ok so i installed a sunpro boost gauge in my truck, and i don't know if its working properly,
let me start from the beginning, i installed the gauge into the hole in the top of the plenum
after the install i went to try and boost the turbo up a little and like a dumb@#$ i broke the shaft trying to take the end off so i could run a tap through it, and well it snapped, well it was like 11:00 and all the parts stores are closed and i need the truck to get to and from everyday
so i racked my brain and came up with a idea, being into carb engines before i had a set of air breather stud and extenders os i took the 2 pieces and retreaded the stud to 1/4-20
same a a breather stud and installed the extender, before screwing the extender on i measured the in tire shaft holding it together at the break and it measured 5 1/4 in form the mount to the end with the part that attaches to the turbo still on it i screwed the 2 together until it i was at that length then i drove the truck down the hwy the gauge read 6lb the highest it got and at 70 it read 2lb, but it felt like i had more power than before i messed with it, but i pulled it into the shop and proceeded to make the shaft shorter i did this 3 different time until now the shaft has a total length of 5in and my gauge reads at the most 8lbs and that's me running it hard as hell, and only 4 lbs when just running down the interstate at 70, i am just wondering if the gauge is working properly, i know from seeing other post that on ave, 3threads is 1lb of boost but i have taken 1/4in out and only got 2lb
if someone knows the factory measurement of the shaft so i could get a general idea how long it was at originally. or if someones rod is somewhere around 5in mount to end could tell me how much boost they are running that would help to, i just really don't want to run over 12lb
also if it at all matters the gauge that i got is a vac/boost gauge and there is no vac on it at all, i figure this could be because the intake and filter that are on it, filter is rated at 1100cfm, and another note when just idling the gauge reads 0 but you can hear the turbo whine over the engine in the cab, any help will be greatly appreciated

 

you arnt seeing vaccume because there is no throttle plate. so you dont see a spike in vaccume, the engine never scavenges for air like an old gasser with the butterflies slammed shut. not the best gauge but if it reads 0 when the engine is off then chances are its in working order.

 

I'm going to order a triple gauge pod with bully dog gauges soon but for now it will have to work

---AutoMerged DoublePost---

Thanks for the advice its greatly appreciated

---AutoMerged DoublePost---

Today I pulled the heat wrap off my Turbo. On my Turbo it says Garrett a/r 70 is this the factory Turbo for this truck and I turned the waste gate up another 3 turns and my boost level is still not going up any idea but you can hear the Turbo over everything and through my exhaust is this all normal

 

couldnt tell you what your factory turbo is? is you rod holding open your wastegate? it could be opening to soon or even cracked open all the time making for very low boost numbers.

 

Which direction is open and close I would figure pulled shut pushed open

 

if this was on my dodge and adjusted the way i see in my head... i would disassemble the wastegate rod so that it is 2 pieces. at this point the gate will be closed unless it is damaged. get you a marker and hold the 2 pieces of rod side my side to determine how far you need to adjust the rods back together. you will want the wastegate rod ever so slightly pulling on the wastegate valve ensuring that it is seated and not hanging open.

i hope that makes sence

 

My rod is pulling on the waste gate a little more than slightly. There is probably open 3/8 in between where the gate is closed and the mount on the rod and about 7/16 difference between the total rod length and the gate full open I think I'm going to take the in tire thing off today and check and make sure the my gate is not damaged and I'm almost sure that I something is wrong I should be putting alot more boost than 9lbs full throtle and 4lbs at cruise the way it is set right now. Is there anyone that makes a after market gate actuator. For this set up

 

im sure someone does but i wouldnt know what direction to point you. do you have any boost leaks? blown boots or anything.

 

No should not be any leaks I don't have and boots or rubber joints after the Turbo
thanks for you input it helped alot