Skip to product information
1 of 1


BMS BMW N55 B58 JB4 EWG Add On Connector (M135i, M140i, M240i & 335i)

BMS BMW N55 B58 JB4 EWG Add On Connector (M135i, M140i, M240i & 335i)

Regular price $55.00
Regular price Sale price $55.00

Price Match
View full details

For 2014+ F Series N55 & B58 motors that have an electronic wastegate. This add on patch allows your JB4 to directly control your electronic wastegate raising the boost ceiling for more heavily modified N55 & B58 vehicles such as those using E85 or water/meth injection. Connector is not used on map1 or map2 even if installed.

Additional information and directions are posted here:


Additional Information for the B58 engine using EWG:

Can I run E85 with this platform?

E85 can be mixed in but with trade offs. The BMW B48/B58 platform has an internal fuel cap that causes the DME to reduce it's internal boost target as fuel volume increases above expected levels. Since E85 requires a higher fuel volume the net result is a lower boost target. While small mixtures of 10-20% can be used to increase lower octane fuels expect a little less boost when running it. If equipped with the factory PPK tuning the internal fuel limit is higher and you can effectively get away with a little heavier ethanol mixture.

What is the optional EWG harness for?

This plugs in to the JB4 connector using the same directions as the N55 EWG plug (purple in #9, blue in #16) and allows the JB4 to increase or decrease the wastegate dutycycle directly. Cars running a WMI kit may benefit with the JB4 being able to more effectively add boost. While those with certain exhaust modifications may benefit from having the JB4 reduce wastegate dutycycle to prevent boost creep and throttle closure.


Identifying Wastegate Type


Compatible with F Chassis N55 & B58 JB4 with Electronic Wastegate.


To ensure the part(s) you have ordered fits your vehicle, we run a compatibility check prior to dispatch. We can do this either using your registration number(UK) or the last 7 digits of your VIN. Simply enter your car details prior to checkout. 




Manufactured by

Burger Motorsports



BMS do no offer warranty on this product

  • Price Match Guarantee

    We are committed to giving you the best price. if you find a lower price on the same item at an eligible UK retailer website, we will match it.

  • Next Day UK Delivery

    For in stock items, get FREE Guaranteed next day UK delivery for orders over £199, excluding delicate items, larger items and certain remote postal codes/areas. Same day dispatch available if your order is placed before 1pm UK Time.

  • Worldwide Shipping

    We ship worldwide via DHL International, simply enter your full address at checkout to see the shipping option(s) and quote(s). Same day dispatch available if your order is placed before 1pm UK Time on all in stock items!