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RENNtech ECU Upgrade Z4 35iS E89 (2008-2012 N54B30to)

RENNtech ECU Upgrade Z4 35iS E89 (2008-2012 N54B30to). Up to 420 HP + 435 TQ.
Gains: +100 HP & +103 LB-FT
Retail price without tax: $1,495.00

Our proprietary BMW ECU upgrade offers rock solid performance from RENNtech, the foremost tuning authority on Bosch and Siemens engine control units.

These same units are utilized in Mercedes Benz vehicles, which RENNtech has been tuning since electronic engine management started to show up in vehicles during the mid 1980's, though our proprietary tuning software and approach for BMW is completely unique and independent from our Mercedes tuning program.

RENNtech tuning software for BMW offers significant gains in performance and throttle response without sacrificing your daily driver BMW's reliability.

By modifying ignition timing and throttle mapping, optimizing air/ fuel ratios, increasing the top speed limiter, improving engine cooling and modifying boost mapping for turbo charged vehicles; RENNtech performance software unleashes your BMW's true potential.


Z4 35iS  E89 (2008-2012 N54B30to) Stock Performance:

  • 320 HP / 332 TQ

Modified Performance:

  • 420 HP @ 5700 RPM / 435 TQ @ 4300 RPM



  • +100 HP / +103 LB-FT


Contact us

7825 SW Ellipse Way, Stuart, FL 34997
(+1) 561 - 845 7888
Mon - Fri 9am - 6pm


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7825 SW Ellipse Way - Stuart, FL 34997
TEL: 561.845.7888 FAX: 561.845.6777 E-MAIL: