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Old 03-05-2004, 09:39 PM   #3
Scooby Specialist
Member#: 874
Join Date: Feb 2000
Chapter/Region: RMIC
Location: Colorado Mountains
2004 STi
16 MX-5 Club


Jeff -

Atmospheric pressure here is around 80-85% of sea level. Given that your IDCs were ~70% at sea level, fuel is definately not going to be your problem.

I don't have the compressor map for the VF 30, but 1.25 bar at this altitude may be pushing a pressure ratio that is outside that turbo's peak efficiency. That turbo is working a good deal harder to push 1.25 bar up here that is is pushing 1.15 bar at sea level.

Check out :

If you dig around the forum, I think you'll find the compressor map for the VF30.

Good luck with the problem. You may have to get a re-map for your mods & higher altitude.
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