Fxx 640 TUNE
This is our tried and tested tune for an Fxx 640 with an N55 engine. These tunes were designed on a Dynojet dyno and tested in the real world! A Windows computer is required to utilize the RK-Tunes flash software. Check FAQ section for windows device recommendation.
⦁ Increased boost pressure
⦁ Top speed governor removed
⦁ Increased RPM rev limit
⦁ VANOS cam timing adjustment
⦁ Improved throttle response
⦁ Increased valvetronic valve lift
⦁ Ignition timing enhancements
⦁ Air/Fuel Ratio enhancements
⦁ Fuel - Selectable fuel octane rating (91, 93)
⦁ Burble - Emits flame and backfire when lifting off throttle. Only suggested for catless exhaust systems.
⦁ Rear O2 Sensor Delete - If you are running aftermarket headers please select O2 Sensor delete. We will remove all coding associated with rear O2 sensors
⦁ Cold Start Delete - All N63's have a cold start calibration to heat up the catalytic converters. If you're unhappy with the way your N63 idles/runs while cold, select this option and we will adjust the cold start in your tune. Highly advised if you are running a catless exhaust system.
PERFORMANCE SPECS BASED ON MODIFICATIONS:
50+ FT/LBS TQ
For this tune you can mail in your DME for the initial flash or you can use the flash cable option if you have a windows computer/laptop for the initial flash. We supply instructions on where to download our software and how to use the flash cable. Each map change takes under 2 minutes. This will allow you to turn on and off burble, cold start, switch between stock and your performance tune, and/or any other options we offer for your DME. Please see our DME Tuning info tab at the top of this page for more information. In the modification box, please specify all current vehicle modifications and desired options.