F55/F56 Where is the stock Boost controller?
#1
#5
Anyone know why my boost comes in late (lag till 2900rpm), than spikes (way to high), and then falls off after 4300 from 19 psi down to 11 psi at red line. I've check map and maf sensor reading. They appear to be normal. I'm going to smoke the intake tomorrow but it doesn't really act like a boost Leak. I have 50,000 miles on my car, its a 2019 3door S. Do you guys think are turbos fail with that kind of milage ? I was in the process of custom tuning but my car doesn't log well even on a stock file. Boost and target boost are way off. Mods are jcw pro exhaust (hollowed out the second cat) intake hard pipe, drop in DRY filter, and intercooler piping
Last edited by Erkallan1; 07-27-2023 at 09:31 AM.
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