Diff Flip...

[patrol_maverick]

Just a question about the RTR Wraiths. Once I've flipped the diffs around, I reverse the throttle switch, correct? Not reverse the motor polarity?
Do the Wraiths have brakes on forward and reverse, or forward only (like my old E-maxx's)? I just didn't want to swap things around and find out I have no brakes going forward.

[forbnmad1]

is your throttle channel reversed to make it go the right way? if No, do nothing because its correct. if your throttle channel is reversed to make it go the right way and it goes fast in reverse, flip your diff centers then put the channel back to normal and leave your motor wires connected the correct way. im assuming this is the issue youre talking about. not all the RTR wraiths had this issue,, just most. talking about drag brake, im not sure if it is programmed to have any in reverse but im sure someone else can chime in for that one

[Dukk]

Ok - why flip the diff spool?

Is this an RTR only thing (I'm thinking it has to do with brushed motor timing) or should I pull the diffs back out of my half completed kit and flip em around?

[Heath]

What is the reason for this?

[k7zpj]

Originally Posted by Dukk

Ok - why flip the diff spool?

Is this an RTR only thing (I'm thinking it has to do with brushed motor timing) or should I pull the diffs back out of my half completed kit and flip em around?

If you are building from a kit, then you need to put them back the way the instruction book shows them.

Some RTR's came with the diffs installed the wrong way.

[Jeepfixer1]

Those crazy Axial assembly line workers. Now that's what you would call getting it all bass-akwards!

[Boostmeister]

I had a similar issue. I purchased the ARB diff covers and to make them fit you have to flip in guts of the diffs around but then it runs backward so I changed the switch on the radio and it ran the correct way BUT faster in reverse than forward?? I have since changed the radio switch back and flipped the motor wires to change polarity and now it all seems to work fine however I haven't tested the brake as yet??

[patrol_maverick]

Originally Posted by Dukk

Ok - why flip the diff spool?

Originally Posted by Heath

What is the reason for this?

Judging from what I've read from a couple of threads, word has it that most RTR Wraiths had the diff centres installed the wrong way around.
One of my questions (from another post) was about my Wraith being faster in reverse. The answer was the diffs are installed backwards causing the car to run the wrong way when the trigger is pulled. Instead of disassembling thousands of Wraiths, Axial simply reverses the switch on the transmitter to compensate for it. So cheap fix for Axial = PITA for us to fix. The Wraith is faster in reverse, because 'reverse' on the trigger is actually intended to be the 'forward' direction.

If I had actually thought to check my reversing switch before posting, I could have answered my own question. Atleast it's been put out there for others.

Originally Posted by Dukk

Is this an RTR only thing (I'm thinking it has to do with brushed motor timing) or should I pull the diffs back out of my half completed kit and flip em around?

It's a RTR thing. If you are assembling from a kit and followed the picture in the manual, you should be OK. (Unless the manual is wrong too)

[Ty@Tekin]

Originally Posted by Boostmeister

I had a similar issue. I purchased the ARB diff covers and to make them fit you have to flip in guts of the diffs around but then it runs backward so I changed the switch on the radio and it ran the correct way BUT faster in reverse than forward?? I have since changed the radio switch back and flipped the motor wires to change polarity and now it all seems to work fine however I haven't tested the brake as yet??

If you flip the diffs it will change the wheel rotation. Switching the transmitter just reverses the signal, so the ESCs "Forward" will move the rig in reverse. You did right by changing the motor wires and putting the switch back to normal, because now forward on the ESC is forward on the motor as well.

[Tonysmini]

Check the direction your motor spins and it's timing, I flipped mine, swapped the wires then burnt out a good 21t motor 10 minutes later as it was running the opposite way to it's timing.

[Dostradamas]

So if the servo reversing switch on the tx is in the "normal" position & it goes forward when I pull the trigger can I be sure my RTR was put together correctly?

[Solitaire]

Green light on ESC - forward
Red light on ESC - backward
If motor is wired correctly and not reversed, you should be good to go.
Zero timed motors will run equally as well wired correctly or reversed.
Yes, there is drag brake on both forward and reverse with the stock AE-2 ESC.

[dieselmudder]

okay, heres a brain bender. got my wraith used. but it was an rtr. motor has already been replaced with a traxxas. with tx in normal esc green light is reverse. ive got axial esc black wire to traxxas motor black wire. and axial white to traxxas red. is this proper polarity? im just gonna go out on a limb an guess the axial motor has black and white wires, so my polarity would be correct and i need to do this diff swap. is it as simple as pulling the differential out, rotating it 180* an putting it back in?

[patrol_maverick]

Originally Posted by dieselmudder

i need to do this diff swap. is it as simple as pulling the differential out, rotating it 180* an putting it back in?

It should be that simple, but... When I did mine last night, I found the short axle on the rear wouldn't go in far enough, so the screw holes in the straight axle adaptor wouldn't line up. It was out by about 1mm. With the diff installed the wrong way, it would fit fine. With it installed the right way, it wouldn't fit properly. Same thing happened when I tried the front diff in the rear.
I drilled out the back of the gear today so the axle could sit 1mm further in and it fixed the problem. I'm not sure why it had this issue. I guess it's just a machining fault because there's no shims or adjustments in there.
The front doesn't have the same problem because the dogbone allows for minor intolerances.
Anyone else had the same problem?

[Natedog]

Originally Posted by Ty@Tekin

If you flip the diffs it will change the wheel rotation. Switching the transmitter just reverses the signal, so the ESCs "Forward" will move the rig in reverse. You did right by changing the motor wires and putting the switch back to normal, because now forward on the ESC is forward on the motor as well.

Yes.

Originally Posted by Solitaire

Green light on ESC - forward
Red light on ESC - backward
If motor is wired correctly and not reversed, you should be good to go.
Zero timed motors will run equally as well wired correctly or reversed.
Yes, there is drag brake on both forward and reverse with the stock AE-2 ESC.

Yes.

Originally Posted by patrol_maverick

It should be that simple, but... When I did mine last night, I found the short axle on the rear wouldn't go in far enough, so the screw holes in the straight axle adaptor wouldn't line up. It was out by about 1mm. With the diff installed the wrong way, it would fit fine. With it installed the right way, it wouldn't fit properly. Same thing happened when I tried the front diff in the rear.
I drilled out the back of the gear today so the axle could sit 1mm further in and it fixed the problem. I'm not sure why it had this issue. I guess it's just a machining fault because there's no shims or adjustments in there.
The front doesn't have the same problem because the dogbone allows for minor intolerances.
Anyone else had the same problem?

This diff flipping was done to somewhat remedy the improperly made rear axle short shaft. All of these issues have been covered in detail many times and searching and reading help resolve many issues. FYI, not aiming this at any one individual, just there are many threads regarding all of the above with cause, effect and solutions.

[dieselmudder]

this was the first i'd heard anything about it. havnt had mine long an just recently started reading the wraith threads.

[Dukk]

Originally Posted by k7zpj

If you are building from a kit, then you need to put them back the way the instruction book shows them.

Some RTR's came with the diffs installed the wrong way.

Fantastic.

The stock RTR brushed motor has zero timing? hm.