Quote:
Originally Posted by Coheed
I don't think it will be an issue with lower boost setups. But PR can have a drastic impact on the power delivery and output of the system. Remember with higher PR comes higher temps, lower efficiency. The lower compressor efficiency increases the amount of drive force the turbine requires, increasing backpressure. Increased backpressure reduces volumetric efficiency and is detrimental to scavenging, this increases pumping losses.
I've seen turbo setups make 30-50whp more just by going to sea level. And it isn't just because of boost. A lot of these turbo setups utilized Absolute pressure for the boost controller. The system as a whole simply maxes out faster with elevation.
The JR system shouldn't have too many issues with running at higher altitude. But with the system so close to max output in stock form, it will probably be closer to maxed out at 4500ft.
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You're correct it's not just about being able to hit boost target, but I maintain that f you're seeing you're turbo fall out of its efficiency rage (especially at low boost) due to an altitude change, you simply picked the wrong turbo. Also, as I a stated above it's really a moot point since no one even makes a kit for this car with a turbo small (or maxed out at reasonable boost) enough to warrant this concern.