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Hi, I would suggest if your presently useing either Parma Eco's or Parma Plus controller's that you add on to them basic adjustable brake's/ sensativity control's all item's can be bought from Maplin's including a encloseure for under £20 and would give you an insight how it can give your car's better driveability. phil.
 

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Hi, using resistor's in parallel with the main controller resistor only allows the ohm's rating to be reduced but you retain the 'feeling' of the original resistor, I have both Eco/Plus controller's and have modified both in different way's when first trying different add-on's. Putting a 10ohm pot in series with the resistor on a Eco handle I made a separate full power contact for the wiper arm to touch as it reached the resistor full power band attached the power in (white cable) to this new contact then another wire from this to the pot which was on a bracket on front of controller handle the other wire from pot to resistor full power band it gave added resistance but didn't give the suitable feel, the Plus controller has it's own separate full power contact. Adding resistor's/pot's or rheostat's in parallel it's still linear until the added resistance is reduced to far 10ohm is the limit we use this for Johnson motor's we race going below this does make the car erratic, I started using a 45ohm main resistor but it felt a bit soft on response so changed to 35ohm this with mag and nonmag car's on our wood /plastic track's currently these type of controller's at the club use this with 3watt wirewound resistor's soldered vertically around a 1pole 12 position rotary switch starting with 180ohm and depending on how many step's you wish to have( I have 11step's ) then 150,100.68.47.33.27.22.18.15.10 as to the brake control you can use 1amp schottky diode's 1n5817 on another rotary switch.As said earlier doing it this way you have the feel that your used to from your controller over the trigger range yet are able to increase the car's speed gradually as you run the car round a number of lap's at each setting and adjusting the brake's also you start to get more control of the car without realizing how fast your able to push the car and how much adjustment youv'e made it's then you want to zero both control's and run it again and see how slow and less driveable it is the way you run it before.Haveing a softer trigger spring help's alot aswell ( I know some prefer a strong spring but onece you give your self some time with it it add's extra to the control of your car,back to the post about a 60ohm the power in this case would be coming in to far down the resistor to be suitable if you run with lot's of mag's you can go the other way to a 25ohm where the quicker responce is enhanced more but to much for nonmag raceing. phil.
 
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