Originally Posted by '94IDITurbo7.3

now that i have a pyro i decided to try turning up my feul. i took the cover off of the IP then found the fuel screw. it would not turn by hand. so i got some vice grips. i "think" i turned the screw 1 flat max. i test drove and noticed no difference. egt's were the same, maxed out at 850-900*. boost maxes out at 5psi. both of those max numbers happen once i get to about 65-70mph. taking off from a stop civilized i see 3psi and 700*.

how quickly does your egt's and boost numbers rise?

Originally Posted by '94IDITurbo7.3

ok, so i plugged my wg hose with a bolt and wired the wg arm shut so it would not open. that actually lowered my max boost. i now max out at 4psi. it climbs good to 4 then it WILL NOT get any higher, yet my egt's continue to climb. the only way to hit 4 psi is to go WOT from a near stand still.

i am mystified by how plugging my wg would lower max boost.

Originally Posted by '94IDITurbo7.3

i put a tight fitting bolt in the hose between the comp housing and wg actuator. i also clamped it with a hose clamp. and i tied some wire around were the wg bolts to the comp housing to the linkage on the exhaust housing so the wg would not flop open by itself.

i took the bolt back out and hooked it everything back up.

the fitting on the comp housing for the wg was a little loose. i tightened that. i also used some of me exhaust sealant to seal were the comp outlet goes into the intake snail. those two things did not change anything.


i do know that i did turn the fuel up do to the fact that i can now roll coal. it did not effect egt's at all though.

Originally Posted by '94IDITurbo7.3

ok so i tested my boost gauge.

my boost gauge is consistantly reading 5psi less than what i have my air comp regulated to. so a/c set to 20psi, my boost gauge reads 15psi.

so this is telling me that when driving and my gauge reads 5psi i am really pushing 10psi? under normal acceleration my gauge reads 2-3psi so this would really be 7-8psi.

not sure how the gauge could be messed up since it is mechanical so it sounds like the line is kinked/pinched some where.

the odd thing though is last fall when i had my sunpro gauge set up as my boost gauge i was getting the same readings. that had a straight shot for the boost tube between the turbo and the gauge.:dunno

also i turned my fuel up half a flat from the way it came when it was rebuilt and it gave me a CONSIDERABLE more amt of black smoke. it's like i increased fuel but the boost did not increase resulting in not enough air.:dunno


also if all ^^^^^ is correct how would plugging the wg lower my WOT boost and not make a difference in normal acceleration boost?

Originally Posted by '94IDITurbo7.3

i tested my other boost gauge and got the same results. so nothing is wrong with my glow shift gauge or the tubing.

Originally Posted by '94IDITurbo7.3

i decided to see if the muffler was causing issues. i took the intermediate pipe off again an went for a drive with just the dp. that did not do enough to warrant a new muffler or deleting the muffler.

would i be able the take the exhaust elbow(thing the dp connects to) off of the turbo and use a mirror to look at the exhaust wheel.

Originally Posted by 91dirtydiesel

where is your reading coming from?
your 100% positive you have no leaks in the intake/exhaust?
no leaks at the fitting on the boost gauge?
do you have any trailers or big hills near by?
my fuel screw was mighty tight as well but once it got turning seemed to ease up. dont think 1 flat would make a huge difference
whats your timing set at?
have you ever taken your turbo off?
hows your air filter?

Originally Posted by '94IDITurbo7.3

no idea on the timing. it is advanced 2 dimes widths from the marks, but no actual numbers.

Originally Posted by 91dirtydiesel

are you using the skinny 1/8" plastic style tube? might try running a different set up with the larger vacuum or fuel rubber hose, just to see if the line is causing any issues.

if your smoking to much with one flat then you defiantly dont have enough air going through there, does the impeller spin free? maybe even try a cone filter set up

does your CDR leave oil residue on your intake/turbo? if so then you should be able to use a flashlight and mirror and see the back of the snail, you might even find some oil drips coming from it

ive heard on GAS motors if you have an intake leak and you spray some carb cleaner or brake cleaner around the intake gasket if it changes the idle then you found your problem....IM NOT SURE IF THAT WILL WORK ON DIESELS so dont try it unless you find out for sure

Originally Posted by FORDF250HDXLT

no boost until 2500 rpm.....no way i could live with that.id just run n/a lol.
did you upgrade to the banks DP yet?
when was the ip/injectors replaced?
how many miles on the turbo?

try retarding the timing one dimes width.

Originally Posted by typefour

Your turbine wheel tips are melted off.or the turbo isnt spinning freely. Seen 4 of the last 6 I rebuilt with melted wheels.
pm me if you would like a rebuild on yours