Quote:
Originally Posted by shahano
So does Map 2 slip as well?
my question: The M5 with a JB4 has alot more torque than the S55 with a map, yet the M5 does not have any clutch slippage. Why does the M4 have some? Especially since they are the exact same DCT. Something doesnt sound right.
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You are confusing a few things.
First of all, I don't recommend Map 2 on pump gas for the ZCP. If you wanted to use Map 2, this problem wouldn't be there, because Map 2/3/5/7 uses pedal input and RPM to vary additive boost targets over the stock boost targets. Map 1 doesn't use pedal/RPM input and is commanding 4psi over stock boost pressure, regardless of pedal input/RPM, which is causing lazy shifts during moderate partial throttle due to the TCU expecting X-Amount of boost, but actually getting 4psi more. The TCU just isn't locking the clutches with enough force in these conditions.
Second of all, the clutches aren't slipping under WOT. It's just a software tweak in the TCU , which controls the DCT and how hard the clutches clamp at a given load.
Third, the M3/4/5/6 all use the same DCT with the same clutches. It is the software in the TCU that is different and has different clutch lock up parameters.