Quote:
Originally Posted by ajsalida
Yep, I routinely see 17.9 PSI indicated on stage 1 Cobb at low RPM at my elevation (~8k-12k). This puzzled me for a while, but then i realized what maps that target load meant. Essentially they target absolute manifold pressure, not some delta PSI above ambient. So if ambient is low due to elevation then turbos work a bit harder to hit it. They don't push any more air mass than at low elevation, but a larger portion of it needs to be compressed, ergo better FMIC is a real good idea.
I did not understand this before I bought the Cobb but I am glad it works that way.
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Do you know what PSI you were seeing stock? I've been under the impression that at 5K feet the the full compensation that the stock programming delivers is less than the max it can do - in other words, that you see about 10.5psi and max occurs more around 8K feet?
Still have yet to meet anyone that has measured and volunteered boost numbers stock in Denver...