SRX8

It's  Xray front suspension arm. It is bended little. I try to change Mugen. Mugen arm Size and shape is complete same as Durango. But on full bottom,down stop screw mount hits to drive cup. Then I shaved it by dremel. M2C chassis has two screw holes under the drive universal. Original chassis has no holes at the area. Why is there holes? Probably these are for mounting weights. Where is weight? I replaced fuel tube. For endurance race I want to avoid fuel tube from thermal of exhaust pipe. Shock o rings are replaced new one. O ring should be replaced every two times running day long. And should rub oring grease on the mouth of shaft before insert oring. It's for don't leaking oil. I changed piston from 1.5x5 to 1.3x8 for low grip surface. I use same oil 42.5 wt before but it effects softer. It's new Kyosho boots. It becomes straight type. I add connection switch for trance ponter. We have to change pon...

I went to track yeaterday. There ware many bump after hard rain. And surface was dry and dusty. Nowadays bump issues is only GP buggy category. EP experts hasn't bumpy track experience. First my car fall down at the big bump.  Another expert's car didn't fall down. I changed setup. I will introduce my setup method. 1 diff setup Every buggies has each character for diff setup. I tried several diff setups. DNX8 needs rear diff softer oil. DNX8 has long rear lower suspension arm then rear tire move slowly. It makes traction long time at out corner. Softer rear diff oil lose rear traction. On power at out of corner these are balanced. If your car rear push out on the out of corner,it caused rear tire touch the ground long time. And slippy surface need more soft oil. High grip surface need hard oil. I find best feel F7k,C5k,R3k. Air temperature is at 28°C. If There are big bump center need soft oil. 2 rear geometrie...

I changed front xb8 shock spring saucer. Xray progressive spring diameter is little larger than Kyosho. Right side is Xray. In summer season traction become weaker and weaker for drying weather. I change soft spring for summer season. I check oil thickness. I fall down from 20 cm above the ground. If chassis hit the ground,I change harder oil. Now spring is Kyosho orange. Oil is change by temperature and spring. https://youtu.be/AQ-y9_70osQ Ready for next run!

On June our track will be held 3 hour endurance race. One team has three mates. Driver rotate with two tank run. Then I want to improve more durability. First I change wing mount holder mounting. I changed the place back hole. And I cut the carbon plate for that. Steering screw loosen twice that black head for right side only. I missed lock nut selecting. It has to select low height nut. Front right drive shaft is vented again. That's cause the issue too. Steering servo mount screw loosen. Provably new KO sarvo has more trque. I add one post with long screw on buttery box rear end. Chassis is shaved at rearend. It has 2 mm or 1.5 mm. The I order M2C to AMain. RC tech mate use the chassis. It makes rear traction be strong. I am interested in end guard. Is is flat under the chassis ? I don't like chassis guard popping up under the chassis. If flat type was, I like this. The guard plate made by steel. Then it incre...

Yesterday I went to track. I put off rear mad guard then a little screw jump into between drive cup and under suspension arm. I can't find it on the track. I will have to put on mud guard. I try thick diff setting 10k,10k,5k. It's not bad. But I used Kyosho center diff then it effects more thick compared with front diff. It makes push under. I will try 10k,8k,5k next run.

On 04/30 truck condition is bad. Surface is dusty.Grip is bad.And last heavy rain make big gap. In that case I changed spring to softer and longer. Front spring is Xray 3 stripes rear.Rear spring Kyosho Orange M size. If I had 1.3 mm x 8 holes piston,I change the piston. I like thick oil. I adjust piston side. Thick oil is difficult to leak. And never change character on long distance drive. Ride height +1 mm for big gap. And carburetor reducer change 6mm diameter from 7mm. I try diff oil ticker 7K,7K,3K. It feels good. I will try 10K,10K,5K on next run.

https://youtu.be/-rwF9hlZiJc I have changed front suspension arm to Xray. After that my dnx8 lost balance  I try some setting two days. I recover to the video. But not yet. Rear truncation is lost. I don't understand that. I researched rear blase holder. The holder was broken. I want to replace aluminum holder.

Today I went to truck for setuping next Sunday race.   First I tune engine. I introduce needle setting method.   ① Main needle After warm up. On the bench trigger throttle max, after while engine sound changing high tone. The sound is coming from Fuel is not much  provided.   If sound not be changing main needle should tune clockwise.   Depends on your truck straight length. You should adjust after how long after while by main needle. You don't continue trigger throttle after sound changing.   If the truck has long straight takes 5 seconds on maximam,main needle should tune unclockwise. Until it takes 5 seconds to change sound.     ②Secoundary needle After max sound changing you shoud operate full braking. Engine rotation will be down changing two steps. Max->High idling->Low idling.   It is coming from secondary needle provide much fuel. Then should tune...

