Garrett 934174-5004S G-XRace GXR55-88 XBoost Supercore 88mm/149mm 0.25in PS

Vehicle Fitment

• Universal - compatible with professional motorsport and drag racing applications on 3.0L-12.0L engine platforms supporting 1,000-2,350 HP; requires a compatible G-XRace GXR55 or G-Series G55 turbine housing

Fitment Notes

• Supercore only - G-XRace GXR55 or G-Series G55 turbine housing required and sold separately; available in V-Band and T6 inlet configurations in 1.24 A/R and 1.40 A/R
• G-XRace GXR55 turbine housings are interchangeable with G-Series G55 housings, enabling a straightforward upgrade from a G55 supercore
• 0.25" map groove ported shroud compressor housing - wider surge slot than the 0.18" variant, suited for applications where surge margin is prioritized
• 103mm turbine wheel - smaller exducer than the 106mm variant; suited for higher-RPM race applications with compatible turbine housing A/R selection
• Designed for use in LDR (Limited Drag Radial), X275 drag race classes, and any class with an 88mm compressor inducer rule - verify class rules before purchasing
• Speed sensor port machined into compressor housing - compatible with p/n 923586-0003 (G-Smart Bluetooth Module), 781328-0003 (street kit with gauge), or 781328-0004 (pro kit without gauge), all sold separately
• Maximum allowable turbocharger speed: 84 krpm - use above this speed is at owner's risk and may result in damage or premature failure
• Not CARB legal - for competition and off-road race use only; not for sale in California

Features

• XBoost technology delivers +21% compressor flow compared to the G55-1950, with enhanced pressure ratio capability and higher efficiency at high airflow levels
• 88.9mm compressor inducer / 149mm compressor exducer - maximum compressor wheel size in the GXR55-88 lineup for extreme high-horsepower race builds
• 0.25" map groove ported shroud design for superior surge resistance across a broad operating range
• 103mm turbine wheel for high-RPM exhaust energy extraction in large-displacement race engine applications
• Lower intake temperatures via improved compressor efficiency - denser charge air for more power potential
• Lightweight one-piece aluminum backplate reduces supercore weight
• Fully machined flange-style speed sensor port for turbo shaft speed monitoring and overspeed protection
• Compatible with G-Series G55 and G-XRace GXR55 turbine housings - upgrade path from G55 without changing existing exhaust hardware

Specifications

• Part Number: 934174-5004S
• Series: G-XRace GXR55-88
• Horsepower Range: 1,000-2,350 HP
• Compatible Engine Displacement: 3.0L-12.0L
• Compressor Inducer: 88.9mm
• Compressor Exducer: 149mm
• Compressor Trim: 44
• Compressor A/R: 0.88
• Map Groove (Ported Shroud): 0.25"
• Turbine Wheel: 103mm Exducer
• Technology: XBoost (+21% compressor flow vs. G55-1950)
• Center Housing: Lightweight One-Piece Aluminum Backplate
• Speed Sensor Port: Yes - Fully Machined Flange-Style (sensors sold separately)
• Max Turbocharger Speed: 84 krpm
• Compatible Turbine Housings: G-XRace GXR55 / G-Series G55 V-Band and T6 housings
• Sold As: Supercore Only (turbine housing not included)
• Race Classes: LDR (Limited Drag Radial), X275, and 88mm inducer-rule classes

Included Components

• 1x Garrett G-XRace GXR55-88 Supercore - 88.9mm/149mm compressor, 103mm turbine wheel, 0.25" map groove
• Note: Turbine housing, speed sensor, and installation hardware sold separately

Product Description

The Garrett 934174-5004S is the GXR55-88 G-XRace supercore with a 0.25" map groove ported shroud and 103mm turbine wheel - a purpose-built extreme motorsport supercore designed for the highest levels of drag racing competition. Featuring XBoost technology, it delivers +21% compressor flow over the G55-1950, with enhanced pressure ratio capability and improved efficiency at the extreme airflow levels required by 1,000-2,350 HP race builds. The 88.9mm compressor inducer and 149mm exducer represent the maximum compressor wheel configuration in the GXR55-88 lineup.

The 0.25" map groove provides a wider ported shroud slot compared to the 0.18" variant, giving builders additional surge margin at high boost and low mass flow conditions common in radial tire drag racing. This supercore is legal for use in LDR, X275, and any race class governed by an 88mm compressor inducer rule - confirm current class regulations before purchasing. It is sold as a supercore only and is compatible with all G-Series G55 and G-XRace GXR55 turbine housings. Turbine housing, speed sensor, and hardware are sold separately.