 E30 fileSame issue we were having on previous 91 files, boost tapers off in higher rpms and sets underboost fault
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04/15/2021
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2 logs from hwy pulls. Boost is only falling to 16psi now.
No faults
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04/15/2021
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2-4th gear pull We could see boost pressure would always taper down in the higher RPMs until the next gearshift and it will go back up to specified. Vehicle is not setting underboost faults anymore
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04/15/2021
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4th to 5th gear pull v5 Starting to notice boost pressure does what it’s supposed to until we get over 5000 RPM then it tapers off, as soon as there is a gearshift boost pressure goes back up to 19 psi. If you do a long fifth gear pull starting at 3000 RPM it holds boost pressure the whole time until the RPMs get over 5000
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04/15/2021
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3rd gear street pull and 2 4th gear Underboost fault set after 1st log. Cleared faults and tried two more times but saw it drop to 14psi each time so quit.
There are no mechanical boost leaks so not sure what is going on.
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04/13/2021
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