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      02-15-2013, 01:03 AM   #15
Private First Class

Drives: Z4 35i DCT
Join Date: May 2006
Location: Italy / Chile

iTrader: (0)

Originally Posted by Asbjørn View Post
Again, perhaps a stupid question, but are you sure that is not because the turbo boost has increased as the exhaust flow is less restricted?

Or is it somehow controlled by the ECU? And if so, is the explanation that target boost is reached faster due to lower flow resistance?
The turbo boost is controlled by the ECU: with stock map it is aprox. 8 psi and as you say, with decatted DPs, this target is reached faster due to the lower flow resistance. With JB4 map 2 (my case) the boost grown up to 15 psi due to the input signal of the modified ECU and, once again, those psi are reached faster due to the lower flow resistance of the decatted DPs.
2012 Z4 35i DCT Black/Beige - 20" Vossen CV3, PB-Brake BBK, ///M Front Bumper, ///M Steering Wheel, Led Angel Eyes, Black Grille, Short Antenna - Tuning: JB4 Map 2, Custom Made 3" DPs & MPs, BMS Dual Intake - Desire list: 3D Design Front Lip, Meth Kit, FMIC.