Enter yoMy car is a 2008 MINI John Cooper Works. The car runs ok when using the standard ECU tune, although there is a hesitation problem when going from 1/8 throttle to part throttle. When I upload the ECU tune from a popular vendor, which has run problem-free on many many cars identical to mine, the hesitation problem is exacerbated, and the car is not as fast as other cars with the same tune. I have tried other tunes from the same vendor, so I know it's not the tune, and he also is very sure that it isn't the tune. I have done several datalogs, and my tuner says that the car is retarding timing by about 5-6 degrees. My boost curve is flat and exactly where it should be. Fuel pressure seems to be ok as well. The car is difficult to drive and is******.
My brother has a 2010 MINI John Cooper Works, so I have traded a few parts with his car to see if anything on my car is faulty.
changed MAF sensor
changed both MAP sensors
changed the precat 02 sensor
changed the diverter valve
changed the pressure converter on the inlet manifold
changed the spark plugs
done a complete carbon cleaning of the inlet valves
done a smoke test to check for vacuum leaks,
probably a few other things that I've no doubt forgotten.
None of these things has fixed the problem
If you would like datalogs or any other info, my email is elietalj@gmail. Com
What about the injectors and throttle body, have they been cleaned?
If the ECU is retarding the ignition under acceleration, the ECU is seeing a reason to do so. Possibly high exhaust gas temp. Has the computer stored any codes? Try using a higher grade of fuel to rule out fuel quality issues, including higher octane. Some "tuned" engines are picky when it comes to fuel grades and quality.