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trashyrich's Avatar
"Experienced user"
trashyrich - 12.27.12, 6:05 pm Post #1: | Reply With Quote
My local track changed their layout. It now has a pretty fast straight away with a series of three jumps that are all double if you have the speed. I was pretty happy with my two 2wd trucks as they were able to hit the section with rhythm(sp) and clear all of the jumps.

Problem is now I have 2 trucks with all 4 rear shock shafts bent. Not badly bent, but you can tell. I bought stock replacements.

I have been doing the Jang thing of Losi blue springs and 45 wt oil. I was wondering if I need to step it up to 50 wt oil.

What will keep this from happening in the future. Heavier oil or heavier springs.

BTW they are the stock xxl rear shocks. I was planing on getting some nicer shocks, but not this soon.

Thanks in advance for any advice.
Rich
(Last edited by trashyrich : 12.27.12 at 6:23 pm) Reason: wrong word
It is nice to be important, but it is more important to be nice.
RichBee's Avatar
"Experienced user"
RichBee - 12.27.12, 6:25 pm Post #2: | Reply With Quote
trashyrich said
My local track changed their layout. It now has a pretty fast straight away with a series of three jumps that are all double if you have the speed. I was pretty happy with my two 2wd trucks as they were able to hit the section with rhythm(sp) and clear all of the jumps.

Problem is now I have 2 trucks with all 4 rear shock shafts bent. Not badly bent, but you can tell. I bought stock replacements.

I have been doing the Jang thing of Losi blue springs and 45 wt oil. I was wondering if I need to step it up to 50 wt oil.

What will keep this from happening in the future. Heavier oil or heavier springs.

BTW they are the stock xxl rear shocks. I was planing on getting some nicer shocks, but not this soon.

Thanks in advance for any advice.
Rich
Change to the hardened shock shafts rather than the standard ones. I've had to do this too.

Part number is 2656T Hope this helps.

Track i use is 1/8 buggy and has some big doubles. Haven't bent them since.
(Last edited by RichBee : 12.27.12 at 6:31 pm)
guys2nv's Avatar
"Just Chillen!"
guys2nv - 12.27.12, 6:31 pm Post #3: | Reply With Quote
I bent stock ones to on a tree branch.

Traxxas 2656T (XX-Long) are the rears

Traxxas 1664T (Long) are the fronts.
| Serpent 811T-E | Tamiya TRF 801XT-E |
| Hyper 9e | Slash 4x4 STRC LCG |
| Stampede 4x4 | Stampede | Blitz |
| Futaba 4PLS Controls 'em All |

deerhurst's Avatar
"Dragon"
deerhurst - 12.27.12, 6:31 pm Post #4: | Reply With Quote
ive run into a similar issue. i believe it has to do with the oil. you might try a lighter oil. i believe that on hard fast hits the thicker oils dont allow the shaft to move rapidly enough causing the shaft the buckle. the applied force has to go somewhere. TiNi shafts wouldnt hurt either.
Tamiya DF03ra Lancia Delta | E-Revo | F350 SCX10
Current project: Carbon Fiber Vantage based E-Slayer
Here, dragon-dragon-dragon!
RichBee's Avatar
"Experienced user"
RichBee - 12.27.12, 6:40 pm Post #5: | Reply With Quote
deerhurst said
ive run into a similar issue. i believe it has to do with the oil. you might try a lighter oil. i believe that on hard fast hits the thicker oils dont allow the shaft to move rapidly enough causing the shaft the buckle. the applied force has to go somewhere. TiNi shafts wouldnt hurt either.

Trouble with a lighter oil and big jumps it then bottoms out. TiNi shafts on the rear fixed the issue. Fronts are still ok with the standard ones so far.
deerhurst's Avatar
"Dragon"
deerhurst - 12.27.12, 7:11 pm Post #6: | Reply With Quote
you want some bottom out. distributes the forces over a a larger area. its kinds like jumping and landing on your finger tips or on flat hands. one is more likely to break.
Tamiya DF03ra Lancia Delta | E-Revo | F350 SCX10
Current project: Carbon Fiber Vantage based E-Slayer
Here, dragon-dragon-dragon!
trashyrich's Avatar
"Experienced user"
trashyrich - 12.27.12, 7:13 pm Post #7: | Reply With Quote
Thanks guys.

What about the damper/ pistons. Stockers are 2 hole. I also have 1 and 3 hole.

I dont mind bending another pair of the stock shafts, but I would like to find the root of this problem.

I searched the site and couldnt find anything. Are you guys able to?

Again, thanks.
Rich
It is nice to be important, but it is more important to be nice.
Dr. Isotope's Avatar
"Forum Dwelling Basher"
Dr. Isotope - 12.27.12, 7:19 pm Post #8: | Reply With Quote
You can always dial in some more droop, and build the shocks for more pack. Move the shocks to the innermost hole on the a-arm. You will likely have to go up 1-2 rates in spring to make up for the loss in leverage, but you will gain travel, which will stop the rear end from slamming down as easily. In the shocks, use 1-hole pistons, and start with 25 or 30 weight oil. As the shock compresses rapidly, the fluid cannot pass through the piston fast enough, so it "packs up" above the piston, slowing the rate of compression during the last half of the stroke. I build most of my trucks to utilize small/few piston holes and lightwweight oil, combined with a decent amount of droop.
There are no atheists in the foxholes / There is no intellect in the air / There are no scientists on the way down / Just a working example of faith versus physics. --El-P, Flyentology
trashyrich's Avatar
"Experienced user"
trashyrich - 12.27.12, 7:36 pm Post #9: | Reply With Quote
Thanks Dr. I. Heading to the work bench to see if I can do all that.
It is nice to be important, but it is more important to be nice.
"Experienced user"
bigdodge44150 - 12.27.12, 7:51 pm Post #10: | Reply With Quote
Dr. Isotope said
You can always dial in some more droop, and build the shocks for more pack. Move the shocks to the innermost hole on the a-arm. You will likely have to go up 1-2 rates in spring to make up for the loss in leverage, but you will gain travel, which will stop the rear end from slamming down as easily. In the shocks, use 1-hole pistons, and start with 25 or 30 weight oil. As the shock compresses rapidly, the fluid cannot pass through the piston fast enough, so it "packs up" above the piston, slowing the rate of compression during the last half of the stroke. I build most of my trucks to utilize small/few piston holes and lightwweight oil, combined with a decent amount of droop.
I do the exact opposite to achive the same effect heavier oil with 3 hole pistons inner holes heavier springs. I like to believe the heavier oil will stay in my wore out shocks longer. LOL
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