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  1. #1
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    suspension compression/ rebound

    I am building my Rally for on road only, I am running the factory Summit shocks with factory oil (30 weight I think) I replaced the red springs with white springs with green marks in front and white with sliver marks in back. My question is when you compress the suspension it is slow moving on compression and rebound. When the front is fully compressed it takes about 2-3 seconds to return to normal is this too slow for a on road set up? What should normal rebound times be for the shocks? Thanks Dave

  2. #2
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    No, that doesn't sound right at all... It should be pretty instantaneous. Check your oil weight, or make sure your suspension components aren't binding somewhere.

  3. #3
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    Looks like the green springs are just to weak. Going to grab a few heavier rated springs.

  4. #4
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    For sure, that could be very well it as well....

  5. #5
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    Quote Originally Posted by ViperZ View Post
    For sure, that could be very well it as well....
    Not a binding of suspension or anything as the rally still hasn't made it outside yet When I lift the buggy off the ground and work the suspension the speed on rebound /compression is fine it just does poorly under it's own weight which is just weak springs. Bought a set of 1.4 pink hopefully they will do the trick and won't have to put a lot of preload on them.

  6. #6
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    Let us know how it goes

    Based on the Traxxas Spring rates below, you should be good then.

    Front
    • Spring, shock, white (GTR long) (0.623 rate orange) (7440)
    • Spring, shock, white (GTR long) (0.653 rate green) (7441)
    • Spring, shock, white (GTR long) (0.810 rate pink) (7445)
    • Spring, shock, white (GTR long) (0.892 rate blue) (7448)


    Rear
    • Spring, shock, white (GTR xx-long) (0.711 rate orange) (7442)
    • Spring, shock, white (GTR xx-long) (0.762 rate green) (7443)
    • Spring, shock, white (GTR xx-long) (0.884 rate pink) (7447)
    • Spring, shock, white (GTR xx-long) (1.004 rate blue) (7449)

  7. #7
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    I'm using the JATO style springs like on the Xo-1, I have a shorter front shock tower in the rear also, this way shock are more horizontal for handling.
    Here:
    TRA5427 Jato Springs 0.7 Yellow
    TRA5428 Jato Springs 0.9 Orange
    TRA5429 Jato Springs 1.0 Tan
    TRA5430 Jato Springs 1.1 Green
    TRA5431 Jato Springs 1.2 Silver
    TRA5432 Jato Springs 1.3 Gold
    TRA5433 Jato Springs 1.4 Pink
    TRA5434 Jato Springs 1.6 Blue
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  8. #8
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    You should be good to go...

    I'm using the Red Yellow and Red Whites in my Rally-1 and Red Green in the XO-1

  9. #9
    RC Turnbuckle Jr. humayrayakongkinaon's Avatar
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    Summit shock oil are heavier to compensate heavier spring the stock uses. I dont have a number to tell on my shock oil I uses cause I mixed them vary from 50K down to 2K and I judge the bottles by tilting it of which one is thinner or thicker. You might look into revo springs as well.

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  10. #10
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    Quote Originally Posted by humayrayakongkinaon View Post
    Summit shock oil are heavier to compensate heavier spring the stock uses. I dont have a number to tell on my shock oil I uses cause I mixed them vary from 50K down to 2K and I judge the bottles by tilting it of which one is thinner or thicker. You might look into revo springs as well.

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    I have been checking around the problem is with the Revo springs the rates start 2.9n/mm which is 16.5 in/lbs which are to stiff. You can use red summit springs with yellow bands if you mount shocks perpendicular. But when you switch to more horizontal the Fulcrum angle changes which makes a huge difference on the spring rate.

  11. #11
    RC Turnbuckle Jr. humayrayakongkinaon's Avatar
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    I have 1/8 system on mine with addition of XO-1 splitters/diffusers and 4s lipo so I use revo/Summit springs. Check out slayer springs too.

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  12. #12
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    Quote Originally Posted by Bulldogger View Post
    I have been checking around the problem is with the Revo springs the rates start 2.9n/mm which is 16.5 in/lbs which are to stiff. You can use red summit springs with yellow bands if you mount shocks perpendicular. But when you switch to more horizontal the Fulcrum angle changes which makes a huge difference on the spring rate.
    I wanted to use the Revo springs to stiffen up the chassis for on road use... I guess we'll soon see if it works or not

  13. #13
    RC Turnbuckle Jr. humayrayakongkinaon's Avatar
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    Quote Originally Posted by ViperZ View Post
    I wanted to use the Revo springs to stiffen up the chassis for on road use... I guess we'll soon see if it works or not
    I use blue front and silver rear, stiff? yes, bouncy no, maybe on slow driving with unbalance tires but when its running high speed it stick on the ground as long as the body design aerodynamically. only thing mine did a blow over cause of the steel plate in the middle of the road causing it to lift the front and off it goes
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  14. #14
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    Seems like it should work....

  15. #15
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    Found another weird issue if the bottom of the shock body is too tight is causes the rubber o rings to crush in and slow the speed of the shock for rebound/compression

  16. #16
    RC Turnbuckle Jr. humayrayakongkinaon's Avatar
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    Quote Originally Posted by Bulldogger View Post
    Found another weird issue if the bottom of the shock body is too tight is causes the rubber o rings to crush in and slow the speed of the shock for rebound/compression
    take out the blue rubber damper.
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  17. #17
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    Quote Originally Posted by humayrayakongkinaon View Post
    take out the blue rubber damper.
    will that cause them to leak then?

  18. #18
    RC Turnbuckle Jr. humayrayakongkinaon's Avatar
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    [QUOTE=Bulldogger;5696049]will that cause them to leak then?[/QUOTE ]
    No, their is another o-ring just at the bottom part of the shock body. Just to be clear, the blue damper I'm talking about are the ones on the shafts.

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    Last edited by humayrayakongkinaon; 04-16-2014 at 05:17 PM.
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  19. #19
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    I think he is saying that tightening the bottom cap is causing the shaft seal to drag on the shaft due to deformation of the seal. How does tightening the lower cap affect the inner bump stop on the shaft?

  20. #20
    RC Turnbuckle Jr. humayrayakongkinaon's Avatar
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    No, the bottom cap does not cause any drag affect.

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  21. #21
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    That's what I would think, but his comment makes it seem like that's an issue

  22. #22
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    Quote Originally Posted by humayrayakongkinaon View Post
    No, the bottom cap does not cause any drag affect.

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    Actually it does, when you tighten the bottom cap it puts a lot of drag on the shaft and will slow the rebound and compression a lot, loosening it dramatically effects the speed.

  23. #23
    RC Turnbuckle Jr. humayrayakongkinaon's Avatar
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    Quote Originally Posted by Bulldogger View Post
    Actually it does, when you tighten the bottom cap it puts a lot of drag on the shaft and will slow the rebound and compression a lot, loosening it dramatically effects the speed.
    Something is not quite right with yours, I even use the suplied tool tightened mine.

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  24. #24
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    I don't know all four shocks are the same way. 5 weight shock oil and they feel almost the same as with the 30 weight. Might also need to get the three hole disc vs the two hole that came inside the shock.

  25. #25
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    Drill some holes and let us know how it works out!

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