These 1-hole uprights provide an additional option versus the standard 2-hole upright when the outer hole does not allow enough roll, and the inner hole creates too much roll.

A medium “M” and graphite “G” hardness rear upright is available as an option.ġ-hole uprights were developed as an optional fine-tuning part to compliment the standard 2-hole uprights for high-traction tracks where more roll of the car is desired. The rear uprights are available in three different material formulations that were specifically blended for particular racing conditions. The rear uprights feature small but robust 5x10x4mm ball-bearings to minimize unsprung weight. There are two different roll center positions on the rear uprights, and roll center positions can be easily adjusted by adding shims between the upright and the turnbuckle ball joint. The rear uprights feature 0° toe to ensure stability and prevent suspension geometry changes in hard crashes. Hard 'H' rear uprights are included to improve the stability of the car and to increase cornering speed of the T4. The drive shafts have been additionally hand-ground for maximum precision and to provide true rotation and unbinding drivetrain operation. These specially-lightened drive shafts can only be manufactured from special HUDY Spring Steel™ which was developed for extreme racing conditions. The drive shafts are strategically lightened – see the hollow end of the dog bone – to guarantee the lowest possible weight without compromising strength or durability. With the new ECS drive shafts, wheel vibrations and noise are decreased to minimum, steering is increased, and cornering speed & smoothness are noticeably increased.ĭrive shafts are exclusively manufactured from special world-renowned, top-secret, self-developed HUDY Spring Steel™. Drive through the corner is more stable, more precise, and easier. Regardless of cornering speed and wheel angle, the inner wheel will not bind or vibrate. With a unique 2-piece joint between the axle and the wheel, the same extreme wheel turning angle is divided into two shallower angles without causing binding. The legendary XRAY ECS drive shafts equalize the speed between the drive shaft and the wheel. 50mm and 52mm ECS drive shafts are still optionally available to suit particular track conditions. All-new ECS drive shafts are 51mm long for optimized steering and stability.

Spring 4 new features