3rd Generation Specific (1993-2002) 1993-2002 Discussion including performance modifications and Technical Support Sections.

Alternative/Replacement for Boost Control Solenoid

Old 03-09-14, 04:56 PM
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I installed a mac solenoid in my fd. I'm having a problem with boost dropping after 6500 rpm. Any suggestions to cure that? Probably going to end up getting a boost controller but wanted opinions. No pills in the lines. It's set at 11 psi and wastegate is ported. Car is non sequential. Thanks.
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Old 03-10-14, 11:18 AM
  #77  
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boost dropping after 6500rpm ? Sounds like stock turbos to me.
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Old 03-10-14, 11:35 AM
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Doesn't sound like a wastegate issue? Tired turbos?
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Old 03-10-14, 03:08 PM
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It's possible, sure, but the engine made peak power at 6500 rpm stock anyway.
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Old 03-10-14, 03:28 PM
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Oh yeah it does. I always thought the stock turbos held 10psi to redline. My boost is currently dropping to 7psi or below. Might try a turbosmart controller with their RPM boost correction factor and see if it helps.
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Old 07-05-15, 03:37 AM
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Wiring Diagram

I will be installing both Mac solenoids shortly to control my BNR Twins. Now that you all have clearly explained the vaccum routing how about a wiring diagram.
Thanks
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Old 10-08-16, 12:56 PM
  #82  
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Sorry for bringing up this old thread. I just replaced my WG solenoid with a MAC valve. The transition was quicker and the boost more stable.
Red and yellow in the graph are stock WG solenoid and green is the MAC valve.

I think I will replace the PC solenoid as well.

Attached Thumbnails Alternative/Replacement for Boost Control Solenoid-img_3531.jpg  

Last edited by Macen; 10-08-16 at 01:19 PM.
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Old 02-24-17, 06:27 AM
  #83  
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What size are the brass hose barbs that you guys are using?
Where did you source them?
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