Yeah. I know on my 38mm I couldn't really run anything under 20lbs on my s256. My buddy had a hx40 and had the same problem. I've had a lot of turbos and worked on a lot of turbos. That's how it works. Small wastegates like that don't divert enough air opposed to a 44mm or bigger. My buddy has two 44s on his so he could run 20lbs to break in the engine. He has a s366et. 14 lbs on a decent sized turbo is asking a lot from a 38mm gate.

 

nvm i misread lol...i have no problems with my s252et on 15 or 25 tho

 

I guess I should rephrase that you don't have to use a small wastegate for high boost but you can. My one buddy had a 35r and ran 30lbs no problem with his 38mm. A bigger wastegate will do just as good as the smaller but the smaller ones are cheaper. To run low boost though on a turbo that flows a good amount you will need a decent sized wastegate though so it can keep up.

 

Yea I thought you meant his wg was too small for the turbo lol

 

my 38mm mvs style tial is just fine with my s256 from 8 to 20 psi. haven't gone any higher yet

 

It doesn't have a 1bar spring in it? 20-25 lbs is when the s256 really starts to wake up.

 

for all your knowledge on turbo's, you sure don't know much

first the bov being right next to the throttle body and now a 38mm gate is too small for a 55mm turbo in the low 20's of boost. i have a tial mvs 38mm. taken it to 26psi on the bullseye s256 without any creep

 

You obviously can't read. I said it's hard to run low boost on a turbo that flows a decent amount. Also your bov on the hot side is retarded.
A bov can be put anywhere on the intercooler. By the throttle is more dense air because it's cold. also it's closest to a vacuum source. You want as short of a vacuum line as possible as possible to prevent surge. A bov that's in your bumper is retarded.

 

i guess every single car manufacturer that has turbo engines is retarded too right? i guess borgwarner with their new EFR turbos which are the epitome of turbo technology are retarded? their BPV's are built into the turbo housing! how's that for close to the turbo. billion dollar company's R&D > you

 

Yeah well the boost source is right there. The vacuum line. Also zzps the bov is right by the intake manifold. Your buddies... Was in the bumper... Do some research. I've been in the turbo game since 04. I've. Learned a lot on the way. What works what doesn't. I know all about the EFR.

 

zzp's bov is by the intake manifold because the hotside pipe runs right next to the intake manifold you imbecile. my friends was in the bumper on the hotside approx 28-30 inches from the turbo

telling me of all people to do some research

 

You're going to call me an imbecile and nothing I said is incorrect. You obviously think you're the **** and know everything. In addition you can't read. Just curious did you do all the work on your car?

 

"also zzp's bov is right by the manifold" yes it's physically there, but it's not on the cold side pipe

and yes i have done everything to my car

 

I also said you can put it anywhere on the intercooler. The cold side makes more sense The air is more dense. It doesn't really matter though what ever is closer to a vacuum source. Which is why most people put them right by the intake manifold so they can have a short vacuum line. Which will give you the best response and least threat for surge.

 

you also stated having a bov on the hotside was "retarded"

let me share my "research" with you.

i used to have custom intercooler piping. 2.25 inch from the turbo to the intercooler. intercooler was a small 3 inch core, right after the intercooler was 2.5 inch piping which had the bov there followed by the MAF sensor about 20 inches after. from there it went to the throttle body. i switched to the zzp charge piping which is a full 2.5 inches all throughout and their much larger 4 inch core.

besides no longer having maf troubles between shifts, boost response is instantaneous now. no lag in between gears like before. this is my research and my experience with this platform and what i have found to work best

 

I meant his location in the bumper was not a good design. I've never worked on a turbo cobalt. I have worked on dsm's evo's and a supra. I got a cobalt to get out of the car modifying. I wanted a nice daily driver that was still quick. I realized that putting over 20k into a car and selling it for 10k was a big mistake. I have never once seen a bov on the hot side. Never seen one more than a couple feet from the throttle body. That's my experience. The cold side on your piping has no room for a bov from the looks of it. Moving a bov isn't going to change boost in between shifts. If anything the bigger core and pipes are going to cause more lag. I was trying to help the guy out about wastegates. Noting I said about wastegates is incorrect. Nothing I said about bov's is incorrect. I'll agree to disagree because obviously you're the turbo master and know everything.

 

Yeah i'm the turbo master. EVERY CAR MANUFACTURERS BPV ARE DIRECTLY ON THE TURBO. if that isn't proof enough to go against your "bov on the hotside piping is retarded" argument, then i don't know what is

 

And how many years before that were they on the intercooler piping. Or how many years was there no bov at all... They're putting all the **** into one so they can sell a turbo for $3k.

 

i haz bov on hot side rut roh

 

^^^ samesies

 

You guys have the same car. Look at any other car. Impereza Evo Supra they put them right by the throttle body.

David Buschur has his right by the TB. He runs 8s

 

not subaru they mount theres on the ic itself. not disagreeing with you just saying.

Now back to op I had an issue where during an auto-x my wastegate just want opening at all. First thing I did to check if it was the wastegate was ran a line from the turbo to the wastegate so it would open on spring pressure. It didnt work still so I pulled it apart and found out one of the plug had fallen out completely letting the air just pass right though. Make sure the plugs are in tight. Now this is the newer version with the water cooled option. if you have the old style then its a leak somewhere else.