New 2009 2010 BMW Z4 - ZPOST - View Single Post

Alext · 02-14-2011, 05:55 PM

The JB4 OVERRIDES the stock ECU programming - it is a Piggyback system. So it doesnt matter if you have a 35i or 35is.

Now on map 1 there isn't a HUGE difference between the stock 340HP and the JB4 tune which I estimate provides around 350-360HP at the engine PEAK....maybe around what 330RWHP.

The JB4 on map1 targets around 13psi, which is basically what the 35is targets in the midrange then tapers off significantly to redline. This is where the JB4 will make the most difference.

One other thing - I would be wary of running high boost/torque on the DCT transmission...

How do the DCI's sound mated with the Z4+ DCT? I only ever use them on a manual 135i.

02-14-2011, 05:55 PM	#4
Alext Banned 138 Rep 2,042 Posts Drives: B M W Join Date: Apr 2008 Location: Everest iTrader: (2)	The JB4 OVERRIDES the stock ECU programming - it is a Piggyback system. So it doesnt matter if you have a 35i or 35is. Now on map 1 there isn't a HUGE difference between the stock 340HP and the JB4 tune which I estimate provides around 350-360HP at the engine PEAK....maybe around what 330RWHP. The JB4 on map1 targets around 13psi, which is basically what the 35is targets in the midrange then tapers off significantly to redline. This is where the JB4 will make the most difference. One other thing - I would be wary of running high boost/torque on the DCT transmission... How do the DCI's sound mated with the Z4+ DCT? I only ever use them on a manual 135i. Last edited by Alext; 02-14-2011 at 06:02 PM..
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