ok to begin with i have a full turbo back exhaust, intake and ecu. I was having problems keeping my boost below 15psi before so i drilled out the nipples on the elbow off of the turbo and installed a home depot manuel boost and prespool controller. It worked and i was able to lower my boost to 10 psi on the first turbo but got 4 psi on the second turbo (I dont know if i was getting propper boost on my secondary before this anyways because i just installed my boost gauge). So basically i went non-seq (poor man's) and I get 8 psi with my boost controller all the way open but my boost does not go up if i close it. The only way i can raise my boost is if i close the valve COMPLETLY and that brings me to like 16 psi!!

also yesterday i noticed something wierd. on the highway in third gear at like 6000rpms my boost went from its normal 8 to 10. why is this happening?


I cant figure out what the problem is. Could it just be the boost controller itsself? or could it be that i switched the electrical plugs on the wastegate control and prespool control when i went non-seq? Also there is another nipple besides my boost controller nipple that comes off of the wastegate acuator near the bottom, am i supposed to plug that? those are my only ideas!!

 

Did you remeber to remove the restrictor pill?
If not them do that, Or swap the watsegate and precontrol solinoids plugs around.

 

Which nipple did you drill out? Are you running a Power FC on your car? Perhaps its your bleed valve, try getting a new one or perhaps a larger/smaller one.

What were the steps you took for the poor man's non-seq?

 

i drilled out both nipples on the turbo elbow, and no there were no restrictor pills in the line, becuase i had to drill out the nipple instead. I am running a Pettit Ecu. Its a homedepot boost controller so i might try a ball and spring one.

Oh and i followed all the steps on don'tbearikki.com the address is: http://www.dontbearikki.com/id49.htm

What do you think?

 

anyone?

 

I think your solenoid valve is stuck closed.
so you see 8psi which is close to waste gate spring pressure.

and of course if close valve completly waste gate never gona open that'll give you big engine blowing boost.

I think you can switch solenoid valve and try..

 

hmmm does the Pettit Ecu control boost just like the powerfc in which it uses the turbo precontrol solonoid to control boost? If it does, you might need to swap the eletrical/vaccum hoses with the wastegate solonoid.

im still not sure what you mean by you "drilling out both nipples on the turbo elbow, and no there were no restrictor pills in the line, becuase i had to drill out the nipple instead" Do you mean you took the vaccum line out and some how welded a larger nipple on there so that you could use larger lines so you can lower boost or have faster response with the wastegate/turbo precontroler? Are you using a new vaccum line for the wastegate/turbo precontroller lines? Perhaps you should try using new ones, the other might be leaking after 10 years of extreme heat. (Mines were becomming rock hard! )

Keep us updated on how the ball and spring type one works.

P.S. you got a dp, mp, straight thru type catback right? I'm a bit confused by what you mean by full turbo back exhaust.

 

i Don't know how the pettit ecu controls boost. I switched the electrical plugs on the two soliniods around though, maybe i will try to switch them back to how they were originally. But why are you saying i should switch the vaccum lines also?

On the newer turbos instead of a restrictor pill in the wastegate/precontrol lines they have the restrictor built in on the two nipples that come off of the compressor housing on the turbos If you take that little elbow off and look directly down into the nipple you will see the opening gets smaller at the end------that is the restrictor. All i had to do was take a drill to grind away the restrictors in order to lower my boost beacuse i was getting 15-16 psi with those restrictors in place.

and yes by a turbo back exhaust i mean downpipe midpipe catback.

 

what do you mean by switching the solenoid valve? as in getting a new one? or switching the vac hoses to the soleniod next to it? right now i have the wastegate's(soleniod to the right) vaccum hoses plugged up just like it shows in don't be a rikki's how to: http://www.dontbearikki.com/id49.htm

 

Swap the elctrical plugs on them.

 

ok i just swapped the eltrical plugs back to the stock position and i can get around 9 or 10 psi but it comes on very late, like around 5500 or 6000 rpms. I dont know i think Red rotor might be right about my soliniod being stuck closed. could i try plugging in the wastegate acuator vac hoses and then plugging up the pre control acuator hoses with bolts? (which is the opposite if what im doing now)

 

ok this is what is happening i just took it for a bunch of test runs, ill see 8 psi first gear, 8-9 psi second gear and 10 in third gear. It takes 6000 rpms to get to ten though!!

 

Buy an Eagle Talon TSi, no problems and no worries! Except the damn trannies, but get it rebuilt..THEN no worries! Later Frank

 

serously anyone have any ideas what my boost problem could be? could i try plugging in the vacuum lines on the wastegate soleniod into the soleniod. and plugging up the lines that go to the precontrol soleniod. (right now i have the wastegate vac hoses plugged with the precontrol hoses plugged in- so what i would be NOW doing is vice versa that)

 

for many cars this is noraml, lower boost in lower gears...higher boost in high gears.

 

Sounds like nonsequential twin turbo operation to me?

 

yeah i know, but the problem is i can't raise my boost by using a manual boost controller. If i close it all the way then i'll see 16 psi+ but if i close it just a little or a lot it will always stay constant at 8psi (unless in high gears).