Okay, so I'm sure this question has been answered plenty of times, but I would just like a better understanding of whats going on. I recently just turboed my 1985 AE86 Corolla 16 valve. I installed a 16G turbo with iwg, and running around 7 psi. I am getting compressor surge. I'm not even sure if the BOV is opening up. Now before you tell me its a bad BOV, I will tell you that I have tried 3 different BOVs. When I rev up to about 6k RPMs I hear a wa cha cha cha sound(lol), if I shift anywhere from 2k to 5k nothing happens really. I have the BOV hooked up to a good vac source, I have tried modifying one on the BOVs by removing one of two springs inside so its super soft, still no luck. I am kinda stumped. If anyone can help me with this issue, I would definitely appreciate it. Let me know if there is anymore information needed.
Thanks
Here is a picture of my set up for reference.
And another from a few weeks ago, when I just finished the install.(Sorry about the dirty engine bay.)
I had a similar problem on my Honda and it was because I put the vacuum line to too weak of a vacuum source ( I put mine on the intake side of the turbo and that didn't work, moved it to the intake manifold and it's all good). I would run the vacuum line for the BOV as close as you can to you intake manifold as you can, if not right on it. Hope that helps.
Okay, so the vac line thats going to it goes a little like this.
It comes from a nipple on one of the pipes on the intake manifold side. Should I change that way it routed? The hose is kinda long, should I cut it down as much as I can?
if it's before the throttle body, the vacuum line will have pressure on it and not let the bov open, after the throttle body you'll get vacuum and it will allow the bov to open.
It looks like those lines are after the throttle body and should work, and keep the vacuum line to the bov as short as possible.
Okay, so I tried running the line from two different places, and still the same results. I tried running the line from one of the nipples by the TB, and even the breather thats right on the intake mini.
Here and here.
check the vacuum lines on the throttle body to make sure theres enough vacuum coming from them. best way would be a vacuum gauge but if you start the engine and pull a line off you should be able to here and feel a good vacuum source. find out how much vacuum it takes to open the bov. you want to adjust the bov to a setting just over the vacuum signal from the engine at idle. for example: if your engine produces 20 inhg at idle then adjust your blow off valve to open at 22-25 inhg.
Compressor surge issue.
