GT-Tuned motor

[skom25]

Hi,

GT-Tuned motor appeared in my LHS, which is quite surprising (I was pretty sure that they are discontinued).

I have few questions:

1. Is it as hot as SS motor?

2. It is not rebuildable. Will it loose performance quite quickly as SS motors? What is your experience?

[Thommo]

GT Tuned has taken some hits recently as it’s not as hot as a Sport Tuned on the same pinion.

I stand by it’s the best motor for re-releases on the standard pinion and better than Sport Tuned on bigger pinions if possible because it pulls harder down low and stays way cooler (temp) on stock and bigger pinions.

It doesn’t lose performance quicker than SS because it runs cooler and has lower rpm.

[Twinfan]

The instructions with it suggest a gear ratio of 6.5 - 7.5, but I think this is for on-road cars?  For a buggy it should be a little higher I guess due to the larger wheels.

It seems to be a step above the Lightly Tuned/Dirt Tuned motors but in the same vein.  So a silver can with more torque and a few more revs, but nowhere near as many as a Super Stock.

[alvinlwh]

In paper, specs suggest it is a bit better than a Sport Tuned. Actual performance is just a bit better than a silver can. 

[MadAtComputer]

6 hours ago, Thommo said:

GT Tuned has taken some hits recently as it’s not as hot as a Sport Tuned on the same pinion.

I stand by it’s the best motor for re-releases on the standard pinion and better than Sport Tuned on bigger pinions if possible because it pulls harder down low and stays way cooler (temp) on stock and bigger pinions.

It doesn’t lose performance quicker than SS because it runs cooler and has lower rpm.

Would  a GT tuned be a good fit for a super sabre re re with a 15t pinion? the stock motor gets hot in grass, which is were I have to drive. 

[skom25]

9 minutes ago, alvinlwh said:

In paper, specs suggest it is a bit better than a Sport Tuned. Actual performance is just a bit better than a silver can. 

I wonder why. I see that it has RPMs around Sport Tuned and a lot of Torque (I do not remember exactly, but it is close to Super Stock).

[Twinfan]

34 minutes ago, skom25 said:

I wonder why. I see that it has RPMs around Sport Tuned and a lot of Torque (I do not remember exactly, but it is close to Super Stock).

GT-Tuned: Specifications ★Input voltage: 7.2-8.4V ★RPM (without load): 19,000 ★Maximum torque: 500g/cm (@ 7.2V)

Sport Tuned: Specifications ★Input voltage: 6-8.4V ★Maximum torque: 350g-cm (at 7.2V) ★Maximum RPM: 18,300 (at 7.2V) ★23T

The specifications aren't clear if they're comparing like for like.  The GT-Tuned RPM may be at 8.4v for example.......

So the GT-Tuned has more torque than a Sport Tuned, but I suspect the Sport Tuned revs higher like for like.  This matches what I've found, in that the Sport Tuned needs lower gearing to manage heat.

[Thommo]

35 minutes ago, MadAtComputer said:

Would  a GT tuned be a good fit for a super sabre re re with a 15t pinion? the stock motor gets hot in grass, which is were I have to drive. 

Yes or Dirt Tuned..:.:  

[Pylon80]

1 hour ago, skom25 said:

I wonder why. I see that it has RPMs around Sport Tuned and a lot of Torque (I do not remember exactly, but it is close to Super Stock).

RPM is only an indication of the KV. Since the stock motors have stronger magnets and better brushes than the silver cans it stands to reason that the GT Tuned would be more powerful than a Sport Tuned, having very similar KV's.

But back to your original question, no matter how you cut and dice it, the Super Stock is 23 turns and the GT Tuned is 25 turns and they are of very similar design and construction otherwise. So you have your answer as to which one will make the most power  There could be minute differences in the brushes (although even that sounds doubtful) and the springs are probably bent at a slightly different angle, but otherwise they are very similar, meaning the turn count will tell the story.

For you second question, I think there is hope. In my experience, the higher the turn count, the longer the comm lasts. It seems safe to say the the GT tuned will last a little longer than the SS.

[MadAtComputer]

1 hour ago, Thommo said:

Yes or Dirt Tuned..:.:  

Thank you. I did some checking of specs and I think a GT Tuned will be what I want. 

[Juggular]

They are so closely matched, I'd just get whatever is cheaper.  (right now Sport Tuned is $14, GT tuned is $28. Edit: this is current Amazon price.)

If GT was like $20, and if it was rebuildable, I might spend the extra money. (so I could put bearings in to gain 10% speed.)  But it's not rebuildable. And the GT is nearly as expensive as the Super stock ($31).  It does have more torque, so you could use one more tooth on the pinion.  But is it worth 2 Sport Tuned motors?  Everybody makes that decision on their own. 

For me, I'd rather pay $3 more to get a Super Stock which has the same torque as the GT , but 8000 RPM faster. (Plus you have the option of putting bearings in to get even more torque and speed). 

