I'm glad somebody has a working setup, but it kinda pains me to see someone go through all that trouble, and not pay attention to the basics, and do a little bit of homework beforehand to get things sized properly. It really seems as if this setup was done on the spur of the moment with stuff that was just sitting around. That turbo and the intercooler are just too large for the airflow required by the 2.5L at only 6 psi, it may be better suited for more like 16-20 psi on that engine, though that would require a completely custom bottom end and trans to handle the resulting power.

oh, and goodwin, I hate to argue semantics, but the fact that there is nothing before 4400 rpm is not turbo LAG, but is a function of the boost threshold. Boost threshold is the minimum rpm where appreciable boost is made, lag is the time it takes (while cruising above the boost threshold) for the turbo to spool up when the throttle is opened up. Boost threshold is really a matter of how well the overall turbo is sized, both the compressor and turbine sides. Lag is mostly (though not all) a function of turbine sizing.

Also previously mentioned, is that the BOV NEEDS to be vented back into the intake tract rather than to atmosphere. This is most definately causing the stalling problem, as the air has already been metered by the MAF sensor, and the engine is expecting it. Also, I would move the MAF sensor further up that section of straight pipe, and be sure to have a flow straghtening screen in front of it, this would give more accurate and consistant readings of the actual airflow into the engine, allowing the PCM ot better control fuel delivery. also, the a/f ratio curve looks like the swiss alps, this is a bad thing, especially those 2 very lean peaks. This setup is in dire need of a proper recalibrated chip using the stock PCM's load based table setup, this is the best way of ensuring proper fuel delivery (and a/f ratio) under all conditions (any rpm and boost condition possible) I would be interested to know the changes to the fuel system used to make the system capable of supporting the power you are making, whether it be larger injectors, larger fuel pump, rising rate fuel regulator and/or any combination of those (I suspect only the last is being used here)

It's all about balance.

bcphillips@peoplepc.com