To much boost...

Well i have recently installed a 6.0 in my truck and i am having overboost problems. My old setup on my 5.3 i was running a turbosmart 38mm mounted on the log header and vented to the atmosphere. It would run 8-9 pounds. When i put the 6.0 in i moved the wastegate to the crossover and dumped it into my exhaust. And for some reason now i am at 14+ pounds of boost. I have added a BOV on my new setup and eliminated the PCV valve. I also took the wastegate apart to reclocked it so the ports were facing upwards. Do i have to hook any lines up to my BOV?Its a 50mm wyntom. Does anyone have any ideas why i am making so much boost now?

Try taking your dump into your exhaust off and see what happens. It also could have to do with your lines being longer now that the wastegate is down on the crossover.

your wastegate needs to be after the crossover merges into the other manifold. it needs to have a vac/boost line hooked up as well does the bov . the bov wont cause overboost problems though the wg is your problem.

[QUOTE=04chase;417562]your wastegate needs to be after the crossover merges into the other manifold.[\QUOTE]

No it doesn't.

You're arguing with the owner of the quickest SSS in the world.

when using the wastegate on the crossover, try sizing your wastegate spring to a smaller size

just cause a spring is rated at XX amount of boost doesnt mean its going to make that amount. always size smaller then step up, remember its gotta be good to regulate the boost when only controlling one side of motor

and playboy....he may have the fastest SSS or ext cab but synergy built it

Quote:

---

Originally Posted by musky02

Well i have recently installed a 6.0 in my truck and i am having overboost problems. My old setup on my 5.3 i was running a turbosmart 38mm mounted on the log header and vented to the atmosphere. It would run 8-9 pounds. When i put the 6.0 in i moved the wastegate to the crossover and dumped it into my exhaust. And for some reason now i am at 14+ pounds of boost. I have added a BOV on my new setup and eliminated the PCV valve. I also took the wastegate apart to reclocked it so the ports were facing upwards. Do i have to hook any lines up to my BOV?Its a 50mm wyntom. Does anyone have any ideas why i am making so much boost now?

---

Going from a 5.3 to a 6.0 can change some things around. If it stables out the gate is opening, if it never does the gate might be stuck shut. There are 2 ports on the gate. One close to the body, (lower port) one farther away (hi port). Hi port should be open to atmosphere, (no plugged) used for boost controllers some times, the lower port should be connected to the intake or the turbos outlet. Seen both; both work.
The BOV needs to connected to your intake (post tbody).
Gates location is fine, been doing that for many years. Like others have said, change you spring out, and or vent the gate to atmosphere and see if the problem is fixed.

One other thing, check your link going to the gate, for leaks and or mushy hose. Long runs of cheapo vaccum line, the line will expand and change things around.

Or instead of doing all that other stuff, just get it retuned for 14lbs and voila!

Quote:

---

Originally Posted by ducky

Or instead of doing all that other stuff, just get it retuned for 14lbs and voila!

---

Smart man.....

Quote:

---

Originally Posted by Quik

and playboy....he may have the fastest SSS or ext cab but synergy built it

---

I don't think you caught my sarcasm.

Quote:

---

Originally Posted by pl4yboy

I don't think you caught my sarcasm.

---

I didn't either. Dick lol.

Quote:

---

Originally Posted by musky02

TOO much boost

---

What's that ^^^^^^^^ even suppose to mean? bahahaha tune and go! baby go! :woot1:

I have a 38mm hooked to the left side bank ONLY then dumped into the dp...with no piping.. its directly bolted to flanges so that the wastegated exhaust takes an "L" shaped path about 4" and dumps into the DP. I don't have any problems controlling boost except when spraying a 100 shot... then it wants to creep a few pounds. Most likely because the right side bank has no WG bleed off... But you shouldn't have any problems controlling only 10 psi off of the crossover pipe.

Im gonna vent to atmoshere and see what happens. Another thing i forgot to mention is my boost line to the wastegate is mounted about 5 inches after the turbo, Its just a fitting tapped into the cold side piping. could this be a problem?

