Even the best car in the pit can still be slow if the setup is wrong. That’s why the free ER set-up sheet for the ER HNR Kit is here!

How to use it

• Just set everything you need – camber, shims, damper positions and ride height.
• Print it or share it – save a one-page PDF, or share your setup on EmbieRacing.com. It stays here for you and for other drivers.

▶ Open the set-up sheet  ·  Browse shared setups →

Keep your electronics clean and fully protected on the track! The brand-new EmbieRacing XV01 Standard Kit Cover is officially live and available for free download.

This cover is custom-designed specifically for the EmbieRacing Tamiya XV01 Standard Carbon Conversion Kit, offering a clean, precise fit without the need for makeshift tape or mesh nets.

Key Features:
• Complete Protection: Fully encloses the electronics bay to seal out dust, mud, and stones.
• Perfect Fit: Engineered to match the geometry of ER carbon fiber chassis.
• Easy Access: Keeps your setup completely protected while maintaining simple access for battery swaps.

Download Now
The 3D printable files are completely free. Download them now on Printables and print your own!

Download the XV01 Standard Kit Cover on Printables.com

After almost a year of testing and refinement, the EmbieRacing kit for HNR H9804 has reached its final form, and I’m really happy with it.

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What’s new

• New shortened aluminium lower chassis: fits standard 256 mm rally bodies and allows straight rear driveshafts. Like the stock chassis, it has a bent front edge that works as a built-in front nose. That’s why it’s aluminium, not carbon.
• No more forward-facing rear suspension arms. The stock layout creates odd forces on the rear axle and makes the car hard to set up. That’s gone.
• Redesigned suspension arms: now symmetric, so left and right are identical (only the steering knuckles differ).
• Rear dampers mounted from the front for better weight distribution.
• Carbon two-piece top deck and carbon shock towers for high stiffness, plus extreme steering angle and several setup improvements.

One kit, no compromises
Until now the parts were sold separately (steering, suspension and so on). Since I now know from experience that everything works together, it’s one product: ER HNR KIT – FULL.

Race proof
At the Czech National RC Rally Championship round in Humpolec, the car handled beautifully and took me to 7th place overall in a highly competitive field. At the latest round in Šumvald, I used the chance to try many other cars. Some were good, some even better, but my HNR with the latest kit was the one I liked most. Of course it was also set up exactly to my liking, but its behaviour was simply the best for me. Feedback from other drivers on my car was very positive too. In my experience the car now performs at the level of the best rally cars on the market, and in some respects it goes beyond them. I’d put this kit next to my XV01 kit and the Ralcon as one of my best products.

Good to know: longer front driveshafts are needed (I recommend YeahRacing XR-T4-027).

What I’d still improve: better dust protection, and a better-placed on/off switch (that one is more my electronics setup than a kit issue).

Last sunday, I raced my (quite heavily! 😀) modified HNR H9804 FoxHound at the Czech National RC Rally Championship event, RC Rally Zálesí in Humpolec. The car handled beautifully, allowing me to take 7th place overall in a highly competitive field.

To share some insight, here is the breakdown of the EmbieRacing (ER) and other custom modifications that made this result possible:

Chassis & Layout

• Lower Chassis:
  • ER PROTOTYPE glass-fibre shortened chassis. This allowed me to straighten the rear driveshafts compared to the original setup, which is too long and features forward-facing rear suspension arms.
• Central Driveshaft:
  • ER PROTOTYPE glass-fibre shortened rear central driveshaft. Originally just a test piece, its performance has been excellent, resulting in significantly less wear on the outdrives.
• Chassis Brace:
  • ER PROTOTYPE 3D-printed rear chassis brace.

Suspension Modification

• Front:
  • Front suspension arms from the ER HNR KIT – UPGRADE SUSPENSION ARMS SET.
• Rear:
  • ER PROTOTYPE 3D-printed rear suspension arms designed to fit the shortened chassis. The dampers are now front-mounted. Fitting them this way was quite a challenge due to limited space—requiring modifications to the original cover and battery holder—but the handling improvement is definitely worth it.
• Anti-Roll Bar:
  • ER PROTOTYPE 3D-printed anti-roll bar holder.

Steering & Drivetrain

• Steering Hardware:
  • ER HNR KIT – STEERING HARDWARE (part of the ER HNR KIT – FULL) with a 16 mm wide steering arm, paired with a 3 mm spacer at the steering knuckles to reduce bump steer.
• Top Deck:
  • Stiffening Top Deck (included in the steering hardware set).
• Driveshafts:
  • YeahRacing (XR-T4-027) driveshafts paired with Xray 3.5 mm plastic drive shaft caps (XR-305241). Using plastic caps drastically reduces outdrive wear.
    • Tip: While you can use 3.0 mm caps, I used what I had at home. This required widening the outdrive slots to 3.5 mm, but the 3.5 mm caps have better availability and last longer.

Dampers & Shocks

• Shock Towers:
  • ER HNR KIT – ADJUSTABLE SHOCK TOWERS.
• Dampers:
  • Xtra Speed Aluminum Big Bore Damper Combo Set (XS-TA29208GD), using 75 mm at the front and 90 mm at the rear.
• Top Damper Joints:
  • Modified using this Printables 3D model ( https://www.printables.com/model/1647996-rc-car-shock-damper-top-joint). Crucial step: Double-check that everything moves smoothly here.
• Inner Shock Spacers: Custom 3D-printed spacers.
  • The original spacer is about 2.4 mm high, which over-compresses the sealing X-rings and causes the piston to bind. I replaced them with 3D-printed versions (marked in red in the picture) lowered to 1.4 mm, making the dampers very smooth.

