Holden VS-VY L67 S/Charged V6 3.8L
If you're building for real power, especially in a L67 Holden platform, the Whipple 2.4L twin-screw is worlds ahead in performance and upgradability. The factory L67 M90 is okay, but it's not in the same league as a properly tuned Whipple.
Below is a comparison of the Holden V6 L67 Eaton Roots blower unit to a Whipple Twin Screw 2.4L Gen 4 blower:
1. SUPERCHARGER DESIGN & ROTOR TECHNOLOGY
| Feature | L67-Eaton M90 | Whipple Gen 4 (2.4L) |
|---|---|---|
| Type | Roots-style | Twin-screw |
| Rotor Design | 3-lobe Roots | Latest Gen 4 intermeshing screw rotors |
| Compression | External (in intake) | Internal (in housing) |
| Efficiency | less efficient | Optimized axial & radial flow for maximum volume |
The Gen 4 Whipple uses a refined and efficient rotor profile that reduces turbulence and friction, resulting in cooler air and significantly more power per PSI.
2. EFFICIENCY & BOOST CHARACTERISTICS
| Attribute | L67- M90 | Whipple Gen 4 |
|---|---|---|
| Thermal Efficiency | Moderate to low | Very high |
| Intake Temp Under Boost | Hot | Much cooler |
| Boost Capability | ~10–12 PSI max (efficiently) | 20–25 PSI capable with minimal heat soak |
| RPM Range | Strong low-end, fades at high RPM | Strong low-end and continues pulling hard through redline |
3. HORSEPOWER POTENTIAL
| System | Max Power Potential |
|---|---|
| Eaton M90 | ~350–400 HP (typical street builds) |
| Whipple Gen 4 2.4L | 600+ HP |
The Gen 4 Whipple is engineered for serious high-horsepower builds and motorsport applications, while the M90 remains a moderate OEM-grade option.
4. BUILD QUALITY & ENGINEERING
| Feature | L67 M90 | Whipple Gen 4 |
|---|---|---|
| OEM-Style Casing | Yes | No – billet or cast aluminium cases |
| Rotor Coating | Standard | Advanced Teflon-coated for wear and thermal resistance |
| Bypass Valve | Basic internal | High-efficiency integrated bypass system |
| Drive System | 6-rib (typical OEM) | 6/8/10-rib billet independent drive system (as supplied by Yella Terra) |
5. SOUND & RESPONSE
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Eaton M90: Noticeable whine under load with a traditional OEM-style sound. Boost comes on early but drops off at higher RPM.
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Whipple Gen 4: Deeper, more aggressive tone with a crisp whine. Smooth, linear boost curve that continues to build power from idle to redline.
The Whipple Gen 4 L67 Upgrade absolutely crushes the Eaton M90 in efficiency, power delivery, cooling, durability, and overall engineering. If you're chasing real, reliable power in a Holden V6 platform, the Gen 4 Whipple with the AiR to AiR manifold is the only serious choice.
