?

2.  Also the base of the shock which holds the spring has broken already.  Is this normal? Where is the best place to get replacement parts in uk?

Thanks all

[Jonathon Gillham]

9 hours ago, Reliver said:

Hi all.  Finally built the neo scorcher and son loves it.  Had a couple of issues.

1.  I have put monster wheels (12cm) on it as everywhere we run it needs more clearance.  I understand this puts more strain on the motor.  Would using 16t pinion be enough or would I need a new spur gear/pinion combo?

2.  Also the base of the shock which holds the spring has broken already.  Is this normal? Where is the best place to get replacement parts in uk?

Thanks all

I haven't monsterised a TT02B but I suspect dropping 1 tooth on the pinion won't be enough for wheels that big , you'll probably need more. On the TT02 cars you'll need the High Speed Gearset. This gives you an adapter plate which allows you to swap to any spur. Get the Yeah Racing motor mount while you're at it and you can then choose unlimited gearing options, rather than the 5 that the kit allows. I would look at swapping to 48p gears while you're at it (unless you have a heap of mod .6 gears lying around) as 48p are a lot more common and easier to find.

Check TonysTamiyaParts on ebay for parts. He is UK based but I find him one of the best sources for Tamiya parts and I'm in New Zealand. Otherwise your usual suspects - Fusion, Modelsport, Timetunnel etc (yep order from them too)

[Problemchild]

What bit has broken?

JJ

[Reliver]

Hi JJ.  I am sure I should be paying you for this advice.

What would be the simplest way for me to get started on this?  Would I be able to get the high speed set and a different pinion ?  Or would I need the yeah racing mount  and the 48p?

Are there any tables you would recommend to give the grating ratios and relate it to the wheel size? 

Apologies for the basic questions but I am quite new to this. I have read some previous threads but my knowledge is still basic.

Ref suspension...it was the part x5 but i have bought a replacement. 

Ever thankful

Alun

[Jonathon Gillham]

I think the internal ratio (IR) of the TT02B is 2.6

To calculate the FDR is formula is spur / pinion X IR

So the kit setup is 70/17 x 2.6 = 10.7

You can use that to work out what spurs and pinions to buy.

The High Speed Gearset comes with a 68T spur, and the kit one is 70T, so the gear with the high speed set isn't helpful,its the adapter you want which allows you to fit normal spurs.

The kit wheels are about 8cm vs the 12cm for yours. Circumference changes from 25cm to 38ish, 50% bigger. I assume that this effectively drops your FDR to about 7.1 (bigger wheels should have the same effect as bigger pinion) but @ThunderDragonCy will be able to confirm that is correct or if I'm way off the mark.

Options from here

Buy the high speed gearset and spurs and pinions to get the FDR back up to around 10 for use with the kit motor.

Buy a 13.5T or 17.5T brushless motor (assuming you have the TBLE-02S ESC) which will happily run that FDR. This will also make the car a lot faster. This isn't as crazy as it sounds, a cheap motor is 20quid which will be about the same price as the gears etc

[ThunderDragonCy]

Whilst @Jonathon Gillham is right about the bigger wheels effectively making a much taller gear, the TT02B is very low geared out of the box for a buggy. If we just stick with the actual FDR of 10.7 for a minute, I can give you a comparison with my truck. I have a DT03 with truck wheels which are 105mm diameter and the limited gearing means my choice is 9.22 FDR but i have never had a problem with that, but i have always run something around 10.5-13.5 brushless motors.

Probably wouldn't hurt going for the 16t 0.6mod pinion, especially if you get a steel one, because there is going to be a lot of torque going through the drivetrain. I don't think it's worth getting the high speed gearset because i am not sure it will allow you to fit a bigger spur gear (which is what you need to reduce the gear ratio) because i don't think it will fit in the gearcase. What is working looking for IMHO is an aluminium adjustable motor mount. One, because it will be stronger than the plastic one and absorb the heat of the hard working motor better (see torque in the drivetrain again), but also the adjustable ones might allow you to go even smaller on the pinion if the gearing proves to be a bit too tall for the motor. Modelsport have tge Fastrax one for a tenner

https://www.modelsport.co.uk/index.php?product_id=431588&gclid=CjwKCAjw4pT1BRBUEiwAm5QuRxa9LiUw1wffzvp6S4_j2nn4KuHHmpK5QSzRj-hnFohlYqYiybW6jRoC52cQAvD_BwE

 

[Reliver]

Thanks Guys.  I am new to this and really want to get the right set up so my kids can enjoy the car.  I appreciate the time you guys take to help me.  I have read previous posts you guys have made on this.

So a few questions and thoughts.

1.  I must admit I was missing the IR to understand the gearing numbers.  Can you explain how this is calculated for the tto2b stock?  I presume the wheel diameters come into this.

