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XRAY XT4 2021


>See the beautiful presentation of the XRAY XT4 here

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All-new Features:
- All-new longer chassis for improved stability
- All-new super-narrow front & rear gear boxes to accommodate new suspension mount positions
- All-new narrow front & rear suspension holders
- All-new front, central & rear gear differentials with increased oil volume to improve consistency
- All-new differential crown gear
- All-new steel crown gear and pinion gear CNC-machined from Hudy Spring Steel with improved lifespan and reduced noise
- New center drive shafts feature 2.5mm drive shaft pins for increased efficiency
- All-new longer front and rear drive shafts
- Updated aluminum motor mount with easier pinion gear access
- All-new center upper graphite brace
- Revised rear graphite shock tower can be mounted from both sides of the gear box
- Reinforced servo saver stands for improved steering precision and a new shape for improved clearance

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Chassis.
The XT4 chassis was lengthened to increase stability, while maintaining the desired the chassis flex for the best balance of traction and steering. The chassis was also narrowed in the front and rear sections to create the clearance necessary for the new suspension holders and narrower geometry.

The chassis cutouts and the motor mount allow the motor to be installed as low as possible in the vehicle to reduce the CG, improving the cornering speed and stability.

CNC-machined from high-quality Swiss 2mm 7075 T6 aluminum, the chassis is strategically machined in low-stress areas to make it as light as possible without affecting strength or rigidity; and it is additionally black-coated for increased lifespan.

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Bulkheads.
The all-new, super-strong, narrow bulkheads provide the needed clearance for the new narrow suspension holders. This additional clearance allows for a wider range of track width adjustments and for moving the inner suspension pivot closer to the vehicle centerline. The new bulkheads have a perfect fit to the all-new front and rear differentials and are reinforced to increase their reliability.

The bulkheads allow super-fast & easy diff exchange and servicing by removing only 4 screws from the front of the bulkhead and bottom of the chassis. This super-fast access is available for both the front & rear diffs. The bulkheads have minimal ball-bearing play, resulting in increased gear tooth lifespan and minimized gear stripping.

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I.S.S.™ Suspension Holders.
All-new narrower suspension holders move the inner pivot location closer to the vehicle center. The narrower design increases rear traction.

The aluminum suspension holders feature Integrated Suspension Settings (I.S.S.™) which allows for quick & easy suspension geometry set-up.

Machined from premium Swiss 7075 T6 aluminum and black coated.

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Center Driveline.
Everything is new on the central driveline – drive shafts, motor mount, center differential, drive gears, bevel gears. Everything is new, lighter and more compact for improved efficiency and reliability.

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Gear Differential.
The new XT4 includes completely redesigned front and rear differentials featuring a split design of the cover and crown gear. The new differential case has greater internal oil volume to increase consistency of the diff action, yet it is significantly narrower to fit into the new narrower bulkheads and to move the rotating weight closer to the centerline.

The super-smooth, low maintenance diff includes a composite case and cover with internal satellite gears that are precision-molded from special XRAY-developed graphite composite material, ensuring a long lifespan and super-smooth, efficient operation.

The new gear differentials feature all-new diff-outdrives designed for use with 2.5mm pin.

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Diff Gears.
The new split design of the gear differential features a separate lightweight crown gear and a separate diff cover. The split design results in significantly lower rotating mass and improves the serviceability.

The crown gear is now CNC-machined from HUDY Spring Steel and is ultra-hardened to improve strength and reliability. The split crown gear allows for a simpler exchange to optional gears without requiring a rebuild of the internal diff assembly.

To improve the gear engagement both crown gear and pinion gear have more teeth and new geometry that results in smoother engagement and increased efficiency.

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Central Differential.
The all-new center gear differential was completely redesigned. The differential case has greater internal oil volume to increase consistency of the diff action, yet it is significantly narrower.

The gear differential features all-new diff-outdrives designed for use with 2.5mm central driveshaft pins.

A center gear differential comes as standard equipment in the XT4 and can be tuned for a wide variety of traction conditions.

The maintenance-free diff design will benefit racers of all levels. Once built, the diff assembly should require minimal maintenance for extended intervals…no need for frequent oil changes.

The super-smooth gear diff includes a composite case and cover with a removable spur gear. The kit includes the 81T spur gear and an 78T spur gear is available as an option.

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Diff Outdrive.
The diff outdrives were redesigned with a smaller design for the new front and rear differentials and the new narrower center differential assembly. The center outdrives now feature the same 2.5mm pins used on the front and rear diffs.

To reduce rotating weight, the super-lightweight diff outdrives are machined from HUDY Spring Steel™ material that allows additional material to be removed from the outer sections of the outdrives, further reducing the weight without harming durability. The inner segment of the outdrive is additionally hand-ground for perfect fitment into the diff case.

The outdrives are hardened using XRAY’s own special hardening process to provide extended lifespan and reliability.

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Drive Shafts.
The front and rear driveshaft lengths are updated to match the new differential width and suspension geometry; the front drive shaft is 99mm long and the rear drive shaft is 94mm long.

The safety collar on the front driveshaft secures the pin and coupler, while the inner ball bearing captures the pin in the rear axles, preventing both assemblies from coming lose during a run.

XT4 constant velocity drive shafts are manufactured from world-renowned HUDY Spring Steel™ and feature 2.5mm drive pins for maximum drivetrain efficiency. The drive shafts are some of the world‘s thinnest yet most durable drive shafts used in electric off-road cars. Hardened with a proprietary hardening process, the drive shafts provide unbeatable lifespan and reliability.

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Motor Mount.
The motor mounting plate features a new shape for easier access to the pinion gear set screw. The inner motor screw is now recessed into the mount for improved clearance around the center spur gear.

The motor is connected to an eccentric mounting plate, with that assembly then inserted into an integrated motor holder/drivetrain support. The design allows quick & easy motor rotation to adjust gear mesh, and still securely holds the motor plate using only a single screw.

To ensure the motor will not loosen in a serious crash or due to insufficient tightening, the motor plate has a bayonet mounting system which prevents it from being dislodged from the motor holder. By rotating the motor mount plate to the opposite direction, the motor can be quickly removed from the vehicle.

Removing the motor or adjusting the gear mesh is easy and fast, with changes possible in only a few seconds.

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Central Bulkhead.
The central assembly features a new upper deck to match new layout of the motor mount and central bulkheads on the chassis plate. The entire assembly is more compact with weight placed as close to the chassis centerline as possible. The new upper deck also fits the optional central differential’s new case design and dimensions.

The graphite central upper deck captures the center diff ball-bearings in the motor mount and bulkhead assembly, and also allows for easy adjustment of the optional slipper clutch.

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Shock Towers.
The rear shock tower has a new design so it can be mounted in front or behind the rear bulkhead. The rearward configuration puts more weight over the rear to generate more rear traction, and is suggested for low traction conditions.

Both front & rear shock towers are machined from premium-grade graphite and are lightweight & strong, with multiple shock positions and roll center adjustment positions.

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Steering System.
The reinforced servo saver stands are now machined from one piece to simplify assembly and to improve steering precision, especially in high traction conditions.

The dual arm steering system is simple yet effective and features an easily adjustable, integrated servo saver. Ackermann is easily adjusted by quickly changing the steering link mounting positions on the steering plate.

Bump steer is adjusted for more aggression by inserting a shim between the steering block and steering linkage.

See the beautiful presentation of the XRAY XT4 here