Wastegate or tune?
 

Hey quick ?... Truck in my sig, noticed lately at WOT it runs nice and smooth up to about 50 psi, then once it hits the 50 psi mark it bogs down and fluctuates a little. Boost drops to about 42 and fluctuates between 40-43 psi. Still WOT. Now this is with the EJWA on hot unlock lvl 6, or lvl 5. If I take it to lvl 1, it runs smooth up to 40 psi and stays smooth. Now obviously it'll make less boost with less fuel. Does it sound like the wastegate is opening at about 45-50 psi to you guys or does it sound like something different. Thought maybe the juice was defueling, on lvl 6 WOT I can break 1500 degrees egt, maxes out about 1550*. The max egt setting on the juice only goes to 1500, but I believe backdown is off. Help me think here. I like to think aloud. Thanks everyone

A quick easy way to tell is pich/block off the wastegate hose. You could also disconnect or pull your pyro probe out to see if that is the limiting factor.

Wastegate or tune?
 

True. I'll try both and see what happens. If it's the gate opening, the wastegate rod needs to be turned clockwise for more boost correct?

I guess that would depend on what type of thread the rod has. I have yet to see left hand thread on a wastegate actuator rod, only right hand. Clockwise will shorten the length of the rod.:tu:

are you running stock valve springs? ive heard of some pushing alot of boost such as yours, actually partially opening the intake valves allowing the boost to drop and flutter around.

Wastegate or tune?
 

I thought about that too. Yea they're stock. I should probably check my valve lashes anyway... The thing that made me think otherwise was because my 64/71/14 I had on there before ran 54psi without any problems at all.

that is true. I would try the easy stuff first and see where it gets ya

Stock 24v springs allow the intake valve to blow open at 50psi on the bench. This is a major problem and it is intensified as rpm increase. With high drive pressures your engine might even be experiencing reversion, when the exhaust valve blows open on the intake stroke contaminating the intake charge. Aftermarket retainers are needed on 24v engines that rev over 4,000rpm.

I can't see this situation with valve float. If it started at 45 psi, and got worse and worse up to 50, yes. My boost gauge fluctuates after 48psi and gets worse to 57. I am very confident my valves are starting to float, but his situation reeks off wastegate, or a backdown.

Ture,I'm also wouldering what his fuel pressure is a WOT. As I seen with the VP trucks with heavy mods. Below 17 psi (WOT) at the VP starts to loss HP on the DYNO.

I would have to agree. As long as my EJWA is reading correctly, I never see less then 18 PSI, but only on the initial stomp of the throttle.
Knowing fuel pressure would be handy for diagnosing.

Wastegate or tune?
 

Fuel pressure is 14 at WOT. I can't see that being an issue as these things are getting plenty of fuel at that psi/volume... Im just thinking, itll still run perfectly fine at 5psi, and thats why people blindly kill vp44's. They just dont know theres a problem because the truck is running fine at that psi. Also, my 64mm turbo like i said ran perfect at 54 psi and 14 psi FP. I didn't get the truck out today but I did go out and pinch the line off. I'll test it tomorrow. Hoping it's just the gate. Thanks for your input everyone it's appreciated. I'm planning on meth injection and hitting the dyno this summer, so I need to get it running right. I'd love to hit the 1/4 mile but I hate throwing locked shifts without a billet flex plate and input shaft... Didn't think i was gonna go this far when I built my trans. Oops.

Wastegate or tune?
 

Well looks like it's the wastegate like I thought. I havent had a place to run it WOT in overdrive yet but in 3rd it does 53 psi and stays nice and smooth. Pulls like a mofo. Thought id get more than 53 psi out of the compounds though with the WG blocked... I guess I'll try it in overdrive on the interstate later and see what it hits.

Ya let's see what she does on the freeway I'm interested. To no. I can hit around 50psi with my 64 in 3rd and almost 60 on the freeway in OD

Wastegate or tune?
 

Runs 57psi in overdrive. Seems like it's kinda doin the same thing though it hits 57 then bogs down a little and rests at 54 or so with fluctuation. Only in overdrive it's ok in third at the slightly lower boost psi. Just still doesn't feel crisp in overdrive at WOT still feels like soggy bread haha