2. a)  It sounds like the easiest path is getting the 16t 0.6mod pinion and aluminium adjustable motor mount?

b) I see the one you put in the link, is that the same concept as the Yeah racing mount? Looking at the Yeah mount, not sure how that fits in the stock casing?

3. How do you know where exactly to fix the motor into?  I see that the stock tt02b has diagrams for the screw positions for mounting the motor, without these, or an adjustable mount, how would you know? For example if we could use a smaller pinion, what could work and how would I know the position? Is it just move it until it meshes?

4.  When would I need to look at a brushless motor?  How does this help ref gearing ratio?

5.  Then the final step would be looking at the high speed gear set and 48p if it fits,  JJ -  have you tried this on the tt02b, and does it fit the stock casing?

Thanks!

 

 

[Reliver]

Additional - If I had the variable aluminium motor mount, what are the lower pinion options?  I can see for example I could get a 15t pinion, would it need to be .6mod to work with the stock spur? {edited - I can see you would need .6mod, but still a question on what lower pinion could work}

eg https://www.modelsport.co.uk/rw-6-pinion-15-teeth/rc-car-products/13754

Does the 48p need a different pinion set? {edited - checked and I understand you do}

[Reliver]

Ps orded this from motorsport:

1 x RW .6 Pinion 15 teeth  » 
1 x Schumacher 16t Steel Pinion Gear - 0.6mod  » 
1 x Fastrax Tamiya TT-02 Aluminium Adjustable Motor Mount  » 

 

[Problemchild]

I came from a slightly different start point as I got a 2nd hand TT02b MS (lots of hop ups already.

but then I got the motor mount and high speed gear set (don’t forget it’s like push bikes and gears) 

metal diff gears (modified)

yeah racing steering set up (essential I think)

£30 goolrc brushless combo and it was awesome - added a £20 3s LiPo And it’s bonkers 

I’d not get the yeah racing metal lower arms though - the plastic ones are supposed to be more forgiving 

JJ

[Problemchild]

steering

https://www.ebay.co.uk/itm/381878931088
 

motor mount 

https://www.ebay.co.uk/itm/381878931113
 

drive shaft

https://www.ebay.co.uk/itm/381878931013

enjoy

 

 

JJ

[Jonathon Gillham]

18 hours ago, Reliver said:

Thanks Guys.  I am new to this and really want to get the right set up so my kids can enjoy the car.  I appreciate the time you guys take to help me.  I have read previous posts you guys have made on this.

So a few questions and thoughts.

1.  I must admit I was missing the IR to understand the gearing numbers.  Can you explain how this is calculated for the tto2b stock?  I presume the wheel diameters come into this.

2. a)  It sounds like the easiest path is getting the 16t 0.6mod pinion and aluminium adjustable motor mount?

b) I see the one you put in the link, is that the same concept as the Yeah racing mount? Looking at the Yeah mount, not sure how that fits in the stock casing?

3. How do you know where exactly to fix the motor into?  I see that the stock tt02b has diagrams for the screw positions for mounting the motor, without these, or an adjustable mount, how would you know? For example if we could use a smaller pinion, what could work and how would I know the position? Is it just move it until it meshes?

4.  When would I need to look at a brushless motor?  How does this help ref gearing ratio?

5.  Then the final step would be looking at the high speed gear set and 48p if it fits,  JJ -  have you tried this on the tt02b, and does it fit the stock casing?

Thanks!

 

 

The IR is determined by the diff ring and pinion gears and it fixed. It is usually given in the manual but isn't in the TT02B, but easy enough to work out with the formula as you know the other variables.

You need to set the gear mesh yourself with the adjustable mount. I do it by eye, but if you get a piece of paper, put it between the 2 gears and squash them together then roll the paper out. The paper will create a gap which is about right.

Brushless motors have more torque and can run higher gear ratios. You never need to change to brushless, but if you want more speed brushless is the way to go. They are more efficient and more powerful.

And just cos I mentioned the high speed gearset doesn't mean i've tried it! I have 3 TT02 cars but they are pretty much stock. My race cars have the ability to swap spurs though so know how they work. As for fitment, couldn't tell you what size spur will fit though sorry. I assume you could go up to 80T or so, which also means you can run a smaller pinion since the spur is physically ****** so will reach a small pinion. If they rub you can cut the top off the spur cover. You need the cover since it holds the bearing in but you don't need all of it...

[Reliver]

Wow, thanks all.  Really great advice.

I think I was looking at the wrong Yeah racing mount originally.

Also thanks for replying to my other questions, nice tip with the paper.

Cant wait for the parts.  I have found that in the current stock format and big wheels, both times I have gone out, the motor has worked loose as we are driving over rough ground and prob due to a high torque and bad build quality :-O....learning.

Just better not tell my wife I keep buying 'extras'!