I have been able to do a lot of testing with the 4x since I bought the car . I run mostly on high bite carpet in 17.5 tc blinky . I see some of you all that are having a little trouble with setting up the 4x or not knowing where you need to make the adjustments needed for making the car do what you want. I hope this little write up will be able to help most of you out and of course I'm not a pro level driver by any means .. so lets get started
first thing I like to do when getting to my local track or a new track is to see wether the track is smooth or bumpy so I can set my ride height accordingly
- bumpy track I like 5.5mm - 6.0mm
- smooth track I like to start at 5.0mm -5.5mm
first off you need to determen wether you are running on a low traction or high traction track for setting your lower a-arm RC (roll center) height
- low traction I will set the arm with the mid-low setting
- high taction I will set the arm with the mid-high setting
- lower arm position will increase overall traction
- higher arm position will decrease overall traction
wheelbase
- shorter wheel base makes the car more aggresive
so more weight over the front will make the car easier to drive ( lengthen rear or shorten front arms)
more weight over the rear of the car makes the car looser mid corner ( shorten rear or lengthen front arms)
track width
- widening the rear more than the front will make the car more stable
- widening the front more than the rear makes the car stable entering corners but it will also produce more mid to exit steering
camber
- the more negative camber you run the more traction you generate to a point , when the car begins to slide it will break free ( get loose) quicker with more camber
- less negative camber you run may have less overall traction, but will more than likely be better and more consistent throughout the run
- good starting point for me was 1.5 both front and rear camber
droop or up-travel
- less front droop will make the car roll less and transfers less weight to the rear of the car ( better for smooth tracks)
- more front droop will transfer more weight rearward (better for bumpy tracks)
- less rear droop will make the car roll less and transfers less weight forward off power ( better for smooth tracks)
- more rear droop will transfer more weight forward (better for bumpy tracks
rear diff oil
- thinner oil will produce less rotation (off power) makes the car tighter overall
- thicker oil will produce more rotation ( off power) make the car looser overall
upper arm roll center
- raising the roll center means lowering the inner link
- raising the RC will cause the car to slide more and have a little less traction
- lowering the RC ( raising the link) will cause the car to roll around a bit more and will have more overall traction and make the car easier to drive
- short upper arm lengths: makes the car more aggressive ( twitchy) but will produce less mid and exit corner traction ( makes the car transition faster from side to side)
- long upper arm lengths: makes the car calmer ( lazy) and a little easier to drive with more overall traction , makes the car transition slower from side to side
ackermann
- adding shims or moving the link forward on knuckles will give less Ackermann , which causes the outside wheel to turn in harder ( this will make the car more aggressive with more steering)
- removing shims or moving the links back will give more Ackermann , which makes the outside wheel turn less ( this will make the car easier to drive with less overall steering
rear toe
- more rear toe makes the car more stable with more traction but less high speed steering
- less rear toe makes the car less stable with less traction but has more high speed steering
ARS rear toe (Active Rear Steering )
- adding shims to the knuckle will increase rear toe in mid to exit cornering ( more traction through the corner)
- removing shims on knuckle ( making link flatter) will have less traction mid to exit cornering ( less overall traction through the corner
front caster
- less caster makes the car more aggressive entering a corner but will under steer on exit
- more caster make the car easier to drive and will give the car more exit steering
rear caster
- all shims forward is stock kit setting
- moving the rear upper arm forward will let the rear of the car rotate more mid corner
roll damper oil
- thinker oil with fewer piston holes will produce a more dampening effect making the car feel slower to react to weight transfer (better for high bite traction conditions)
- thinner oil with more piston holes will make the car transfer weight faster and create more chassis roll ( better for lower bite traction conditions)
roll damper springs
rear
- harder roll springs will transfer less weight forward entering a corner , it will be more stable going in but will have less traction on exit
- softer springs will make it more aggressive entering a corner and it will generate more traction on exit
front
- harder springs in the front will make the car aggressive entering a corner but it will wash out mid to exit because it will generate less traction
- softer front roll springs will make the car less aggressive ( easier to drive in) entering a corner and will have more mid to exit traction
heave damper oil (same as roll damper)
heave damper springs
rear
- harder springs generate less overall grip b(better to lower bite tracks)
- softer springs will generate more overall grip and let the chassis roll more to a certain point (better for high bite tracks
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