Tomorrow I'll go to truck. Basically our truck is high grip. Last running I have high side on large corner. Then I change ride hight to 25mm. But big air section my car bumped. Then I change low roll center. Before I set d plate be used 0.5down. I change c plate brush 0.5 up. D plate bush center. On front section b plate bush be set one degree up. A plate bush 0.5down. Tight corner response be more quick. On high speed corner the car will be stable. Then I change ride height 26mm. My experience almost car rear suspension should move vertically. It means upper suspension arm should be long. On the corner it makes under stealing. Then I adjust low roll center. It make over stealing. If I was mistake wheel operation I can control rear traction remain by vertically attachment to ground. So RC8B3 rear hub is ! My rear hub modify so.

About Front lower suspension skid angle. I changed front one degree down. It make quick response on tight corner.  MP9 front lower rear side is changed. Rear side hole position is moved upside. It make low roll center and square skid. Long spring make handling mild but square skid response quick. It mean if stealing operation failed you can recover easy. I'll try to change rear bush one degree up. Front bush center.

Yesterday I went to track. First tank I feel be dull rear movement. Then I change rear hub width. I used XRAY +2mm wheel hub. +2mm hub makes low roll center. If changed low roll center, I should change long upper link and camber set near zero. Front end I had changed front lower +1mm washer and +1mm wheel hub. It make handling quick and increase cornering traction. High speed cornering makes high side. Then I adjusted ride hight 25mm. DNX8 reached racing speed. I changed 48T gear.But I didn't place spacer high mount for diff. I broke super gear. Probably Spur touched ground. I replace 46T Kyosho. Engine become powerful more and more. then I could run with 46T now. I compare with original and Kyosho diff 46T. Kyosho diff has thin spur and just size for mounting center diff mount. Then Kyosho make low friction and smooth.  DNX8 is easy to replace center diff. It was windy day . Then I replace rear wing JConcept flat type wing. ...

Yesterday I went to truck. Five mates have came to truck. A expert driver checked my DNX8. He felt too much under steering. He changed steering EPA on the ground.  I set EPA on maximum droop at building the car. Then steering angle is set small. Now I set droop 102mm short. I should set EPA on the ground. I can get more steering angle. After changing EPA the car character is set too quick. And Triton engine is getting more and more high power. Then setting became near normal set up. I can't get racing speed yet. But it became much better. My car can't go forward after break with free throttle. Then I can't connect smooth corner and corner. My experience it caused under spring heavy weight only front. Buggy is necessary for under spring weight to get traction.  But only front heavy weight can't go free rolling. I modified rear end.  Then weight balance is collapsed. I try change front under ball to Mugen as same as upper....

I'll go to our truck today. I change set up for quick handling. Diff oil are set 5,7,4K. Active caster is set 2 down. And front under bush are set row roll center. Rear wheel base is set +2mm. Camber link is set most short. Droope is 101,122. Ride height is 25,26. I'll try many variations for race pace. If l found good setup I upload set up sheet tonight.

I search 48t spur gear. Does Durango have option spur?

9 Front kick up I want to get much weight transfer. DNX8 chassis have little front kick up. It si adjusted by lower suspension holder bushes. I'll try FF 2 up and FR 0 up. Pro drivers set front roll center upper side is high hole and lower bush is center. 10 Rear roll center I think  Rear roll center is adjusted with suspension holder bush and inside camber link position. I modified rear hub carrier for adjustable roll center. And hub width is adjustable. Pro drivers set upper link inside lower. Bushes are selected center. I think rear roll center setting is most important for drive feeling. We can understand easily roll center. We set suspension arm vertical. At the time row ride height is low roll center. We can adjusted sliding start position. We can feel row roll center quick steering. If I had plenty time I want to change step by step confirming effect.

I set up my DNX8 from Durango tech tip card and pro driver setup sheets. I recommend you to read previous article. 5 Active caster It's active caster setup method. Travis sometimes change active caster. Others select up or down case by case. Probably this is effective setup point. I want sharpens steering. Then I'll try set from down 3. 6 Rear camber link Any driver select high hole. Almost short selected. Short camber is good for tight truck. My DNX8 has XB9's hub carrier. I'll try mid high mount. 7 Ride height This is ride height setting method. 27mm height is basic. On flat surface truck 26mm. Carlos sometimes sets front -2mm lower than rear. I'll try same.  To be continued.

I searched setting sheet on Durango web site. Then I found tech tip card. I have knowledge about what change what effect. But every buggy has each most effective setting point. I don't know where is it yet. Then I should search most effective setting. Probably the card ordered more effective point. My experience most important setting point is diff oil for almost cars. I pick up US driver Travis and EU driver Carlos @ NEOX setup sheet on winter season. 1 Diff oil This is HUDY diff oil setting guide. Travis sets F 5000 C7000 R5000 Carlos sets F7000 C5000 R3000 I set same as Carlos. I feel on power under and too much rear traction. Almost cars doesn't have rear traction. DNX8 chassis have two peaces structure. Then DNX8 has much rear traction. We can use hard oil for rear.  It is nice for forwarding power. I'll try F5000 C7000 R4000. Hard oil for center help easy control after jump control. 2 Droop Travis sets F103.5 R1...