Platform · Audi / Euro (Eaton)
Audi & European Supercharger
Porting & Rebuild Services
The Eaton M62 and M90 are precision units. FAS treats them accordingly.
Why Audi & Euro Owners Come to FAS
The Eaton Roots-type supercharger family — M62, M90, and related units — is used across a wide range of European performance vehicles: Audi A4/S4 (B5, B6), Audi A6/S6 (C5), Volkswagen Golf R32, and others. These are tight-tolerance, finely engineered units that respond well to skilled modification — but are less forgiving than domestic blowers if the work isn't done correctly.
FAS has the machining background and the precision to work on Euro supercharger platforms. Owners who have been told "we don't work on those" elsewhere find what they need here: proper porting, accurate rebuild tolerances, and a shop that understands the difference between an Eaton M62 and an American-market Roots blower.
Audi / Euro Supercharger Services
Eaton Supercharger Porting
FAS precision ports the Eaton M62, M90, and compatible units for improved inlet and outlet flow efficiency — hand finished, measured, and documented. Applies to Audi S4/S6, VW applications, and compatible Euro platforms.
Shop Eaton Porting →Supercharger Rebuild
The Eaton units are rebuildable — rotor packs, bearings, and seals. FAS rebuilds to precise clearances with documented specs. A rebuild restores output and extends service life significantly for owners running aging units.
Book a Rebuild →Bearing Replacement
Bearing failure in an Eaton M62/M90 typically presents as noise or inconsistent boost. FAS replaces bearings as a standalone service before the issue progresses to rotor contact.
Shop Bearing Service →Technical Detail
The Eaton M62 (used in the B5/B6 Audi S4 and related applications) is a 62 cubic inch Roots-style blower. It's a compact, lightweight unit designed for the tight engine bays of European sport sedans. The M90 (90 cubic inches) appears in larger-displacement Euro applications and some GM products.
The Roots design in these applications is a positive-displacement blower — linear boost curve, low-end torque, good response. The limitation is the same as every Roots blower: the factory port geometry is not optimized for maximum flow efficiency. The inlet and outlet transitions leave measurable restriction that FAS addresses through precision porting, hand finished.
Key difference on Euro builds
Tolerances are tighter from the factory, and the margin for error in porting is smaller. FAS takes the same precision approach on Euro units that we apply to domestic blowers — the difference is that we don't treat them as afterthoughts. Every Eaton unit that goes through FAS gets the same documented spec sheet as a Hellcat or LT4 job.
For owners considering a rebuild: an Eaton M62 with worn rotors and degraded seals typically loses 10–15% of its effective boost output before it becomes audibly symptomatic. A proper rebuild restores full efficiency and often outlasts the vehicle's remaining service life if maintained correctly.
| Unit | Displacement | Applications | FAS Services |
|---|---|---|---|
| Eaton M62 | 62 cu in | Audi B5/B6 S4, A4, VW | Porting, rebuild, bearings |
| Eaton M90 | 90 cu in | Audi A6/S6 C5, some GM | Porting, rebuild, bearings |
| M122 / M112 | 122/112 cu in | Mustang GT500, GM LSA | Porting (see M122 page) |
Frequently Asked Questions
Does FAS work on Audi 2.7T biturbo builds as well as supercharged platforms?
The Audi 2.7T is twin-turbocharged, not supercharged — a different service category. This page covers Eaton supercharger platforms. Contact FAS to discuss turbo work availability.
The M62 on my S4 is making a whine. Is that the supercharger?
Often yes — either bearing wear or rotor-to-housing contact as clearances open up. The M62 is a precision unit; don't ignore early symptoms. FAS can diagnose from a video and sound clip before you commit to shipping.
Can you rebuild an Eaton M62 with worn rotor tips?
Depends on wear depth. Minor wear is often addressed by precision clearance matching. Severe tip wear requires replacement rotors, which FAS sources on a case-by-case basis. Send photos before shipping.
Is the Eaton porting worth it on a stock B6 S4 build?
On a supporting build with intake and tune, yes — the porting improves airflow efficiency and reduces inlet temps, which is particularly relevant on the tight packaging of the B6 engine bay. On a completely stock car with no other mods, the gains are smaller but the reliability benefit of a properly rebuilt/ported unit is still real.
How do I ship an Eaton M62 to FAS?
FAS accepts shipped cores. The M62 is small and ships easily in a standard box with proper padding. Contact us before shipping to confirm applicability and get a job number.
Does FAS work on VW Golf/GTI supercharger builds?
Yes, where the platform uses an Eaton-type blower (certain Golf R32 and G60 applications). Contact FAS with your specific model and we'll confirm service availability.
Ready to rebuild or port your Eaton supercharger?
FAS Motorsports — 6161 Riverside Dr, Punta Gorda, FL. Shipped cores accepted nationwide.