Vishnu/FFTEC Offers True Flex-Fuel Functionality!
The Vishnu/FFTEC team now offers everything you need you achieve true Flex-Fuel compatibility with the PROcede Rev3. No other n54 engine controls system is better suited to offer true Flex-Fuel functionality. With it's unique ability to advance timing beyond the factory ignition timing set-point (all other CPS modules can only retard ignition timing), the PROcede has the ability to take full advantage of the enhanced cooling and knock suppression afforded by E85 fuel. What this means is that compared to other piggyback/flash solutions, the PROcede offers far superior performance, drivability, and fuel economy. And now with the release of our Flex-Fuel module, it's now time to enjoy the added convenience of no longer having to carefully monitor your E85/Gasoline ratio. Instead, you can simply fill your tank with whatever fuel you have access to at any given time (either premium grade gasoline or E85) and let the PROcede adjust your tune accordingly for maximum performance and safely!
What Is It?
The heart of our Flex-Fuel module is a Siemens Fuel Composition/Temp sensor. This sensor intercepts into the factory fuel supply line using the supplied plug-and-play push-in fuel hoses. It is firmly secured to your inner fender using a supplied mount. The sensor's output signal feeds into the PROcede's Flex-Fuel signal input via plug-and-play harness. By monitoring this sensor's signal output, the PROcede is able to detect the precise amount of ethanol in the fuel. With this valuable information, the PROcede is able to alter fuel, ignition timing and boost settings accordingly to achieve ideal combustion and power. Also included in the package is a PROcedeFlash DME update that eliminates various fuel/ignition restrictions present in the factory DME code.
Why Is It Important?
Unlike the gasoline formulations available at fuel stations across the country, E85 formational varies significantly depending on time of year and geographic location. This means that the actual ethanol content of E85 can be as low as 70% or as high as 90% depending on these external variables. And since ethanol is the component that is largely responsible for in-cylinder cooling and knock suppression, it is critical for the tuning solution to know actual ethanol content in order to proactively adjust fuel, ignition and boost curves accordingly. It is no surprise that all OEM FlexFuel vehicles around the world are equipped with the same or similar sensors.
What Kind of Performance Gains Should I Expect?
On a n54 powered BMW running nothing more than a set of dual cone intakes, expect gains of approximately 140WHP and 140LB-FT when running with an ethanol mixture of at least 60% (approximately 50% E85 and 50% premium grade gasoline).
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On a n54 powered BMW running nothing more than an upgraded FMIC and a set of dual cone intakes, expect gains of approximately 145WHP and 160LB-FT when running with an ethanol mixture of at least 60% (approximately 50% E85 and 50% premium grade gasoline).
(Click HERE to enlarge)
Why is the PROcede/PROcedeFlash combination able to make more power than other tuning options while still giving the user the flexibility to run any E85/gasoline ratio?
Unique to the Procede's CPS offsetting logic is the ability to advance (not just retard) ignition timing. While this feature rarely comes into play when running pump gas, it has enormous benefits when running high octane fuels such as E85. So when combined with an underlying DME flash tune that raises fuel system limits and smoothens lambda and ignition advance curves, the Procede can unleash its entire repertoire of engine control functions:
Here is what happens when we whittle away the Procede functionality, one by one, from the underlying flash tune while still running the same fuel (@60% ethanol content) on the same car. First, we disable the Procede's positive ignition advance offsets and immediately see a loss of up to 25WHP throughout the entire power-band. The advantage of making power through running optimal ignition advance is that it doesn't require more fuel flow. Instead, it improves brake specific fuel consumption (BSFC) which translates to lower exhaust gas temperatures and less stress on the vehicle cooling systems.
Next, we remove the PROcede's air/fuel ratio adjustments. Keep in mind that the underlying flash tune already target's a reasonably aggressive lambda setpoint curve suitable from high octane fuel. Even still, eliminate the PROcede-induced offsets, reduces power output by up to 12WHP at high engine speeds. Again, more power with less fuel consumption.
Next, we remove the PROcede's exemplary boost control system and relying only on the factory DME's wastegate control system logic which reduces boost to approximately 13psi. The result is an immediate 75WHP loss and noticeable loss of boost response and stability:
What kind of power can I expect with a stock FMIC?
Well over 400WHP. Here is a dyno result from a 2007 335i with absolutely no other modifications other than DCI:
What kind of boost, timing and AFR do these FlexFuel tunes target?
With an ethanol content of at least 50%, expect boost to be in the 17-20psi range depending on other modifications. AFR curve will be in the 12.1-12.5:1 range at full load. And max Ignition timing will be 11-12 degrees tapering upwards to 15-16 degrees at high RPM. Here is a Mustang dyno traces and a few PROcede road testing datalogs taken from both the DCI-only and DCI+FMIC cars described above (@ 50% ethanol content):
How difficult is it do the Flex-Fuel conversion and how invisible is it to the dealership?
Installing the flex-fuel system is very simple. We supply all the plug-and-play fuel lines, mounting brackets and wiring harness that plugs into your Procede Rev3 harness. This means that the entire installation isn't any more difficult than installing a charge pipe. The PROcedeFlash DME update does require you to mail your DME to us for reflashing. We can usually return your DME the same day we receive it which means that your vehicle will be inoperable during this time (2-4 days depending on shipping options). And unlike other DME flash options, we modify your existing software version as opposed to rewriting custom code onto your DME. This means that there are no telltale signs of DME tampering at the dealership level. Upon interrogation, the DME software version will be original and unadulterated.