333LikesXray XB2 2WD Buggy Thread
05-04-2019, 06:44 PM - Wikipost
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02-10-2017, 05:36 AM
#4576
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02-10-2017, 06:08 AM
#4577
https://m.facebook.com/groups/1729446347300369?view=permalink&id=175720274785806 2
See xb2nation narrative. Yes, they do. But, you will need Yokomo dogbones too which are about $16 a pair. There are 2 options for dogbones. Either the bmax 62.5mm bones or some new 65mm bones. You use the whole Yok ball diff with the exception of the gear (use the XRAY gear as it has 1 more tooth), some shims each side and Yok Dogbones. The newer lighter bones require a bit more shimming. I have all the parts and plan to try it this weekend. I believe it's the same process for the TLR diff too with the Yok dogbones.
See xb2nation narrative. Yes, they do. But, you will need Yokomo dogbones too which are about $16 a pair. There are 2 options for dogbones. Either the bmax 62.5mm bones or some new 65mm bones. You use the whole Yok ball diff with the exception of the gear (use the XRAY gear as it has 1 more tooth), some shims each side and Yok Dogbones. The newer lighter bones require a bit more shimming. I have all the parts and plan to try it this weekend. I believe it's the same process for the TLR diff too with the Yok dogbones.
So what is the part number for these bmax2 v3 rr dog bones? I cannot seem to locate them.
Edit..... forget this. I'm just getting the X-ray ball diff. Less screwing around and won't be that much more $ after buying everything needed for the yoko swap
02-10-2017, 08:09 AM
#4580
Ball diffs and gear diffs behave very differently. Under load a ball diff has a constant feel, as forces acting upon the diff changes, the action of the diff is constant whether the force is increasing of decreasing. Since a gear diff uses fluids there are shear rates involved, when forces that act upon the diff, the shear rates changes thus the diff action changes. A gear diff tends to lock up the more the forces acting on it increases, this may cause an increase in forward drive in high bite conditions and in low bite conditions it may cause instability or make the car feel lose.
Last edited by Slapjack; 02-10-2017 at 08:32 AM.
02-10-2017, 08:43 AM
#4581
Exotech had a news release days back of even a lighter slipper eliminator designed only for that purpose.
http://www.liverc.com/news/new_produ...ct_spur_mount/
http://www.liverc.com/news/new_produ...ct_spur_mount/
02-10-2017, 08:52 AM
#4582
Any rotating mass that can be removed helps with 17.5 classes
02-10-2017, 09:35 AM
#4583
reducing rotating mass (RM), even what seems to be minor grams has a greater effect on acceleration and cooler motor operation that removing major grams/ounces off your car.
two weight legal 1500 gram cars and lets say equal skill drivers
car A - uses a stock drive train, CVDs, outdrives, slipper, but has alot of trick chassis lightening stuff, this car may have handling issues due to weight taken from various parts of the car and affects handling. facing car B in neck to neck driving will notice car B slightly out braking, out accelerating...spooling up quicker in reaching top end speed.
Car B - uses near every RM (rotating mass) reduction trick, is able to add weight in locations to aid handling as needed, those RM reductions will result in cooler motor operations if geared the same as car A during a race, however may even be able to gear 1-2 teeth higher on a pinion due to the RM reduction
i myself do no RM reductions. i have a friend who started doing them in a 17.5 dirt oval class we race with offroad buggies converted to run late model wedge bodies against purposely designed for oval type only cars. before he did all the below we were usually neck and neck near equal. after he did all the below, he was leaving me, competing with and beating those oval only cars. accusations of cheating were abound, then he had to go thru many question and answer sessions of what he had done to his converted offroad buggy.
- ceramic bearings in GB, outdrives, motor
- slipper eliminator and LW top shaft, exotech spur mounted with TI screws instead of steel
- ceramic diff balls inner and outer
- cut gears
- full LW aluminum MIP puck and diff system system
- aluminum diff halves are drilled to lighten further
- titanium outdrives and uses LW aluminum wheel nuts
when i spoke to RCA when i got my XB2 from them about a spur gear lower than 75T, they did not think of it and 17.5 racing in the US at the time.
to do up a XB2 for this extreme RM reduction for 17.5 racing you will need to use other brands ball diffs that will support a 53T XB2 diff gear. see wiki on this car. IMO, i would just go ahead do another car brand for 17.5, but either way you will spend alot of money. RM reduction in not cheap. there was a post with a photo of a XB2 with a TLR LW ball diff, aluminum bones, outdrives, and rear hub carriers, but i can't find it. talking to a racer, who had pucked and RM reduced this car, he said MIP/AE type diffs will work too, shim as needed.
Last edited by fast-ho-cars; 02-10-2017 at 12:13 PM.
02-10-2017, 12:45 PM
#4584
Quick question on a write up in the wiki. It says for the ball diff To put a drop of ca glue between the ring and outdrives and use a shim cause the stock spring is too short. If I use the AE spring do I still need to glue the rings to the outdrives? Or do I not need to do that or use the shim if using the AE spring?
Last edited by Slapjack; 02-10-2017 at 05:06 PM.
02-10-2017, 06:30 PM
#4585
Spend your time and money on practice. Don't get caught up in doing all the mods.
02-10-2017, 06:32 PM
#4586
Quick question on a write up in the wiki. It says for the ball diff To put a drop of ca glue between the ring and outdrives and use a shim cause the stock spring is too short. If I use the AE spring do I still need to glue the rings to the outdrives? Or do I not need to do that or use the shim if using the AE spring?
02-10-2017, 08:11 PM
#4587
I'm just concerned about how tight to go. What he did was tighten it so you can't turn the tires in opp direction with moderate hand force. Then he broke it in. But seemed like at the end you can rotate the tires pretty easily. I'll probably have to ask someone at my track to help cause trying to explain this on a forum probably isn't going to be easy. Sorry. I just don't want to ruin a $75 diff right off the bat as soon as I get it. This is the video there is a part 3 & 4 but it's a really old video so I didn't know if there is some other way to be doing this
https://m.youtube.com/watch?v=hKpW9nqOok4
https://m.youtube.com/watch?v=_XZCphE3Ics
02-10-2017, 10:21 PM
#4588
xray instructions for setting up the diff is pretty much the standard everywhere
on my stock XB2 ball diff i put a little CA where diff rings go unto diff outdrive halves. i did have issues with one side diff rings spinning.
not sure if this is needed on MIP diffs, or other brands that will fit in XB2. i have another brand car and diff rings are also not keyed and they do not spin or require CA
on my stock XB2 ball diff i put a little CA where diff rings go unto diff outdrive halves. i did have issues with one side diff rings spinning.
not sure if this is needed on MIP diffs, or other brands that will fit in XB2. i have another brand car and diff rings are also not keyed and they do not spin or require CA
02-10-2017, 10:42 PM
#4589
xray instructions for setting up the diff is pretty much the standard everywhere
on my stock XB2 ball diff i put a little CA where diff rings go unto diff outdrive halves. i did have issues with one side diff rings spinning.
not sure if this is needed on MIP diffs, or other brands that will fit in XB2. i have another brand car and diff rings are also not keyed and they do not spin or require CA
on my stock XB2 ball diff i put a little CA where diff rings go unto diff outdrive halves. i did have issues with one side diff rings spinning.
not sure if this is needed on MIP diffs, or other brands that will fit in XB2. i have another brand car and diff rings are also not keyed and they do not spin or require CA