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Old 07-13-2010, 02:50 AM   #1
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Default really bumpy/rutted track setup advice needed.

hi guys i was just wondering if i can get some help/advice on some ideas for setting up my xray xb808 '09' for a fairly rutted out and bumpy track with loose stuff on top.

i had some issues with my car coming from a big event on a blue groove smooth track with decent setup to then going bak to this bumpy rutted out track without changing setup and it really was difficult to drive.

i have some ideas like more neg camber and more caster but is there anything else some pro drivers can give me for setup to really handle bumps and rutts?

the neg camber will stop me catching the rutts as i turn but what exactly does the extra caster do to help?

any help much appreciated.

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Old 07-13-2010, 01:43 PM   #2
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things i would try..

lighter diff oil in center

more anti squat/ rear toe

lighter rear springs

stand rear shocks up on rear tower

steel flywheel is xray car has it
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Old 07-13-2010, 02:46 PM   #3
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If your track has small to medium jumps or easy jumps with nice landing ramps try useing large hole pistons and really thick oil.

You'll lose some pack. Thick oil deosn't get turbulent, especially through a large hole.

Addingt rear camber helps.
More caster will make the car easy to drive in the whoops sections, easier to jump, and more turn-in.
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Old 07-13-2010, 03:12 PM   #4
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We have been testing a few things on the '10 Spec buggy that have helped the car handle bumps and ruts tremendously.

Shock Set-Up:

1.3 x 6 Hole Pistons
400cst Shock Oil (Roughly 35wt)
Silver Springs

1.2 x 6 Hole Pistons
350cst Shock Oil (Roughly 32.5wt)
Silver Springs

You might have more luck by dropping down to a Grey Spring in the rear or bumping up to a Grey-Blue Spring in the front if the track is really rutted. You might also want to consider drilling 1.2 pistons out to 1.25 and then running 1.25 pistons on all 4 shocks.

Going up from 10 of Caster to 12 will help stabilize the car as well.

Hope this helps.
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Old 07-13-2010, 03:31 PM   #5
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the quick fix is more caster and camber. your xray has optional wide wheel hexes. good time to use them as well.

you can always go lighter with dampening and center diff if things get really extreme.
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Old 07-13-2010, 10:09 PM   #6
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The biggest things I've tried that have helped are:

- Lighter center diff fluid (3k or even less)
- Lighter rear diff fluid (3k or less)
- Maximum anti-squat
- Maximum front kick-up if it's adjustable
- Lighter shock oil
- Short rear link
- Moving inside rear pivot point down
- Emulsion style shocks if possible (cut out center of shock bladder)
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Old 07-13-2010, 11:51 PM   #7
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all depends on track is rough section is rutted like washboard then use 1.2x6 in back with 27.5 on silver springs and 1.4 on 40 in front on bluegrey springs if track is blown out with holes you need to get tires to skip over instead of digging into causing car to buck all over the place then try 1.4x6 with 45 on bluegrey in front or 47 wht and in back 1.3x6 on 37.5 wht with bluegrey springs seems to slow shocks down so will skip over the blown out stuff keeping your car going where you drive it and will still land big jumps without bottoming out too much
if want to go off the wall try 1.1x10 pistons in back with silver spring and 27.5 oil and 1.2 x 8 hole in front with 32.5 on silver spring
i have found with my car on smooth tracks or rolling ruts like wash board i like the light set up and on blown out tracks i run the stiff setup you will need extra set of shocks to have both setups on hand without having to change pistons at the track willjust have to fine tune with oils.
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