JB4 - VW Golf R, Golf GTi, T-Roc R, Seat Leon Cupra, Audi TTS, Audi S1, S3, A1, A3, A4, A5, Skoda 1.8/2.0TSi EA888 Gen3 group 1-6

Sale price £329.00 Regular price £419.00

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JB4 - Audi S3, Golf R, Golf GTi, Seat Leon, Audi TTS, Audi S1.....

The MQB JB4 is by far the most advanced tuning box available for the platform. The MQB JB4 connects to your MAP, TMAP AFR line and OBD as standard. With the OBD connection, the JB4 has access to real time engine data which it uses for tuning, logging and also safety. No other MQB Golf R, Audi, Seat tuning box on the market uses real time canbus data, or has the safety systems like the JB4. If the JB4 detects any engine parameters going wrong, it will revert to a safety map.

The MQB JB4 mas multiple maps to support all levels of tune. Maps and firmware are regularly updated and enhanced, which you can download for via either by the optional USB data cable or Bluetooth connector for free. Maps include and can support hardware for stage 1, stage 2, stage 3 and even methanol injection. 

With the optional FSB and meth kit, the JB4 has fully integrated meth mapping and safety. For example, if the JB4 detects low meth flow, it will automatically revert to a low boost safety map, preventing any dangerous engine knock. A question we regularly receive at Bolt ON Mods regards meth and JB4 is, "is it complicated to tune and set up?" The answer is no. The meth map built into the JB4 makes it all very simple indeed. You simply adjust the "boost additive" in the meth map screen in the app for the level of power you want. BMS have perfected this and we advise keeping to the default settings as they are already so well dialled in for stock turbo applications. 

The JB4 has many other features as well as those for tuning. These include datalogging, code read/writing, can flap control, boost by gear control, stacking with flash tunes, and much more.


• Audi S3 8V
• Audi S3 Facelift
• Audi TTS 8S
• VW MK7 Golf R
• VW GTI Clubsport ED40
• VW MK7.5 Golf R
• VW Aerton 2.0T 280hp
• B8 Passat 2.0T 280hp
• Seat MK3 Leon Cupra
• Seat Ateca Cupra 

• Seat Leon Cupra 290
• Skoda Superb 280
• Skoda Superb 272PS 4x4

• VW MK7 Golf GTI and GTI Performance Pack
• VW MK7.5 GTI & 245hp PP
• VW MK7.5 GTI TCR 2019
• VW Tiguan II 2.0TSI 220hp/162kw (Non-US models only)

  VW T-Roc R 

• Audi A3 8V 2.0T
• Audi TT 8S

• Skoda Octavia RS and 245HP
• Skoda Superb 2.0T

• VW Polo 6C GTI
• Audi A3 8V 1.8T FSI
• Audi A1 1.8TFSI
• Skoda Octavia 1.8T FSI
• Seat Leon SC FR 1.8TSI
• Seat Leon FR 2.0 TSI
• Seat Ibiza Cupra 1.8TSI
• 2020 Seat Leon Cupra ST R 2.0L 300PS 4WD with EA888 Engine

• Audi B9 A4 2.0TFSI 252hp
• Audi B9 A4 2.0T Allroad
• Audi B9 A5 2.0T TFSI 252hp
• Audi B8.5 A5 2.0T TFSI 220hp 
• Audi A6 2.0T TFSI 252hp
• Audi Q7 2.0T TFSI 252hp
• Audi Q5 2.0T 252hp*
• Porsche Macan 2.0T 252hp*

Also fits facelift models.

Full instal instructions and map guides can be found on N54tech.com