GTXR conversion- version 2
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Gt stator/ Xr rotor conversion- version 2
I bought a few 5 1/2" x .90" billet 6061 aluminum blanks to machine a XR endplate for the GTXR conversion.
The most nerve racking part was machining the bearing pocket which had to be exact for a press fit wheel bearing.
In the photo where I was cutting the "o" ring groove, I started to cut the groove in the wrong area, just caught myself in time!
This end plate is heavy duty compared to the cast XR endplate and is more precise where the endplate fits into the hub.
This is personal use only and none are for sale
I'm sure the aftermarket will fill the need.
There is nothing wrong with the shim method, I just wanted something different.
Also. I will be working a solution to bring the Xr hub back on center between the GT rails, it off by about 0.130" towards the right hand side.
I purposely left a lot of material at the hole where the axle goes through for an oil seal if I can find a 35mm thin seal.
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@lemur I wasn't expecting you to make an entire hub plate, this is great!
Does it ride well or are you waiting to do the re-centering before trying it? -
@lia I'm actually waiting for a Burris tire for this, I robbed the wheel off my Xr to test.
I have an oil seal on order to seal the endplate bearing, I have an extra Xr hub , but no tire. I may upgrade to 14 bolts instead of the present 7 just because. -
What an eye-catching thread! Thanks for sharing the beauty @Lemur
Proper simmer ring seal instead of 3D-printed counterpart by 3rd parties -- oh dang, feels like mandatory. Come on FM! Doesn't sound like big challenge.
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@lemur said in GTXR conversion- version 2:
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So beyond me, yet so so cool!
Used to be 2 options: get a GT, sell your XR or get a GT and keep your XR . . . now there's a 3rd, get a GT and merge it with your XR!
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maybe I do see a gt in my future, not ordering one till I'm sure the bugs are gone
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@Lemur Silly, silly question sry for asking i missed a lot lately:
What was the reason again that the XR hub cant be put directly into the GT?
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@maciak The GT stator axle has a shoulder where it butts up against the end cover bearing the is 0.064' -0.070" longer than the XR/Plus stator and the XR end cover won't bolt down flush.
There is a gap of 0.064"-0.070", that why a shim, custom end cover or milling a deeper seat for the bearing on the side opposite the end cover is needed.
Also Bob Nicolson just posted on FB that the GT stators are also paired to the controller, he thinks there's a chip in the motor connector. I can't see an extra chip on the little circuit board where the hall sensors are soldered. -
@lemur Thanks. So it has nothing to do with rumors the GT stator being able to provide more power or so?
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@maciak I don't think so, looks identical to the XR/PLus stator , lust more voltage in the GT.
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@lemur Agreed, I haven't seen anything to prove the actual hardware has been adjusted now that we've seen inside. Both appear functionally identical to prior models other than that tiny extended lip. Can safely say it's put to rest the rumours including my prior assumptions.
Curiously has anyone benchmarked the stock GT hub vs a modified XR hub on the same GT board to verify any performance shifts? I wouldn't expect a noticeable change but since there is a minor exchange from rubber to aluminium it's possible there's a tiny weight shift.
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First, I will not have into account the hub pairing, as it was discovered just a day ago or so... So please disregard this aspect for my entire comment.
Obviously people are starting doing the GT stator-> XR rotor conversion, I guess because the connectors are different. Otherwise, with your theory, doesn't make any sense to do the frankenstein, if you could use directly the XR hub (if it is the same, why not trying to use the entire XR hub instead of doing the mix, trying to create a compatible adapter, being the same?)
What I have heard, is that the GT is 3 hp not just because the battery, but the hub is not locked as the XR is. The XR is locked by design in the circuitry to not go further certain currents, rpms, etc... while the GT has increased limits.
And this, assuming that the stator is the same, are we 100% sure that it is? maybe different KV or something?? Maybe something internal that we can't see?
Just talking loud and guessing, not having any trustful information, just what I have read outthere
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@ed_co I've been riding the GT before and after GTXR conversion , I don't notice any difference in power delivery, the only difference is in the handling due to the Burris tire I'm using.
The carving is the same as my XR with the same tire which is great, just waiting on the TFL Enduro tire now, I had to lower the stock Gt tire down to 10 psi for my weight to ride comfortably.
To use the XR/Plus complete wheel, assuming that the GT wheel is not paired, I would have to cut the GT motor cable, since the connector is proprietary. Since it's still under warranty, and I don't want to do anything that is not reversible. -
@lemur said in GTXR conversion- version 2:
@ed_co I've been riding the GT before and after GTXR conversion , I don't notice any difference In power delivery, the only difference is in the handling due to the Burris tire I'm using.
Obviously, you are using the same stator... I was talking about a possible change they could made in the stator, which could make the GT hub more poweful... not the rotor, which is just a case with magnets.
The carving is the same as my XR with the same tire which is great, just waiting on the TFL Enduro tire now, I had to lower the stock Gt tire down to 10 psi for my weight to ride comfortably.
Enduro rocks man, I am sure it will be kick ass ;)
To use the XR/Plus complete wheel, assuming that the GT wheel is not paired, I would have to cut the GT motor cable, since the connector is proprietary. Since it's still under warranty, and I don't want to do anything that is not reversible.
I was not thinking about cutting, but make an adapter. I am sure there would be a way to do it (even with a 3d printer if needed, I have seen amazing things done by Lia, making even custom connectors with a 3d printer). This would show us if the hub is actually the same power or not as the XR one.
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Hmmm... I could probably use a GT hub with an XR stator on my Plus, right? That is if I did not mind the hard ride and was willing to deal with the tire when it wore out. Someone will likely want to rid themselves of one. I will keep an eye out, and if you know of anyone who wants to part with a GT hub let me know, thanks.
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@s-leon I think until the warranty period ends, you won't see any GT rotors on the market.
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@s-leon said in GTXR conversion- version 2:
I could probably use a GT hub with an XR stator on my Plus, right?
The GT stator doesn't fit in the XR hub without modification of one of the two. Would this also be the case for the other way around? Is it possible the wheel could float left and right (the 1.6mm, or whatever) as you rode?
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@biell said in GTXR conversion- version 2:
Is it possible the wheel could float left and right (the 1.6mm, or whatever) as you rode?
I guess with a shim on the axle to accommodate the gap would be fine.
Wonder if the OD of the axle matches standard sized tubing. Could match the OD with some aluminium tube that has a matching ID (maybe a hair bigger for tollerance) instead of machining out a chunk of aluminium stock.@Lemur Was there any other chips or additional pins on the motor connector for the GT? I've heard rumours a hub swap prevents the GT booting as if they managed to serialise it. Curious if it's something on the hall sensor PCB or they moulded something into the connector as we saw with the charge connector.
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@biell You would have to shim the XR stator to fit ibn the GT rotor.
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@lia I just tried disconnecting the motor cable and a red flashing error code comes up when it's powered up, and I forgot to count the flashes, duh.
The circuit board on the Xr and GT looked similar but when I had it apart, but I wasn't looking for any differences because we didn't know about the married stator at the time.
The motor connector has the usual 3 large phase and 6 small pins for hall(3) 5v, ground and temp. Some people are speculating something may be in the large motor connector , which is molded something like the charger plug which has a chip in there.
