2nd Generation Specific 1986-1992 Discussion

New Exhaust But No Boost Increase?!?!?!?!?

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Old Feb 22, 2005 | 08:48 PM
  #11  
josh greene's Avatar
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no the purge control valve is under the intercooler, its a black circle thing and has two vac lines at the bottom and one comming out the top. I caped the lines and had no change.

here is a link of a diagram with the purge valve and what it does.

http://www.geocities.com/huguesdc1/evapcrank.html
Old Feb 23, 2005 | 12:11 PM
  #12  
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Just for a long shot - check the waste gate actuator link.

It's only held on by a dinky snap ring.

It may be unhooked.
Old Feb 23, 2005 | 12:53 PM
  #13  
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Also I didnt even think, like stated above, check the actuator line, the little vac line that runs from the turbo to the WG, it could be loose or craked.
Old Feb 23, 2005 | 01:04 PM
  #14  
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If a waste gate pressure line comes loose or gets pinched, boost will go high...



My guess - if it's not a boost leak, the waste gate is not closing.
Old Feb 23, 2005 | 03:42 PM
  #15  
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Well I already checked the link and its connected. Im gonna take off the actuator and check that when i remove the rats nest and change my UIM=>LIM gasket. also check this link to rx7club where i have been talking about this as well.

Thanks for the help keep it commin lol.

http://www.rx7club.com/showthread.php?t=397586
Old Feb 23, 2005 | 08:37 PM
  #16  
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New info I made a custom TID and now boost is at 5 in all gears all the way through redlin, chirps in 2nd and 3rd. Im gonna go to the exhaust shop tom and have them put on a straight pipe and see if its mabe the silencer thing they put on. Also I dont think there is and it may be a stupid question but theres no boost controler or regulator on a s4 TII is there???
Old Feb 24, 2005 | 11:13 AM
  #17  
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Originally Posted by josh greene' date='Feb 23 2005, 06:36 PM
New info I made a custom TID and now boost is at 5 in all gears all the way through redlin, chirps in 2nd and 3rd. Im gonna go to the exhaust shop tom and have them put on a straight pipe and see if its mabe the silencer thing they put on. Also I dont think there is and it may be a stupid question but theres no boost controler or regulator on a s4 TII is there???





The S4 boost is controlled by a small pill in the wastegate actuator line. Thats it. The S5 is controlled (poorly) by the computer via solenoid valve.
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