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Anybody have any thoughts as to what is causing it to flatten out so much above 5k rpm?
Comparing this to a stock RB dyno chart has me a little puzzled
Hard to tell without looking at A/F ratio, etc.
But what turbo??? Boost level drops off a little bit towards high rpm, so would think turbo running out of puff or a intake airleak of some kind. Could be octane of fuel as well (low octane), hence tuner might have pulled ignition timing at peak boost to stop engine knocking.
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