Setup is as follows
6765 billet t4 divided
dual v44 wastegates with 13psi springs
blox boost controller
Problem is that the car continues to build boost past 13psi until it hits boost cut at 15psi. Not sure how high the pressure will gol but i definitely dont wanna try. I thought it might be the boost controller being picky with the 2 wastegates so i bypassed it. Didnt make a difference at all. Is it common when running dual wastegates for the actual boost pressure to be higher than the spring pressure

 

you should have great control with 2 44mm gates. id check your springs in the gates and also make sure you have your correct vacuum port on the wgs. also if its a mvr make sure you have any unused vacuum ports on the bottom plugged up

 

what manifold, could be bad placement.

i had twin 38s mvs on a FR manifold that never ran into problems, even with boost under 10 psi

 

First check that the vacuum lines are hooked up correctly. For now, I would just run the lines from the manifold to the bottom of the gate. Leave the boost controller out of the equation until its working as it should. My money is on the WG springs. Thats a big enough turbo that the "patch of least resistance" for the exhaust is probably through the turbine wheel, not out the gate. Put a much lighter spring in them, especially if you only want 13psi from a 6765 T4

 

Yea i already unhooked the boost controller because that was my first thought why it would be doing that. The 2 vacuum lines from the bottom of the wastegates tee together and then go directly to the nipple on the compressor of the turbo. Wastegate placement on the manifold looks good. They connect right by the merge collector on each side of the manifold so i doubt its that. And yes im definitely planning on running more than 13lb of boost but i want to start at a lower boost pressure to get the majority of my tuning done. Then I was going to start cranking the boost after i felt it was safe. I guess i could turn the boost cut a lil higher and see if it stops at maybe 16 or 17lb but if not ill probably have to try lower springs in the wastegate :/

 

wg design plays a huge role. my wg port "looks" right as well, in fact its a mimic of FR's design, and i still creep about 4 psi past the spring.

 

Yea thats true. Hopefully its the same in my case because i'm about to raise boost cut to 17psi and see if it stays below that. I definitely don't want boost any higher for the beginning part of my tuning. Its gonna suck getting those wastegates off and swapping springs again if it comes down to it

 

arent' you using a BC? just use that to limit the creeping

 

I've never had any luck with boost control using the nipple on the turbo. Try running it to the manifold.

 

Using the boost controller would just raise the boost. Im gonna try and raise boost cut a little bit tommorow

 

you could try setting boost cut at 20, and seeing if it starts to hold before that.

 

no, the BC can raise and lower boost

 

The boost controller can raise and lower the boost, but only above the wastegate spring pressure. I have a 13psi spring so no matter how much I turn down boost with the boost controller, it can't go lower than 13psi. Yea i've been lazy but im gonna raise boost cut once i take the time to do it. Work sucks

 

oh, didn't realize you were trying to go under the spring pressure. why on earth are you running a 13 lb spring if 15 psi is too high for you? lol

 

Show us your wastegate placements on the manifold.

 

Never mind man I already explained myself. We must of got each other confused

 

Also, I raised boost cut to 18psi and it still hit it

 

Oh damn! Your trying to get the exhaust to do a sharp 180degree turn then a 90degree turn out the gates. I bet this is your problem!

What brand is it?just curious...

 

Its from a company called forged performance. Ive seen a lot of other manifolds with a 90 degree for the wastegate before though. I just ordered 2 new springs for the wastegates so maybe that will solve the issue. In the meantime im gonna do a boost leak test and see if that looks ok. Im also using the vibrant/synapse boost connect kit so i doubt i have a leak in the line.

 

you still shouldnt have a problem... i think you have the wrong springs

 

Man, I'll be interested to see if TiAL pipes in here, those WG exits look far less than optimal to me. I have one like that on my manifold and it creeps like mad. I thought another one would fix it, but maybe not...

 

double check the springs. don't count out those vibrant boost connect lines/fittings yet. do a boost leak test i've seen them get hot and fail just after a few pulls on the dyno. One other thing to check which I hardly see often is make sure the compressor housing is completely sealed on the turbo. i've seen the oring rip inside and it will overboost everytime.

 

That is some serioud bends that the exhaust has to make to get into the gates man. Good luck on the new springs.

 

Could you elaborate on this a little please?

 

i'm with the others, that wg placement looks.. really bad. on my manifold and every other good manifold i've seen, the wg ports are basically flipped 180* from where yours is placed.

mine still creeps a few psi, so it goes to show just how crucial *perfect* wg design is in preventing creep. i can definitely imagine that thing creeping quite a few psi past what mine do