Can not pass 11 psi. Help!
Aug 26, 2007, 11:01 PM
#16
Evolving Member
Join Date: Sep 2006
Location: Reno, NV
Posts: 204
Likes: 0
Received 0 Likes
on
0 Posts
I have the FORGE UNOS, and i have the soft spring installed.....it took me at least 20+ clicks to get to where i need to be. I think for faster spool, run the solenoid that is connected to the turbo outlett nipple, and T it into the intake line. Capp off the turbo outlett.
Errrr, no.
Aug 27, 2007, 05:53 AM
#19
Newbie
Thread Starter
iTrader: (8)
Join Date: Jan 2007
Location: nj
Posts: 65
Likes: 0
Received 0 Likes
on
0 Posts
this is the mbc.
The tubing is coming straight from the the turbo nipple to the side on the right of the picture. Then from the side on the left of the picture to the wga.
i used the tubing that came in the kit and also replaced it with 4mm windshield washer tubing this made no difference. Ive also turned the knob all the way both ways for no difference.
The tubing is coming straight from the the turbo nipple to the side on the right of the picture. Then from the side on the left of the picture to the wga.
i used the tubing that came in the kit and also replaced it with 4mm windshield washer tubing this made no difference. Ive also turned the knob all the way both ways for no difference.
Aug 27, 2007, 09:50 AM
#22
Evolving Member
iTrader: (2)
Join Date: Apr 2006
Location: M-Town, Illinois
Posts: 170
Likes: 0
Received 0 Likes
on
0 Posts
I thought you have to remove the restrictor pill so you can boost more? Thats why they call it a rI thought you have to remove the restrictor pill so you can boost more? Thats why they call it a restrictor pill cause it restricts. estrictor pill cause it restricts.
Aug 27, 2007, 10:58 PM
#23
the restrictor pill on the wastegate side shouldnt be removed, bec this pill will let the boost increase! this pill will delay the open of the wastegate and thus letting more boost to built up!! narrowing it on the wastegate side will increase boost! but on the solenoid side its ok if u remove it!
Aug 28, 2007, 03:38 AM
#24
OK, it appears most people do not understand how the stock boost system works, or how an MBC system works on an EVO.
The stock system has:
There are three endpoints on the stock system, the turbo outlet, the wastegate actuator, and the boost solenoid. The way the system works is, the turbo outlet pushes boost through it's line, that boost is slowed by the restrictor pill to prevent the WGA from receiving it all at once. The ECU also bleeds off some of the boost into the intake to prevent the WGA from receiving even more of the air. This bleed is called WasteGate Duty Cycle, and is from 0 to 100% in your ECU.
Now, if you take the restrictor pill out from the turbo line, the wastegate will receive 100% of the boost the turbo makes (and the solenoid can't bleed it off in time) and the wastegate opens at spring pressure of 10.5 psi.
There is also a restrictor pill on the solenoid side which reduces how fast it can bleed. This is to reduce spiking of boost.
Either way, without a restrictor pill on the turbo side, you won't boost more than 10.5 psi because the WGA is getting hit with 100% boost
Now, as far as an MBC...
Usually the vacuum lines are replaced and the MBC is sourced from either the turbo outlet or the BOV bleed line, and then directly to the WGA. The MBC will not pass any boost to the WGA until it's set spring level is achieved. In essence, the MBC reduces the amount of boost passing through it so the WGA only sees it after a certain point.
You could think of an MBC as an adjustable restrictor pill, because that's really what it is.
The stock system has:
There are three endpoints on the stock system, the turbo outlet, the wastegate actuator, and the boost solenoid. The way the system works is, the turbo outlet pushes boost through it's line, that boost is slowed by the restrictor pill to prevent the WGA from receiving it all at once. The ECU also bleeds off some of the boost into the intake to prevent the WGA from receiving even more of the air. This bleed is called WasteGate Duty Cycle, and is from 0 to 100% in your ECU.
Now, if you take the restrictor pill out from the turbo line, the wastegate will receive 100% of the boost the turbo makes (and the solenoid can't bleed it off in time) and the wastegate opens at spring pressure of 10.5 psi.
There is also a restrictor pill on the solenoid side which reduces how fast it can bleed. This is to reduce spiking of boost.
Either way, without a restrictor pill on the turbo side, you won't boost more than 10.5 psi because the WGA is getting hit with 100% boost
Now, as far as an MBC...
Usually the vacuum lines are replaced and the MBC is sourced from either the turbo outlet or the BOV bleed line, and then directly to the WGA. The MBC will not pass any boost to the WGA until it's set spring level is achieved. In essence, the MBC reduces the amount of boost passing through it so the WGA only sees it after a certain point.
You could think of an MBC as an adjustable restrictor pill, because that's really what it is.
Last edited by recompile; Aug 28, 2007 at 03:42 AM.
Aug 28, 2007, 08:53 AM
#30
Newbie
Thread Starter
iTrader: (8)
Join Date: Jan 2007
Location: nj
Posts: 65
Likes: 0
Received 0 Likes
on
0 Posts
So is it possible that I have a defective mbc then because I cannot find any major leaks and never spike or exceed 11 psi?? Or should I readd a pill?
Last edited by diezilnj; Aug 28, 2007 at 08:56 AM.