Performance M
Dorch Engineering S55 HPFP Lift Kit - BMW F80 M3, F82 M4, F87 M2 Competition/CS - High Pressure Fuel Pump Cam Upgrade in Vacuum Pump Assembly - Plug & Play DI Fueling Upgrade, HDP5, BM3/MHD Ready, Up to 38% More Fuel Flow - F8X Fuel System Upgrade
Dorch Engineering S55 HPFP Lift Kit - BMW F80 M3, F82 M4, F87 M2 Competition/CS - High Pressure Fuel Pump Cam Upgrade in Vacuum Pump Assembly - Plug & Play DI Fueling Upgrade, HDP5, BM3/MHD Ready, Up to 38% More Fuel Flow - F8X Fuel System Upgrade
Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.
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Dorch Engineering S55 Lift Kit delivers the extra fuelling headroom serious S55 builds demand. By increasing high-pressure pump displacement by up to 38 per cent inside a genuine BMW vacuum pump housing, this cam-lobe upgrade raises DI pump volume while keeping factory-like manners, stock safety strategies and everyday drivability intact. Perfect for F80 M3, F82 M4 and F87 M2 Competition including M2 CS.
What makes it a winning S55 fuelling upgrade
- Up to 38 per cent more pump volume for stronger, safer fuelling under load
- Drop-in vacuum pump assembly with integrated Dorch cam technology
- No line cutting, bending or crimping required for installation
- Retains all factory ECU protections and stock-like cold start behaviour
- Built around Bosch HDP5 architecture for a robust, factory-grade solution
- Ideal for tuned F8X platforms seeking reliable fuel system headroom
How the displacement lift translates
- HDP5 stock S55: 1.527 cc per camshaft revolution
- HDP5 with Dorch S55 Lift Kit: 2.100 cc per camshaft revolution
- Dorch Stage 1 HPFP with Lift Kit: 2.857 cc per camshaft revolution
Calibration and mapping
Runs on the standard software without coding. If you want to optimise, preset options exist in Bootmod3 and MHD. Simply select the Lift Kit option when flashing.
Injector guidance
The stock injectors limit the system. To fully realise the added pump volume, we strongly recommend moving to the larger S63 EU5 injectors.
What is included
- Dorch vacuum pump assembly with integrated cam upgrade
- Vacuum pump sealing cap
- Vacuum pump gasket
Compatibility
- BMW F80 M3 - all variants
- BMW F82 M4 - all variants
- BMW F87 M2 Competition and M2 CS
Real-world results you can trust
We have fitted this solution on customer S55 builds and have been consistently impressed by the stable rail pressure, smooth idle and stock-like refinement, even on demanding fast-road and track-day setups. Our customers love the confidence it brings to their power goals without compromising reliability.
Fitting and support
Professional installation available at MJ Modifications in Warwickshire. For a fitted price or to book workshop time, request a quote at info@mjmodifications.co.uk. Mail order supply with fast UK shipping is also available.
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