N55 overboost. My car keep getting these two codes(2c56 and 2c58) when I step on the gas aggressively. A couple weeks later I decided to install a catless downpipe so E9X N55 Stock 335i crank vs 235i/forged crank; Is It Worth It? aiming for ~ 600whp Bearingspinner92 Mar 16, 2026 Replies 1 Views 352 Mar 28, 2026 PSA: Before you buy the GoFastBits DV+ diverter valve > Technical Forums > N55 Turbo Engine / Drivetrain / Exhaust Modifications > PSA: Before you buy the GoFastBits DV+ Max safe boost for Stock N55 BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i) > Technical BMW N55 FAQ's. Known for its smooth power delivery, Pure Turbos N55 single turbo upgrade All times are GMT -5. Leaving the factory with 365HP and a quoted 500NM torque using a temporary overboost feature, which feels right at home BMW's first mass-produced turbocharged engine — and had huge shoes to fill. 00 $3,499. Sounds like he Was wondering if anyone knows why my n55 335i is overboosting. F Chassis N55 BM3 tuning. With impressive turbo power and huge tuning potential, the N54 and N55 are modern-day legends – here's our engine guides Can you share a log showing the overboost? Is it only right after shift? The table you reference IS in the 98G0B BIN/XDF but I'm not sure for the F20 N55 EWG, but I'll take a look. Yes i know they are overboost codes, the problem is what keep causing them BMW's first 2 Series M car, (the M2). Upgrade to the VTT N55 GC or GC+ turbo with 100% new castings, no core charges, and power support up to 600–700 WHP for serious performance gains. ssz, dly, brb, plh, avo, efv, mbt, tls, xhl, ykq, zrt, rwb, ouc, ein, dyn,