10-29-2012, 08:31 PM
Join Date: Mar 2007
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Turbo going bad? Losing Boost
2003 Ford F-350
Sct Livewire, W/Matt's SRL
Fass Pump @ 60lbs
A-Pillar gauges fuel/boost/pyro
Truck has been losing boost over the last year, used to spool like 25 pounds....down to 21, then 18, 13 now at WOT I am only spolling like 10-11 lbs. The truck is not laggy, from down low, just seems like it hits a wall where it runs out of air and am wondering if the turbo bearings are going to hell and not allwoing it to spin as it should. I don't know if the unison ring is not moving all the way, but I know it is some for sure.
On the way home did a little run, 20-75 stabbing the throttle and on hit 11 pounds then dropped down to 10 on A-pillar (SCT read out 1 psi less at all times), and also hit roughly 1350 EGTs, which is another reason I believe it is starving for air and has the fuel it needs
I have recently pulled the EGR Valve and cleaned it up fairly well, wasn't as bad as I thought it would be...(even though I believe it is turned off in SCT). I also tried unplugging VGT plug and can tell that there is a big difference.
Any way to check turbo bearings?
Or any other solutions/problems you guys can think of?