I searched throughout this forum and did not find anything to help me. I am not sure if anyone else has experienced this but I am having severe turbo lag. This occurred after I installed a manual boost controller.

I followed many tutorials on how to install my MBC (Manuel Boost Controller) and I feel pretty comfortable on how it is installed. Here is how I installed it;

Wastegate->T-Split ->MBC
->Emissions Solenoid (bottom vacuum inlet, left top one open)
MBC->Turbo

Note*= Pill restrictor from turbo was removed

I adjusted my PSI to 24. (Tried as low as 13 and as high as 30)

Total vacuum lines length from Wastegate/Turbo -> MBC is about 1.5' or 18".

When it was all factory I remember hearing my turbo spool around 2800rpms and receiving power to the wheels at just around 3000rpms. It was very consistent and smooth.

Now what I get is turbo spooling at the same range of around 2800rpms but I do not receive power to the wheels up until 4000rpms! This is a major difference.

Things I have fixed so far; Any possible leaks around the airbox, plugged the nipple on the big hose that connects the turbo to the airbox, Replaced vacuum lines, replaced emissions solenoid.

What I have at my disposal; EvoScan/EcuFlash, plenty of vacuum lines, boost gauge.

*I have a 2006 Evo 9 with everything stock and only mod is the MBC.

What am I doing wrong? How can I fix this and what could possible be causing this?

Make sure your wastegate is tight. Ive been having that issue lately and it was exactly like yours. Take the arm off, close the wastegate shutter fully and see if you can tighten the head on the arm so that excess air isnt escaping causing late boost

one question..... Are you tuned to run higher boost? I wouldn't be increasing boost or even adjusting if i wasn't getting tuned for it.

Didn't you just post the same topic yesterday?

https://www.evolutionm.net/forums/ev...turbo-lag.html

^^^ lol

This. No reason to start a new thread. Hook up the MBC like I posted in the other thread and see if it does the same thing.

I do have EvoScan and EcuFlash but I never tuned it. I'll make sure I go through the process someone mentioned with the wastegate first. Then I will look into tuning it.

Does your Evo get power to the wheels right after spooling?

I had it that way you mentioned prior to the way it is now and with the same results. Yes I reposted same thread only because I wasn't getting satisfactory responses. Luckily my strategy worked and there are much smarter responses in this one.

I had a similar issue and found the preload for the WG was very loose. I figured the WG was deteriorating and just replaced it with a kinugawa evo 8 replacement.

What T-Split are you referring to? What is the Emissions solenoid and what does it have to do with an MBC install? Did you mean boost control solenoid(BCS)? there are two separate restrictor orifices in the factory vacuum/boost hose assembly. Are you talking about the return port on the MAF-Turbo inlet hose? What did you plug it with? What do you mean you replaced "Emissions Solenoid"? WTF is that? Replaced vacuum lines with what? On this so-called, often cited emissions solenoid why did you plug one port and leave the other open? What tutorial videos did you self instruct with?

Im guessing he is dumping all the air out of the solenoid from the turbo = no boost or very little boost Turbo -> mbc to WGA that is all that is needed.

I will be checking the suggestions that you mentioned this weekend. I am also having another issue with EvoScan. I can log just fine but I cannot read the ECU in order to save, edit, and rewrite. It logs with no issues but when I go to read edu my vehicle has to be engine on. Once it starts to read it shuts down my vehicle and tries to read but with no success. After submitting multiple tickets I have no luck with the company either. I just can't win.