N54 Stock Turbo Psi, I have a 2008 335i with a Doc Race single turbo upgrade. Well that I understand. Upgraded inlets and outlets work in more or less the same Generally speaking, depending on fuel and timing, stock twins are happy up to ~18-20psi. 14, if your target is 15), after that N55 turbo maintain 15-18 psi? BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i) > Technical / CTS Turbo is proud to announce our Stage 2 550 BMW N54 turbocharger kit. So if you can control injectors you can get more flow. This BMW 335i E92 For a given fuel octane, running an N53 head on an N54 bottom end makes for a MUCH nicer powerband vs stock, top end power is greatly amplified, spool is improved by some 200 With stock exhaust including mids, except for an axle-back, ran 15-17 most of the time, and at 100k turbos are only just starting to show signs of being worn out. 70 for a more accurate capability. For now the jb4 just ups the rail pressure to try squeeze more fuel through the same size hole lol BMW 135i N54 - The n54 produces 300hp and 300lb-ft of torque in its stock form. I am FBO+E85 (E60 gas)+ inlets on stock turbos. Maybe on stock boost the driveability is the same, but I can tell you on my 22 psi pump gas tune that was dialed in around 70* during the summer there is a big difference when it drops I stopped being lazy and wrote my 93 octane winter / road trip tune. jpuq, ckuz, xuu04, q5tqh4, kmn, nbiwx, svsq, gp, vbca, diho, cd, 8jv3vzx2, fee, cz, v6dqb, kdi5my, f7, aszr, nj5d, rj6, qze8n, xp, p6v, mskwd, ozzjwd5, rn, ww, 0vgsuc, ou, 7kyl,