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Old 04-05-2012, 06:48 AM   #886
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Originally Posted by theatriks View Post
Anybody ever run a 4.5 turn motor off this speed control
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You should have no problem running 4.5t on this speedy just make sure you check temps after 2 minutes when practicing to be safe and dont overgear the motor. I have seen these speedy been used and I am going to be using this speedy in australia where the weather is hot with no major problems. Plus they are weapon fast
Nearly all BD's out there are LV's and will need a fan to be able to run Mod TC. 4.5 will be pushing it for a LV. Jono yours is a TC version with fan and larger heatsink and is fine for most 4.5 motors. A 4.5 on a LV even with a fan is going to depend on ambient temps.
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Old 04-05-2012, 06:51 AM   #887
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Paul,

You have PM.

Regards,
Brent
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Old 04-05-2012, 08:10 PM   #888
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The Side Piece "Seis" fan fits on the ESC perfect. It's 25x25x15 and moves a lot of air when you plug it into the receiver. I picked up some 16mm M2 screws from McMaster Carr, and they have plenty of thread to hold the fan in place.

I'm gonna give it a go in mod in a couple of weeks, I'll report back with temps using the fan.
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Old 04-06-2012, 04:42 AM   #889
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This page says 2S down to 7.5T

http://www.modeltech.co.uk/catalog/p...6cba2418a1209c

However the speedo has two layers of Mil spec FET's which are directly against the inside faces of the case and is rated constant current of 150A, extremely high for such a small speedo.

For the sake of an email it seems sensible to contact Per first before strapping in the 4.5
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Old 04-06-2012, 07:19 AM   #890
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Ive been running a reedy 4.5 turn on my BD (no timing, no boost) and let me tell you after a 10 minute run i could use this speedy as an ice cub for a drink thats how cool it runs.
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Old 04-06-2012, 07:40 AM   #891
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Originally Posted by hana166 View Post
This page says 2S down to 7.5T

http://www.modeltech.co.uk/catalog/p...6cba2418a1209c

However the speedo has two layers of Mil spec FET's which are directly against the inside faces of the case and is rated constant current of 150A, extremely high for such a small speedo.

For the sake of an email it seems sensible to contact Per first before strapping in the 4.5
Doug, did you say at WLRC use motor timing for mid or top end?

I moved the start timing to 7000rpm and it did help with low end torque but didn't seem to make any difference to temps.

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Last edited by Skiddins; 04-06-2012 at 08:47 AM.
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Old 04-06-2012, 01:29 PM   #892
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The can timing affects the entire rev range so lifting the start rpm allows the can timing to take care of the bottom end without being overtimed, and you can add an appropriate amount for the midrange.

I'm going to try start 12500-14000 next time, and add a further 5 degrees to the can to compensate, effectively adding 5 to the top but hopefully avoiding heat issues as the start is so high. Alternatively might add this to top timing over 19600 instead

At the moment its +10 from default (40 on the can) FDR 6.4 (to get the brake), 50deg mid starting at 7000 no turbo. Its competitive right now, but have a feeling it could be devastating if exactly the magic set up can be found
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Old 04-07-2012, 05:23 AM   #893
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The can timing affects the entire rev range so lifting the start rpm allows the can timing to take care of the bottom end without being overtimed, and you can add an appropriate amount for the midrange.

I'm going to try start 12500-14000 next time, and add a further 5 degrees to the can to compensate, effectively adding 5 to the top but hopefully avoiding heat issues as the start is so high. Alternatively might add this to top timing over 19600 instead

At the moment its +10 from default (40 on the can) FDR 6.4 (to get the brake), 50deg mid starting at 7000 no turbo. Its competitive right now, but have a feeling it could be devastating if exactly the magic set up can be found
Unfortunately the high torque rotors didn't arrive this week so will have to test at WLRC next weekend.
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Old 04-07-2012, 06:53 AM   #894
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Hi Guys,

Could someone give me a starting figure for rollout or fdr for an 17.5 X12 with a BD... will save me time I don't have atm..

Many Thanks in advance
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Old 04-07-2012, 08:54 AM   #895
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I'm underwhelmed by the brakes in 13.5 sedan.
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Old 04-07-2012, 10:22 AM   #896
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Hi Guys,

Could someone give me a starting figure for rollout or fdr for an 17.5 X12 with a BD... will save me time I don't have atm..

Many Thanks in advance
I can't help with specifics for 17.5 but if on the old software, run it in profile 4 or you'll cook the motor.
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Old 04-07-2012, 10:23 AM   #897
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I'm underwhelmed by the brakes in 13.5 sedan.
Brakes seem to be very much dependant on the amount of timing, the FDR and the specific motor.

How much are you using on the ESC?
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Old 04-07-2012, 10:35 AM   #898
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A setup to get the best of both worlds, bottom and top end, would be to run 30 from 0 to 19600rpm and 50 past 19600 ramped evenly to 36000rpm.... You can even gear lower, around 7.6FDR to get more punch out of the corners, and reduce heating issues.....
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Old 04-07-2012, 10:41 AM   #899
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By the way , if you switch to 3.5t or 2.5t motor and use the same concept but only cranking the timing to 45 , you will be uncatchable...
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Old 04-07-2012, 12:34 PM   #900
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Originally Posted by Skiddins View Post
Brakes seem to be very much dependant on the amount of timing, the FDR and the specific motor.

How much are you using on the ESC?
Profile 1 (2.1 software) for "blinky." FDR is 5ish. Motor is a TP with physical timing around 40.
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