Check the option parts that ETS A-finalist Marco Kaufmann from Germany has been using at his XRAY T4. Marco explains also the benefit of each part, for which track conditions they should be used and what performance improvement you will experience.
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#301063 T4'21 Graphite Upper Deck 1.6mm
>>> The thinner upper deck makes the car softer which increase the grip of the car. It's an option for outdoor tracks.
#308039 SLP Alu Progressive Shock System - Set
>>> I use the progressive shocks always in the outdoor season. The inserts make the dampening softer in the first part of movement and becomes harder when the car is moving more. The overall grip will increase and the car have more traction.
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#302813 T4 Anti-Roll Bar Front for Ball-Bearings 1.3mm
>>> The 1.3mm anti-roll bar is also a basic on my outdoor setup. Softer anti-roll bar gives your car more steering in the middle of the corner. With Anti-roll bars you can precisely tune the handling of the car.
#308276 XRAY 4S Spring-Set C=2.7
>>> I use the 2.7 spring often in the rear of my car. It makes the rear more stable in fast corners which is helpful at low traction tracks.
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#305880 Composite Offset Spur Gear 110T / 64
>>> With the 64dp spur gears I can adjust perfectly to the gear ratio limit, which is very important in the Stock class. But also for Modified it's great to fine tune my gear ratio.
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#305351 Alu Wheel Hub - Offset "-0.75mm"
>>> With this offset I can make my car smaller, which improve the steering response a lot. It's a great option for both indoor and outdoor.
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#306195 Alu Fully Adj. Battery Holder + Weight for Shorty Batteries
>>> I use a shorty battery always for carpet racing, because the tracks are smaller and the runtime is no problem. With a shorty battery the center of gravity gets lower and the weight is more in the middle of the car. The result is more rotation in small corners.
