Why are you just randomly buying stuff, trying to fix the issue??

Do a clear diagnostic, find the actual issue, then buy the correct part that fixes the issue.

BTW, Mellon Racing is in Nashville I believe. They can help you out. Also Spec-OP and Forced Fed are kinda near by.

 

like i said the boost controller solenoid is new and the hoses are ran the same as i took it off to change it. Then I bought the MBC to hook up and it take the solenoid OUT OF THE LOOP. And the MBC is hooked up right, the bottom outlet goes to the source of boost so i have it hooked up to the turbo compressor housing and the side outlet goes the wastegate which is hooked up there.

 

it's not "random parts" it's called upgraded, everything I replaced besides the boost controller solenoid and wastegate actuator, was a upgrade then what was on there. And I thought maybe it would fix it at the same time.
Even at 12psi I still run 8.2 in the 1/8 mile, so I wasn't really worried about it, I'm get tired of it. I was just wanting it back at factory Boost

 

im near nashville. i work everyday of the week but if you wanted you could drive up one night and we could take a look at it and i could try my best to help you out. im maybe 45 min northeast of nashville. let me know if you want pm me. i also have a tactrix cable and evoscan and ecuflash we could log your car as well if we cant figure it out to give others an idea.

 

and no mellon racing is in memphis like a 3 to 4 hour drive away. NOTHING is in nashville car wise period unless you drive a "stang" or you want Carma Performance to F**K something up or possibly blow your car up like they did one of mine.

 

The fuhh, sure thought it would be leaks

 

To my mind you can't rule out insufficient wastegate spring pressure as a possible cause of your problem until you test it for yourself.

 

This might be stupid but, have you checked your wastegate flapper on your hot side? I read on someone else's thread that was there issue. I think he said his "warped" or something. I hope you get this fixed man!

 

sounds like boost leak. my .02cents

 

the wastegate is brand new from the factory, and i also bought a forge one and still nothing.

As far as the hotside, if you read my first post of the things i've replaced, I've already replaced that, because it was warped. I upgraded from the stock 10.5mm duel flapper set-up to the 9.5mm single flapper and welded it so it would loosen up on me over time (like they seem to do). And when I had it off I took the compressor side to "Turbo Auto" down in nashville and they said everything was fine with that part.

And when I put the new hotside back on, you could tell a hell of a difference and I gained like 1 psi, so I'm thinking it is a few things that all just went at one time.

 

Did you preload the WG when you installed the actuator onto the turbo? Incidentally which of your two actuators(Forge, or stock) is fitted to the turbo at the present time?

 

[QUOTE=YellowVlllGSR;10252971]....the wastegate is brand new from the factory, and i also bought a forge one and still nothing.....As far as the hotside......I upgraded from the stock 10.5mm duel flapper set-up to the 9.5mm single flapper and welded it so it would loosen up on me over time (like they seem to do).....,when I put the new hotside back on, you could tell a hell of a difference and I gained like 1 psi....../QUOTE]



OP It is a bit scary for me to read the contradictory content in your post. I understand that you are trying to solve the issue of low boost. I can appreciate the time and expense involved on your part. You seem just a wee bit lost though. I guess that's what is most scary to me. There are people on here that are going to help you solve this thing. Don't worry.

The first thing to do is to settle down and stop throwing money at it. More new parts are not gonna help one bit. Stop going to your local "Turbo Wonderland" or whatever that place is called too.

Hey aren't you close to Chris Mellon's shop? You gots to get someone that has an idea which end is up and which end is down to take a look at your Evo. Other than that we are all here to help you. You're gonna lick this low boost demon. Just stop throwing good money after bad.

 

sparky, no he is not near mellon. its 3 hours away... unless that seems near to you, but it doesnt to me. and to make a remark like "your local "turbo wonderland" without knowing the place he is reffering to isnt very smart. the guy at turbo auto in nashville knows his S**T. not trying to be a smartass, im just saying he knows what he is doing.

i have had just about every boost problem under the sun which you, Sparky, have helped me with. i live less than 45 min from this guy and have pm'd him about him coming up my way and ill try my best to help him and let him use my tactrix cable at the very least if i cant figure it out to give others an idea. so its all up to him. someone actually helping in person will always be better than words on a screen.

 

Have you disconnected the hose going to your wastegate actuator? That would at least help you rule out your MBC.

 

Figured i would update this since the op hasnt. He drove down and i got to take a look at it. He had multiple bboost leaks. One was at the mbc. We took the vacuum and eliminated the solenoid and mbc by running the wg directly to the j pipe. We leak searched again and found a huge leak at the j pipe. There was. No gasket. Between the turbo and j pipe. By that time it was dark and he had to leave. Yesterday he text me and said that he installed a new gasket but the. Problem was still there. Only worse. Now it will only boost to 9 psi. Im pretty sure. The. Drop in psi from 12 to 9 is only from us running wg to turbo since it. Is now only spring pressure but there is still 5 psi low. Im still under the assumption its a combination of leaks myself, and steven your more than welcome to bring it back ovver anytime so we can keep looking. I also would like you to try and get another bolt for the. Manifold stud that was missing one. The smallest exhaust leak before the turbo will effect it. More than you think.