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      11-26-2020, 03:13 PM   #28
LongBeachDinanFan
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Drives: M3
Join Date: Jan 2015
Location: LB, CA

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Quote:
Originally Posted by edwarjejeega View Post
JB4 only is terrible and inconsistent. The car will go from being a monster to running worse times than stock
I ran one on my M3 for a few years and never had a single issue, was always consistently fast. It probably depends on what maps you use, what settings you use, whether the JB4 itself is going to safety map to try to correct a tuning issue, and those sorts of details. You just post up a JB4 log of it running fast and another log of it running slow if you have that issue and they can tell you why and how to fix it.
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