Quote:
Originally Posted by speedyman
^^^^^^This, exactly. Sucks as I would much rather have a true ECM flash. I'll probably give one of these piggy backs a try but just have concerns about the lean conditions that I've seen in these logs.
I read through a few threads about JB4s on another forum and some of the guys claim to have some serious SOTP improvements in M5s and M550is.
How much boost do you think these motors can handle and stay in one piece for say 50,000 miles? My prior experience is with supercharged Ford V8s with Zoeler forged pistons, forged crankshafts, Manley 4340 rods. Going from 8 lbs to say 14 on those 4.6L motors was a profound increase in performance as in going from 13 second 1/4 miles to mid 11s.
I'm nowhere near the break in point on my '21 M50i and have not run it anywhere near redline but am seriously impressed with the stock power and that is here in the SW FL severe heat and very high humidity none of which are favorable to FI engines.
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The motor has proven strong over the years despite some of its oil burning issues over the years. I haven't seen that on the R, but we shall see. The fuel system seems to be having zero issues based on the logs Tim posted. AFR stays north of 14.5 right to redline, so we have plenty of headroom.
My only concern is the timing drops showing up in Tim's logs. I also am not sure why he is seeing 22 lbs of boost when the map he is running should only target 18?