Forge Motorsport BMW N13 1.6T Diverter/Recirc Valve Upgrade – Billet Piston DV, Compressor Bypass (CBV) – Fits F20 F21 1 Series 114i 116i 118i 120i & F30 3 Series 316i 318i – OEM Turbo Bypass/Dump Valve Replacement, Boost Leak Fix – ECU Controlled

Forge Motorsport piston-operated compressor bypass upgrade for BMW N13 1.6 turbo engines

Transform the way your N13-powered BMW manages boost with Forge Motorsport’s alloy piston recirc unit. The factory electronic membrane valve is well known for tearing and bleeding off pressure, especially on tuned cars. This robust, serviceable assembly swaps the fragile diaphragm for a precision-machined piston that holds boost consistently and keeps your turbocharger happy on fast road and mapped setups.

Suitable for BMW F20 and F21 1 Series and F30 3 Series models including 114i, 116i, 118i, 120i, 316i and 318i, this is a straight swap for the stock electronic pressure relief valve. It retains full ECU-managed operation for smooth drivability while delivering dependable boost control on standard software, Stage 1 and Stage 2 calibrations.

Why enthusiasts choose this upgrade

• Piston design replaces the failure-prone rubber membrane to prevent boost loss and limp performance
• Billet aluminium construction for heat resistance, strength and long-term reliability
• ECU-controlled actuation maintained for OE-like drivability with sharper throttle response
• Includes stiffer spring to suit higher boost targets on remapped cars
• Ideal for warm climates and hard-driven vehicles where the stock unit can struggle
• Direct-fit compressor bypass solution that helps eliminate turbo flutter and surge on lifted throttle

Compatibility

• Engine: BMW N13 1.6 turbo petrol
• Platform: F20 and F21 1 Series - 114i, 116i, 118i, 120i
• Platform: F30 3 Series - 316i, 318i
• Replaces the factory electronic compressor bypass assembly

What’s in the box

• Piston valve assembly
• Machined alloy connector
• Vacuum hose
• Uprated spring
• Electronic solenoid

Proven on the road

We have installed this on our own builds and customer vehicles. Feedback is consistently positive: stronger boost retention, crisper response between shifts and peace of mind that the stock diaphragm issue is addressed. A simple, effective reliability and performance upgrade for the N13 turbo system.

Installation and support

Professional fitting recommended. Book fitting with MJ Modifications in Warwickshire. For a quote, email info@mjmodifications.co.uk.

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