Still struggling with gearing

[Lee24h]

Im still struggling with the correct gearing on 210 it has a 81t spur and im running a 23 pinion on a 7.5t motor and yet my speedo and motor are still getting hot any help

[mattr]

How tight is the gearbox? I find my electrics get hotter (not dangerously hot, just another 5-10 degrees) If I clamp the three main screws down too tight. Just half a turn allows it to spin much more smoothly.

And how hot are they 70? 80? 90? Thermal shut off?
I get up to 65-75 ish. That gives me another 20 degrees before the cut off.

[Lee24h]

How tight is the gearbox? I find my electrics get hotter (not dangerously hot, just another 5-10 degrees) If I clamp the three main screws down too tight. Just half a turn allows it to spin much more smoothly.

And how hot are they 70? 80? 90? Thermal shut off?
I get up to 65-75 ish. That gives me another 20 degrees before the cut off.

Speedo about 70 motor about 60

[OneKiwi]

How long are you running?
Do you have any timing?
What electrics are you running?

[Lee24h]

No timing
Tekin rs pro
vampire 7.5t
5 mins on high grip astro

[OneKiwi]

http://teamnovak.com/tech_info/view_article/26
http://www.petitrc.com/setup/durango/setupdex210/DEX210_GearChart/

Your in the ball park there maybe drop a tooth

What are your settings on the esc?
Ask in the tekin thread as well, or have a look on their site for setups.

http://www.petitrc.com/reglages/tekin/SetupSheetsTekinRS.html

Although there aren't many astro setups there

Holes for airflow?
Is it running smooth without the pinion on?
Check the gearbox so its running smooth. I can recommend shims by the motor plate and don't hulk it with the screws

[mattr]

Speedo about 70 motor about 60I wouldn't worry then. According to "the Internet" the thermal cut off on that speedo is over 100 deg C. Even allowing for tolerances, bad measurements, cooling down and so on, you are no way near that!

[Lee24h]

So what fdr are people running on their dex 210 on VERY high grip astro

[OneKiwi]

Did you look at the charts?

http://www.petitrc.com/setup/durango/setupdex210/DEX210_GearChart/DEX210_GearChart.jpg

Approx so try and test temps
6.5T-10
7.5T-9.5
8.5T-9

If you are still getting heat issues then you are going to have to recheck the gearbox and pinion mesh.
Did you ask in the tekin thread for setups?
PM Randy Pike on here or on RCTech

[mattr]

FWIW I'm running 22/83 (9,81 fdr) with a 6,5t and topping out at 75 ish (as I said before)

How cool do you want the motor to be?

[Dombrasky]

If it helps at all i run 23\83 (9.38 FDR)on a 7.5 x20 with a Tekin RS, it gets hot... not sure in degrees but too hot to run an 81 spur imo
Ran indoors on high grip carpet in a 6min final, and outside on high grip Astro (6min finals) and its been fine

[kartstuffer]

Running 24/81 and turn the motor timing back to about 4 deg , that's in a 210 on indoor astro .

[TonyM]

Are you running the RS Pro in dual or sensored mode?

I find sensored tends to run quite a bit hotter than dual. If you are in this mode then check the timing on your motor endbell (factory settings on Tekin are usually 10-12 degrees. I don't have any experience with Vampire motors) then set your Boost setting using the hotwire facility to give an overall setting of around 30 degrees (e.g. 12 on the motor + 18 Boost = 30 degrees) this should run quite cool. Test this out then increase Boost until you reach a comfortable heat after 5 min runs (I aim for three lights flashing on my ESC and 68C/155F on my motor)

[Chalkie]

Lee you won't stop your car getting hot at Silverstone, the tracks are too aggressive for that. Your gearing seems about right so as long as you car doesn't thermal don't worry, if it does thermal you need to go down the route of cutting vents in the shell, and adding heatsinks/fans.

[OneKiwi]

You could shoe goo a fan behind the esc so it blows on the solder points or I think viper does a fan holder for their fan less esc

[ridgeracer]

I run 8.6/1 (25/87) in a DMX410 wich should have more friction than a DEX210, and my themps are, esc: 44 motor: 58 after 10 min with a 7.5 Trackstar silvercan.