Posted by Brendon-KS on September 19, 2017 at 17:47:57 from (63.245.145.35):
In Reply to: Re: ???????? posted by Guido on September 19, 2017 at 15:30:38:
I've always believed that power loss in turbo engines didn't follow the same rule of thumb that naturally aspirated engines do. If the turbo is set up to maintain absolute pressure there should be no power loss since you'd be stuffing in the same amount of air. This assumes the turbo could spin fast enough to accomplish this. However, if it maintains relative (or gauge) pressure that is referenced to the atmospheric pressure there will be a loss. Even in this case, though, the percentage of total intake pressure lost will be a lower percentage than with a naturally aspirated engine since the reduction in atmospheric pressure will be a lower percentage of the total. For example, the loss of 2 psi from 14 psi at low elevation to 12 psi higher up is a greater percentage of pressure (and power) lost than if running 10 psi of relative boost giving 24 psi and 22 psi, respectively. I easily could be wrong in my understanding, though.
Makes me think of the first car I owned - a 1986 Buick Skyhawk T-Type with a turbocharged 1.8L engine. (Only years later have I learned how rare that car was - I should have hung on to it!) At my home in southeast Colorado (around 4000 ft) the boost pressure gauge would top out around 12-13 psi but in the mountains it would struggle to get to even 10 psi with a noticable power reduction. At 1500 ft in Kansas it would peg the 15 psi gauge which resulted in audible pinging unless I used high octane fuel. I figured that the little turbocharger simply couldn't spin fast enough to maintain even relative pressure at high altitudes.
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