My (Charge Relief) Solenoid valve broke... ?
10-15-09, 04:42 PM
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My (Charge Relief) Solenoid valve broke... ?
My charge relief valve solenoid broke recently, and the vacuum hose popped off the broken nipple. I've had that badly cracked nipple for probably about a year, but only recently did the vacuum hose actually pop off the broken nipple. I didn't notice any driveability issues, but I DO know that I have a problem.
How exactly does this Charge relief valve solenoid work? I'm gonna start saving my money to do a compete vacuum hose job, and replace FPD, rebuild injectors, water pump etc. My acceleration still feels the same, no CEL, and nothing really changed. Is the car safe to drive in the meantime while I save my money for the entire project?
How exactly does this Charge relief valve solenoid work? I'm gonna start saving my money to do a compete vacuum hose job, and replace FPD, rebuild injectors, water pump etc. My acceleration still feels the same, no CEL, and nothing really changed. Is the car safe to drive in the meantime while I save my money for the entire project?
10-15-09, 06:04 PM
#2
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/why-engine-so-damn-complicated-part-1-sequential-turbos-demystified-841821/
the charge relief solenoid supplies either pressure or vacuum to the charge relief valve. The charge relief valve is essentially a blowoff valve that runs while the secondary turbo is prespooling before transition. As the secondary turbo is spinning up to speed, the air it produces is not fed into the engine initially. That air has to go somewhere, and it is the charge relief valve's job to recirculate it back to the intake piping.
The charge relief valve needs vacuum to operate just like a traditional blowoff valve. The charge relief solenoid is normally OFF at idle, and air is allowed to flow from the Y pipe to one of the inlet ports on the solenoid valve. The maroon colored line in the diagram flows into the solenoid, and then air flows out the outlet through the yellow line to the CRV. During prespool, the ECU supplies a ground to engage the coil on the charge relief valve to turn it ON. Vacuum force now comes from the vacuum chamber (red line in the diagram) to the solenoid and through the yellow line which once supplied pressure. The Charge Relief valve opens just like a blowoff valve, and the charge air produced by the secondary turbo recirculates back into the intake.
the charge relief solenoid supplies either pressure or vacuum to the charge relief valve. The charge relief valve is essentially a blowoff valve that runs while the secondary turbo is prespooling before transition. As the secondary turbo is spinning up to speed, the air it produces is not fed into the engine initially. That air has to go somewhere, and it is the charge relief valve's job to recirculate it back to the intake piping.
The charge relief valve needs vacuum to operate just like a traditional blowoff valve. The charge relief solenoid is normally OFF at idle, and air is allowed to flow from the Y pipe to one of the inlet ports on the solenoid valve. The maroon colored line in the diagram flows into the solenoid, and then air flows out the outlet through the yellow line to the CRV. During prespool, the ECU supplies a ground to engage the coil on the charge relief valve to turn it ON. Vacuum force now comes from the vacuum chamber (red line in the diagram) to the solenoid and through the yellow line which once supplied pressure. The Charge Relief valve opens just like a blowoff valve, and the charge air produced by the secondary turbo recirculates back into the intake.
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