JB4 Plug and Play Tuning Box Piggyback ECU Module for Ford Fiesta ST 2013-2023 1.6/1.5 EcoBoost
JB4 Plug and Play Tuning Box Piggyback ECU Module for Ford Fiesta ST 2013-2023 1.6/1.5 EcoBoost
JB4 Plug and Play Tuning Box Piggyback ECU Module for Ford Fiesta ST 2013-2023 1.6/1.5 EcoBoost
JB4 Plug and Play Tuning Box Piggyback ECU Module for Ford Fiesta ST 2013-2023 1.6/1.5 EcoBoost
JB4 Plug and Play Tuning Box Piggyback ECU Module for Ford Fiesta ST 2013-2023 1.6/1.5 EcoBoost
  • Load image into Gallery viewer, JB4 Plug and Play Tuning Box Piggyback ECU Module for Ford Fiesta ST 2013-2023 1.6/1.5 EcoBoost
  • Load image into Gallery viewer, JB4 Plug and Play Tuning Box Piggyback ECU Module for Ford Fiesta ST 2013-2023 1.6/1.5 EcoBoost
  • Load image into Gallery viewer, JB4 Plug and Play Tuning Box Piggyback ECU Module for Ford Fiesta ST 2013-2023 1.6/1.5 EcoBoost
  • Load image into Gallery viewer, JB4 Plug and Play Tuning Box Piggyback ECU Module for Ford Fiesta ST 2013-2023 1.6/1.5 EcoBoost
  • Load image into Gallery viewer, JB4 Plug and Play Tuning Box Piggyback ECU Module for Ford Fiesta ST 2013-2023 1.6/1.5 EcoBoost

JB4 Plug and Play Tuning Box Piggyback ECU Module for Ford Fiesta ST 2013-2023 1.6/1.5 EcoBoost

£687.70
£687.70
Sold out
Tax included. Shipping calculated at checkout.

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.

Unlock proven gains from your Ford Fiesta ST with the JB4 plug and play tuning box. Designed for the 2013 to 2023 Fiesta ST, this advanced piggyback works alongside the factory ECU to optimise boost, timing and fuelling for stronger performance and reduced turbo lag. On a stock car, customers typically see up to 40 hp and 70 lb ft at the wheels. Installation is discrete, reversible and VIN-unlocked, making it an ideal aftermarket upgrade available from Nforcd.

  • Up to 40 hp and 70 lb ft to the wheels on a stock Fiesta ST
  • Plug and play piggyback with CANbus and OBDII integration, data logging and fault code read/clear
  • Built-in safety strategies manage boost by temperature and drop to low boost if knock, lean, overboost or overheating is detected
  • Preloaded maps including Map 1 at approximately +4 psi over stock, with options for 91 and 93 octane and E85 ethanol blends
  • JB4 PRO Bluetooth 4.0 adapter and free app available for wireless map changes, logging up to 40 parameters and boost-by-gear control
  • 64 MHz processor sampling 800 times per second via dedicated 10-bit converters, billet aluminium enclosure, made in the USA with a 5-year warranty

Day-to-day drivability remains smooth and fuel economy during normal driving is unchanged. The JB4 can be removed without trace and is compatible with all driving modes. For best results, use 91 octane fuel or better.

Vehicle fitment
2013 to 2017 Ford Fiesta ST 1.6 EcoBoost l4 Turbo Mk2
2018 to 2023 Ford Fiesta ST 1.5 EcoBoost l3 Turbo Mk3

Nforcd knows this product well and it continues to be a popular choice with Fiesta ST owners looking for a high quality tuning module without opening the ECU. Order online with confidence. Prefer professional installation? Fitting is available at Nforcd in Warwickshire. Request a fitting quote via Sales@nforcd.com.