38LikesTekno ET48 Thread
05-20-2019 | 09:35 AM
#5492
Suspended
iTrader: (22)
Joined: May 2015
Posts: 929
Blown Diffs Question - ET48.3
Hi Guys -
I posted this up as part of another post in the EB48.4 thread, but figured I might want to post here as well given it's specific to the truggy....
*I have x2 of these... and both blew a diff* - One truck blew a rear diff, the other a front diff. At least... that's what I'm assuming it is right now. I haven't torn them apart, but one was RWD only, and the other FWD only. the center drive is spinning to both ends - but the outdrives aren't.
A lot of people were puzzled by this at the track as they haven't seen a Tekno do that before. I'm confused as to what I did wrong on these? When I got the kit I had to contact Tekno because the spider gears were not moving freely on the cross pins what-so-ever. At first, Tekno denied that could even happen, but after sending them a video they sent me replacement spider gears and cross pins for both trucks. I confirmed the replacements spun freely and installed them, but yet this? Did I shim incorrectly? Is there something else I'm doing wrong?
I plan to tear them apart tomorrow. I'll update what I find but sheesh... I've never had x2 blown diffs on x2 cars in the same day! I've been building these things since my first Futaba FX-10 - not to say I didn't do something wrong, but unlikely IMO. Any ideas?
PS - I'll check when I get home to see if a set screw may have backed out. I should have spun the tires on both of the vehicles to see if the diffs were good before I rushed to ordering parts. Oh well - I'll have extra's if it's not the diffs
. Thank you in advance for your responses guys!
I posted this up as part of another post in the EB48.4 thread, but figured I might want to post here as well given it's specific to the truggy....
*I have x2 of these... and both blew a diff* - One truck blew a rear diff, the other a front diff. At least... that's what I'm assuming it is right now. I haven't torn them apart, but one was RWD only, and the other FWD only. the center drive is spinning to both ends - but the outdrives aren't.
A lot of people were puzzled by this at the track as they haven't seen a Tekno do that before. I'm confused as to what I did wrong on these? When I got the kit I had to contact Tekno because the spider gears were not moving freely on the cross pins what-so-ever. At first, Tekno denied that could even happen, but after sending them a video they sent me replacement spider gears and cross pins for both trucks. I confirmed the replacements spun freely and installed them, but yet this? Did I shim incorrectly? Is there something else I'm doing wrong?
I plan to tear them apart tomorrow. I'll update what I find but sheesh... I've never had x2 blown diffs on x2 cars in the same day! I've been building these things since my first Futaba FX-10 - not to say I didn't do something wrong, but unlikely IMO. Any ideas?
PS - I'll check when I get home to see if a set screw may have backed out. I should have spun the tires on both of the vehicles to see if the diffs were good before I rushed to ordering parts. Oh well - I'll have extra's if it's not the diffs
. Thank you in advance for your responses guys!
Last edited by ExRCRacer; 05-20-2019 at 09:54 AM.
05-21-2019 | 07:20 AM
#5493
Suspended
iTrader: (22)
Joined: May 2015
Posts: 929
My Own Stupid Fault
Set screws on every single outdrive on every single one of my vehicles was backed out, or in the progress of backing out. It does not appear I used enough loctite, or none at all. Stupid mistake, but a quick fix!
05-21-2019 | 11:32 AM
#5494
On a fresh kit it's best to motor spray the metal parts you intend to put thread lock on. This will clean off any residual oils leftover from the machining process.
06-02-2019 | 08:00 PM
#5495
Tech Rookie
Joined: Mar 2014
Posts: 4
Hi Guys -
I posted this up as part of another post in the EB48.4 thread, but figured I might want to post here as well given it's specific to the truggy....
*I have x2 of these... and both blew a diff* - One truck blew a rear diff, the other a front diff. At least... that's what I'm assuming it is right now. I haven't torn them apart, but one was RWD only, and the other FWD only. the center drive is spinning to both ends - but the outdrives aren't.
A lot of people were puzzled by this at the track as they haven't seen a Tekno do that before. I'm confused as to what I did wrong on these? When I got the kit I had to contact Tekno because the spider gears were not moving freely on the cross pins what-so-ever. At first, Tekno denied that could even happen, but after sending them a video they sent me replacement spider gears and cross pins for both trucks. I confirmed the replacements spun freely and installed them, but yet this? Did I shim incorrectly? Is there something else I'm doing wrong?
I plan to tear them apart tomorrow. I'll update what I find but sheesh... I've never had x2 blown diffs on x2 cars in the same day! I've been building these things since my first Futaba FX-10 - not to say I didn't do something wrong, but unlikely IMO. Any ideas?
PS - I'll check when I get home to see if a set screw may have backed out. I should have spun the tires on both of the vehicles to see if the diffs were good before I rushed to ordering parts. Oh well - I'll have extra's if it's not the diffs. Thank you in advance for your responses guys!
I posted this up as part of another post in the EB48.4 thread, but figured I might want to post here as well given it's specific to the truggy....
