speedjunkie

iTrader: (3)

I know, I know. I did search and read many threads, but I know of at least 2 different single turbo vacuum diagrams. I don't have an oil catch can so I ended up having to run a modified version. I'm not sure if this makes any difference, but I'm using an AVC-R boost controller, SARD FPR, HKS wastegate, Tial BOV, Garrett GT3767S DBB turbo and Rotary Extreme monster VMIC. And here is the way I'm currently running my vacuum lines...

-top of wastegate to UIM by the throttle body
-side of wastegate to COM on boost controller
-NC of boost controller to IC piping (on turbo side)
-bottom of filler neck to nipple on turbo (as directed by internal comsuktion engine)
-side of filler neck to UIM by throttle body
-nipple on LIM behind secondary fuel rail to FPR
-end of UIM to boost gauge
-end of UIM to boost controller solenoid
-UIM (by throttle body) to charcoal can solenoid
-UIM (by throttle body) to BOV
-oil injectors to small filter (from stock rats nest)

The problem I'm having is my wastegate isn't opening. I'm thinking the line going from the top of the WG to the UIM near the TB is the problem. I've seen people that aren't running that line at all. When we boosted on the dyno tonight it blew off the line going from the filler neck to the UIM, and I have the line to the top of the WG ran right next to that, so I'm thinking the pressure through that line is keeping the diaphragm from moving up to release the pressure. Does that sound about right?

Azcamel

iTrader: (1)

that way does nto work for me either, here is what i did.
Do NOT use the UIM for pressure for the wastegate. Line out from the turbo, your pressure source for the boost controller, "T" that off and one goes to the boost controller and the other to the side port of the wastegate. Then the line out goes to the top of the wastegate, this will give positive pressure to keep pressure close and when your desire pressure is met it will let the the line out form the boost controller open the top wastegate. I use this method to control my GT42 with dual 38mm tial.

according to the tial instruction you that how you run it, you ahve the option of venting the top of the wastegate but to controller the pressure better they recommened the way i described.

speedjunkie

iTrader: (3)

Actually I was incorrect, I got the first two mixed up, they're actually set up like this...

-top of wastegate to COM on boost controller
-side of wastegate to UIM by the throttle body

However I was also mistaken because the wastegate IS opening, it's still not cutting off at 10psi like it's supposed to though. I removed the hose from the COM port on the boost controller valve (basically removing it from the top of the wastegate), letting the spring control it, and it did cut off around 10psi. So we're just going to tune to 10psi for now and figure out what the problem is in the mean time. I'll try what you described before we start tuning though and see what happens.

speedjunkie

iTrader: (3)

We ended up tuning it to 10psi (the wastegate spring) until I could figure out what was wrong with the boost controller. Well, come to find out I had the NC and NO ports switched, so I was using NO instead of NC like I was supposed to. I swapped them and now the controller controls boost...although it's a little TOO well now. Frank (my tuner) had set the controller to about 7psi so he could see a difference between the spring rate of the WG and if the boost controller was actually working. I reset it to 10psi for setting A and 15psi for setting B and now it still won't go above about 7 or 8psi. I turned off the controller completely today to see if the spring pressure would win out again and it still only got up to about 9psi. So I'm wondering if I have something wrong again, here is my setup right now, it's a bit different than my first post in this thread.

-top of WG to COM on the boost controller valve
-side of WG to
-a T fitting going to IC piping just after turbo
-and NC of boost controller valve
-NC of boost controller valve going to
-T fitting to IC piping just after turbo
-and side of WG
-nipple on turbo compressor side to bottom nipple on oil filler neck
-end of UIM to boost controller solenoid
-end of UIM to boost gauge
-rear of UIM to MAP sensor
-nipple on LIM behind secondary fuel rail to FPR
-side of oil filler neck to UIM near TB
-UIM near TB to charcoal canister solenoid
-oil injector lines to small filter (I used one of the tiny filters from the stock rats nest)
-BOV to UIM near TB

Does anyone see a discrepancy?

speedjunkie

iTrader: (3)

Seriously? No one??

