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Old 11-01-2009, 04:19 AM   #196
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Default Estimated kV rating at -10 degrees timing

Hi. I am using an X12 5 turn currently. I would like to know what is the rough kV of the motor at the factory recommended timing setting of -10 degrees given that at 0 degrees its rated for 7100rpm/V.

Thanks.
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Old 11-03-2009, 08:00 PM   #197
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Guys,

does anyone know the diameter of the rotors on the x12?

I ask as Tamiya are bringing out 12mm rotor versions of their x12 (the current one's part 42125 etc are x12 aren't they?) but I can't find anywhere what the older motors had in, and therefore the difference in performance etc!?

I assume whatever a standard x12 is would also be the old Tamiya diameter!
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Old 11-04-2009, 12:03 AM   #198
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@radwerx: kV rating is not affected too much by sensor timing, therefore we don't give different ratings for different timings. So you can go with 7100kV for 5.0t at -10° (oooo insert) as well.

@DaveG28: standard in all X12 motors is 12.5mm rotor, Tamiya specially requested a 12.0mm rotor in their new motors but ourselves we stick to 12.5mm as we feel this is the best allrounder!
We do offer optional rotors in 12.0mm and 13.0mm too, you found all part numbers at www.lrp.cc
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Old 11-04-2009, 11:19 AM   #199
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@radwerx: kV rating is not affected too much by sensor timing, therefore we don't give different ratings for different timings. So you can go with 7100kV for 5.0t at -10° (oooo insert) as well.

@DaveG28: standard in all X12 motors is 12.5mm rotor, Tamiya specially requested a 12.0mm rotor in their new motors but ourselves we stick to 12.5mm as we feel this is the best allrounder!
We do offer optional rotors in 12.0mm and 13.0mm too, you found all part numbers at www.lrp.cc
Thanks for the answer, I assume the earlier motor is an X12 12.5mm rotor (thinking part 42125?)? Am I right in thinking the 12mm will also be less efficient and run hotter?

Dave
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Old 11-05-2009, 01:38 AM   #200
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@DaveG28: actually these questions you should ask Tamiya as it's their motor...

Generally speaking, a smaller rotor improves driveability (smoother) and gives more topend but the downside is slighly lower efficiency and less torque. Temperature isn't much different.
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Old 11-05-2009, 04:04 AM   #201
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@radwerx: kV rating is not affected too much by sensor timing, therefore we don't give different ratings for different timings. So you can go with 7100kV for 5.0t at -10° (oooo insert) as well.

[/url]
Thanks burito. So am I right to say that I will not gain much top end speed with mechanical timing advance?

Will you recommend simply gearing higher (lower FDR) to gain top end speed then? 'Cos I am running an FDR of 7.0 currently on a relatively large track and the car still doesn't fast enough on the straights. Given the history of the X-12 i am worried about gearing any higher.
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Old 11-22-2009, 04:13 PM   #202
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when will the x12 stock spec motors be released? mainly the 13.5t and 17.5t.
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Old 11-22-2009, 04:26 PM   #203
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when will the x12 stock spec motors be released? mainly the 13.5t and 17.5t.
They are already on the market.
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Old 11-22-2009, 07:24 PM   #204
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what timing block should we be using on the spec motors with the timing advancing esc's?
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Old 11-22-2009, 07:31 PM   #205
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Quote:
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what timing block should we be using on the spec motors with the timing advancing esc's?
I have dyno'd the 17.5 and 13.5 Friday and ran both today in TC. I found that even with the -10 block in them they dyno WAY better than any Duo or Duo2 motor Ive ever dyno'd on everything except EFF. They are about 2-3 points lower on eff than the others. Other than that they blow away the others currently available. They are closest on the -10 setting to the Duo based motors. I ran today with the -5 and 0 plug. I think they were best with the -5.

Dont be afraid to let them get a little hotter too. THey dont mind the heat!

EA
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Old 11-22-2009, 07:45 PM   #206
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EA...

which motor are you talking about ....?
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Old 11-22-2009, 08:13 PM   #207
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EA...

which motor are you talking about ....?
LRP X12 17.5 and 13.5 motors.

EA
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Old 11-22-2009, 08:37 PM   #208
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Quote:
Originally Posted by EAMotorsports View Post
I have dyno'd the 17.5 and 13.5 Friday and ran both today in TC. I found that even with the -10 block in them they dyno WAY better than any Duo or Duo2 motor Ive ever dyno'd on everything except EFF. They are about 2-3 points lower on eff than the others. Other than that they blow away the others currently available. They are closest on the -10 setting to the Duo based motors. I ran today with the -5 and 0 plug. I think they were best with the -5.

Dont be afraid to let them get a little hotter too. THey dont mind the heat!

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Old 11-22-2009, 08:39 PM   #209
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Who has them in stock in the States?
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Old 11-22-2009, 08:48 PM   #210
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Quote:
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Who has them in stock in the States?
Towerhobbies.....

I got a chance to run them in *coughdirtcough*, but they were incredibly fast even without any timing assistance.

Interestngly, the instructions for the motor do not recommend using profiles 7 & 8!

There is also a set-up on the AE site from Mr. Cochran using the 13.5 with a pretty high FDR on profile 6 (FDR 6.3 IIRC).

Mike Slaughter
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