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      11-15-2019, 06:07 AM   #168
kern417
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Drives: 2018 440i |2016 340i | 2010 X5
Join Date: Aug 2016
Location: Cincinnati

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Quote:
Originally Posted by OzBMR View Post
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.
Thanks for the feedback. Mine doesn't spike at all on 93 or E30. I also feel like downpipes are reducing the car's ability to control boost effectively, and that's why people experience throttle closures and torque spikes on stage 2.

I do have a couple stage 1 test maps that they sent me back in the day, i think they targetted 19-20psi on stage 1. It felt fast as hell but was still in their beta stages so I didn't feel comfortable running it long term.
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Quote:
Originally Posted by umizoomi View Post
As long as 3-pedals are an option, I will exercise my right to suffer the handicap and indignity of slower shifts and reaction times.
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