Quote:

---

Originally Posted by musky02

Im gonna vent to atmoshere and see what happens. Another thing i forgot to mention is my boost line to the wastegate is mounted about 5 inches after the turbo, Its just a fitting tapped into the cold side piping. could this be a problem?

---

No, but I'd run it from the intake or as close as u can. Just gets a smoother boost reading w/o the surge. Like was said before. Downsize ur spring. 6.0 exhausts a lot more volume than a 5.3...

Where is a good place to order a new spring,and get it fast!?

eBay!

I am looking at springs right now,and wondering whats this inner and outer stuff? My gate had one spring in it. Do i want an inner or outer or middle??

Well,i vented to atmoshpere and put a tial 4 pound spring in it,and it still is going upwards of 14 to 18 pounds of boost,i could probly go higher but i let off. Im starting to think maybe a 38mm gate isent enough?? I have a stock 6.0 with a S400 borg 76mm. Also,i put air to the gate to see it it worked and it opens very smoothly. So i dont think my gate is screwed up.

38mm is plenty. If I remember right the line to the wg needs to be before the throttle body.

i always source my gates off the turbos, has never gave me an issue

i owuld however put a smaller spring in it

a 38mm can work but if not positioned correctly then its going to not control as needed. a Wastegate isnt something you should of skimped on to begin with however since you have it, find a smaller spring and go from there.

youre absolutely sure that the vacuum/boost reference lines are routed properly to the gate?? something just doesnt seem right to me...

Is it alright to have the wastegate mounted to a flex coupler off the crossover, or should it be mounted directly to the crossover?

Well i removed spring so wastegate would open right away and still upwards of 15 pounds! does this mean i need a bigger gate than a 38?? How big should i go?

are you saying with no spring in the gate [which means constantly open] your still over boosting? what is the postion of the gate? the gates exhaust is it routed back into downpipe or vented to atmosphere? if merged into DP is it on a angle or more of a 90*?

Quote:

---

Originally Posted by musky02

Well i removed spring so wastegate would open right away and still upwards of 15 pounds! does this mean i need a bigger gate than a 38?? How big should i go?

---

could the gate be on backwards??

I have the gate mounted to a 4in flex coupler and its at about a 45 degree angle flowing with the exhaust. I have vented to atmosphere, and into DP and i get same results. Its a bone stock 6.0 with a turbosmart 38mm ultra gate, and a borg warner 76mm. Im gonna take the wastegate completly off tomarow and see if it still builds boost. I am running out of ideas.

post some pics of how it all is right now

Can you even hear it opening? It will be plenty noticeable when it opens.

yeah my trucks turbo setup was built by synergy , and was changed a bit by me as well as the tune and pretty much every thing else on the truck , ill be building my own turbo setup soon but not on this truck . im happy with it and its staying together and also looks better than 99% of the stuff i see, but thats not the point or the point of this thread but always seems to be brought up everytime i post .

it could be a bad angle of exhaust routing bypassing flow that should be going into the wastegate, or the one bank that isnt wastgated is making enough flow to keep the turbo spooling . that can work but isnt ideal in a setup id build.

pics will help a ton as most have said .

single and dual springs can be combined to make different pressures. in your case you need to find the source of the problem if you have a very weak spring in it now.

Well i removed my wastegate completly and was still able to make around 9-10 pounds of boost. Here is a pic of my crossover. Will moving my wastegate to my manifold solve my problems?

Is the flex joint in tact on the inside clean shot all the way into the crossover.?

yea,no blockage. When the truck was idleing i put my hand in front of it and it seemed to be pushing alot of exhaust out.

Well,i spent the weekend redoing my wastegate setup,the gate is now right before the turbo so all cylinders are getting dumped out,and i was still able to make 15 pounds. What should i do next? Also another thing i forgot to mention is my turbo has the extended tip wheel, do those make more boost then the standard wheel?

What ever happened? How did it still make boost w/o a wastegate?

Ever come up with a solution?

Try another boost gauge. Might be that simple.

Quote:

---

Originally Posted by sinr98

Try another boost gauge. Might be that simple.

---

Probably is.