• Springs:
  • Blue springs on both axles from the Tamiya Big Bore Damper Spring Set (Aeration Type):
    • Front set (4WD): 54506
    • Rear set: 54508
• Oil: 200 cSt front / 350 cSt rear.

Pictures will be added later!

ER HNR KIT – FULL includes:
– ER HNR KIT – STEERING HARDWARE
– ER HNR KIT – STEERING ACCESSORIES
– ER HNR KIT – UPGRADE SUSPENSION ARMS SET
– ER HNR KIT – ADJUSTABLE SHOCK TOWERS
– ER HNR KIT – FRONT BUMPER ANGLER

All included parts described more detailed in separate posts bellow.

https://www.ebay.com/itm/267708514076

Kit to turn your HNR H9804 into a true RC Rally weapon!

• extreme steering angle for maximum cornering performance
• integrated steering angle limiter for easier setup
• high rigidity thanks to a carbon two-piece top deck
• designed with servosaver compatibility

For best performance, I recommend using driveshafts with a higher working angle to handle the increased steering range.

Optional upgrade:

Modified suspension arm set UPGRADE SUSPENSION ARMS SET and STEERING ACCESSORIES, available separately.

– front + rear
– 4x screw 8mm
– 4x M3 nut

Fits most dampers used for RC rally – from original ones up to big bore buggy dampers.

Modified suspension arms set for HNR H9804

• for width ca 195 mm (stock H9804 ca 180 mm width)
• for normal wheelbase ca 256 mm (stock H9804 ca 5 mm longer – not fitting usual RC rally 1:10 bodies)
• modified for higher clearance without cutting
• made full without holes to improve strength + cleaning
• PA12 SLS – despite the „3D printed look“ this part is very durable

Longer driveshafts needed at front (for example YeahRacing XR-T4-027), rear better longer as well, but temporarily can be used with stock ones + ER printed spacer (free to download at prinatbles.com).

All 3D printed parts of EmbieRacing Ralcon for Xray T3 are now available for free download at Printables.com!

→ EmbieRacing Ralcon – all parts on Printables

What you can get from Printables (free download):

This means you can print all plastic parts yourself and build your own RC rally weapon. Carbon parts files are included as well – those are primarily for testing purposes, as printed versions of structural carbon parts will be significantly weaker. For real use, carbon parts need to be CNC machined.

All 3D printed parts – diff cases, covers, steering block extensions, battery holder parts, servo area cover, and more.

What you will still need from me:

– CNC machined carbon parts (lower chassis, top deck, carbon steering arm, shock towers, battery holder carbon parts)

– Timing belts (front + rear)

– Accessories set (screws, nuts, ball bearings for belt tensioner, turnbuckles, shimms)

What you need to source yourself:

– Xray T3 / T3’10 / T3’11 / T3’12 as a donor chassis (or compatible copy – not tested)

Full list of what’s needed is described in the original EmbieRacing Ralcon post under the „INCLUDED” section.

If you want to go the DIY route and just need the carbon and accessory parts from me, feel free to get in touch via the Contact page.

Let’s build your RC rally weapon! 🔧

Recently I’ve been asked what dampers I use for RC rally. I discovered these some time ago under brand Koswork but later realised, that those are sold under multiple brands. I tried to order same looking set but branded Xtra Speed with a bit lower price and received exactly the same thing. Than I realised that also brand EXO Design sells very similar looking set of dampers – these I haven’t tried, but I believe those are the same too.

Recap:

XS-TA29208GD – Xtra Speed Aluminum 75mm & 90mm Big Bore Damper Combo Set For 1/10 RC Buggy

• these I use actively
• cheapest, sometimes unavailable
• best set – contains more parts (upper and lower joints that are not included in bellow mentioned)

KOS04901GD – Koswork Aluminum 12mm Gold F&R Big Bore Buggy Shock Set For 1/10 RC Buggy

• these I’ve had in the same time with above mentioned in hand, it’s the same product
• bit higher price, better availability

EXO-005SGD – EXO Design Universal 12mm Big Bore Shocks Set For 1/10 RC Buggy

• looks same as both above mentioned, never had in ma hand
• seems it contains all the parts that Xtra Speed ones do
• highest price

Springs:

I combine these with spring set from Tamiya:

54506 – Tamiya Big Bore Damper Spring Set – Aeration Type – Front (4WD)

54508 – Tamiya Big Bore Damper Spring Set – Aeration Type – Rear

How to order:

Just place the product number in the search form at rcmart.com – whis way I ordered. Probably you’ll be able to order at different shops.

How they work:

I’ve been racing those for ca 8 rally races now. Till now I havent noticed any oil leak. As everything seems precise and tight fitting, I use for those low oil viscosities 100-200 cst. In general I find those very good dampers.

3D printed top joint

At printables.com by searching „RC CAR SHOCK DAMPER TOP JOINT“ you’ll find Top joint with implemented hex nut for Koswork/ Exo Design/ Xtra Speed that I find best to use with these dampers. Top joint from the package will work for you as well anyway.