Quote:
Originally Posted by weehe126
Very interested in this statement. I've seen people get 19-21psi on the stock turbo on E blends. Have you seen a log where someone ran this much boost on 93, even with 0 timing? How does increased rail pressure, when you aren't already low on rail pressure, help allow more timing/boost on 93?
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I ran a DervTech flash tune mid-2019 for a short time, on straight 93 it was very poor. It ran a lot of boost, 20 - 22 PSI from 3200 - 6000 RPM then tapered. Timing was low single digits at best, about 390 WHP even at 93 with ethanol added to E12. Best quarter with that set up was 11.8@118mph with Hoosier drag radials and 1.8 60ft (M140i RWD)
They didn't touch the stock timing maps and the DME just pulled heaps of timing due to the lack of octane.
https://f30.bimmerpost.com/forums/sh...&postcount=104
Greater fuel flow wouldn't have helped with straight 93 octane. The only thing that helped was less boost and more octane via ethanol within the limits of the HPFP.
On 93 octane only and stock turbo the stock fuel pump is more than enough to find the octane limit of the fuel - about 400 WHP/ 450 HP engine is all you can hope for.