Gen 4 5.3, sloppy stage 2 cam, ls6 intake. Terminator x. Vs racing 7875 next gen .96 ar t4. 44mm xspower wastegate. Spring is supposed to be a 8-9 psi. On transbrake and 2 step at 3500 rpm wastegate opens at 9 psi. At 3800 it holds 10.5 psi. When you go wot on street it hits my 15 psi boost limiter. No controller. Hose straight turbo to bottom hole in waste gate.

 

Got a picture of the placement?

 

Have you bench tested it? Make sure it opens fully -no binding. There's a sloppy video on this. If it tests OK then placement is probably the problem. Waiting on pics

 

Put a jgs 50mm gate on it and your life will be great. Placement won’t even matter. And they are a piston design with no diaphragm. Just billet machined Piston with orings. Made in the good ole US of A as well.

I can’t figure out for the life of me why people cheap out on the single most important part in the system (imho)...


but to help you... your gunna have to bench test it with compressed air. Check for smooth movement and no binding. Chinese gates occasionally (lol) have QC issues. And with a 44mm gate your wastegate placement is going to have to be good, giving the gate priority)

 

Because that wastegate costs the same as most of our turbos...

 

Just slap another gate on it to vent both banks. It's cheap and easy.

 

So spend less and fight with controlling the boost for hours. Idk about you but after hours I make $50/h. So I value my free time at $50/h. Couple days of fighting a inferior part and I’m “into” the cheap gate the same as the big gate.

Time is valuable in this short life. Hell I own multiple tuning software and years of experience messing with the factory pcm... I still spent $1000 on the Holley because it saved me way way more than that in time:.. and well... it’s better

 

Would something like this work. Block off factory and make two more.

 

Or like this

 

My car came with eBay 50mm BOV. I noticed on dyno it wasn’t making any noise. Later I took it off and noticed the housing had all bits of material on it. So when it tried opening, it was scraping all the metal bit and sticking. i wire wheeled them all smooth and it’s fine now. I would check wastegates for similar situation.

as for placement, my waste gates don’t exactly have smooth transition. However it’s super close IMO and I still get boost creep. Waste gates should have direct flow to it. No sharp bends when it needs built up pressure to have good venting when open. You can see where mine is now vs where I should’ve put them. My creep is only 2 psi or so though.

 

If your solution is to throw money at it then what do I care. But it's still better on a forum to at least explain a fix or something. Even if he had the best gate and installed it in the worst place there is still a lot to be gained by knowing why its the wrong place and putting what ever gate he has in the right place.

If you want to save time by spending money then buy a Hellcat and some shop installed mods and be done with it...Why even lift the hood?

 

Gate turned out fine. Starts cracking open at 8 and fully open by 10. Smooth and fast.

 

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Saved a lot of money on those ebay injectors when they hang open or when your wastegate doesn’t open and you send the headgaskets/rods/pistons packin huh?

I don’t have a million dollar car. Hell it is just a run of the mill SBE 5.3 car... Some things I feel are more important than others. I have 2k in shocks.. 6k in suspension/rear end.. $400 wastegate... But I have a stock truck tb, stock ls6 intake, stock heads, factory square coils, truck mani turbo kit I built, box stock BW s475, treadstone Intercooler, etc etc

I just think fueling and boost control should be top priority when you turbo anything. If you make sure those two things work well then life will be easy.

 

That wastegate placement is certainly not ideal but can probably be made to work . Had the same problem with my homemade Y and a slightly better angle for the wastegate. I made a small "dam" to direct exhaust towards the wastegate - saw /read it in here somewhere. Works on my set up 6l 7875 44mm vs gate.I'll try to send a pic - can tune but have no other computer skills lol

 

Crap I hit 15.1 at 6500 rpm with no wastegate at all on it. Just open hole where it goes.

 

holy crap! Did ya only cut a 1” hole or something?! Lol

 

That tells you that the gate isn't the problem, that small tubing and bends plus the placement at merge is. If it's not too difficult try adding a dam like I pictured, weld it in good enough to not let go and wreck your turbo , can always grind it out if it doesn't work and you want to go another route. I'm pretty confident it will work!

 

It's poor placement as stated, not the gates fault. Why are you concerned about 15lbs? Drop timing out of it from 3800-5500 rpm and call it a day?

Or as mentioned divert the exhaust into the gate as pictured. What I don't like about that is the "dam" is going to get VERY hot and possibly break off overtime. Esp. if that hot side is made of thin material. Likely to crack etc... With homemade thick mild steel as pictured, it's less likely. May be easier to put a small cheap (32mm is fine) gate on the turbo housing. Less likely to crack there. Again not my fav spot because the gate absorbs a ton of additional heat... but it should work if you absolutely have to be at 8-9lbs and isn't likely to crack out.

 

It doesn't stop at 15. I dont know where it will stop. 15 is just where I set the boost cut. I'm in the process of adding a second 44mm wastegate. I'll post pics and results when finished.