*I have x2 of these... and both blew a diff* - One truck blew a rear diff, the other a front diff. At least... that's what I'm assuming it is right now. I haven't torn them apart, but one was RWD only, and the other FWD only. the center drive is spinning to both ends - but the outdrives aren't.
A lot of people were puzzled by this at the track as they haven't seen a Tekno do that before. I'm confused as to what I did wrong on these? When I got the kit I had to contact Tekno because the spider gears were not moving freely on the cross pins what-so-ever. At first, Tekno denied that could even happen, but after sending them a video they sent me replacement spider gears and cross pins for both trucks. I confirmed the replacements spun freely and installed them, but yet this? Did I shim incorrectly? Is there something else I'm doing wrong?
I plan to tear them apart tomorrow. I'll update what I find but sheesh... I've never had x2 blown diffs on x2 cars in the same day! I've been building these things since my first Futaba FX-10 - not to say I didn't do something wrong, but unlikely IMO. Any ideas?
PS - I'll check when I get home to see if a set screw may have backed out. I should have spun the tires on both of the vehicles to see if the diffs were good before I rushed to ordering parts. Oh well - I'll have extra's if it's not the diffs
. Thank you in advance for your responses guys!
I also had to add shims in a couple places that we're not in the instructions/kit. I added .25mm shims under the wheel hexes, and in between the front spindles and the spindle carriers. The front a arms had to be sanded to allow the spindle carriers to move freely, and in the rear I sanded some of the spacers to get the rear hubs to fit nicely in the a arms and move freely.
Still overall very happy with the kit, and the result of this extra work is a very tight car.
I'll work on putting in my electronics in tonight, and I still have to see if I can get these 155mm batteries to fit.
06-15-2019 | 04:46 PM
#5497
Tech Adept
Joined: Aug 2016
Posts: 182
How does the M2C6595 chassis compare to the stock ET48.3 chassis?
Is the M2C6835 Mega Brace compatible with the stock chassis or is M2C6905 the only brace that fits?
M2C6835 Mega Brace link:
https://www.m2cracing.com/product.sc?productId=932
Is the M2C6835 Mega Brace compatible with the stock chassis or is M2C6905 the only brace that fits?
M2C6835 Mega Brace link:
https://www.m2cracing.com/product.sc?productId=932
11-13-2019 | 04:28 PM
#5498
What are the differences in these 15 degree spindles?
15 degree Trailing spindle
https://www.amainhobbies.com/tekno-r...94/p450421?r=0
https://www.amainhobbies.com/tekno-r...2b/p273544?r=0
15 degree Trailing spindle
https://www.amainhobbies.com/tekno-r...94/p450421?r=0
https://www.amainhobbies.com/tekno-r...2b/p273544?r=0
11-18-2019 | 04:30 PM
#5500
So what all is needed to install the HRC rear hubs on the ET48.3? I am going to order them and want to make sure I have everything needed to swap them over since we don’t have a local hobby shop any longer.
hubs. TKR5199B
bearings size the same as kit?
stock driveshafts work?
hubs. TKR5199B
bearings size the same as kit?
stock driveshafts work?
Last edited by PorTX; 11-18-2019 at 04:45 PM.
11-24-2019 | 08:26 PM
#5503
Anyone happen to have this issue come up? I have my brake strength down to 40 percent with brake expo of -12 (futaba). Go into the corner at the end of the straight and the truck brakes nice and straight, for the first few feet then it instantly swings the back end around. There is no stopping it or controlling it? It is almost like it is going into reverse all of a sudden. However there is no reverse in the Rx8 setting...it is FWD only. I have let a couple of people drive it that have way more experience than I have and they have no clue what is going on. Most are like...it has no brakes and then about that time it locks one end up and swings the rear end around...without warning. I am stumped.
EDIT....figured it out finally! Decided to compare my settings with my other vehicles. Both on the radio and the ESC. The ESC setting had the ACTIVE BRAKE set to 4 on my truggy and zero on every other vehicle. Changed that and it is all good now!
EDIT....figured it out finally! Decided to compare my settings with my other vehicles. Both on the radio and the ESC. The ESC setting had the ACTIVE BRAKE set to 4 on my truggy and zero on every other vehicle. Changed that and it is all good now!
Last edited by PorTX; 11-25-2019 at 11:49 AM.
12-20-2019 | 07:15 PM
#5504
Swapped over to the emulsion caps. I think who ever designed the o ring for the TKR8207 emulsion caps, should be kicked in the nuts! Those things are a pain to install in the caps. Almost like they are to large for the cap? I would just about get to the point I would give up, and it would just plop down in there like it was suppose to. Took me an hour and half to get the 4 o-rings in the caps!
01-05-2020 | 11:57 AM
#5505
Tech Apprentice
Joined: Oct 2018
Posts: 80
From: WA
Swapped over to the emulsion caps. I think who ever designed the o ring for the TKR8207 emulsion caps, should be kicked in the nuts! Those things are a pain to install in the caps. Almost like they are to large for the cap? I would just about get to the point I would give up, and it would just plop down in there like it was suppose to. Took me an hour and half to get the 4 o-rings in the caps!
Haha oh yea i had the same problem when i built my EB48.4 a while back. I was certain the o-rings were too big...