2003, Powermax turbo, VGT relearn and custom programming
I have searched up and down and have not been able to find the answer to my question so I thought I would post here.
I have replaced my old turbo (stock original 2003 turbo, which was crapping out) with a new Garrett Powermax turbo. The old one was never boosting off the line that well but I was attributing that to the vanes (took it appart and cleaned them but I think they were messed up for so long before I got the truck that it mostly killed the solenoid). The truck always had a reasonable top end which I have since learned was probably from an existing program and not a factory tune.
My question would be, I would like to have the VGT relearn run on it (I have looked it up and tried it several times but it doesn't appear to be cycling the turbo at all) to get the bottom end back. With the non-factory tune though I am unsure what the bottom end should feel like. Should I get the truck flashed back to stock at the dealer and try the relearn again?? Also, would my EGR delete be messing with the trucks ability to relearn the VGT sweep? I was reading in one post on powerstoke that was saying if there were any issues in the system it wouldn't do the relearn (could the EGR codes on my 03 be causing this?).
on a side note, when the turbo does spool up it sounds good...I just don't have that '03 sound at idle.
Additional question, can I get an SCT and just program it over top of the existing program or do I need to start with a stock base program before it will let me?