 

[skom25]

26 minutes ago, Juggular said:

They are so closely matched, I'd just get whatever is cheaper.  (right now Sport Tuned is $14, GT tuned is $28)

If GT was like $20, and if it was rebuildable, I might spend the extra money. (so I could put bearings in to gain 10% speed.)  But it's not rebuildable. And the GT is nearly as expensive as the Super stock ($31).  It does have a bit more torque, so you could use one more tooth on the pinion.  But is it worth 2 Sport Tuned motors?  Everybody makes that decision on their own. 

For me, I'd rather pay $3 more to get a Super Stock which has the same torque as GT tuned, but 8000 RPM faster. (Plus you have the option of putting bearings in to get even more torque and speed). 

 

In my area Super Stock is much more expensive.

Torque Tuned 45 PLN

Sport Tuned 75 PLN

GT Tuned 129 PLN

Super Stock 220 PLN

1 Euro = 4.25 PLN

I have to say, that I expected different answers. In that case, I do not see too much reasons to buy GT Tuned for price of 3 Torque Tuned motors.

 

[alvinlwh]

51 minutes ago, Juggular said:

 

 

Those videos often have those who do not like the results screaming unscientific/unfair/incorrect gearing/etc... I remembered a while back, I posted his video showing that rubber shielded bearings are better than metal shielded bearings and there are criticism ranging from not repeatable to excessive greasing in the metal bearings, from people that had not even watched the whole video to see how the test was carried out. 

Anyway, the standing start test seems to prove that it's torque is no better (or worse) than a ST. As for the top speed...the result speaks for itself. 

51 minutes ago, Juggular said:

If GT was like $20, and if it was rebuildable (so I could put bearings in to gain 10% speed), I might spend the extra money.  But it's not rebuildable. And the GT is nearly as expensive as the Super stock ($31).

Agree with this very much. If one can aquire the GT (not the UGT as they seems excessively expensive) at Asia prices without too much shipping or tax, then it is a nice addition for bling over a TT or silver can. However at European (or USA) prices, it is just not worth the extra over a TT which it seems to match in actual performance. 

[Juggular]

34 minutes ago, skom25 said:

In my area Super Stock is much more expensive.

Torque Tuned 45 PLN

Sport Tuned 75 PLN

GT Tuned 129 PLN

Super Stock 220 PLN

1 Euro = 4.25 PLN

I have to say, that I expected different answers. In that case, I do not see too much reasons to buy GT Tuned for price of 3 Torque Tuned motors.

 

Wow, those prices are different. 

The Torque tuned falls right in between the silver Can and the Sport Tuned in terms of RPM.  14000 for the silver can, 16000 for the Torque, 18000 for the Sport, 27000 for Super Stock. 

The Torque tuned does not have more torque than the Sport, though.  Their torque is about the same. I was wrong. Sport Tuned has more torque. See @MadAtComputer's comment below. (but I don't know where the max torque happens at the RPM band: one could have more torque at higher or lower RPM.)   2000 rpm is only 1/7th increase, so the improvement would not be drastic.  

GT tuned is expensive there too.  

 

[MadAtComputer]

At Amain here in the US a super stock is $43.20, GT tuned $35.20, sport tuned $24, torque tuned $17.50.  Torque numbers,  Sport tuned 350g/cm, torque tuned 305g/cm, GT tuned and super stock both 500g/cm. 

 

[Juggular]

22 minutes ago, alvinlwh said:

Those videos often have people screaming unscientific/unfair/incorrect gearing/etc... I remembered a while back, I posted his video showing that rubber shielded bearings are better than metal shielded bearings and there are criticism ranging from not repeatable to excessive greasing in the metal bearings

Yes, those Tamiya metal shielded bearings are jam packed with thick grease to keep the dirt out.  So, it was natural that metal shields were slower than after market rubber shields.  

If you had washed out both, and lubricated both with light oil, metal shields might be slightly faster (but it won't be good against dirt--which is why I only used the washed metal shields in the sealed gearbox only.)

3 minutes ago, MadAtComputer said:

At Amain here in the US a super stock is $43.20, GT tuned $35.20, sport tuned $24, torque tuned $17.50.  Torque numbers,  Sport tuned 350g/cm, torque tuned 305g/cm, GT tuned and super stock both 500g/cm. 

 

You are right!  Torque tuned has less torque than the Sport. I'll edit. Thank you!

 

[Pylon80]

20 minutes ago, MadAtComputer said:

Amain here in the US a super stock is $43.20

You can buy a Super Stock for 30$ or less, free shipping, on Amazon.com. Currently 31$ for the TZ and I bought my last one for 28$.

[MadAtComputer]

59 minutes ago, Pylon80 said:

You can buy a Super Stock for 30$ or less, free shipping, on Amazon.com. Currently 31$ for the TZ and I bought my last one for 28$.

 tamiya motors on amazon being from third party sellers with much lower prices than anywhere else makes me question if they are genuine tamiya motors. So I have not messed with it. returns are pretty easy though if it dose not seem legit. hmm

[Pylon80]

They are legit indeed, go for it.

[Juggular]

5 hours ago, Pylon80 said:

You can buy a Super Stock for 30$ or less, free shipping, on Amazon.com. Currently 31$ for the TZ and I bought my last one for 28$.

Yes, I've seen TZ at $28 many times over the years on Amazon.  Next time it falls below $30, I might get one myself.