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      11-23-2012, 02:54 PM   #1
Neon01
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Drives: 10 135i, 12 X5 35i
Join Date: Jun 2007
Location: Bel Air, MD

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Question about boost spike just after throttle lift

I assume this is normal, but just wanted to make sure. Car currently has Cobb AP stage 1+FMIC aggressive (93oct) linear throttle map. Did some logging today and pretty consistently find that my boost is peaking around 16.5-17 psi @ 4200 RPM, then tapering to about 12-13 psi @ 6200 RPM - about what I would expect. Except one or two data points after I lift throttle, at which it spikes to maybe 19-20psi, but only for a single data point. The extremely transient nature of the data there makes me believe it's not even accurately reading pressure, but I thought I would make sure.

Should I be concerned about this? The car has a ER charge pipe with Synapse BOV.

Also, what does the torque data actually tell me, if anything? I assume this is a calculated number, so I'm dubious about it's accuracy (I'm seeing peaks of close to 800 N*m, which is ridiculous, of course).
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