[HappyMint]

Tunes won't magically change themselves, unless you have tephra mod and accidentally swapped maps (which would be hard to do).

 

[HappyMint]

Check for an exhaust leak. I'm still thinking it's boost related. You definitely need to do a major boost leak test.

 

[HappyMint]

the line that routes back to the intake is pointless, you can vent that to atmosphere if you want.

Which would be venting metered air to atmosphere. Not going to get into the VTA debate, just making sure this is understood. The MAF has already metered this air.

 

[HappyMint]

yea I know that. I meant VTA on that 3port line would have no effect on how his turbo was spooling.

Indeed, it would have no effect. However if that line was plugged/crimped somehow, then when the 3 port opened to vent air back through the intake to release pressure away from the wastegate, it wouldn't be able to because of the plug, and consequently the pressure would not be released and would instead push open the wastegate, which would obviously result in him not being able to generate any boost (the issue he is having). Which is likely why someone previously suggested checking this line.

 

[HappyMint]

http://www.evoxforums.com/forums/showthread.php?p=1034032#post1034032

In this thread they just resolved an issue that may be related. The MFI relay could be broken thus causing your solenoid to remain in the open position. This would mean no boost pressure would be diverted away from the wastegate and consequently would mean the ecu has no waste gate control.

 

[HappyMint]

I need a better description of the boost curve here. Is it like 0 boost before 4k rpm? Or like 15 pounds until 5k then you get full boost? Do you have any logs of this that show us a boost curve on virtual dyno maybe?

 

[HappyMint]

I did log the boost, let me upload it in a bit. Gotta get my AP out of the car and upload the data.

Its around 2psi till 4-4.5k rpm around 5k rpm it hits 16-17psi and stays there till 7-8k rpm. I am suppose to get 22-26psi and it is all I have been getting so far.

This is a very odd scenario, you would think the spring on the wastegate would allow the turbo to spool at least some until the boost pressure exceeds the pressure of the wastegate spring and opens the wastegate. Even if your 3 port was stuck open (diverting no air away from the wastegate) you should be hitting at least the PSI of whatever wastegate spring your car has. If I had to guess it'd be that your wastegate is cracked open somehow and is diverting exhaust and it is only until you hit a certain RPM that your turbo is flowing enough air that the cracked open WGA isn't diverting enough air to prevent spool.

We shall find out if my noobie estimation is correct!

 

[HappyMint]

I know in the end you are right on this, you have been with all the things I needed your help with haha. Not living local to the shops we use aka cobb @ plano is one of the mistakes I have made. Logically speaking, I shouldnt have touch my evo at all haha. Shit happens all the damn time, whether it be minor or major (thankfully nothing major so far). But not being able to 100% enjoy the vehicle and be done with all the tiny little shit just pisses me off now... I get to enjoy the vehicle for a couple of weeks and bam something small... I still love the car, just hate driving it lol. I should be back at Dallas Tuesday around 2 or Wednesday around 2 FOR SURE.

Unfortunately if you don't live near a shop (I'm like 3+ hours from the closest decent Evo shop) you need to be knowledgeable enough to trouble shoot stuff yourself, or have a friend who can. I have a friend who's much better at wrenching on stuff than I am - he also has a badass tool set. I on the other hand, am constantly searching for more knowledge so that I can use it to tell him what I think the issue is and what I want to have him help me with in order to fix it. There are so many particularities with every car, it's not possible for a single shop to be experts on everything, which is why these forums are important!