I own a 95' 5 spd. 4x extended cab long box w/257,000 miles. It currently came w/a 100 plate and just straight 3". I put a TST boost elbow on it and just recently gauges.

Two issues.
1) I know a stock turbo should run around 18-20 psi. As of right now I can only hit 19 before havaing to back out of it due to EGT (issue 2). I was figuring with the boost elbow to reach at least a little bit more. To trouble shoot it I first pinched the line going to my wastegate and drove it...no difference. I then took off the line going to the wastegate and plugged the hole in the turbo. Still no difference at all. If I did that the turbo should have been making much more boost correct?

My Wastegate does have an adjustable arm on it that I haven't played with. I did unhook that and the gate moves very easily and freely and the plunger moves (very very stiffley?) Did this to ensure it wasn't stuck open. Could it be broke still and flopping around in there?

I don't believe I have any boost leaks anywhere also...

2) High EGT's. My starwheel is cranked up and the combination of the plate I was expecting kind of high EGT's. But I can peg my gauge at 1600 if I wanted to. It gets to 1400 before I'm even out of 4th. Normal/should I worry much right now or just watch the temps?

Any information, help or trouble-shooting tips would be greatly appreciated guys!!! I'm fresh outta ideas and don't want to go any further with mods until I get this under control for it might be pointless. Thanks.

 

one of your major problems is that restrictive 3 inch exhaust. that ole pig needs to breathe!!! you'll notice a huge difference if you replace it with a 4 inch system. might want to get yourself a different air intake too. the stocker isn't the most efficient... you can get a bhaf from napa for around 60 bucks or you can get a real cold air intake. those two things alone will help you alot. ur dumpin quite a bit of fuel n not gettin enough air and welcome to diesel bombers

 

Forgot about that...I do have a huge non-restrictive filter on it and as for the exhaust its next on the list when the dollars roll around. Thinking 4" downpipe and 5" out.

 

yep thats the same thing i got. you can get the 4" downpipe at napa for like 100 bucks, and i went to the local tractor trailer parts store n got a couple feet of 5 inch pipe n a 90* n made my own single stack. now im lookin for the piece that goes over the rear axle so i can get rid of the stack. wayyyy to much drone in the cab when ur drivin 500 miles a week

 

welcome to diesel bombers
u might want to back off on the star wheel, and see if that helps with the egts, but you shuld beable to get more boost than that b4 you peg the pyro, is the turbo in good condition? another thing check the smoke screw on the back off the afc, see if someone gutted the afc

 

i would look for leaks some were ... cuz with my 95 stock with plugged waste gate when i got it i could hit 25 easy with no problems and it was still climbing but i would back off cuz cops around here are prety antsy to pull some one over ... and didnt help that i was runnin down pipe only .... ... he wanted to keep his exhaust and i didnt care cuz trucks gettin striped and rebuild any ways

 

Was that 4" down pipe something napa had in stock or did they order it for you. thanks.

 

you can build a downpipe to just get some pipe and a plow disc cut the outside for the bigger pipe and adapt to the smaller pipe not far from the turbo.

 

they had to order it. but it didnt take long to get there, a lot less time than it takes to order it online, ups to get it n then find my house

 

can anyone help i have a 95 cummins auto fully built trans,stg10 fuel plate ff,stg 2 ddp injectors,custom intake,4 inch exhaust,boost elbow turned all the way in and im only hitting 28 psi ??? is that about right ??? also i installed the boost elbow on the compressor housing is that in the right spot???