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Omni Cidex controller brakes


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#1 Chad M.

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Posted 30 January 2019 - 06:18 PM

There are certain slot cars, especially the heavier ones, that I can't get enough brakes going into corners. I'm wanting to add a second potentiometer to the circuit to get the additional brakes when needed.

The standard settings work just fine for my Flexis and Womps... Need more brake for FCR frames (Hardbody and Modifieds)...

So is this possible, and will it work?
Chad Mervine




#2 nicky 65

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Posted 30 January 2019 - 06:39 PM

My advice to you is buy a better controller...……………..Third eye is my favorite out of the Big 3 or 4 manufactures


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#3 Ramcatlarry

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Posted 30 January 2019 - 07:32 PM

On ALL controllers, the maximum brakes are found with no resistance between the red driver post and the black trigger post.  The full power is fullest when there is no resistance from the white post to the black post.  A blast relay reduces that resistance for full power.  Some controllers have added a brake relay to reduce that brake side resistance.

 

Any potentiometer is a variable resistor and adding another one does not improve brakes.

 

The Omni is switched brakes. 2nd and 3rd position is circuited though one and two diodes. The top(1st) position is full brakes and the 4th position is no brakes - and where you can add a potentiometer for variable brakes if the two switched positions are not to your liking.

 

Clean all contact points and solder as many crimped wires as possible for least resistance.  Gear ratio might be an issue. Try a smaller pinion or bigger crown for more brakes and less overheating of the motor.

 

I like my Omni on ovals and use the 2nd position switch for partial brakes.


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Larry D. Kelley, MA
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race directing around Chicago-land

 

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#4 slotcarone

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Posted 30 January 2019 - 08:27 PM

I used an Omni for many years and it always had great brakes. I had installed the brake adjuster from my  old Difalco External resistor controller that I don't use anymore for greater adjustment.


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#5 Chad M.

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Posted 30 January 2019 - 09:21 PM

On ALL controllers, the maximum brakes are found with no resistance between the red driver post and the black trigger post.  The full power is fullest when there is no resistance from the white post to the black post.  A blast relay reduces that resistance for full power.  Some controllers have added a brake relay to reduce that brake side resistance.
 
Any potentiometer is a variable resistor and adding another one does not improve brakes.
 
The Omni is switched brakes. 2nd and 3rd position is circuited though one and two diodes. The top(1st) position is full brakes and the 4th position is no brakes - and where you can add a potentiometer for variable brakes if the two switched positions are not to your liking.
 
Clean all contact points and solder as many crimped wires as possible for least resistance.  Gear ratio might be an issue. Try a smaller pinion or bigger crown for more brakes and less overheating of the motor.
 
I like my Omni on ovals and use the 2nd position switch for partial brakes.

So if I'm understanding you correctly... I could leave original SW in 4th position and add another Pot in line to have better/more control over brakes?

Chad Mervine
Chad Mervine

#6 Eddie Fleming

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Posted 30 January 2019 - 09:41 PM

To me better brakes would mean the car stopping quicker. That is not the same thing as more control of the brakes. The pot could give you more breaking control but not better brakes.


Eddie Fleming

#7 Ramcatlarry

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Posted 31 January 2019 - 11:36 AM

ANY controller will have maximum braking action when the circuit has the least resistance.  Corrosion, crimped connections, bad solder joints contribute to controllers not doing what they should.  When the controller is right and the brakes are still an issue, THE CAR gearing and specific motor irregularities may be the MAJOR issue.  Motors with smaller, thinner magnets will always have less braking than ones with more magnet mass or stronger magnets.

 

The hardbody cars we run in the MidAmerica series run 150 - 230 grams...with one inch tires.  Falcon and Hawk-7 motors run out of brakes quickly from overtaxing the power band.  We now use PS 4002FK motors with 7T pinions and 31-34T crowns for different tracks.  Got to keep the motor cool and running in the power range.  Overheated motors fail much quicker.


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Larry D. Kelley, MA
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race directing around Chicago-land

 

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