Tekin 2050 overheating on 4S
#46
Thanks for the reassurance, Kevin. I've been hesitant with going up in gearing only because I've never done it before. Never gone beyond 19T in any 1/8th-scale that I've ever run. Like I said, I have a 20T and a 21T on order, they should arrive by Monday. I'll report back then.
#47
What I look for on a 1900 is around 9.5 to 10.0 depending on track ,etc.
2050 around 9.8 to 10.7 or so,etc. 1700s around 8.7 to 9.3...
FDR is calculated Spur/pinion x diff ratio
Of course these are starting figures and for 4s.
I've always looked at it this way, the cars we're using were designed around a nitro .21 engine that spins between 30k and 40k. Make sure your electric motor is around that rpm range and you should be good. This is for CHOOSING a motor/battery combo, NOT gearing.
So 4.2(per cell) x # of cells x KV of the motor
2050 around 9.8 to 10.7 or so,etc. 1700s around 8.7 to 9.3...
FDR is calculated Spur/pinion x diff ratio
Of course these are starting figures and for 4s.
I've always looked at it this way, the cars we're using were designed around a nitro .21 engine that spins between 30k and 40k. Make sure your electric motor is around that rpm range and you should be good. This is for CHOOSING a motor/battery combo, NOT gearing.
So 4.2(per cell) x # of cells x KV of the motor
#48
Tech Regular
What batteries are you using that hold 4.2 volt per cell under load?
#49
What I look for on a 1900 is around 9.5 to 10.0 depending on track ,etc.
2050 around 9.8 to 10.7 or so,etc. 1700s around 8.7 to 9.3...
FDR is calculated Spur/pinion x diff ratio
Of course these are starting figures and for 4s.
I've always looked at it this way, the cars we're using were designed around a nitro .21 engine that spins between 30k and 40k. Make sure your electric motor is around that rpm range and you should be good. This is for CHOOSING a motor/battery combo, NOT gearing.
So 4.2(per cell) x # of cells x KV of the motor
2050 around 9.8 to 10.7 or so,etc. 1700s around 8.7 to 9.3...
FDR is calculated Spur/pinion x diff ratio
Of course these are starting figures and for 4s.
I've always looked at it this way, the cars we're using were designed around a nitro .21 engine that spins between 30k and 40k. Make sure your electric motor is around that rpm range and you should be good. This is for CHOOSING a motor/battery combo, NOT gearing.
So 4.2(per cell) x # of cells x KV of the motor
EDIT- Just did some math according to your formula, and answered my own question.
Last edited by tq_danpatterson; 10-06-2010 at 10:39 PM.
#50
I just went through the same mess with my castle 2200 trying to figure out my gearing. I ended up having to go bigger on the pinion too to keep temps down.
I am also excited to try out my new 1512 1800kv.
I ended up getting an eagletree data logger. It's the only way to find the real optimal gearing for your track.
I am also excited to try out my new 1512 1800kv.
I ended up getting an eagletree data logger. It's the only way to find the real optimal gearing for your track.
#51
I don't choose to use a "loaded voltage" in my equation. Not using loaded makes my equation "on the safe side" .
#52
Deleted
Last edited by itbvolks; 10-07-2010 at 10:42 AM.
#54
To anyone who was thinking of asking an off-topic question in this thread, please either make a thread of your own, or PM the appropriate person for an answer.
Once my pinions arrive, I will update this thread with new temperature readings and performance reports.
#55
I deleted my post.
You've reduced the motor rpm by 3700rpm at the same voltage (14.8v). You need to go up ~2'ish teeth minimum.
You've reduced the motor rpm by 3700rpm at the same voltage (14.8v). You need to go up ~2'ish teeth minimum.
#56
#58
#60
Hmm. Might wanna be a bit careful there. Tekin CS told me that 180 is the maximum temp for the T8 motors, and 160 means you're either over-geared or over-timed. But hey, adding a fan will bring it down. And maybe still an even larger pinion.