BMW Z4 (2003-2005) MS45 ECU Tune - Alpha-N

See our full write-up for more details and other tuning options!

Alpha-N: We are the ONLY tuners which can offer forced induction Alpha-N tunes for MS45. With an Alpha-N tune, the MAF sensor is eliminated, and load is calculated based on throttle plate angle (Alpha) and engine rpm (N). The advantages of alpha-n tuning are: background compensation tables are bypassed; internal ECU airflow and load limiters become irrelevant; the tuning process is streamlined; and maximum engine power can be extracted. This is why nearly every aftermarket supercharger kit for naturally aspirated BMW M cars uses Alpha-N, and our development of high powered M cars has led us to expand our offering of high quality Alpha-N tunes to MS45 owners. Tuning an ECU to run in Alpha-N mode requires extremely precise mapping which other tuners simply are not capable of!

Each tune includes our remote flash tuning and data logging software, up to four hours of remote dyno tuning support, and up to five revisions via data logs over the course of six months. We do NOT support cheating emissions requirements!

Handheld Flash Tuner: Some customers desire the ability to flash between tunes without taking a laptop with them. Our handheld, touch screen flash tuner ("programmer") stores up to five tunes which can be flashed to the vehicle's ECU in approximately two minutes. Our Stage 1/2/3 and Alpha-N tune purchases include a FlashApp license, so this purchase is NOT required in order to upload tuned files to the ECU and is offered as an additional add-on. 

Additional Tunes: Three additional tunes can be purchased for $500. Examples include normal/high boost, summer/winter, high/low altitude, pump/race gas, E85, OBD2 monitoring on/off.

FIC Fuel Injectors: Severn Tuning recommendations are as follows.

365cc - Naturally aspirated applications on pump gas, flex fuel, or full E85. Forced induction up to 300 whp on pump gas.

650cc - Forced induction engines up to 350 whp on E85 / 450 whp on pump gas

775cc - Forced induction engines up to 420 whp on E85 / 560 whp on pump gas

1000cc - Forced induction engines up to 540 whp on E85 / 720 whp on pump gas