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      11-23-2012, 03:54 PM   #1
Neon01's Avatar

Drives: 12 X5 35i
Join Date: Jun 2007
Location: Bel Air, MD

iTrader: (8)

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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).
12 X5 xDrive35i | Platinum Gray | Oyster | Burl Walnut | Premium | Convenience | 3rd Row | Apps
13 Audi S4 | Misano Red | Black
04 S2000 | Berlina Black | Black