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Old 08-30-2006, 03:52 PM   #34
Freon
Scooby Specialist
 
Member#: 88322
Join Date: Jun 2005
Chapter/Region: MWSOC
Location: Indianapolis, IN
Vehicle:
2009 BMW 135i

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Quote:
Originally Posted by happasaiyan View Post
...but with avcs really helping the turbo spool,
Looking at USDM/EU vs. JDM, there are two possibilities. #1, this statement is a misnomer, and it can help power up top as well, not just spool. OR, the EU/USDM cars have different cam duration/lift/advance at rest, which leads to different mapping. Perhaps the USDM car cams start out with more advance, thus not needing any in upper rpm range. Maybe it isn't even emissions.

I had always assumed you'd want to retard the cams at high load due to exhaust backpressure, but looking at the JDM maps makes me question this. I actually hadn't looked at the JDM maps until today when I ripped them and posted them.
Quote:
why are the lower (load and rpm) range cells also drastically different?
Different turbos, cams, gearing? Though I agree they're still all over the place, and don't seem to make much sense at a glance.

Look the 06WRX and 04STI. Airpump? Turbo? Very odd maps to compare.
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