Quote:
Originally Posted by kern417
Time to keep beating a dead horse. I just saw another post where BM3 claims that stage 2 is +1.5psi from stage 1. Has anyone seen their stage 2 logs target 18psi? And has anyone that has the same 16.5psi target, reached out to PTF support to see why the boost is low?
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I've gone back through this thread and looked at BM3 Stage 1 vs BM3 Stage 2 data logs and I agree with you, no difference between the tunes.
Boost Target and Load Target, both have boost target of 16.5 PSI across the board and ask for Load of 190 at 3500 RPM and then 170 from 4000 RPM and 165 from 5000 RPM.
Both versions experience the boost spike between 3200 - 3500 RPM (coinciding with the Load Target of 190), although the Stage 1 seems to spike a bit later at around 3500 RPM and about 18.7 PSI and Stage 2 about 3200 RPM at about 19.8 PSI This may be due to DP or Timing/Fueling variations. Lower timing/more fuel at spool up can generate boost earlier.
Based on the data you'd have to question the need and expense (if there is any extra cost) for upgrading from Stage 1 to Stage 2.