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      01-15-2015, 04:41 PM   #89
TDIwyse
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Drives: 2011 335d
Join Date: Aug 2012
Location: MidWest

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Was playing around on the drive home from work. Got a couple higher rpm data points to register for a full fueling 4th gear pull.

The BMWhat log of the "low pressure" turbo set point is the one for the big turbo that starts coming online at ~2800 rpm. It's interesting to see it coming online as the rpm's rise. Above ~3000 rpm the analog gauge agrees extremely well with the values BMWhat is giving for the low pressure boost setpoint (when you subtract the ~14.7 psi for normal atmospheric pressure... which is what "gauge psi" represents, and is what the 2nd plot is showing along with EGT's).

With the EWG the peak boost on the analog gauge is clipped at ~32-33 psi at the ~2800 rpm point where the big turbo is coming online, but it maintained ~31-32 psi through the pull. This agrees very closely with the BMWhat setpoint boost for the low pressure turbo.

Interestingly, the drive pressure to boost pressure at those upper rpm's is also looking extremely good... much better than I feared. Think I'll pull back the EWG a little to allow more boost...
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2011 335d 11.68 @ 125.71 mph 1/4 mile NHRA certified track
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