The software removes the top speed governor, enabling the cars to attain their ''natural'' top speed; and the V8 will pull right to red-line in top gear! Changes to the throttle mapping help soften throttle tip-in for a sportier feel and improved modulation capabilities. The combination of Dinan's re-calibration of ignition timing, fuel delivery, and cam timing produces a maximum gain of 9 hp @ 6000 RPM and 8 lb-ft @ 6000 RPM. Peak horsepower is increased from 414 to 421 at 7900 RPM.
The biggest benefit of a true software tune like Dinan's Performance Software is that all of the communications between the engine sensors and the engine management computer (DME) remain unaltered. This translates to properly returned fuel mixtures, ignition timing and full map rescaling to keep everything in sync. Keeping an engine running at its best and with the most reliable power is what Dinan is all about. Properly returned fuel mixtures to the DME along with a correct tune means keeping the engine running cooler with less wasted fuel. Ignition timing is a critical part of the equation to limit engine knock, one that many tuning companies ignore. Dinan Performance Software includes full map rescaling to protect the engine and keep everything running smoothly. Not to mention, BMW worked hard to build systems to protect the engine in case of a failure, Dinan keeps all of these systems in place for the safest possible tune.
More Power: Max gains of +9HP @ 6000 RPM and +8 lb-ft TRQ @ 6000 RPM
50 State Emissions legal; CARB EO # D-176-39
Improved throttle response
Improved ignition timing, fuel delivery and cam timing
Top speed governor removed
Smooth and predictable power delivery
Dinan Point Value
Factory Rated HP
Factory Rated Torque (lb-ft)
Labor Time (Hours)
Max HP Gain
9 @ 6000 RPM
Max Torque (lb-ft) Gain
8 @ 6000 RPM
421 @ 7900 RPM
Peak HP Gain
7 @ 7900 RPM
This part is legal for sale and use on Emissions Controlled Vehicles, in all 50 states, when used in accordance with the manufacturers application guide because it has a California Air Resources Board (CARB) Executive Order (EO) number.
The following vehicles are considered Emissions Controlled Vehicles:
1966 and newer U.S. manufactured California Certified vehicles
1968 and newer U.S. manufactured Federally Certified vehicles