Boost Control Issue - Please Help!
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From: Barbertucky, OH
I've taken it apart twice now. Everything seems to be ok, the spring was seated properly, etc... I'm about to give up...sigh
i feel ur pain. i was just gettin on to post and ask for help when i saw urs. i dnt know what the problem is. i used to b able to hold 22-23 lbs now i only get 15. and i was just tuned by chris at AMS under a month ago. my bc wont adjust and i turn it up and i just hit fuel cut. and like streetthisevo im fed up. i would really like to get this fixed. ive gone over all my lines, hooked BC up both ways to compressor housing outlet and intake manifold line. same result both ways. im so lost
Last edited by cnoevol; May 24, 2007 at 06:17 AM.
i feel ur pain. i was just gettin on to post and ask for help when i saw urs. i dnt know what the problem is. i used to b able to hold 22-23 lbs now i only get 15. and i was just tuned by chris at AMS under a month ago. my bc wont adjust and i turn it up and i just hit fuel cut. and like streetthisevo im fed up. i would really like to get this fixed. ive gone over all my lines, hooked BC up both ways to compressor housing outlet and intake manifold line. same result both ways. im so lost
Al,
Last night I did run a line directly from the 'T' off of the BOV right to the wastegate. 2nd gear pull - Hit 15 and went up slowly to around 17 by redline - 3rd gear same thing but maybe saw 18. Did another pull from the top of 3rd into 4th and boost went even higher 19...20...21....cut.
My car is a 06 IX with a hair over 5k miles on it. The wastegate isn't that old and I have only taken it off of the turbo once to make room to get my hands in there to install the Buschur LICP.
Is there a way to tell if the wastegate is bad? Or to test it off of the car?
Also....the how to and BR have different opinions on how the Forge MBC should be installed. Does the vac line running off of the wastegate go into the side or the bottom of the MBC? EvoM howto says side, BR says bottom. I honestly don't remember which way I had it installed before I did the FMIC. All I know is that it worked and worked well before the install.
Thanks!!!
Last night I did run a line directly from the 'T' off of the BOV right to the wastegate. 2nd gear pull - Hit 15 and went up slowly to around 17 by redline - 3rd gear same thing but maybe saw 18. Did another pull from the top of 3rd into 4th and boost went even higher 19...20...21....cut.
My car is a 06 IX with a hair over 5k miles on it. The wastegate isn't that old and I have only taken it off of the turbo once to make room to get my hands in there to install the Buschur LICP.
Is there a way to tell if the wastegate is bad? Or to test it off of the car?
Also....the how to and BR have different opinions on how the Forge MBC should be installed. Does the vac line running off of the wastegate go into the side or the bottom of the MBC? EvoM howto says side, BR says bottom. I honestly don't remember which way I had it installed before I did the FMIC. All I know is that it worked and worked well before the install.
Thanks!!!
Did you remove the rod and then see if the wastegate is mvoing open and closed freely ?
It sounds to me that your wastegate is not opening fully
It could be either an adjustment issue or it could be a interefence issue
Well tonight I took everything off and re-ran brand new vac lines, checked connections, etc...I even pulled off the wastegate off and everything seemed to move freely. I put low 10-20 psi into the wastegate using my air compressor and the wastegate rod seems to move freely as well. Went out for a drive again with my MBC turned all the way down and same thing. I can't keep this thing under 20 psi.
I have NOT installed my fuel pump yet, do you think the car is running out of fuel maybe and hitting fuel cut? The thing that bothers me is that I do not have any control over boost anymore no matter what I do.
I'm trying to get hold of another MBC to try out.
Anymore ideas people? Al? Thanks....
I have NOT installed my fuel pump yet, do you think the car is running out of fuel maybe and hitting fuel cut? The thing that bothers me is that I do not have any control over boost anymore no matter what I do.
I'm trying to get hold of another MBC to try out.
Anymore ideas people? Al? Thanks....
I would try to adjust the length of the rod to try and get the gate to open more and see what effect that has
Al
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From: Barbertucky, OH
Did you remove the wastegate rod when you put an 02 housing on ?
Did you remove the rod and then see if the wastegate is mvoing open and closed freely ?
It sounds to me that your wastegate is not opening fully
It could be either an adjustment issue or it could be a interefence issue
Did you remove the rod and then see if the wastegate is mvoing open and closed freely ?
It sounds to me that your wastegate is not opening fully
It could be either an adjustment issue or it could be a interefence issue
Last night I ran a vac line hooked from my air compressor into the wastegate at a low psi level and the rod seems to move freely. I checked the wastegate flapper on the turbo and it moved freely as well.
Today we did a pressure check on the entire system at 30 psi and everything seems ok and no leaks. I installed a cheapo home depot MBC and turned it down all the way. It acted just like running a line right into the wastegate. My Forge unit on the other hand is the exact opposite. I will be installing a new Forge unit at the dyno on Saturday to see what it does.
I want to get her tuned at 22-23 psi. I'm thinking the fuel pump and a tune might help the issue. I'll try and adjust the actuator arm on the wastegate once it cools down.
Thanks Al and let me know what else you think it may be.
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From: Barbertucky, OH
Update:
I just lengthened the wastegate actuator arm two threads to see if that would help. Still the same thing. I don't want to lengthen it anymore in fear of having the flapper not seal correctly.
I just lengthened the wastegate actuator arm two threads to see if that would help. Still the same thing. I don't want to lengthen it anymore in fear of having the flapper not seal correctly.