no it does not flucuate. i checked lines and no visual leaks. you know now that I think about it when i feel the de-rate in the last two gears it acually falls off well before it gets near 30 psi, it is a very noticable power loss a little before 20 psi. when the power falls off it will still pull and the boost will run up to around 35 psi max. but I can feel it when I shift gears and get on it it goes like this.. shift, then throttle....wait for turbo to spool and when it does get to about 20 psi Bam! derate.
c15 at 525 setting is still weak to me. help please
Discussion in 'Trucks [ Eighteen Wheelers ]' started by walton379, Nov 22, 2008.
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I forgot to tell ya mine would always do this in high elevations under load, even though i didnt see over 28psi the ecm would de rate the motor, CAT told me that the pressure differences are screwing wit the boost valve and i need to "update it"
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