NoPistons -Mazda Rx7 & Rx8 Rotary Forum
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NoPistons -Mazda Rx7 & Rx8 Rotary Forum (https://www.nopistons.com/)
-   2nd Generation Specific (https://www.nopistons.com/2nd-generation-specific-17/)
-   -   New Exhaust But No Boost Increase?!?!?!?!? (https://www.nopistons.com/2nd-generation-specific-17/new-exhaust-but-no-boost-increase-45119/)

josh greene 02-22-2005 08:48 PM
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

sureshot 02-23-2005 12:11 PM
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.

drunkin_idiot 02-23-2005 12:53 PM
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.

sureshot 02-23-2005 01:04 PM
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.

josh greene 02-23-2005 03:42 PM
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

josh greene 02-23-2005 08:37 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???

cymfc3s 02-24-2005 11:13 AM
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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