What is the CRV
#3
5yr member, joined 2001
Here is a copy & paste from the third page of this thread:
https://www.rx7club.com/forum/showth...hreadid=118780
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The CRV is the Charge Relief Valve.
It vents the charged air from the rear (secondary) turbo until 4500rpm. At 4500rpm the CRV closes and the Charge Control Valve (CCV) opens to allows the boost from the rear turbo to combine with the boost from the front (primary) turbo. If you didn't vent the secondary boost before the CCV opened, then the boost would push back on the secondary turbo and not allow it to spool very well.
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Here is a pic from page 2 of the same thread:
https://www.rx7club.com/forum/showth...hreadid=118780
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The CRV is the Charge Relief Valve.
It vents the charged air from the rear (secondary) turbo until 4500rpm. At 4500rpm the CRV closes and the Charge Control Valve (CCV) opens to allows the boost from the rear turbo to combine with the boost from the front (primary) turbo. If you didn't vent the secondary boost before the CCV opened, then the boost would push back on the secondary turbo and not allow it to spool very well.
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Here is a pic from page 2 of the same thread:
#4
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Originally posted by SERIES7
The Charge relief valve is what opens up your gear box and enables you to down shift into second gear when going 90mph. YEs.
The Charge relief valve is what opens up your gear box and enables you to down shift into second gear when going 90mph. YEs.
The charge relief valve essentially serves as the wastegate for the primary turbo under 4500 rpm. It vents excess air and pre-spools the secondary turbo so the boost doesn't dip excessively when the secondary comes online.
#6
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6.Charge Control Actuator:
When closed, this prevents Primary boost from going into the Secondary Turbocharger. This valve seals the air passage the same way as the throttle butterfly valves. This remains closed until 4,500 RPM AND Secondary boost pressure is the same or more than Primary boost pressure.
When closed, this prevents Primary boost from going into the Secondary Turbocharger. This valve seals the air passage the same way as the throttle butterfly valves. This remains closed until 4,500 RPM AND Secondary boost pressure is the same or more than Primary boost pressure.
#7
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There is ALOT of bad information on this thread. I think too many people have gone non-seq or single and forgotten how the sequential system works .
It is difficult to understand what the CRV does without understanding how the entire sequential system works. It's really not that complicated, in theory. It is explained in the shop manual, and here:
http://www.autosportracetech.com/RX-...erOverview.htm
It is difficult to understand what the CRV does without understanding how the entire sequential system works. It's really not that complicated, in theory. It is explained in the shop manual, and here:
http://www.autosportracetech.com/RX-...erOverview.htm
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#9
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Some of this info is good and some is bad. Let me try to explain it in a easy to understand format.
I'm sure you know that before the 2nd turbo comes online its getting prespooled. Its prespooled so that when it comes online your boost doesnt drop a ton then have to build back up. Its already up and running and creating boost so that when the gate opens up its already going. Well during this prespool process the 2nd turbo is creating boost.....well since the boost isnt going into the motor yet it has to go somewhere or else it would just build up and be hard on your turbo. During that prespool period the CRV opens up so the boost can have somewhere to go, which is back into the intake box. When the gate opens and the 2nd turbo comes online the CRV closes so that it doesnt keep leaking it all out.
Hope that helps some
STEPHEN
I'm sure you know that before the 2nd turbo comes online its getting prespooled. Its prespooled so that when it comes online your boost doesnt drop a ton then have to build back up. Its already up and running and creating boost so that when the gate opens up its already going. Well during this prespool process the 2nd turbo is creating boost.....well since the boost isnt going into the motor yet it has to go somewhere or else it would just build up and be hard on your turbo. During that prespool period the CRV opens up so the boost can have somewhere to go, which is back into the intake box. When the gate opens and the 2nd turbo comes online the CRV closes so that it doesnt keep leaking it all out.
Hope that helps some
STEPHEN
#14
don't race, don't need to
put a vacuum hose to the actuator nipple, suck lightly, have your girlfriend blow through the main hose, flow when suck, no flow when no suck, end up in the bathtub with can of whip cream... oops
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