Finally after more than a year development our stage 1 tune for 335D and X5 35D is close to official release. As I may have mentioned before I have been taking care of the logistics and development and Raymond from TRF Performance-Norway has been taking care of the of the re-mapping of the DDE. With the modern tuning software probably the first grader can do it, but it takes experience and some desire for perfection to do it right. The development has been going for more than a year and we have met more than a few well masked barriers in the EDC17 (DDE in our X5 diesels). It is very easy to mask some stuff here and there, disable the trouble codes and call it a day, but we spent more time to get to the bottom of every problem. In it's distilled form now stage 1 only consists of a different fueling strategy which leads to slightly increased boost and more than slight bump in the power output. Most factory limiters are untouched, and so is the transmission torque limiter. Boost maps are untouched too and the increase comes from the better efficiency of the engine because of the optimized fueling strategy. Many tuners also play with the advance in a relatively stock engines leading to emission problems.
We are not ready yet with the pricing, there are special discounts planned for the fellow X5D members on Xoutpost.
We spent around 6 hours on the dyno trying to get the best out of the X5. With this transmission it is impossible to load the car properly especially at low RPM. We've been doing 4th and 5th gear pulls on deserted freeways and if you roll on the gas for more than 40% under 3000 RPM it will downshift immediately. We had cases when it downshifted from 4th to 3rd at full load at almost 3700 RPM which is absolutely illogical. So there is no way we can load it under 2500 RPM and the real torque curve is shifted massively to the right. The correct numbers would be higher and at lower RPM. However the graph gives a good idea how much the tune has changed the character of this engine. It pulls hard and to the redline (the transmission shifts at around 4600 RPM, so there is a lot of power lost there too) and feels much more like gas engine.
Of course you have to take this graph with a grain of salt as the baseline dyno is missing. Yesterday we got the news from the dyno operator that the files were lost and all i have is a printout of the best run. The car is already converted to Stage 2 so there is no going back. The Mustang dynos are pretty accurate, but it is what it is. Stock it pulled out something in the vicinity of 220whp/360wtq. 18-20 % are a good guess for the drivetrain and tire friction loss.
Stage 2 is up to the point of 400hp/550tq + without substantial smoke or uncivilized behavior. More to come soon
10-21-2015, 01:03 AM
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