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On my Edge Insight CTS, I updated it the other day and now it will monitor "Variable Geometry Turbo Charger Duty Cycle %". When I wasn't having issues with my truck, it would stay right at 85% at idle and at 0 throttle, and then when driving, depending on pedal position it would go down as low as the high 60s during normal driving. I never tested to see where it would go getting on it or at WOT. But here lately my truck has been having some MAF sensor issues and when I first crank my truck up in the morning it will start at about 78% and slowly creep up until it stops at 85%, and then it will drop like a rock with the least bit of throttle. Then once I drive it a few hundred yards it will stay at about 50-something percent with no throttle, and when I press the throttle it will drop down to 15%. After about a mile it won't budge off of 15% no matter where the throttle is or what gear the truck is in.
So can someone explain to me what a high percentage would mean and what a low percentage would mean?
__________________ 03 6.0L F250 Lariat FX4 Crew Cab
SCT X3 w/ GearHead Tunes; Liberator EGR Delete; 4" Strait Pipe from the the cat back (muffler & cat delete); High Idle Mod; Tank Harpoon; Fog Light Mod; King Ranch side steps w/ lights
Andy, I'm studing about vgt duty cycles. What I've found thus far is. Vgtdc should be 85% at wot, 43% at idel, 0 at koeo. I don't know if I understand this part so bare w/ me and if it wrong please somebody correct me. If vgtdc is measured by volts you actually have 0-100% dc and that would be wot and somewhere around 28psi I can't remember the volts but 100% or 85% if using a percentage. The thing about this though there is no feed to the pcm that actually tells it what position the vanes are in. I can't figure out how the dc is measured and what it actual means to us monitoring it. It appears just as useless as engine load, m.a.p, and intake temp along w/ a few others.
I forgot to mention that I see the same results that you do. At wot I'm seeing 4?% @ 20-22 psi boost. Maybe you'll have to get it to 28 psi to get 85% dc.
Andy, I'm studing about vgt duty cycles. What I've found thus far is. Vgtdc should be 85% at wot, 43% at idel, 0 at koeo. I don't know if I understand this part so bare w/ me and if it wrong please somebody correct me. If vgtdc is measured by volts you actually have 0-100% dc and that would be wot and somewhere around 28psi I can't remember the volts but 100% or 85% if using a percentage. The thing about this though there is no feed to the pcm that actually tells it what position the vanes are in. I can't figure out how the dc is measured and what it actual means to us monitoring it. It appears just as useless as engine load, m.a.p, and intake temp along w/ a few others.
I forgot to mention that I see the same results that you do. At wot I'm seeing 4?% @ 20-22 psi boost. Maybe you'll have to get it to 28 psi to get 85% dc.
See I'm trying to figure out if I may have a bad VGT solenoid or if the issues I'm having with my MAF sensor is causing this...but here's what mine is doing:
When I first crank the truck up, it's at 85%. Then I press the throttle as I normally would taking off out of the driveway and it drops straight to 36.5%. Then I let off the throttle to coast a little ways and the highest it will go is 48.4%. Then I press the throttle again and it drops to 15%. Then I let off again to coast and the highest it will go is 34.1%. Then I press the throttle again and it drops to 15% again and won't budge from there. But no matter what percentage it reads, my truck has 0 power, it sounds totally different from the time I start it up, and every bit of boost it builts gets "farted" out of the air box as soon as I let off the throttle.
Needless to say this truck is quickly starting to **** me off in a big way.
__________________ 03 6.0L F250 Lariat FX4 Crew Cab
SCT X3 w/ GearHead Tunes; Liberator EGR Delete; 4" Strait Pipe from the the cat back (muffler & cat delete); High Idle Mod; Tank Harpoon; Fog Light Mod; King Ranch side steps w/ lights
the vgt duty cycle has a high duty cycle at idel and a low duty cycle at high boost when the veins are pushed out
heres the operating value
VGTDC # 0 73 43 0 - 100 PERCENT Turbo Duty Cycle
this is from koeo =0%-low idel[628rpm] =73%-high idel[2500rpm] =43%
the vgt silinoid controls the turbo veins this is how I can kinda tell what position veins are at
Ok, so since you know about my other issues, do you think they are causing my screwy VGT duty cycles or do you think I should try out a different VGT solenoid?
__________________ 03 6.0L F250 Lariat FX4 Crew Cab
SCT X3 w/ GearHead Tunes; Liberator EGR Delete; 4" Strait Pipe from the the cat back (muffler & cat delete); High Idle Mod; Tank Harpoon; Fog Light Mod; King Ranch side steps w/ lights
you have 2 options....
do the old school boost test this should give you an idea if the vgt is working.
or take it back to Bill H.
__________________
Former Ford Senior master tech, gas and diesel.1992-2012
ASE Master Tech, L1 certified.
2006 f250 cc swb fx4 6.0
mods arp,egr delete, tuned, 91 gallon RDS fuel tank.
active command vgt to 85%, egrdc# to 0 and rpm to 1200. moniter mgp.
should see 1.75+mgp but depeneding on eot.
next work egr and vgt one at a time, look and listen fir a change.
__________________
Former Ford Senior master tech, gas and diesel.1992-2012
ASE Master Tech, L1 certified.
2006 f250 cc swb fx4 6.0
mods arp,egr delete, tuned, 91 gallon RDS fuel tank.
I'll try anything before I have to take it to any of these Bill H wanna-be's I live around.
Sound's as though Bill H woulda been a better option than who you've been dealing with! lol I am just saying, you have alot of problem's with your current mechanic's!
On my Edge Insight CTS, I updated it the other day and now it will monitor "Variable Geometry Turbo Charger Duty Cycle %". When I wasn't having issues with my truck, it would stay right at 85% at idle and at 0 throttle, and then when driving, depending on pedal position it would go down as low as the high 60s during normal driving. I never tested to see where it would go getting on it or at WOT. But here lately my truck has been having some MAF sensor issues and when I first crank my truck up in the morning it will start at about 78% and slowly creep up until it stops at 85%, and then it will drop like a rock with the least bit of throttle. Then once I drive it a few hundred yards it will stay at about 50-something percent with no throttle, and when I press the throttle it will drop down to 15%. After about a mile it won't budge off of 15% no matter where the throttle is or what gear the truck is in.
So can someone explain to me what a high percentage would mean and what a low percentage would mean?
it's funny to see this post because I posted problem close to this on a another board. I wasn't even thinking the MAF sensor I was leaning towards the EBP or VGT.
it's funny to see this post because I posted problem close to this on a another board. I wasn't even thinking the MAF sensor I was leaning towards the EBP or VGT.
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