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Old 01-07-2009, 07:48 PM   #1
Scooby Newbie
Member#: 12845
Join Date: Nov 2001
Chapter/Region: RMIC
Location: Denver, CO
2008 BMW 335xi
Sparkling Graphite

Default Crazy idea? Raise target boost compensation as temp goes down instead of lower?

I have noticed in almost every map that boost compensation is negative as temperature goes down. I get that it's easier to make boost, so you would want to lower it to adjust accordingly. However, in my logs, when the temp is lower and the compensation I have set hits my boost target in all temperatures, it is harder to hit target boost because it's is coming on sooner, which overshoots the target at lower RPMs, causing it to pull wgdc and underboost. Seems like relatively the target is now lower since I'm compensating negatively. Or, if the target is exactly the same, it is either late coming on boost when it's warmer, and it overshoots it when it's colder regardless of my compensation.

So I was thinking, since I don't mind if it hits a slightly higher boost when it's cold (maybe not do any positive timing correction with colder air and just leave that at 0), would it make sense to let the boost target go up slightly as temps go down, so that at lower rpms it's not as likely to overshoot the target and pull wgdc through turbo dynamics?

I could then adjust wgdc down some as well, which will make it easier to keep boost under control.

Does this make any sense?

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