Dudemaaanownsanrx7

iTrader: (23)

you cant go lower then the wastegate spring pressure. it sounds like you have a boost leak. or somehow the wastegate is stuck open. check for boost leaks first.

speedjunkie

iTrader: (3)

Well I started thinking about the hose going from the turbo to the filler neck, but that was more because the car was smoking so bad. I forgot to put my oil cap back on this morning and it wasn't really smoking at all, so I've changed some things.

At first I had the side of the WG going to the UIM near the throttle body, then I moved it to the T going between the NC on the boost controller and the IC piping. I swapped it to the end of the UIM and I got up to 10psi, but I also had my oil cap off and that line going from the turbo to the filler neck, so I would imagine there would be some boost lost there.

I now have the nipple on the turbo capped off (I might plug that back into the fuel atomization line), the bottom nipple on the filler neck vented to atmosphere (would go to a catch can if I had one), and the side of the WG still attached to the end of the UIM. The only thing I wondered about now was the PCV valve between the filler neck and UIM, but I blew into both ends and it only flows from filler neck TO UIM so I left it on there for now. The diagram doesn't even have that line so I might end up taking it off completely. I'm going to test it tonight and see what happens.

I know what you're saying about not being able to go lower than spring pressure, and when I had it hooked up to NO instead of NC and would unplug COM from the top of the WG, it would work just fine. Now that I'm using NC like I'm supposed to, even when I unplug COM I still only get what I get when it's plugged in. And no matter if it's set to 10 or 15 psi, I would still only get around 8 or 9.

speedjunkie

iTrader: (3)

I got up to 12psi with this setup, but that's on both the 10psi and 15psi settings, so something is still not right. Can ANYONE give me some info?

Oh and it's only smoking a little now, under full boost, and it's mostly just black now instead of burning oil. It's still running a little rich so we're going to tune the fuel back some.

This is how I have it set up now...


-top of WG to COM on the boost controller valve
-side of WG to end of UIM
-NC of boost controller valve going to IC piping just after turbo
-nipple on turbo capped
-bottom nipple on filler neck vented to atmosphere
-end of UIM to boost controller solenoid
-end of UIM to boost gauge
-rear of UIM to MAP sensor
-nipple on LIM behind secondary fuel rail to FPR
-side of oil filler neck to UIM near TB
-UIM near TB to charcoal canister solenoid
-oil injector lines to small filter (I used one of the tiny filters from the stock rats nest)
-BOV to UIM near TB

Dudemaaanownsanrx7

iTrader: (23)

I kinda still have a feeling you have a boost leak. If you can get your hands on a pipe pressure tester or make one. Its easy to make you just need a plug the size of your boost piping 2.5-3" usually. I made one with exhaust pipe 6" long then welding flat metal square on the end to seal it and a bead around the other end of the pipe for the coupler to grab. Then drill a hole and put a tire valve in where the flat metal is. Disconnect your boost pipe from the turbo and put the pressure tester in right there fill the pipes with air and listen.

speedjunkie

iTrader: (3)

Haha, I actually picked up some stuff today to make a leak tester. I made a set for the twin turbos too. I don't have a leak though. I boosted pretty well this morning...13psi and I didn't have the pedal all the way down. But later in the morning I only got 10psi. So I thought for sure I had a leak. Tonight I removed the line with the PCV valve between the filler neck and UIM and capped both sides. I also moved the WG side line back to the T between the NC port and IC piping. On the drive home I got up to 15psi, but only after hanging around 10psi first. Although I wasn't mashing the pedal down at first, but there was only a little left. When I got home I put the WG side line back to the end of the UIM and see what happens tomorrow.

speedjunkie

iTrader: (3)

Boosted again yesterday morning and if I remember right it only got to around 10psi (but I don't really remember too well haha), so when I got to work I swapped the lines back the way I had them two nights ago. Boosted again yesterday and last night and I had the pedal all the way down this time. It hung around 10psi for a long time, then fluttered around 13psi but stayed between 10 and 15. Got up to 120+ though haha.

speedjunkie

iTrader: (3)

Aaaaaand there goes another turbo gasket, hahaha. This **** is getting hold.