beetlebug Posted January 26, 2011 Share Posted January 26, 2011 Hi, just upgraded my sons Maverick Strada SC with an HPI Firebolt 15t motor, but motor turns in opposite direction to old motor so truck reverses when trying to go forward. To correct this i moved the throttle reverse switch on the radio. Is this normal?? Also with old motor by pushing trigger forward truck would brake but now if i do this it goes straight into reverse!!! Many thanks. Quote Link to comment Share on other sites More sharing options...
Smithy111 Posted January 26, 2011 Share Posted January 26, 2011 Flick the tx switch back and swap the wires over on the motor Quote Link to comment Share on other sites More sharing options...
beetlebug Posted January 27, 2011 Author Share Posted January 27, 2011 Right my son took truck for a spin and it runs quite slow going forward but goes fast in reverse. Any ideas???? Quote Link to comment Share on other sites More sharing options...
joe of loath Posted January 27, 2011 Share Posted January 27, 2011 The ESC is running in reverse mode to go forwards, and forwards mode in reverse. Have you swapped the motor wires around yet? Quote Link to comment Share on other sites More sharing options...
beetlebug Posted January 27, 2011 Author Share Posted January 27, 2011 (edited) Yes swapped wires around on motor and put switch back to normal but still same problem. Edited January 27, 2011 by beetlebug Quote Link to comment Share on other sites More sharing options...
joe of loath Posted January 27, 2011 Share Posted January 27, 2011 Very strange. Does your ESC have a setup button, or is it auto setup? Quote Link to comment Share on other sites More sharing options...
beetlebug Posted January 27, 2011 Author Share Posted January 27, 2011 Auto set up i think.....i am new to all this!!! Quote Link to comment Share on other sites More sharing options...
beetlebug Posted January 28, 2011 Author Share Posted January 28, 2011 Took truck out again today and it seems to go slow at first then speeds up on slight down hills but will not speed up on very slight uphills but seems to go fast reversing up hill!!! I am very confused!! Quote Link to comment Share on other sites More sharing options...
Smithy111 Posted January 28, 2011 Share Posted January 28, 2011 As already said above your ESC is running in reverse mode. Swaping the positive and negative around should make the motor turn the other way, is you battery connected up correctly? Quote Link to comment Share on other sites More sharing options...
Garry Posted January 28, 2011 Share Posted January 28, 2011 Right, auto setup means the ESC learns which direction is which, and thats that. It won't change. The speed difference is easy to spot on the ESC, the ''Forwards'' direction gives 100% power, the ''Reverse'' direction gives around 40-50% power, so you don't have an uncontrollable car going backwards. Also, to give a degree of braking effect theres a delay between travelling in one direction, then going in the other direction: Forwards to reverse movement = 2/3secs delay Reverse to forwards movement = no delay The motor is probably built with advanced timing, so it'll rotate faster in one direction than the other, but on the Firebolt, you can't change the amount of timing so that is fixed. For the time being, try and match the faster revving side of the motor movement to the ''Forwards'' direction on the ESC. Once those are matched, then try to make that move the car fowards. You might need to flip the diffs around. The switch on the transmitter just affects which way you push the trigger to make it go. It doesn't solve the problem on its own as you've found out. So basically, I'd do this: Step 1. Put swtich on transmitter to NOR Step 2. Wire motor to ESC, Pos to Pos, Neg to Neg Step 3. Sit the truck on a block so the wheels can rotate (or take the pinion off) Step 4, Turn everything on and see which side of trigger movement does what (in terms of delay and RPM). If pulling the trigger back makes the motor rev higher than pushing it forwards, try full throttle, then go full reverse and see if there is a delay. If there is, go to Step 6. If there isn't, then swap the motor wires over, flick the switch on the transmitter and try Step 4 again. Step 5, Put the pinion on (or put the car down) and see what the throttle direction on the transmitter does in relation to driving the car. Step 5, If its still backwards, then the diffs will probably need flipping over inside each gearbox casing. Read this for a similar issue: Quote Link to comment Share on other sites More sharing options...
beetlebug Posted January 29, 2011 Author Share Posted January 29, 2011 Hi guys thanks for all your help but still having problems. I have tried what gary suggested but however i wire motor or whatever position switch is on radio, truck still moves slower going forward. The only time it will speed up going forward is going down a very slight hill but takes time to reach full speed. It still goes fast going backwards up and down hill. Another point is the radio has a "N" and a "R" position. not sure which is which now as when new it was in the "R" position. Also original motor did same speed forwards and reverse. Is this motor different? Gary also mentioned flipping the diffs over. What does this do and is it an easy-ish job for a novice? Thanks again for all your help!! Quote Link to comment Share on other sites More sharing options...
wickedgeezer Posted January 29, 2011 Share Posted January 29, 2011 take some photos of it all, it may help Quote Link to comment Share on other sites More sharing options...
Smithy111 Posted January 29, 2011 Share Posted January 29, 2011 n = normal r =reverse. Just flip the diffs over that will deffinatly solve your problem. Quote Link to comment Share on other sites More sharing options...
beetlebug Posted January 30, 2011 Author Share Posted January 30, 2011 Thanks for all your help guys. Flipped the diffs and now running like a dream!!! Quote Link to comment Share on other sites More sharing options...
Garry Posted January 30, 2011 Share Posted January 30, 2011 Brilliant. Quote Link to comment Share on other sites More sharing options...
lorrylemming Posted January 30, 2011 Share Posted January 30, 2011 I'm going to annoy you all now but how does flipping the diffs solve the problem? I can't see it at all. Quote Link to comment Share on other sites More sharing options...
joe of loath Posted January 30, 2011 Share Posted January 30, 2011 It reverses the rotation of the diffs in relation to the driveshaft. Be careful when working on one end at a time, if you put the diff in backwards the wheels will turn in opposite directions Quote Link to comment Share on other sites More sharing options...
lorrylemming Posted February 1, 2011 Share Posted February 1, 2011 Sort of got you, so when the shaft spins one way, it makes the difff spin one way but flipping it the shaft still spins the same but the diff swaps. Quote Link to comment Share on other sites More sharing options...
joe of loath Posted February 1, 2011 Share Posted February 1, 2011 Sort of got you, so when the shaft spins one way, it makes the difff spin one way but flipping it the shaft still spins the same but the diff swaps. Yup! Quote Link to comment Share on other sites More sharing options...
Jamo Posted April 7, 2011 Share Posted April 7, 2011 sorry to be simple but how do yuo flip the diffs...i need to do this to sort out the same problem..? Quote Link to comment Share on other sites More sharing options...
Garry Posted April 7, 2011 Share Posted April 7, 2011 Simple, look at this picture of an Associated RC18T: That is the diff fitted in one direction, so the motor spins it to get movement. To flip it and get opposite movement, take the diff out and rotate it 180 degrees so the main gear is on the opposite side of the gearbox casing. Then, reassemble! Quote Link to comment Share on other sites More sharing options...
Jamo Posted April 7, 2011 Share Posted April 7, 2011 perfect reply,thanks again Garry.. Quote Link to comment Share on other sites More sharing options...
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